White Mountains Insurance Group Ltd (WTM) SEC filings and CIK.
WTM’s SEC Central Index Key (CIK) is 0000776867, or 776867 without leading zeros. The SEC’s ticker file lists it as WHITE MOUNTAINS INSURANCE GROUP LTD.
- Ticker
- WTM
- CIK
- 0000776867
- Other tickers
- None
- Insider transactions, Q3 2026
- 2
Insider trading
In Q3 2026, insiders at White Mountains Insurance Group Ltd reported 2 non-derivative transactions on 3 Forms 3, 4 and 5, including 0 open-market purchases and 0 sales.
Recent filings we observed
| Filed | Form | Accession |
|---|---|---|
| 2026-10-30 | SCHEDULE 13D/A | 0000950157-26-001142 |
Get WTM SEC data through the API
curl "https://sec-api.dev/api/v1/filings?cik=776867&limit=10" \
-H "Authorization: Bearer $SEC_API_KEY"curl "https://sec-api.dev/api/v1/companies/776867" \
-H "Authorization: Bearer $SEC_API_KEY"curl "https://sec-api.dev/api/v1/facts/776867?taxonomy=us-gaap&concept=Revenues&limit=10" \
-H "Authorization: Bearer $SEC_API_KEY"Ticker to CIK API · SEC filings API · White Mountains Insurance Group Ltd on SEC.gov
Questions
What is WTM’s CIK number?
WTM’s SEC Central Index Key (CIK) is 0000776867, or 776867 without leading zeros. The SEC’s ticker file lists it as WHITE MOUNTAINS INSURANCE GROUP LTD.
How do I find White Mountains Insurance Group Ltd’s 10-K?
Request /api/v1/filings?cik=776867&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.
Plain-text version for agents and LLMs: /companies/wtm.md
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.