ELSE / Electro-Sensors, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Electro-Sensors, Inc.
US ˙ NasdaqCM ˙ US2852331022

Mga Batayang Estadistika
CIK 351789
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Electro-Sensors, Inc.
SEC Filings (Chronological Order)
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August 12, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SEC

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 30, 2025 SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 30, 2025 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2024

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2024 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 12, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SE

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 29, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 23, 2025 ELECTRO SENSORS, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 23, 2025 ELECTRO SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 19, 2025 EX-19.1

Electro-Sensors, Inc. Policy Statement on Confidential Information and Securities Trading by Electro-Sensors, Inc. Personnel

Exhibit 19.1 POLICY STATEMENT ON CONFIDENTIAL INFORMATION AND SECURITIES TRADING BY ELECTRO-SENSORS, INC. PERSONNEL (January 2003) SUMMARY Both federal securities laws and the policy of Electro-Sensors, Inc. (“ESI” or the “Company”) prohibit transactions in Company stock at a time when you may be in possession of material information about the Company that has not been publicly disclosed. You are

March 19, 2025 EX-99.1

Letter to Shareholders dated March 19, 2025

Exhibit 99.1 March 19, 2025 Dear Shareholders: Greetings and welcome to the Electro-Sensors 2024 Annual Report. We appreciate your interest and continued support as we carry out our mission of supplying industry-leading machine monitoring sensors and hazard monitoring systems for global agricultural and industrial applications. For over 50 years, our customers have relied on us to guard their mach

March 19, 2025 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at www.virtualshareholdermeeting.com/ELSE2025 on April 23, 2025 at 2:00 p.m. Central time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairman of the Board President, Card

March 19, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.____ )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 19, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

November 13, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 ☐ TRANSITION REPORT PURSUANT T

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SEC

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 31, 2024 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2023

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2023 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 ("Rule"), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 31, 2024 SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 10, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SE

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 29, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): April 24, 2024 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commission F

April 10, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of

March 20, 2024 EX-99.1

Letter to Shareholders dated March 15, 2024

Exhibit 99.1 March 15, 2024 Dear Shareholders: Welcome to the Electro-Sensors 2023 Annual Report. Thanks for your interest in the company and your continued support as we provide the industry’s most reliable and cost-effective machine monitoring sensors and hazard monitoring systems. For over 50 years, agricultural and industrial customers around the world have relied on Electro-Sensors’ products

March 20, 2024 EX-97.1

Compensation Recoupment Policy as adopted on October 18, 2023

Exhibit 97.1 Electro-Sensors, Inc. Compensation Recoupment Policy adopted as of October 18, 2023 1. Restatement. In the event of any required accounting restatement of the financial statements of Electro-Sensors, Inc. (the “Company”) due to the material noncompliance of the Company with any financial reporting requirement under the applicable U.S. federal securities laws, including any required ac

March 20, 2024 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at www.virtualshareholdermeeting.com/ELSE2024 on April 24, 2024 at 2:00 p.m. Central time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairman of the Board President, Card

March 20, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 20, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.____ )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

February 21, 2024 SC 13D/A

ELSE / Electro-Sensors, Inc. / Peterson Lynne Elizabeth - SCHEDULE 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Lynne E. Peterson 10254 Nottingham Trail, Eden Prairie, MN 55347 612-670-7055 (Name, Address and Telephone Number of Person Authorized to Receiv

February 14, 2024 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson Jeffrey Dean - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Jeffrey D. Peterson 6111 Blue Circle Drive, Minnetonka, MN 55343 612-865-0154 (Name, Address and Telephone Number of Person Authorized to Receive

February 14, 2024 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson Patricia Nancy - SCHEDULE 13D Activist Investment

SC 13D 1 petpn20240213sc13d.htm SCHEDULE 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Patricia N. Peterson 6005 Erin Terrace, Edina, MN 55439 612-799-8994 (Name, Address and Telephone Nu

February 14, 2024 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson John Eberhart - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) John E. Peterson 815 Buttonbush Lane, Naples, FL 34108 952-426-8585 (Name, Address and Telephone Number of Person Authorized to Receive Notices a

February 14, 2024 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson Lynne Elizabeth - SCHEDULE 13D Activist Investment

SC 13D 1 petle20240213sc13d.htm SCHEDULE 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Lynne E. Peterson 10254 Nottingham Trail, Eden Prairie, MN 55347 612-670-7055 (Name, Address and Tel

February 14, 2024 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson Paul Rodney - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Paul R. Peterson P.O. Box 901332, Kula, Hawaii 96790 808-214-2199 (Name, Address and Telephone Number of Person Authorized to Receive Notices and

February 5, 2024 SC 13G/A

ELSE / Electro-Sensors, Inc. / CALDWELL SECURITIES, INC - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Electro-Sensors Inc. (Name of Issuer) Common Stock, $0.10 par value per share (Title of Class of Securities) 285233102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rul

November 14, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPORT PURSUANT T

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

November 14, 2023 EX-10.4

Form of Restricted Stock Unit Agreement under the 2013 Equity Incentive Plan - incorporated by reference to Exhibit 10.4 to the Company's Form 10-Q filed on November 14, 2023

EXHIBIT 10.4 [Form of] RESTRICTED STOCK UNIT AGREEMENT ELECTRO-SENSORS, INC. 2013 EQUITY INCENTIVE PLAN THIS AGREEMENT, made effective as of this of , , by and between Electro-Sensors, Inc., a Minnesota corporation (the “Company”), and (“Participant”). WITNESSETH: WHEREAS, Participant on the date hereof is an Employee or Director of the Company or one of its Subsidiaries; and WHEREAS, the Company

November 14, 2023 EX-10.3

Form of Non-qualified Stock Option Agreement under the 2013 Equity Incentive Plan, as updated August 2023 – incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on November 14, 2023

EXHIBIT 10.3 [FORM OF] NONQUALIFIED STOCK OPTION AGREEMENT ELECTRO-SENSORS, INC. 2013 EQUITY INCENTIVE PLAN THIS AGREEMENT, made effective as of this day of , , by and between Electro-Sensors, Inc., a Minnesota corporation (the “Company”), and (“Participant”). WITNESSETH: WHEREAS, Participant on the date hereof is an Employee or Director of the Company or one of its Subsidiaries; and WHEREAS, the

August 10, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SEC

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 31, 2023 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2022

EX-1.01 2 electro230628ex1-01.htm CONFLICT MINERAL REPORT Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2022 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to

