SEC Form 4 · Updated Daily
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Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| MITSUI SUMITOMO INSURANCE CO LTD | 10%+ Owner | 58,780,450 | 2026-03-03 | P |
| MS&AD Insurance Group Holdings, Inc. | 10%+ Owner | 58,780,450 | 2026-03-03 | P |
| BERKLEY WILLIAM R | 10%+ Owner · Director · Officer | 17,366,375 | 2026-06-03 | A |
| BERKLEY WILLIAM R JR | Director · Officer | 4,654,453 | 2026-08-03 | A |
| SHIEL JAMES G | Officer | 811,283 | 2026-08-03 | A |
| BALLARD EUGENE G | Officer | 251,656 | 2017-08-07 | F |
| Sgaglione Lucille T | Officer | 241,753 | 2025-08-15 | A |
| LEDERMAN IRA S | Officer | 240,031 | 2019-12-11 | G |
| Baio Richard Mark | Officer | 228,261 | 2026-08-03 | A |
| COLE ROBERT P | Officer | 217,669 | 2010-03-02 | A |
| Welt Philip S | Officer | 214,625 | 2026-08-03 | A |
| NUSBAUM JACK H | Director | 149,799 | 2020-06-12 | A |
| PATAFIO CLEMENT P | Officer | 126,883 | 2012-12-17 | P |
| BLAYLOCK RONALD E | Director | 121,990 | 2026-06-03 | A |
| Augostini Christopher L | Director | 109,859 | 2026-06-03 | A |
| HANCOCK PAUL J | Officer | 103,062 | 2010-03-02 | M |
| HEWITT ROBERT C | Officer | 85,000 | 2010-03-02 | A |
| Stone Robert Daly | Officer | 76,698 | 2010-03-02 | A |
| Ferre Maria Luisa | Director | 59,234 | 2026-06-03 | A |
| Madsen Carl Fred | Officer | 50,500 | 2010-03-02 | A |
| GOSSELINK ROBERT W | Officer | 50,000 | 2010-03-02 | A |
| Taylor Steven William | Officer | 41,000 | 2010-03-02 | A |
| DALY GEORGE G | Director | 40,822 | 2016-11-21 | G |
| LaPunzina Carol Josephine | Officer | 34,813 | 2010-03-02 | A |
| Talisman Jonathan | Director | 33,180 | 2026-06-03 | A |
| Kamford Peter Lind | Officer | 31,419 | 2008-06-17 | A |
| HAWES RODNEY A JR | Director | 20,500 | 2011-05-17 | A |
| Farrell Mary C | Director | 19,378 | 2026-06-03 | A |
| Pusey Leigh Ann | Officer | 15,761 | 2021-12-01 | M |
| RICCIARDI MATTHEW M | Officer | 15,561 | 2018-05-15 | F |
| Hafter Jeffrey Marc | Officer | 15,000 | 2010-05-03 | A |
| Mosley Daniel Lynn | Director | 14,885 | 2026-06-03 | A |
| ABLOVE PHILIP J | Director | 11,739 | 2008-05-28 | A |
| James Gillian B | Officer | 10,000 | 2009-12-03 | A |
| Mattson Marie Angela | Director | 9,667 | 2026-06-03 | A |
| Ebers Kevin H | Officer | 8,197 | 2010-05-18 | I |
| BROCKBANK MARK ELLWOOD | Director | 6,000 | 2022-08-01 | P |
| Rusbuldt Robert Alan | Director | 5,866 | 2026-06-03 | A |
| SHAPIRO MARK L | Director | 2,534 | 2024-06-12 | A |
| Carrier Andrew | Director | 0 | 2026-06-03 | — |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-03 | SHIEL JAMES G | Tax withholding | 650 | $72.29 | 810,633 |
| 2026-08-03 | SHIEL JAMES G | Grant / award | 14,086 | $0.00 | 811,283 |
| 2026-08-03 | BERKLEY WILLIAM R JR | Tax withholding | 4,139 | $72.29 | 4,650,314 |
| 2026-08-03 | BERKLEY WILLIAM R JR | Grant / award | 98,593 | $0.00 | 4,654,453 |
| 2026-08-03 | Baio Richard Mark | Tax withholding | 650 | $72.29 | 227,611 |
| 2026-08-03 | Baio Richard Mark | Grant / award | 14,086 | $0.00 | 228,261 |
| 2026-08-03 | Welt Philip S | Tax withholding | 592 | $72.29 | 214,033 |
| 2026-08-03 | Welt Philip S | Grant / award | 14,086 | $0.00 | 214,625 |
| 2026-06-03 | Carrier Andrew | — | — | — | 0 |
| 2026-06-03 | Talisman Jonathan | Grant / award | 3,090 | $0.00 | 33,180 |
| 2026-06-03 | BLAYLOCK RONALD E | Grant / award | 3,090 | $0.00 | 121,990 |
| 2026-06-03 | Augostini Christopher L | Grant / award | 3,090 | $0.00 | 109,859 |
| 2026-06-03 | Rusbuldt Robert Alan | Grant / award | 3,090 | $0.00 | 5,866 |
| 2026-06-03 | Farrell Mary C | Grant / award | 3,090 | $0.00 | 19,378 |
| 2026-06-03 | Mosley Daniel Lynn | Grant / award | 3,090 | $0.00 | 14,885 |
| 2026-06-03 | BERKLEY WILLIAM R JR | Grant / award | 3,090 | $0.00 | 4,555,860 |
| 2026-06-03 | Mattson Marie Angela | Grant / award | 3,090 | $0.00 | 9,667 |
| 2026-06-03 | Ferre Maria Luisa | Grant / award | 3,090 | $0.00 | 59,234 |
| 2026-06-03 | BERKLEY WILLIAM R | Grant / award | 3,090 | $0.00 | 17,366,375 |
| 2026-03-03 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 73,185 | $72.52 | 58,780,450 |
| 2026-03-03 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 38,991 | $71.60 | 58,707,265 |
| 2026-03-03 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 73,185 | $72.52 | 58,780,450 |
| 2026-03-03 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 38,991 | $71.60 | 58,707,265 |
| 2026-03-02 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 100,897 | $73.20 | 58,668,274 |
| 2026-03-02 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 45,103 | $72.29 | 58,567,377 |
| 2026-03-02 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 100,897 | $73.20 | 58,668,274 |
| 2026-03-02 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 45,103 | $72.29 | 58,567,377 |
| 2026-02-27 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 147,000 | $71.63 | 58,522,274 |
| 2026-02-27 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 147,000 | $71.63 | 58,522,274 |
| 2026-02-26 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 7,509 | $72.11 | 58,375,274 |
| 2026-02-26 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 145,491 | $71.65 | 58,367,765 |
| 2026-02-26 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 7,509 | $72.11 | 58,375,274 |
| 2026-02-26 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 145,491 | $71.65 | 58,367,765 |
| 2026-02-25 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 14,356 | $71.77 | 58,222,274 |
| 2026-02-25 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 154,512 | $71.39 | 58,207,918 |
| 2026-02-25 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 14,356 | $71.77 | 58,222,274 |
| 2026-02-25 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 154,512 | $71.39 | 58,207,918 |
| 2026-02-24 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 61,594 | $71.28 | 58,053,406 |
| 2026-02-24 | MS&AD Insurance Group Holdings, Inc. | Open-market buy | 103,192 | $70.52 | 57,991,812 |
| 2026-02-24 | MITSUI SUMITOMO INSURANCE CO LTD | Open-market buy | 61,594 | $71.28 | 58,053,406 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.