The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 11, 2026 | Pasquesi John M | Director | Gift(G) | 1.0M | — | $0 |
| Jun 11, 2026 | Pasquesi John M | Director | Gift(G) | 1.0M | — | $0 |
| Jun 3, 2026 | Posner Brian S | Director | Sell(S) | 3K | $19.66 | $59K |
| May 11, 2026 | Posner Brian S | Director | Sell(S) | 2K | $17.14 | $34K |
| May 5, 2026 | Moczarski Alexander S | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Goodman Laurie | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Houston Daniel Joseph | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Houston Daniel Joseph | Director | Grant(A) | 1K | — | — |
| May 5, 2026 | Kilcoyne Moira A. | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Kilcoyne Moira A. | Director | Grant(A) | 1K | — | — |
| May 5, 2026 | Ebong Francis | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Triplett Neal F | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Triplett Neal F | Director | Grant(A) | 1K | — | — |
| May 5, 2026 | Bunce John L JR | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Bunce John L JR | Director | Grant(A) | 1K | — | — |
| May 5, 2026 | Pasquesi John M | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Pasquesi John M | Director | Grant(A) | 1K | — | — |
| May 5, 2026 | Pasquesi John M | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Posner Brian S | Director | Grant(A) | 2K | — | — |
| May 5, 2026 | Mallesch Eileen A | Director | Grant(A) | 2K | — | — |
| Apr 30, 2026 | Houston Daniel Joseph | Director | Buy(P) | 5K | $94.09 | $499K |
| Mar 11, 2026 | Posner Brian S | Director | Sell(S) | 3K | $17.12 | $51K |
| Mar 10, 2026 | Papadopoulo Nicolas | CEO, Director | Option exercise(M) | 22K | $18.90 | $414K |
| Mar 10, 2026 | Papadopoulo Nicolas | CEO, Director | Sell(S) | 22K | $96.31 | $2.1M |
| Mar 10, 2026 | Papadopoulo Nicolas | CEO, Director | Option exercise(M) | 22K | — | $0 |
| Mar 10, 2026 | Gansberg David | President, Arch Capital Group | Option exercise(M) | 11K | $18.90 | $204K |
| Mar 10, 2026 | Gansberg David | President, Arch Capital Group | Sell(S) | 6K | $96.37 | $569K |
| Mar 10, 2026 | Gansberg David | President, Arch Capital Group | Option exercise(M) | 11K | — | $0 |
| Mar 4, 2026 | Petrillo Louis T | Officer of Subsidiary | Tax withholding(F) | 8K | $98.42 | $790K |
| Mar 4, 2026 | Rajeh Maamoun | President, Arch Capital Group | Gift(G) | 41K | — | $0 |
| Mar 4, 2026 | Rajeh Maamoun | President, Arch Capital Group | Gift(G) | 41K | — | $0 |
| Mar 4, 2026 | Gansberg David | President, Arch Capital Group | Tax withholding(F) | 13K | $98.42 | $1.2M |
| Mar 3, 2026 | Petrillo Louis T | Officer of Subsidiary | Grant(A) | 3K | — | $0 |
| Mar 3, 2026 | Petrillo Louis T | Officer of Subsidiary | Grant(A) | 10K | — | $0 |
| Mar 3, 2026 | Papadopoulo Nicolas | CEO, Director | Grant(A) | 21K | — | $0 |
| Mar 3, 2026 | Papadopoulo Nicolas | CEO, Director | Grant(A) | 76K | — | $0 |
| Mar 3, 2026 | Rajeh Maamoun | President, Arch Capital Group | Grant(A) | 7K | — | $0 |
| Mar 3, 2026 | Rajeh Maamoun | President, Arch Capital Group | Grant(A) | 24K | — | $0 |
| Mar 3, 2026 | Morin Francois | CFO and Treasurer | Grant(A) | 5K | — | $0 |
| Mar 3, 2026 | Morin Francois | CFO and Treasurer | Grant(A) | 19K | — | $0 |
| Mar 3, 2026 | Gansberg David | President, Arch Capital Group | Grant(A) | 7K | — | $0 |
| Mar 3, 2026 | Gansberg David | President, Arch Capital Group | Grant(A) | 24K | — | $0 |
| Mar 3, 2026 | Todd Christine | Chief Investment Officer | Grant(A) | 4K | — | $0 |
| Mar 3, 2026 | Todd Christine | Chief Investment Officer | Grant(A) | 14K | — | $0 |
| Mar 3, 2026 | Todd Christine | Chief Investment Officer | Grant(A) | 6K | — | $0 |
| Feb 27, 2026 | Petrillo Louis T | Officer of Subsidiary | Tax withholding(F) | 312 | $100.15 | $31K |
| Feb 27, 2026 | Gansberg David | President, Arch Capital Group | Tax withholding(F) | 553 | $100.15 | $55K |
| Feb 24, 2026 | Petrillo Louis T | Officer of Subsidiary | Grant(A) | 17K | — | $0 |
| Feb 24, 2026 | Petrillo Louis T | Officer of Subsidiary | Tax withholding(F) | 412 | $99.18 | $41K |
| Feb 24, 2026 | Papadopoulo Nicolas | CEO, Director | Grant(A) | 47K | — | $0 |