May 31, 2023 SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 11, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SE

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): April 27, 2023 Electro-Sensors, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): April 27, 2023 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commission F

March 17, 2023 EX-99.1

Letter to Shareholders dated March 17, 2023

Exhibit 99.1 March 17, 2023 Dear Shareholders: Greetings and welcome to the 2022 Electro-Sensors Annual Report. Spring is once again in the air, and we are eagerly looking forward to this new season. Similarly, Electro-Sensors has gone through an interesting and dynamic season since our last shareholder report. However, as much as we often focus on changing circumstances, we remain steadfastly com

March 17, 2023 EX-4.1

Description of the Registrant's Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Electro-Sensors, Inc. (“ELSE,” “we,” “our,” or “us”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: our common stock. DESCRIPTION OF CAPITAL STOCK The following summary of the general terms and provisions of our

March 17, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.____ )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 17, 2023 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at www.virtualshareholdermeeting.com/ELSE2023 on April 27, 2023 at 2:00 p.m. Central time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairman of the Board President, Card

March 17, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

February 10, 2023 SC 13G

ELSE / Electro-Sensors, Inc. / CALDWELL SECURITIES, INC - SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors Inc. (Name of Issuer) Common Stock, $0.10 par value per share (Title of Class of Securities) 285233102 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule

January 31, 2023 EX-99.1

Electro-Sensors and Mobile X Global, Inc. Agree to Terminate Merger Agreement

Exhibit 99.1 Electro-Sensors and Mobile X Global, Inc. Agree to Terminate Merger Agreement Minnetonka, Minnesota, January 30, 2023; Electro-Sensors, Inc. (Nasdaq: ELSE) and privately held Mobile X Global, Inc. announced today that the two companies have terminated the definitive merger agreement the parties entered into on June 10, 2022. A condition to closing of the merger transaction was the con

January 31, 2023 8-K

Termination of a Material Definitive Agreement, Entry into a Material Definitive Agreement, Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): January 30, 2023 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commission

January 31, 2023 EX-10.1

Mutual Termination Agreement, dated January 30, 2023 between Electro-Sensors, Inc. and Mobile X Global, Inc. - incorporated by reference to Exhibit 10.1 to the Company's Form 8-K filed January 31, 2023

Exhibit 10.1 AGREEMENT TO TERMINATE AGREEMENT AND PLAN OF MERGER by and among ELECTRO-SENSORS, INC., MOBILE X NEWCO, INC., and MOBILE X GLOBAL, INC. January 30, 2023 Reference is hereby made to the Agreement and Plan of Merger (the “Merger Agreement”), dated as of June 10, 2022, by and among Electro-Sensors, Inc., a Minnesota corporation (the “Parent”), Mobile X Newco, Inc., a Delaware corporation

November 14, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPORT PURSUANT T

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

October 7, 2022 SC 13D/A

ELSE / Electro-Sensors, Inc. / Activist Investing LLC - AMENDMENT NO. 1 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 1)1 Electro-Sensors, Inc. (Name of Issuer) Common Stock, $0.10 par value (Title of Class of Securities) 285233102 (CUSIP Number) DAVID E. LAZAR Villa 1, 14

September 26, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): September 20, 2022 Electro-Sensor

425 1 electro221135425.htm 425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): September 20, 2022 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation)

September 26, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): September 20, 2022 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commissi

August 2, 2022 EX-3.2

Electro-Sensors, Inc. Bylaws, as amended June 10, 2022, incorporated by reference to Exhibit 3.2 to the Form 10-Q for the quarter ended June 30, 2022

Exhibit 3.2 Amended Bylaws of Electro-Sensors, Inc. (as of june 10, 2022) ARTICLE 1 Offices and Corporate Seal 1.1 Offices. The principal office of the corporation will be located at 6111 Blue Circle Drive, Minnetonka, Minnesota, and the corporation may have offices at such other places within or without the State of Minnesota as the Board of Directors may from time to time determine or the busine

August 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ☐ TRANSITION REPORT PURSUANT TO SEC

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 2, 2022 EX-3.1

Electro-Sensors, Inc Restated Articles of Incorporation, as amended—incorporated by reference to Exhibit 3.1 to the Company’s Form 10-Q for the quarter ended June 30, 2022

Exhibit 3.1 RESTATED ARTICLES OF INCORPORATION OF ELECTRO-SENSORS, INC. AS OF JUNE 30, 2022 ARTICLE 1 NAME 1.1 The name of the corporation shall be Electro-Sensors, Inc. ARTICLE 2 REGISTERED OFFICE 2.1 The location and post office address of the registered office of the corporation shall be 6111 Blue Circle Drive Minnetonka, Minnesota 55343-9108 ARTICLE 3 PURPOSE 3.1 The corporation shall have gen

June 15, 2022 425

Filed by Electro-Sensors, Inc.

425 1 electro220776425.htm 425 Filed by Electro-Sensors, Inc. Commission File No.: 000-09587 Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Mobile X Global, Inc. Article Fiercewireless.com Mobile X, Electro-Sensors plan merger to disrupt wireless By Monica Alleven Jun

June 14, 2022 EX-10.1

Form of Voting Agreement dated June 10, 2022 among Mobile X Global, Inc, Electro-Sensors, Inc, and officers, directors and shareholders of Electro-Sensors, Inc. named on Schedule I-A

Exhibit 10.1 Execution Version VOTING AGREEMENT This VOTING AGREEMENT (this ?Voting Agreement?) is made and entered into as of June 10, 2022 by and among Mobile X Global Inc., a Delaware corporation (?Mobile X?), the undersigned shareholder (the ?Shareholder?) of Electro-Sensors, Inc., a Minnesota corporation (the ?Parent?) and the Parent. Capitalized terms used but not otherwise defined herein sh

June 14, 2022 EX-99.1

Electro-Sensors and Mobile X Global Announce Merger Public company to launch Mobile X, a disruptive new wireless service provider

Exhibit 99.1 Electro-Sensors and Mobile X Global Announce Merger Public company to launch Mobile X, a disruptive new wireless service provider Minnetonka, MN and Los Angeles, CA ? June 13, 2022: Electro-Sensors, Inc. (Nasdaq: ELSE), a leader in industrial monitoring systems, and Mobile X Global, Inc., one of the world?s first connectivity-as-a-service companies, announced today that they have ente

June 14, 2022 8-K

Entry into a Material Definitive Agreement, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): June 10, 2022 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commission Fi

June 14, 2022 EX-2.1

Agreement and Plan of Merger dated June 10, 2022 between Electro-Sensors, Inc. , Mobile X Newco, Inc., a Delaware corporation and wholly owned subsidiary of Electro-Sensors, Inc, and Mobile X Global, Inc.

