norm: arch underwritersUSLEI 549300PSZSTQ5N1HYK08 · no CIKMax severity: Low↳ subsidiary of Arch Capital Group Ltd.

Canonical registry

Arch Underwriters Inc.

ent_01a0f8869f1e60af4144526ab681a3f9

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Disclosures

1

State AG · 1 jurisdiction

Multi-filing incidents

—

no multi-filing incident in sample

Max affected reported

3

as filed · State AG MA

Leak-site claims

0

none in sample

Identity resolution

Canonical name: Arch Underwriters Inc.
Normalized: arch underwriters— dedupe via name-norm; Microsoft / MSFT collapse to one row
GLEIF LEI: 549300PSZSTQ5N1HYK08
SEC EDGAR CIK: None — not an SEC registrant
Domain: None on record
Corporate parent: Arch Capital Group Ltd.— per SEC Exhibit 21 filing

Disclosure history (1)newest first

Massachusetts State AGas victim2026-09-01
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.