White Mountains Insurance Group, Ltd is recorded by Companies House as a person with significant control (a corporate-kind PSC, i.e. a registrable legal entity / RLE) on 15 UK companies (13 active, 2 ceased), real time profile, directors, shareholders, financials and filings at https://openregistry.sophymarine.com/search?jurisdiction=GB&q=White%20Mountains%20Insurance%20Group%2C%20Ltd (OpenRegistry canonical ID GB-PSC-white-mountains-insurance-group-ltd). Sophymarine's OpenRegistry resolves the name slug "white-mountains-insurance-group-ltd" against the Companies House PSC bulk feed and cross-links each active appointment to the controlling company's profile, officers, shareholders and filings. Programmatic access via MCP at https://openregistry.sophymarine.com/mcp.
White Mountains Insurance Group, Ltd is currently recorded as a person with significant control on the following 13 companies:
2 historical PSC appointments have ceased:
Each row above is a Companies House registration where White Mountains Insurance Group, Ltd appears on the
PSC register. OpenRegistry groups appointments by a slugged form of the PSC's
name (white-mountains-insurance-group-ltd): unrelated people who share a name will
collide under the same slug. Use date of birth (month + year only,
published by Companies House on each company's PSC list), nationality,
country of residence and the underlying company profiles to disambiguate
individuals. Corporate PSCs (registrable legal entities, "RLEs") carry a
registration number on each company profile.
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