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER dated as of June 10, 2022 by and among ELECTRO-SENSORS, INC., MOBILE X NEWCO, INC., and MOBILE X GLOBAL, INC., Table of Contents Page ARTICLE I DEFINED TERMS 2 1.1. Specific Definitions 2 1.2. Other Terms 3 1.3. Interpretation 3 ARTICLE II THE MERGER 4 2.1. The Merger 4 2.2. Effective Time 4 2.3. Effects of the Merger 4 2.4. Organizational Documents of the

June 14, 2022 EX-10.2

Form of Mobile X Voting Agreement dated June 10, 2022 among Mobile X Global, Inc, Electro-Sensors, Inc., and the officers, directors and Shareholders of Mobile X Global, Inc. named on Schedule I-B

Exhibit 10.2 Execution Version VOTING AGREEMENT This VOTING AGREEMENT (this ?Voting Agreement?) is made and entered into as of June 10, 2022 by and among Mobile X Global Inc., a Delaware corporation (?Mobile X?), the undersigned shareholder (the ?Shareholder?) of Mobile X and Electro-Sensors, Inc., a Minnesota corporation (the ?Parent?). Capitalized terms used but not otherwise defined herein shal

June 14, 2022 EX-3.2

Section 3.12 of Electro-Sensors, Inc. Bylaws, effective June 10, 2022

Exhibit 3.2 Article 3 of the Electro-Sensors, Inc., Bylaws, Directors, is hereby amended to add a new Section 3.12, as forth below, effective June 10, 2022 Section 3.12. Exclusive Forum for Internal Corporate Claims. The sole and exclusive forum for (i) any claim that is based upon a violation of a duty under the laws of the State of Minnesota by a current or former director, officer or shareholde

June 13, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): June 10, 2022 Electro-Sensors, In

425 1 electro220768425.htm 425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): June 10, 2022 Electro-Sensors, Inc. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-

May 31, 2022 SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 31, 2022 EX-1.01

Exhibit 1.01 – Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2021 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 13, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SE

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 25, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 20, 2022 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 31, 2022 EX-99.1

Letter to Shareholders dated March 31, 2022

Exhibit 99.1 March 31, 2022 Dear Shareholders: Welcome to the 2021 Electro-Sensors Annual Report. We appreciate your interest in the company as we continue to deliver industry-leading machine monitoring sensors and hazard monitoring systems for global industrial and agricultural applications. For over 50 years, our customers have relied on us to provide innovative and cost-effective solutions, ena

March 31, 2022 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at www.virtualshareholdermeeting.com/ELSE2022 on April 20, 2022 at 2:00 p.m. Central time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairman of the Board President, Card

March 31, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 31, 2022 DEF 14A

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information

DEF 14A 1 electro220424def14a.htm DEF 14A SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as p

January 14, 2022 EX-99.1

Press Release, dated January 14, 2022.

Exhibit 99.1 Activist Investing LLC Announces 5.7% Ownership Interest in Electro-Sensors, Inc. January 14, 2022 (GLOBE NEWSWIRE) NEW YORK ? Activist Investing LLC (together with its affiliates, ?Activist Investing? or ?we?), today announced the acquisition of approximately 5.7% of the outstanding shares of Electro-Sensors, Inc. (NASDAQ: ELSE) (?ELSE? or the ?Company?). David Elliot Lazar, Chief Ex

January 14, 2022 SC 13D

ELSE / Electro-Sensors, Inc. / Activist Investing LLC - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. )1 Electro-Sensors, Inc. (Name of Issuer) Common Stock, $0.10 par value (Title of Class of Securities) 285233102 (CUSIP Number) DAVID E. LAZAR C/O ACTIVIST

January 14, 2022 EX-99.2

JOINT FILING AGREEMENT

Exhibit 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the shares of Common Stock, $0.10 par value, of Electro-Sensors, Inc., a Minnesota corporation. This Jo

November 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITION REPORT PURSUANT T

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 12, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ☐ TRANSITION REPORT PURSUANT TO SEC

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

June 1, 2021 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2020

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2020 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (?Rule?), the instructions to Form SD, and the Securities and Exchange Commission Releas

June 1, 2021 SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter)

SD 1 electro210736sd.htm FORM SD UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343

May 13, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SE

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 27, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 21, 2021 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 25, 2021 EX-3.2

Registrant’s Bylaws, as amended

Exhibit 3.2 Amended Bylaws of Electro-Sensors, Inc. (as of March 23, 2021) ARTICLE 1 Offices and Corporate Seal 1.1 Offices. The principal office of the corporation will be located at 6111 Blue Circle Drive, Minnetonka, Minnesota, and the corporation may have offices at such other places within or without the State of Minnesota as the Board of Directors may from time to time determine or the busin

March 25, 2021 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at www.virtualshareholdermeeting.com/ELSE2021 on April 21, 2021 at 2:00 p.m. Central time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairman of the Board President, Card

March 25, 2021 10-K

Annual Report - FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 25, 2021 EX-99.1

Letter to Shareholders dated March 25, 2021

Exhibit 99.1 March 25, 2021 Dear Shareholders: Welcome to the 2020 Electro-Sensors Annual Report. Thanks for your interest in the company and your continued support as we provide our customers around the world with the industry?s finest machine monitoring sensors and switches, and most innovative hazard monitoring systems. By any measure, 2020 was an extraordinary year due to the COVID-19 pandemic

March 25, 2021 DEF 14A

- DEF 14A

DEF 14A 1 electro210409def14a.htm DEF 14A SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the registrant ☒ Filed by a party other than the registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as p

November 12, 2020 10-Q

Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2020

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 13, 2020 10-Q

Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2020

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

July 27, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): July 22, 2020 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission Fi

June 9, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): June 4, 2020 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission Fil

June 1, 2020 EX-1.01

Exhibit 1.01 – Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2019 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

June 1, 2020 SD

- FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 11, 2020 10-Q

Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2020

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 11, 2020 EX-10.1

Electro-Sensors, Inc. Small Business Administration Payroll Protection Program Loan Agreement for $645,180 dated as of May 5, 2020

