MIR's three largest insider shareholders as of September 29, 2026 are Sponsor Ii Llc Gs (TenPercentOwner, 17.79Mn shares), General Partners (Ix) Ltd Charterhouse (Other, 14.96Mn shares), Lawrence D Kingsley (Director, 3.51Mn 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 |
|---|---|---|---|---|---|---|---|---|
| 02 Sep, 2026 | Brian Schopfer | Chief Financial Officer | Acquired P | 20,000 | $15.60 | $312.00K | 933,290 | Direct |
| 30 Jun, 2026 | Lawrence D Kingsley | Director | Acquired A | 1,095 | $17.46 | $19.12K | 72,525 | Direct |
| 13 May, 2026 | Robert Cascella | Director | Acquired A | 7,383 | $0.00 | $0 | 60,801 | Direct |
| 13 May, 2026 | Lawrence D Kingsley | Director | Acquired A | 7,383 | $0.00 | $0 | 71,430 | Direct |
| 13 May, 2026 | Jody Markopoulos | Director | Acquired A | 7,383 | $0.00 | $0 | 81,509 | Direct |
| 13 May, 2026 | Kenneth Bockhorst | Director | Acquired A | 7,383 | $0.00 | $0 | 77,258 | 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 | 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 | Brian Schopfer | Chief Financial Officer | Disposed F | 7,377 | $18.59 | $137.14K | 913,290 | Direct |
| 31 Mar, 2026 | Lawrence D Kingsley | Director | Acquired A | 1,104 | $17.32 | $19.12K | 64,047 | Direct |
| 01 Apr, 2026 | Emmanuelle Lee | Chief Legal Officer | Disposed F | 4,680 | $18.59 | $87.00K | 82,431 | Direct |
| 01 Mar, 2026 | Thomas D Logan | Chief Executive Officer | Disposed F | 20,650 | $21.61 | $446.25K | 3,289,038 | Direct |
| 01 Mar, 2026 | Christopher A. Moore | Chief Accounting Officer (Pao) | Acquired A | 5,552 | $0.00 | $0 | 33,857 | Direct |
| 01 Mar, 2026 | Alison Ulrich | Chief Human Resources Officer | Acquired A | 5,552 | $0.00 | $0 | 40,648 | Direct |