MIR's three largest insider shareholders as of September 09, 2026 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).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Sponsor Ii Llc Gs | TenPercentOwner | 17,793,000 | 0 | 17,793,000 | 42.4% | 06 Jun, 2024 |
| 2 | General Partners (Ix) Ltd Charterhouse | Other | 0 | 14,960,702 | 14,960,702 | 35.6% | 08 Mar, 2023 |
| 3 | Thomas D Logan | Chief Executive Officer | 2,201,313 | 2,551,371 | 4,752,684 | 11.3% | 07 May, 2026 |
| 4 | Brian Schopfer | Chief Financial Officer | 2,199,971 | 0 | 2,199,971 | 5.2% | 02 Sep, 2026 |
| 5 | Michael Freed | Chief Operating Officer | 935,818 | 0 | 935,818 | 2.2% | 22 Oct, 2021 |
| 6 | Loic Eloy | Nuclear Safety President | 316,424 | 0 | 316,424 | 0.8% | 03 Mar, 2026 |
| 7 | Michael J Rossi | Medical Group President | 196,618 | 0 | 196,618 | 0.5% | 03 Nov, 2023 |
| 8 | Steven W. Etzel | Director | 116,838 | 0 | 116,838 | 0.3% | 14 May, 2026 |
| 9 | Emmanuelle Lee | Chief Legal Officer | 82,431 | 32,748 | 115,179 | 0.3% | 02 Apr, 2026 |
| 10 | Jody Markopoulos | Director | 109,824 | 0 | 109,824 | 0.3% | 14 May, 2026 |
| 11 | John W Kuo | Director | 109,509 | 0 | 109,509 | 0.3% | 14 May, 2026 |
| 12 | Kenneth Bockhorst | Director | 105,573 | 0 | 105,573 | 0.3% | 14 May, 2026 |
| 13 | Lawrence D Kingsley | Director | 92,616 | 0 | 92,616 | 0.2% | 30 Jun, 2026 |
| 14 | Robert Cascella | Director | 80,892 | 0 | 80,892 | 0.2% | 14 May, 2026 |
| 15 | Sheila Rege | Director | 59,044 | 0 | 59,044 | 0.1% | 14 May, 2026 |
| 16 | Alison Ulrich | Chief Human Resources Officer | 36,235 | 0 | 36,235 | 0.1% | 02 Apr, 2026 |
| 17 | Christopher A. Moore | Chief Accounting Officer (Pao) | 22,157 | 0 | 22,157 | 0.1% | 08 May, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 30 Jun, 2026 | Lawrence D Kingsley | Director | Acquired A | 1,095 | $17.46 | $19.12K | 72,525 | Direct |
| 13 May, 2026 | Kenneth Bockhorst | Director | Acquired A | 7,383 | $0.00 | $0 | 77,258 | Direct |
| 13 May, 2026 | Jody Markopoulos | Director | Acquired A | 7,383 | $0.00 | $0 | 81,509 | Direct |
| 13 May, 2026 | Robert Cascella | Director | Acquired A | 7,383 | $0.00 | $0 | 60,801 | Direct |
| 13 May, 2026 | John W Kuo | Director | Acquired A | 7,383 | $0.00 | $0 | 80,119 | Direct |
| 13 May, 2026 | Sheila Rege | Director | Acquired A | 7,383 | $0.00 | $0 | 49,877 | Direct |
| 13 May, 2026 | Steven W. Etzel | Director | Acquired A | 7,383 | $0.00 | $0 | 87,448 | Direct |
| 07 May, 2026 | Christopher A. Moore | Chief Accounting Officer (Pao) | Disposed S | 8,400 | $19.64 | $164.98K | 22,157 | Direct |
| 06 May, 2026 | Thomas D Logan | Chief Executive Officer | Disposed G | 311,851 | $0.00 | $0 | 52,209 | Direct |
| 01 Apr, 2026 | Brian Schopfer | Chief Financial Officer | Disposed F | 7,377 | $18.59 | $137.14K | 913,290 | Direct |
| 01 Apr, 2026 | Alison Ulrich | Chief Human Resources Officer | Disposed F | 2,053 | $18.59 | $38.17K | 36,235 | Direct |
| 01 Apr, 2026 | Christopher A. Moore | Chief Accounting Officer (Pao) | Disposed F | 1,903 | $18.59 | $35.38K | 30,557 | Direct |
| 01 Apr, 2026 | Alison Ulrich | Chief Human Resources Officer | Disposed F | 2,053 | $18.59 | $38.17K | 36,235 | Direct |
| 01 Apr, 2026 | Thomas D Logan | Chief Executive Officer | Disposed F | 22,614 | $18.59 | $420.39K | 364,060 | Direct |
| 01 Apr, 2026 | Christopher A. Moore | Chief Accounting Officer (Pao) | Disposed F | 1,903 | $18.59 | $35.38K | 30,557 | Direct |
| 01 Apr, 2026 | Alison Ulrich | Chief Human Resources Officer | Disposed F | 2,053 | $18.59 | $38.17K | 36,235 | Direct |
| 01 Apr, 2026 | Christopher A. Moore | Chief Accounting Officer (Pao) | Disposed F | 1,903 | $18.59 | $35.38K | 30,557 | Direct |
| 01 Apr, 2026 | Brian Schopfer | Chief Financial Officer | Disposed F | 7,377 | $18.59 | $137.14K | 913,290 | Direct |
| 01 Apr, 2026 | Alison Ulrich | Chief Human Resources Officer | Disposed F | 2,053 | $18.59 | $38.17K | 36,235 | Direct |
| 01 Apr, 2026 | Brian Schopfer | Chief Financial Officer | Disposed F | 7,377 | $18.59 | $137.14K | 913,290 | Direct |