Exhibit 10.1 U.S. BANK® SBA PAYROLL PROTECTION LOAN U.S. Bank® SBA Payroll Protection Loan Borrower Note Date: 05/05/2020 Electro-Sensors, Inc. Tax ID Number: 41-0943459 Minnetonka,MN 55343 Loan Amount: $645,180.00 Type of Organization: C-Corp State of Registration: MN-Minnesota 1. Loan ("Loan"). FOR VALUE RECEIVED, the undersigned borrower ("Borrower") promises to pay to the order of U.S. Bank Na

April 28, 2020 DEF 14A

- FORM DEF 14A

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 25, 2020 EX-99.1

Letter to Shareholders dated March 25, 2020

Exhibit 99.1 March 25, 2020 Dear Shareholders: It has certainly been an exciting year for us as we’ve carried out our mission of providing industry leading machine monitoring sensors and hazard monitoring systems to industrial and agricultural customers around the world. While many things have changed in our business over the last 50-plus years, our passion for serving customers has never wavered

March 25, 2020 10-K

Annual Report - FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 25, 2020 EX-4.1

Description of the Registrant's Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934, incorporated by reference to Exhibit 4.1 to the Form 10-K for the year ended December 31, 2019

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Electro-Sensors, Inc. (“ELSE,” “we,” “our,” or “us”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: our common stock. DESCRIPTION OF CAPITAL STOCK The following summary of the general terms and provisions of our

March 25, 2020 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The date and location of our Annual Meeting of Shareholders will be announced at a later date via the proxy statement and on our corporate website (www.electro-sensors.com). All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Ch

November 12, 2019 10-Q

Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2019

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 12, 2019 10-Q

Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2019

S UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 31, 2019 SD

ELSE / Electro-Sensors, Inc. SD - - FORM SD

SD 1 electro191231sd.htm FORM SD UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343

May 31, 2019 EX-1.01

Exhibit 1.01 – Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2018 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 24, 2019 8-K/A

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A AMENDMENT NO. 1 TO CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 24, 2019 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorpo

May 13, 2019 10-Q

ELSE / Electro-Sensors, Inc. 10-Q Quarterly Report FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2019

Sta UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 30, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 24, 2019 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 20, 2019 DEF 14A

ELSE / Electro-Sensors, Inc. FORM DEF 14A

ELECTRO-SENSORS, INC. 6111 Blue Circle Drive Minnetonka, Minnesota 55343 (952) 930-0100 NOTICE OF ANNUAL MEETING OF SHAREHOLDERS To Be Held April 24, 2019 To the Shareholders of Electro-Sensors, Inc.: Notice is hereby given that the Annual Meeting of Shareholders of Electro-Sensors, Inc. will be held at the Sheraton Minneapolis West Hotel, 12201 Ridgedale Drive, Minnetonka, Minnesota, on Wednesday

March 20, 2019 EX-99.1

Letter to Shareholders dated March 20, 2019

Exhibit 99.1 March 20, 2019 Dear Shareholders: In 2018 Electro-Sensors reached an exciting milestone as we celebrated our 50th anniversary of providing industry leading machine monitoring sensors and hazard monitoring systems. As we reflect on the many changes that have taken place as Electro-Sensors has grown into a well-established industry leader in the markets it serves, it is tremendously rew

March 20, 2019 10-K

ELSE / Electro-Sensors, Inc. FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2018 (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 20, 2019 EX-99.2

Investor Information

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 24, 2019 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

November 20, 2018 SC 13D

ELSE / Electro-Sensors, Inc. / Estate Of Nancy P. Peterson - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) Estate of Nancy P. Peterson c/o Jeffrey D. Peterson 15708 Woodknoll Lane Minnetonka, MN 55345 612-865-0154 (Name, Address and Telephone Number of

November 13, 2018 10-Q

ELSE / Electro-Sensors, Inc. FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2018 (Quarterly Report)

Sta UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

August 14, 2018 10-Q

ELSE / Electro-Sensors, Inc. FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2018 (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 30, 2018 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2017

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2017 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 30, 2018 SD

ELSE / Electro-Sensors, Inc. FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 10, 2018 10-Q

ELSE / Electro-Sensors, Inc. FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2018 (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 30, 2018 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 25, 2018 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 20, 2018 DEF 14A

ELSE / Electro-Sensors, Inc. DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 20, 2018 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 25, 2018 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

March 20, 2018 10-K

ELSE / Electro-Sensors, Inc. FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2017 (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 20, 2018 EX-99.1

March 19, 2018

Exhibit 99.1 March 19, 2018 Dear Shareholders: As Electro Sensors approaches our 50th anniversary this summer, we want to thank you for your consistent support and encouragement. Electro-Sensors is a recognized leader in providing machine monitoring sensors and hazard monitoring systems to industrial and agricultural markets. We have grown this reputation steadily by reliably delivering industry-l

November 13, 2017 10-Q

ELSE / Electro-Sensors, Inc. FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2017 (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2017 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

September 11, 2017 SC 13G/A

ELSE / Electro-Sensors, Inc. / JENNINGS MILES P JR - AMENDMENT NO. 1 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) July 27, 2017 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursuant to which this

August 10, 2017 10-Q

ELSE / Electro-Sensors, Inc. FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2017 (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2017 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 31, 2017 SD

Electro-Sensors FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 31, 2017 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2016

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2016 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (?Rule?), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 11, 2017 10-Q

Electro-Sensors FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2017 (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2017 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

May 2, 2017 8-K

Electro-Sensors FORM 8-K DATED APRIL 26, 2017 (Current Report/Significant Event)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 26, 2017 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 29, 2017 DEF 14A

Electro-Sensors DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 29, 2017 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 26, 2017 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

March 29, 2017 10-K

Electro-Sensors FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2016 (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2016 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 29, 2017 EX-99.1

42

Exhibit 99.1 March 10, 2017 Dear Shareholders: I?d like to start by thanking each of you for your continued interest in our company. The year certainly provided many interesting twists and turns, but overall Electro-Sensors maintained a steady course pursuing our strategy to become the leading machine sensing and hazard monitoring provider for the industrial and agricultural markets we serve. For

March 23, 2017 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): March 18, 2017 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

February 23, 2017 SC 13G

ELSE / Electro-Sensors, Inc. / JENNINGS MILES P JR Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.    )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 2 (CUSIP Number) February 23, 2017 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursuant to which th

November 10, 2016 10-Q

ELSE / Electro-Sensors, Inc. 10-Q - Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2016

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2016 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

August 12, 2016 10-Q

ELSE / Electro-Sensors, Inc. 10-Q - Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2016

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2016 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

May 27, 2016 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2015

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2015 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (?Rule?), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 27, 2016 SD

Electro-Sensors FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction (Commission File No.) (I.R.S. Employer of Incorporation) Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 12, 2016 10-Q

ELSE / Electro-Sensors, Inc. 10-Q - Quarterly Report - FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2016

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2016 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 27, 2016 S-8

Electro-Sensors FORM S-8

As filed with the Securities and Exchange Commission on April 27, 2016 Registration No.

