Arch Capital Group Ltd.
ent_019de1a246af394fb7a24646dc6a36eb
Disclosures
0
— · 0 jurisdictions
Multi-filing incidents
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no multi-filing incident in sample
Max affected reported
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no filed count in sample
Leak-site claims
0
none in sample
Identity resolution
- Canonical name
- Arch Capital Group Ltd.
- Normalized
- arch capital— dedupe via name-norm; Microsoft / MSFT collapse to one row
- GLEIF LEI
- 549300AYR4P8AFKDCE43
- SEC EDGAR CIK
- 0000947484
- Domain
- archgroup.com
Disclosure history (0)newest first
No disclosures linked to this entity yet.
Subsidiary disclosures (3)filed by group companies
◈ These filings were made by or about subsidiaries of Arch Capital Group Ltd. — not by Arch Capital Group Ltd. itself. Corporate relationships are mapped from GLEIF relationship records and SEC Exhibit 21 filings.
- Massachusetts State AGvia Arch Underwriters Inc.2026-09-01
Arch Underwriters Inc. notified Massachusetts residents of unauthorized access to their personal information. The company became aware of suspicious activity on July 1, 2026, and determined that an unauthorized actor accessed files between June 30 and July 1, 2026. The incident involved potential exposure of personal information. The company engaged cybersecurity experts, terminated access, reported to law enforcement, and is offering 12 months of identity theft protection.
- South Carolina State AGvia Arch Insurance Company2021-08-17
Arthur J. Gallagher & Co. reported a ransomware incident detected on September 26, 2020, affecting systems accessed between June 3 and September 26, 2020. The breach impacted PII including government IDs. Gallagher engaged forensic specialists, took systems offline, and provided 24 months of credit monitoring. No specific victim count was disclosed in this notice.
- Massachusetts State AGvia McNeil & Company, Inc.2019-08-16
McNeil & Company Inc. reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2019-08-16. 5 Massachusetts residents were affected. The report records the breach type as electronic.