Measuring and Controlling Devices, Not Elsewhere Classified - Latest Activist Disclosures

This table shows recent activist investor (Schedule 13D) filings made in this industry. Any investor or hedge fund that makes an investment with the intention of influencing management is considered an activist investor and must file a 13D.

Date Form Target Company Investor Shares Ownership
(Percent)		 Ownership Change
(Percent)
2024-12-31 13D/A QSI / Quantum-Si incorporated Rothberg Jonathan M 19,937,500 100.00 11.11
2024-12-18 13D/A MIR / Mirion Technologies, Inc. GSAM Holdings LLC 5,187,419 2.30 -80.96
2024-11-13 13D/A MIR / Mirion Technologies, Inc. Goldman Sachs Group Inc 12,387,666 5.50 -17.43
2024-11-06 13D/A MIR / Mirion Technologies, Inc. Goldman Sachs Group Inc 15,003,465 6.70 -19.98
2024-09-17 13D/A QSI / Quantum-Si incorporated Rothberg Jonathan M 17,943,750 90.00 0.00
2024-08-22 13D/A OWLT / Owlet, Inc. Eclipse Continuity GP I, LLC 7,567,901 48.90 8.03
2024-08-22 13D/A OWLTW / Owlet, Inc. - Equity Warrant Trilogy Equity Partners, LLC 2,493,225 18.70
2024-08-01 13D/A MIR / Mirion Technologies, Inc. Goldman Sachs Group Inc 18,750,287 8.30 -13.15
2024-06-06 13D/A MIR / Mirion Technologies, Inc. Goldman Sachs Group Inc 21,588,585 9.60 -21.18
2024-04-16 13D/A APM / Aptorum Group Limited Lui Darren 533,575 14.50 18.64
2024-03-13 13D/A BCHT / Birchtech Corp. Alterna Core Capital Assets Fund II, L.P. 9,300,000 9.86 -20.51
2024-03-04 13D/A OWLT / Owlet, Inc. Eclipse Continuity GP I, LLC 7,005,670 48.90 -31.85
2024-03-01 13D/A OWLT / Owlet, Inc. Trilogy Equity Partners, LLC 2,493,225 23.90 -89.84
2024-02-08 13D/A OWLT / Owlet, Inc. Eclipse Continuity GP I, LLC 10,280,063 61.10 -72.21
2023-09-13 13D/A QSI / Quantum-Si incorporated Rothberg Jonathan M 17,943,750 90.00 26.04
2023-07-07 13D/A MIR / Mirion Technologies, Inc. Goldman Sachs Group Inc 27,391,269 12.10
2023-05-24 13D/A APM / Aptorum Group Limited Lui Darren 449,724 17.76 -98.89
2023-05-16 13D/A MIR / Mirion Technologies, Inc. Charterhouse General Partners (IX) Ltd 7,960,702 3.70 -46.79
2023-04-24 13D/A MIR / Mirion Technologies, Inc. GSAM Holdings LLC 27,250,000 12.10 -0.01
2023-03-08 13D/A MIR / Mirion Technologies, Inc. Charterhouse General Partners (IX) Ltd 14,960,702 6.90
2023-02-27 13D OWLT / Owlet, Inc. Workman Kurt 7,473,415 6.30
2023-02-27 13D/A OWLT / Owlet, Inc. Eclipse Continuity GP I, LLC 36,993,856 29.99 29.84
2023-02-23 13D/A OWLT / Owlet, Inc. Trilogy Equity Partners, LLC 24,531,139 18.80
2022-12-07 13D/A MIR / Mirion Technologies, Inc. GSAM Holdings LLC 27,252,700 13.10 -38.10
2022-10-19 13D/A MIR / Mirion Technologies, Inc. GSAM Holdings LLC 44,025,083 21.10 -5.83
2022-09-21 13D/A MIR / Mirion Technologies, Inc. Charterhouse General Partners (IX) Ltd
2022-06-28 13D/A QSI / Quantum-Si incorporated Foresite Capital Fund IV, L.P. 4,424,317 3.70 -47.48
2021-12-30 13D QSI / Quantum-Si incorporated Rothberg Jonathan M 14,236,538 94.56 -20.66
2021-11-04 13D MIR / Mirion Technologies, Inc. Charterhouse General Partners (IX) Ltd 24,746,855 12.70
2021-11-01 13D MIR / Mirion Technologies, Inc. GSAM Holdings LLC 46,750,000 22.50
2021-11-01 13D MIR / Mirion Technologies, Inc. Charterhouse General Partners (IX) Ltd 24,746,855 12.70
2021-07-26 13D OWLT / Owlet, Inc. Eclipse Continuity GP I, LLC 28,492,332 25.30
2021-06-21 13D QSI / Quantum-Si incorporated Foresite Capital Fund IV, L.P. 8,424,317 7.20
2021-06-21 13D QSI / Quantum-Si incorporated Rothberg Jonathan M 17,943,750 90.00
2021-06-14 13D/A QSI / Quantum-Si incorporated Flynn James E 1,400,000 1.69 40.00
2021-06-01 13D/A APM / Aptorum Group Limited Huen Ian Chung Yuen 164,911,855 69.25 0.88
2021-02-22 13D/A QSI / Quantum-Si incorporated Flynn James E 1,000,000 8.40
2020-08-26 13D/A GEOS / Geospace Technologies Corporation Nierenberg Investment Management Company, Inc. 552,765 4.00 -20.95
2020-07-15 13D/A GEOS / Geospace Technologies Corporation Lemelson Capital Management LLC 264 0.00 -99.98
2020-05-27 13D GEOS / Geospace Technologies Corporation Nierenberg Investment Management Company, Inc. 699,240 5.10 0.00
2020-03-10 13D/A APM / Aptorum Group Limited Huen Ian Chung Yuen 163,480,432 70.37 0.67
2020-02-18 13D GEOS / Geospace Technologies Corporation Sansone Capital Management, Llc 594,581 4.40
2019-09-20 13D/A UCLE / US Nuclear Corp. Chiang Richard 868,073 4.00 -8.78
2019-07-11 13D/A APM / Aptorum Group Limited Lui Darren 40,625,479 17.59
2019-05-08 13D/A APM / Aptorum Group Limited Huen Ian Chung Yuen 162,399,298 70.33
2019-05-08 13D/A APM / Aptorum Group Limited Lui Darren 40,625,479 17.59
2019-02-26 13D/A UCLE / US Nuclear Corp. Chiang Richard 951,673 5.60 -17.26
2019-02-08 13D/A GEOS / Geospace Technologies Corporation Nierenberg Investment Management Company, Inc.
2019-01-03 13D APM / Aptorum Group Limited Huen Ian Chung Yuen 181,788,298 78.74
2019-01-03 13D APM / Aptorum Group Limited Lui Darren 45,206,298 19.60