April 25, 2016 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 20, 2016 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 14, 2016 EX-99.1

March 7, 2016

EXHIBIT 99.1 March 7, 2016 Dear Shareholders: Greetings and welcome to our 2015 Electro-Sensors Annual Report. The year has certainly flown by and spring is once again in the air. And while the return of the new season is rather predictable, it is likely one of the few things that remained predictable over the past year. On a global scale, the year was characterized by accelerating uncertainty on

March 14, 2016 EX-99.2

INVESTOR INFORMATION

EXHIBIT 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 20, 2016 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

March 14, 2016 10-K

ELSE / Electro-Sensors, Inc. 10-K - Annual Report - FORM 10-K FOR FISCAL YEAR ENDED DECEMBER 31, 2015

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2015 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 14, 2016 DEF 14A

Electro-Sensors, Inc. 2013 Equity Incentive Plan incorporated by reference to Appendix A of the Company’s Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

November 10, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2015 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

August 11, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2015 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2015 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

May 29, 2015 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2014

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2014 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (?Rule?), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 29, 2015 SD

Electro-Sensors FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction of Incorporation) (Commission File No.) (I.R.S. Employer Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 14, 2015 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2015 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2015 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 27, 2015 8-K

Electro-Sensors FORM 8-K DATED APRIL 22, 2015 (Current Report/Significant Event)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 22, 2015 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 18, 2015 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 22, 2015 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

March 18, 2015 EX-99.1

Sincerely, David Klenk

Exhibit 99.1 March 6, 2015 Dear Shareholders: Welcome to the 2014 Electro-Sensors Annual Report. While I realize the year had 365 days like most other years, it sure seems like it went by amazingly fast! Part of the fun of being at Electro-Sensors is that we have many really exciting things taking place and our days are filled with new and interesting opportunities. As highlighted in last year?s a

March 18, 2015 DEF 14A

Electro-Sensors DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 18, 2015 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2014 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

November 12, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2014 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

August 13, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2014 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-9587 ELECTRO-SENSORS, INC.

May 30, 2014 SD

- FORM SD

UNITED STATES SECURITITES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT Electro-Sensors, Inc. (Exact Name of Registrant as Specified in Charter) Minnesota 000-09587 41-0943459 (State or Other Jurisdiction of Incorporation) (Commission File No.) (I.R.S. Employer Identification Number) 6111 Blue Circle Drive Minnetonka, MN 55343-9108 (Address of Principal Execu

May 30, 2014 EX-1.01

ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2013

Exhibit 1.01 ELECTRO-SENSORS, INC. CONFLICT MINERALS REPORT REPORTING YEAR: 2013 NOTE REGARDING DEFINED TERMS Unless otherwise defined in this Conflict Minerals Report, terms used in this Conflict Minerals Report have the meanings ascribed to them by Rule 13p-1 adopted under the Securities Exchange Act of 1934 (“Rule”), the instructions to Form SD, and the Securities and Exchange Commission Releas

May 13, 2014 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

10-Q 1 else14179910q.htm FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2014 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2014 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For

April 25, 2014 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 23, 2014 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 21, 2014 EX-99.1

51

Exhibit 99.1 March 17, 2014 Dear Shareholders: Welcome and thank you for your continued interest in Electro-Sensors. As I write my first annual letter, the temperature has finally risen above freezing and the snow is beginning to melt. By all accounts, it has been a brutal winter, even by Minnesota standards. Outside Electro-Sensors’ windows wild turkeys are once again foraging for the first signs

March 21, 2014 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2013 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 000-09587 ELECTRO-SENSORS, INC.

March 21, 2014 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 23, 2014 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors David L. Klenk President, Electro-Sensors, Inc. Joseph A. Marino Chairm

March 21, 2014 EX-10.4

ASSET PURCHASE AGREEMENT

Exhibit 10.4 CERTAIN INFORMATION INDICATED BY [***] HAS BEEN DELETED FROM THIS EXHIBIT AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT UNDER RULE 24B-2. ASSET PURCHASE AGREEMENT THIS ASSET PURCHASE AGREEMENT (the “Agreement”) is made as of February 14, 2014 by and among HARVEST ENGINEERING INC., a Delaware corporation (“Seller”), HA

March 21, 2014 DEF 14A

- DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 19, 2014 EX-99.1

Electro-Sensors, Inc. Acquires Wireless Hazard Monitoring Product Line From Harvest Engineering Inc.

Exhibit 99.1 Electro-Sensors, Inc. Acquires Wireless Hazard Monitoring Product Line From Harvest Engineering Inc. Minnetonka, MN, February 18, 2014 – Electro-Sensors, Inc. (Nasdaq: ELSE) announced today it has acquired the advanced wireless hazard monitoring product line from Harvest Engineering Inc. (“Harvest”). Electro-Sensors will market and sell the new hazard monitoring products under its new

February 19, 2014 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): February 14, 2014 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commissio

November 21, 2013 8-K

- FORM 8-K DATED NOVEMBER 19, 2013

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): November 19, 2013 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota (State Or Other Jurisdiction Of Incorporation) 000-09587 41-0943459 (Commissio

November 21, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / FARNAM STREET PARTNERS LP /MN - AMENDMENT TO SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5 )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, $.10 par value (Title of Class of Securities) 285233 10 2 (CUSIP Number) Farnam Street Partners, L.P. 3033 Excelsior Boulevard, Suite 320 Minneapolis, MN 55426 Phone: (612) 353-6707 With a copy to: Ma

November 21, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Peterson Nancy P. - AMENDMENT NO.1 TO SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 3 (CUSIP Number) Nancy P. Peterson 805 Main Street Hopkins, MN 55343 612-865-0154 (Name, Address and Telephone Number of Person Authorized to Receive Notices and

November 20, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Swenson Nicholas John - ELECTRO-SENSORS, INC. SCHEDULE 13D 11-19-13 Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 11) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233102 (CUSIP Number) Nicholas J. Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 (Name, Address and Telephon

November 12, 2013 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

10-Q 1 electro13470610q.htm FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2013 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2013 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE A

