As of April 22, 2026, the three largest insider holders of MIR are Sponsor Ii Llc Gs (TenPercentOwner, 17.79Mn shares), Sponsor Ii Llc Gs (TenPercentOwner, 17.79Mn shares), Sponsor Ii Llc Gs (TenPercentOwner, 17.79Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Sponsor Ii Llc Gs | - | 17,793,000 | 0 | 06 Jun, 2024 |
| Sponsor Ii Llc Gs | - | 17,793,000 | 0 | 06 Jun, 2024 |
| Sponsor Ii Llc Gs | - | 17,793,000 | 0 | 06 Jun, 2024 |
| General Partners (Ix) Ltd Charterhouse | - | 0 | 14,960,702 | 08 Mar, 2023 |
| Lawrence D Kingsley | - | 0 | 3,509,075 | 12 Dec, 2025 |
| Thomas D Logan | Chief Executive Officer | 0 | 2,551,371 | 28 Oct, 2024 |
| Thomas D Logan | Chief Executive Officer | 2,149,104 | 0 | 05 Apr, 2022 |
| Michael Freed | Chief Operating Officer | 935,818 | 0 | 22 Oct, 2021 |
| Brian Schopfer | Chief Financial Officer | 913,290 | 0 | 02 Apr, 2026 |
| Brian Schopfer | Chief Financial Officer | 866,746 | 0 | 05 Apr, 2022 |
| Thomas D Logan | Chief Executive Officer | 0 | 865,461 | 22 Oct, 2021 |
| Brian Schopfer | Chief Financial Officer | 399,935 | 0 | 10 Nov, 2025 |
| Thomas D Logan | Chief Executive Officer | 364,060 | 0 | 02 Apr, 2026 |
| Lawrence D Kingsley | - | 0 | 350,000 | 22 Oct, 2021 |
| Loic Eloy | Industrial Group President | 203,077 | 0 | 05 Apr, 2022 |
| Michael J Rossi | Medical Group President | 116,173 | 0 | 03 Nov, 2023 |
| Loic Eloy | Nuclear Safety President | 113,347 | 0 | 03 Mar, 2026 |
| Emmanuelle Lee | Chief Legal Officer | 82,431 | 0 | 02 Apr, 2026 |
| Michael J Rossi | Medical Group President | 80,445 | 0 | 03 Nov, 2022 |
| Steven W. Etzel | - | 80,065 | 0 | 16 May, 2025 |
| Jody Markopoulos | - | 74,126 | 0 | 01 Jul, 2025 |
| John W Kuo | - | 72,736 | 0 | 12 Dec, 2025 |
| Kenneth Bockhorst | - | 69,875 | 0 | 12 Dec, 2025 |
| Lawrence D Kingsley | - | 64,047 | 0 | 02 Apr, 2026 |
| Robert Cascella | - | 53,418 | 0 | 16 May, 2025 |
| Sheila Rege | - | 42,494 | 0 | 16 May, 2025 |
| Alison Ulrich | Chief Human Resources Officer | 36,235 | 0 | 02 Apr, 2026 |
| Emmanuelle Lee | Chief Legal Officer | 0 | 32,748 | 04 Nov, 2024 |
| Christopher A. Moore | Chief Accounting Officer (Pao) | 30,557 | 0 | 02 Apr, 2026 |
| Steven W. Etzel | - | 29,390 | 0 | 30 Sep, 2022 |
| John W Kuo | - | 29,390 | 0 | 30 Sep, 2022 |
| Kenneth Bockhorst | - | 28,315 | 0 | 30 Sep, 2022 |
| Jody Markopoulos | - | 28,315 | 0 | 30 Sep, 2022 |
| Lawrence D Kingsley | - | 20,091 | 0 | 17 Jun, 2022 |
| Robert Cascella | - | 20,091 | 0 | 17 Jun, 2022 |
| Sheila Rege | - | 9,167 | 0 | 20 Sep, 2022 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Apr, 2026 | Christopher A. Moore | Class A Common Stock | D | 1,903 | $18.59 | 30,557 | D | F |
| 01 Apr, 2026 | Thomas D Logan | Class A Common Stock | D | 22,614 | $18.59 | 364,060 | D | F |
| 01 Apr, 2026 | Alison Ulrich | Class A Common Stock | D | 2,053 | $18.59 | 36,235 | D | F |
| 31 Mar, 2026 | Lawrence D Kingsley | Class A Common Stock | A | 1,104 | $17.32 | 64,047 | D | A |
| 01 Apr, 2026 | Emmanuelle Lee | Class A Common Stock | D | 4,680 | $18.59 | 82,431 | D | F |
| 01 Apr, 2026 | Brian Schopfer | Class A Common Stock | D | 7,377 | $18.59 | 913,290 | D | F |
| 01 Mar, 2026 | Christopher A. Moore | Class A Common Stock | A | 5,552 | $0.00 | 33,857 | D | A |
| 01 Mar, 2026 | Brian Schopfer | Class A Common Stock | D | 9,172 | $21.61 | 884,260 | D | F |
| 01 Mar, 2026 | Thomas D Logan | Class A Common Stock | D | 20,650 | $21.61 | 3,289,038 | D | F |
| 01 Mar, 2026 | Alison Ulrich | Class A Common Stock | A | 5,552 | $0.00 | 40,648 | D | A |
| 01 Mar, 2026 | Emmanuelle Lee | Class A Common Stock | A | 11,568 | $0.00 | 90,295 | D | A |
| 02 Mar, 2026 | Loic Eloy | Class A Common Stock | A | 15,577 | $0.00 | 113,347 | D | A |
| 02 Mar, 2026 | Thomas D Logan | Class A Common Stock | A | 318,632 | $0.00 | 3,607,670 | D | A |
| 01 Mar, 2026 | Alison Ulrich | Class A Common Stock | D | 2,360 | $21.61 | 38,288 | D | F |
| 01 Mar, 2026 | Emmanuelle Lee | Class A Common Stock | D | 3,184 | $21.61 | 87,111 | D | F |
| 01 Mar, 2026 | Christopher A. Moore | Class A Common Stock | D | 1,397 | $21.61 | 32,460 | D | F |
| 02 Mar, 2026 | Brian Schopfer | Class A Common Stock | A | 64,906 | $0.00 | 949,166 | D | A |
| 02 Mar, 2026 | Thomas D Logan | Class A Common Stock | D | 127,184 | $21.61 | 3,480,486 | D | F |
| 02 Mar, 2026 | Brian Schopfer | Class A Common Stock | D | 28,499 | $21.61 | 920,667 | D | F |
| 02 Mar, 2026 | Thomas D Logan | Class A Common Stock | D | 3,093,812 | $0.00 | 386,674 | D | G |