| Feb 24, 2026 | Rajeh Maamoun | President, Arch Capital Group | Grant(A) | 29K | — | $0 |
| Feb 24, 2026 | Morin Francois | CFO and Treasurer | Grant(A) | 27K | — | $0 |
| Feb 24, 2026 | Gansberg David | President, Arch Capital Group | Tax withholding(F) | 509 | $99.18 | $50K |
| Feb 24, 2026 | Gansberg David | President, Arch Capital Group | Grant(A) | 29K | — | $0 |
| Feb 24, 2026 | Todd Christine | Chief Investment Officer | Grant(A) | 25K | — | $0 |
| Feb 11, 2026 | Rajeh Maamoun | President, Arch Capital Group | Option exercise(M) | 16K | $27.09 | $432K |
| Feb 11, 2026 | Rajeh Maamoun | President, Arch Capital Group | Sell(S) | 47K | $96.12 | $4.6M |
| Feb 11, 2026 | Rajeh Maamoun | President, Arch Capital Group | Option exercise(M) | 32K | $27.13 | $855K |
| Feb 11, 2026 | Rajeh Maamoun | President, Arch Capital Group | Option exercise(M) | 32K | — | $0 |
| Feb 11, 2026 | Rajeh Maamoun | President, Arch Capital Group | Option exercise(M) | 16K | — | $0 |
| Dec 15, 2025 | Pasquesi John M | Director | Sell(S) | 9K | $94.17 | $829K |
| Dec 12, 2025 | Pasquesi John M | Director | Sell(S) | 29K | $93.81 | $2.7M |
| Dec 12, 2025 | Pasquesi John M | Director | Sell(S) | 175K | $93.91 | $16.4M |
| Dec 12, 2025 | Pasquesi John M | Director | Gift(G) | 53K | — | $0 |
| Dec 10, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Gift(G) | 42 | — | $0 |
| Dec 10, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Gift(G) | 14 | — | $0 |
| Nov 28, 2025 | Morin Francois | EVP AND CFO | Sell(S) | 8K | $94.62 | $757K |
| Nov 19, 2025 | Gansberg David | President, Arch Capital Group | Tax withholding(F) | 9K | $91.17 | $866K |
| Oct 30, 2025 | Vollaro John D | Director | Gift(G) | 877 | — | $0 |
| Oct 30, 2025 | Vollaro John D | Director | Gift(G) | 438 | — | $0 |
| Oct 30, 2025 | Vollaro John D | Director | Gift(G) | 877 | — | $0 |
| Aug 22, 2025 | Rajeh Maamoun | PRESIDENT, ARCH CAPITAL GROUP | Sell(S) | 10K | $94.15 | $942K |
| Aug 5, 2025 | Vollaro John D | Director | Gift(G) | 172K | — | $0 |
| Aug 5, 2025 | Vollaro John D | Director | Gift(G) | 195K | — | $0 |
| Aug 5, 2025 | Vollaro John D | Director | Gift(G) | 23K | — | $0 |
| Aug 1, 2025 | Posner Brian S | Director | Buy(P) | 1K | $17.34 | $17K |
| May 16, 2025 | Morin Francois | EVP AND CFO | Option exercise(M) | 13K | $18.90 | $239K |
| May 16, 2025 | Morin Francois | EVP AND CFO | Sell(S) | 13K | $94.58 | $1.2M |
| May 16, 2025 | Morin Francois | EVP AND CFO | Option exercise(M) | 13K | — | $0 |
| May 13, 2025 | Pasquesi John M | Director | Sell(S) | 24K | $94.72 | $2.3M |
| May 12, 2025 | Pasquesi John M | Director | Sell(S) | 75K | $94.01 | $7.1M |
| May 9, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Sell(S) | 17K | $94.53 | $1.6M |
| May 9, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Gift(G) | 10 | — | $0 |
| May 9, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Option exercise(M) | 17K | $18.90 | $315K |
| May 9, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Gift(G) | 10 | — | $0 |
| May 9, 2025 | Petrillo Louis T | OFFICER OF SUBSIDIARY | Option exercise(M) | 17K | — | $0 |
| May 7, 2025 | Bunce John L JR | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Bunce John L JR | Director | Grant(A) | 1K | — | — |
| May 7, 2025 | Ebong Francis | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Houston Daniel Joseph | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Houston Daniel Joseph | Director | Grant(A) | 1K | — | — |
| May 7, 2025 | Kilcoyne Moira A. | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Kilcoyne Moira A. | Director | Grant(A) | 1K | — | — |
| May 7, 2025 | Mallesch Eileen A | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Moczarski Alexander S | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Pasquesi John M | Director | Grant(A) | 1K | — | — |
| May 7, 2025 | Pasquesi John M | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Pasquesi John M | Director | Grant(A) | 1K | — | — |
| May 7, 2025 | Posner Brian S | Director | Grant(A) | 2K | — | — |
| May 7, 2025 | Triplett Neal F | Director | Grant(A) | 2K | — | — |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2021-01-04 → 2026-07-21. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).