October 31, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / FARNAM STREET PARTNERS LP /MN - FORM SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4 )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, $.10 par value (Title of Class of Securities) 285233 10 2 (CUSIP Number) Farnam Street Partners, L.P. 3033 Excelsior Boulevard, Suite 320 Minneapolis, MN 55426 Phone: (612) 353-6707 With a copy to: Ma

September 23, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / FARNAM STREET PARTNERS LP /MN - AMENDMENT TO SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, $.10 par value (Title of Class of Securities) 285233 10 2 (CUSIP Number) Farnam Street Partners, L.P. 3033 Excelsior Boulevard, Suite 320 Minneapolis, MN 55426 Phone: (612) 353-6707 With a copy to: Mar

September 12, 2013 EX-99.1

September 9, 2013

Exhibit 99.1 September 9, 2013 Greetings from the Electro-Sensors Team, We hope this letter finds you well and enjoying the remaining months of a delightful summer. At Electro-Sensors, we’ve been busy experiencing a refreshing season of change focused on preparing the Company for the next round of growth and success. As you may have read in our press release dated July 23, 2013, Electro-Sensors re

September 12, 2013 8-K

Financial Statements and Exhibits, Other Events - FORM 8-K DATED SEPTEMBER 12, 2013

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): September 12, 2013 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commissi

August 9, 2013 10-Q

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2013 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

July 23, 2013 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events - FORM 8-K DATED JULY 17, 2013

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): July 17, 2013 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission Fi

July 23, 2013 EX-99.1

July 23, 2013

Exhibit 99.1 July 23, 2013 Electro-Sensors Adds to Management Team and Board of Directors, and Announces Temporary Suspension of Quarterly Dividend · Appoints David L. Klenk as CEO · Adds Scott A. Gabbard to Board of Directors · Temporarily suspends Quarterly Dividend Minnetonka, Minnesota (July 23, 2013) – Electro-Sensors, Inc. (NASDAQ: ELSE), a leading global provider of machine monitoring senso

June 14, 2013 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Other Events - FORM 8-K DATED JUNE 14, 2013

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): June 14, 2013 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission Fi

May 13, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Swenson Nicholas John Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 10) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233102 (CUSIP Number) Nicholas J. Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 (Name, Address and Telephone

May 9, 2013 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2013 ☐ TRANSITION REPORT PURSUANT TO SE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2013 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 000-09587 ELECTRO-SENSORS, INC.

April 29, 2013 EX-10.2

Form of Non-qualified Stock Option Agreement under the 2013 Equity Incentive Plan – incorporated by reference to Exhibit 10.2 to the Company’s Form 8-K filed on April 29, 2013

Exhibit 10.2 [FORM OF] NONQUALIFIED STOCK OPTION AGREEMENT ELECTRO-SENSORS, INC. 2013 EQUITY INCENTIVE PLAN THIS AGREEMENT, made effective as of this day of , 20, by and between Electro-Sensors, Inc., a Minnesota corporation (the “Company”), and (“Participant”). W I T N E S S E T H: WHEREAS, Participant on the date hereof is an Employee or Director of or Consultant to the Company or one of its Sub

April 29, 2013 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 24, 2013 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

April 29, 2013 EX-10.1

Form of Incentive Stock Option Agreement under the 2013 Equity Incentive Plan – incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed on April 29, 2013

Exhibit 10.1 [FORM OF] INCENTIVE STOCK OPTION AGREEMENT ELECTRO-SENSORS, INC. 2013 EQUITY INCENTIVE PLAN THIS AGREEMENT, made effective as of this day of , 20, by and between Electro-Sensors, Inc., a Minnesota corporation (the “Company”), and (“Participant”). W I T N E S S E T H: WHEREAS, Participant on the date hereof is an Employee of the Company or one of its Subsidiaries; and WHEREAS, the Comp

March 22, 2013 EX-4.1

35

EXHIBIT 4.1 35

March 22, 2013 DEF 14A

- DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 22, 2013 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

10-K 1 electro13135010k.htm FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2012 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2012 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF

March 22, 2013 EX-99.2

INVESTOR INFORMATION

EX-99.2 8 electro131350ex99-2.htm INVESTOR INFORMATION EXHIBIT 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 24, 2013 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors Bradley D. Slye

March 22, 2013 EX-99.1

40

EXHIBIT 99.1 March 5, 2013 To the shareholders: Water is one of the most underappreciated natural resources that we have. Listening to our customers and responding to their needs is a core value at Electro-Sensors. We have a reputation for very high reliability products and outstanding customer service. However, for many of our customers last year, we could not provide the one thing they wanted mo

March 22, 2013 EX-10.3

SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2012 FISCAL YEAR

EXHIBIT 10.3 SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2012 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have a written Board compensation plan. For the 2012 fiscal year, the Board determined that each of the Company?s non-employee directors would receive a cash retainer fee of $1,250 per quarter for their services on the Board. 36

March 22, 2013 EX-10.4

SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2012 FISCAL YEAR

EXHIBIT 10.4 SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2012 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have written employment agreements with its executive officers, who serve as ?at-will? employees pursuant to oral arrangements with the Company. For the 2012 fiscal year, the Company?s executive officers were entitled to the base salaries set forth bel

March 15, 2013 EX-2

Nicholas J. Swenson 3033 Excelsior Blvd. Suite 560 Minneapolis, Minnesota 55416 March 14, 2013

Nicholas J. Swenson 3033 Excelsior Blvd. Suite 560 Minneapolis, Minnesota 55416 March 14, 2013 Bradley D. Slye Chairman of the Board Electro-Sensors, Inc. 6111 Blue Circle Drive Minnetonka, Minnesota 55343 Dear Mr. Slye: My admiration for Electro-Sensors has grown since I first acquired shares in 2009, and I have steadily added to my position. Careful study and review of Electro-Sensors continues

March 15, 2013 SC 13D

ELSE / Electro-Sensors, Inc. / Peterson Nancy P. - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Electro-Sensors, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 285233 10 3 (CUSIP Number) Nancy P. Peterson 805 Main Street Hopkins, MN 55343 612-865-0154 (Name, Address and Telephone Number of Person Authorized to Receive Notices and

March 15, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Swenson Nicholas John Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 9) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233102 (CUSIP Number) Nicholas J. Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 (Name, Address and Telephone N

March 15, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Swenson Nicholas John Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 8) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233102 (CUSIP Number) Nicholas J. Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 (Name, Address and Telephone N

March 15, 2013 EX-2

Nicholas J. Swenson 3033 Excelsior Blvd. Suite 560 Minneapolis, Minnesota 55416 March 14, 2013

Nicholas J. Swenson 3033 Excelsior Blvd. Suite 560 Minneapolis, Minnesota 55416 March 14, 2013 Bradley D. Slye Chairman of the Board Electro-Sensors, Inc. 6111 Blue Circle Drive Minnetonka, Minnesota 55343 Dear Mr. Slye: After careful study and review, I have developed a strong admiration and respect for Electro-Sensors, Inc. and its business. I currently own a significant stake in Electro-Sensors

February 15, 2013 SC 13D/A

ELSE / Electro-Sensors, Inc. / Swenson Nicholas John Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 7) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233102 (CUSIP Number) Nicholas J. Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 (Name, Address and Telephone N

November 9, 2012 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2012 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

August 10, 2012 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2012 ☐ TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2012 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

August 8, 2012 EX-24

EX-24

POWER OF ATTORNEY The undersigned hereby constitutes and appoints Bradley D. Slye ("Attorney-in-Fact"), the undersigned's true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for the undersigned and in the undersigned's name, place and stead, in any and all capacities, to sign any or all Forms 3, 4 or Forms 5 relating to beneficial ownership of securities

August 8, 2012 EX-24

EX-24

POWER OF ATTORNEY The undersigned hereby constitutes and appoints Bradley D. Slye ("Attorney-in-Fact"), the undersigned's true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for the undersigned and in the undersigned's name, place and stead, in any and all capacities, to sign any or all Forms 3, 4 or Forms 5 relating to beneficial ownership of securities

May 11, 2012 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2012 ☐ TRANSITION REPORT PURSUANT TO SE

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2012 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

April 20, 2012 8-K

Submission of Matters to a Vote of Security Holders - FORM 8-K DATED APRIL 18, 2012

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 18, 2012 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 29, 2012 EX-99.1

March 8, 2012

Exhibit 99.1 March 8, 2012 To the shareholders: No one likes a car that breaks down except an auto mechanic. We depend on our cars for reliable transportation every day. For our customers, the reliability of our products in their applications is one of the biggest factors in choosing Electro-Sensors? products. The processing plants and installations that our products are used in have long operatin

March 29, 2012 EX-10.3

Summary of Compensation Arrangements with Directors 2011 Fiscal Year

Exhibit 10.3 Summary of Compensation Arrangements with Directors 2011 Fiscal Year Electro-Sensors, Inc. (the ?Company?) currently does not have a written Board compensation plan. For the 2011 fiscal year, the Board determined that each of the Company?s non-employee directors would receive a cash retainer fee of $1,250 per quarter for their services on the Board. 36

March 29, 2012 EX-4.1

Exibit 4.1

Exibit 4.1 35

March 29, 2012 DEF 14A

- DEFINITIVE PROXY STATEMENT

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 29, 2012 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2011 or o TRANSITION REPORT PURSUANT TO SECT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2011 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 0-9587 ELECTRO-SENSORS, INC.

March 29, 2012 EX-10.4

Summary of Compensation Arrangements with Executive Officers 2011 Fiscal Year

Exhibit 10.4 Summary of Compensation Arrangements with Executive Officers 2011 Fiscal Year Electro-Sensors, Inc. (the ?Company?) currently does not have written employment agreements with its executive officers, who serve as ?at-will? employees pursuant to oral arrangements with the Company. For the 2011 fiscal year, the Company?s executive officers were entitled to the base salaries set forth bel

March 29, 2012 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 18, 2012 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors Bradley D. Slye Chairman of the Board President, Electro-Sensors, Inc.

December 9, 2011 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 6 ) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 6 ) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN. 55416 Telephone: (612) 353-6380 With a copy to: Frank Var

November 10, 2011 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2011 o TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2011 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

August 30, 2011 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5 ) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5 ) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN. 55416 Telephone: (612) 353-6380 With a copy to: Frank Var

August 12, 2011 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2011 o TRANSITION REPORT PURSUANT TO SEC

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2011 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

May 18, 2011 EX-24

EX-24

POWER OF ATTORNEY The undersigned hereby constitutes and appoints Bradley D. Slye and Fredrikson & Byron ("Attorneys-in-Fact"), or any one of them acting alone, the undersigned's true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for the undersigned and in the undersigned's name, place and stead, in any and all capacities, to sign any or all Forms 3, For

May 12, 2011 10-Q

Minnesota 41-0943459 6111 Blue Circle Drive Minnetonka, Minnesota 55343-9108 (952) 930-0100

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2011 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

April 25, 2011 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 20, 2011 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

April 5, 2011 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4) (1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 With a copy to: Frank Varga

April 4, 2011 EX-24

POWER OF ATTORNEY

POWER OF ATTORNEY Know all by these presents, that the undersigned, Nicholas Swenson, hereby constitutes and appoints each of Frank Vargas, Dan Tenenbaum and Inchan Hwang, signing singly, the undersigned?s true and lawful attorney-in-fact to: (1) execute for and on behalf of the undersigned a Form ID Application and submit the same to the Securities and Exchange Commission (the ?Commission?); (2) execute for and on behalf of the undersigned, in the undersigned?s capacity as a 10% owner of Electro-Sensors, Inc.

March 17, 2011 EX-10.3

SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2010 FISCAL YEAR

Exhibit 10.3 SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2010 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have a written Board compensation plan. For the 2010 fiscal year, the Board determined that each of the Company?s non-employee directors would receive a cash retainer fee of $1,250 per quarter for their services on the Board.

March 17, 2011 10-K

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2010 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 0-9587 ELECTRO-SENSORS, INC.

March 17, 2011 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 20, 2011 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors Bradley D. Slye Chairman of the Board President, Electro-Sensors, Inc.

March 17, 2011 EX-10.4

SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2010 FISCAL YEAR

Exhibit 10.4 SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2010 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have written employment agreements with its executive officers, who serve as ?at-will? employees pursuant to oral arrangements with the Company. For the 2010 fiscal year, the Company?s executive officers were entitled to the base salaries set forth bel

March 17, 2011 DEF 14A

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information ELECTRO-SENSORS, INC. 6111 Blue Circle Drive Minnetonka, Minnesota 55343 (952) 930-0100 To Be Held April 20, 2011 ELECTRO-SENSORS, INC. 6111 Blue Circle Drive Minnetonka,

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 17, 2011 EX-99.1

March 8, 2011

Exhibit 99.1 March 8, 2011 To the shareholders: Electro-Sensors, Inc. was started by Jim Slattery, the first president of the company. Jim introduced the first product which monitored the level of dry bulk material in storage bins and hoppers. Later on, Pete Peterson joined the company and worked in our investments area and advised in other areas of the company. Both men were instrumental in the d

March 17, 2011 EX-4.1

ELECTRO-SENSORS, INC.

Exhibit 4.1 COMMON COMMON 15986 ELECTRO-SENSORS, INC. INCORPORATED UNDER THE LAWS OF THE STATE OF MINNESOTA See reverse side for certain definitions THIS CERTIFIES THAT CUSIP 285233 10 2 is the owner of FULL-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF THE PAR VALUE OF TEN CENTS EACH OF ELECTRO-SENSORS, INC. transferable only on the books of the corporation by the holder hereof in person

March 16, 2011 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3 )(1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3 )(1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN 55416 Telephone: (612) 353-6380 With a copy to: Frank Varga

February 24, 2011 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): January 26, 2011 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission

November 12, 2010 10-Q

Minnesota 41-0943459 6111 Blue Circle Drive Minnetonka, Minnesota 55343-9108 (952) 930-0100

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2010 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

October 8, 2010 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)(1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) (C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)(1) ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN. 55416 Telephone: (612) 353-6380 With a copy to: Frank Varga

August 13, 2010 10-Q

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2010 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

May 11, 2010 10-Q

Minnesota 41-0943459 6111 Blue Circle Drive Minnetonka, Minnesota 55343-9108 (952) 930-0100

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2010 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

May 6, 2010 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1 )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) (CU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1 )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN. 55416 Telephone: (612) 353-6380 With a copy to: Frank Vargas

April 27, 2010 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): April 21, 2010 ELECTRO-SENSORS, INC. (Exact name of Registrant as Specified in its Charter) Minnesota 000-09587 41-0943459 (State or other jurisdiction of incorporation) (Commission F

March 9, 2010 EX-10.4

SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2009 FISCAL YEAR

EXHIBIT 10.4 SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2009 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have written employment agreements with its executive officers, who serve as ?at-will? employees pursuant to oral arrangements with the Company. For the 2009 fiscal year, the Company?s executive officers were entitled to the base salaries set forth bel

March 9, 2010 10-K

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2009 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 0-9587 ELECTRO-SENSORS, INC.

March 9, 2010 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 21, 2010 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors Bradley D. Slye Chairman of the Board President, Electro-Sensors, Inc.

March 9, 2010 DEF 14A

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information DETACH BELOW AND RETURN USING THE ENVELOPE PROVIDED

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 9, 2010 EX-4.1

ELECTRO-SENSORS, INC.

EXHIBIT 4.1 COMMON COMMON 15986 ELECTRO-SENSORS, INC. INCORPORATED UNDER THE LAWS OF THE STATE OF MINNESOTA See reverse side for certain definitions THIS CERTIFIES THAT CUSIP 285233 10 2 is the owner of FULL-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF THE PAR VALUE OF TEN CENTS EACH OF ELECTRO-SENSORS, INC. transferable only on the books of the corporation by the holder hereof in person

March 9, 2010 EX-99.1

March 3, 2010

Exhibit 99.1 March 3, 2010 To the shareholders: Our business is located in Minnesota and one thing about living in Minnesota is that the winter weather causes potholes to occur on many of our roads. Depending on the size of the pothole, when you hit one with your car, it can be a slight bump or it can be a jarring hit that forces you to take your vehicle in to a repair shop. These potholes are ana

March 9, 2010 EX-10.3

SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2009 FISCAL YEAR

EXHIBIT 10.3 SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2009 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have a written Board compensation plan. For the 2009 fiscal year, the Board determined that each of the Company?s non-employee directors would receive a cash retainer fee of $1,250 per quarter for their services on the Board. 38

December 4, 2009 SC 13D

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) (CUSI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* ELECTRO-SENSORS, INC. (Name of Issuer) Common Stock, par value $0.10 (Title of Class of Securities) 285233 10 2 (CUSIP Number) Nicholas Swenson 3033 Excelsior Blvd., Suite 560 Minneapolis, MN. 55416 Telephone: (612) 353-6380 With a copy to: Frank Vargas,

November 12, 2009 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2009 o TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2009 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

August 12, 2009 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2009 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

May 15, 2009 10-Q

UNITED STATES

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2009 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-9587 ELECTRO-SENSORS, INC.

March 23, 2009 EX-10.3

SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2008 FISCAL YEAR

Exhibit 10.3 SUMMARY OF COMPENSATION ARRANGEMENTS WITH DIRECTORS 2008 FISCAL YEAR Electro-Sensors, Inc. (the ?Company?) currently does not have a written Board compensation plan. For the 2008 fiscal year, the Board determined that each of the Company?s non-employee directors would receive a cash retainer fee of $1,250 per quarter for their services on the Board.

March 23, 2009 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2008 o TRANSITION REPORT PURSUANT TO SECTION

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2008 o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 0-9587 ELECTRO-SENSORS, INC.

March 23, 2009 EX-99.1

March 4, 2009

Exhibit 99.1 March 4, 2009 To the shareholders: The economic climate and business climate that we are in today is much different than even one year ago. The word I use to describe how our economy got to this point is ?artificial?. Loans were made to people with artificial credit ratings. Terms of payment were artificially low for a period of time. Investors gave money to managers that yielded arti

March 23, 2009 EX-10.4

SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2008 FISCAL YEAR

EX-10.4 4 electro091283ex10-4.htm SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS Exhibit 10.4 SUMMARY OF COMPENSATION ARRANGEMENTS WITH EXECUTIVE OFFICERS 2008 FISCAL YEAR Electro-Sensors, Inc. (the “Company”) currently does not have written employment agreements with its executive officers, who serve as “at-will” employees pursuant to oral arrangements with the Company. For the 2008

March 23, 2009 EX-99.2

INVESTOR INFORMATION

Exhibit 99.2 INVESTOR INFORMATION Annual Meeting The Annual Meeting of Shareholders will be held at the Sheraton Minneapolis West, 12201 Ridgedale Drive, Minnetonka, Minnesota on April 22, 2009 at 2:00 p.m. local time. All shareholders are welcome to attend and take part in the discussion of Company affairs. Board of Directors Bradley D. Slye Chairman of the Board President, Electro-Sensors, Inc.

March 23, 2009 DEF 14A

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information

SCHEDULE 14A - INFORMATION REQUIRED IN PROXY STATEMENT Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

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