secwatch / observer
8-K filed April 1, 2026, 7:59 PM ET ticker WTM CIK 0000776867
M&A confidence high sentiment positive materiality 0.60

White Mountains acquires majority stake in BaseSix for ~$97M

WHITE MOUNTAINS INSURANCE GROUP LTD

item 8.01item 9.01

Machine-readable event card

schema_version
secwatch.filing_event.v1
accession
0001628280-26-022818
form_type
8-K
ticker
WTM
cik
0000776867
company_name
WHITE MOUNTAINS INSURANCE GROUP LTD
filed_at
2026-04-01T23:59:59+00:00
discovered_at
2026-05-14T18:02:33.717289+00:00
generated_at
2026-05-15T08:04:03.303145+00:00
sec_items
["8.01", "9.01"]
event_type
m_and_a
sentiment
positive
materiality_score
0.6
calibrated_materiality_score
0.6
confidence
high
secwatch_canonical_url
https://secwatch.observer/filing/0001628280-26-022818
json_url
https://secwatch.observer/filing/0001628280-26-022818.json
markdown_url
https://secwatch.observer/filing/0001628280-26-022818.md
text_url
https://secwatch.observer/filing/0001628280-26-022818.txt
edgar_index_url
https://www.sec.gov/Archives/edgar/data/776867/000162828026022818/0001628280-26-022818-index.htm
edgar_primary_document_url
https://www.sec.gov/Archives/edgar/data/776867/000162828026022818/wtm-20260401.htm
generated_by_model
deepseek-v4-flash:cloud@v2
review_status
machine_generated
human_reviewed
false
corrected
false
correction_note
null
correction_timestamp
null
superseded_by
null
JSON Markdown Plain text

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same SEC item: 8.01, 9.01 same event type: m_and_a similar materiality

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same SEC item: 8.01, 9.01 same event type: m_and_a similar materiality

Filing page SEC filing

Source: SEC EDGAR
accession 0001628280-26-022818
view filing index on sec.gov
view primary document

This headline and bullets were generated automatically by deepseek-v4-flash:cloud@v2 from the public filing. Read the source on SEC.gov before relying on any specific claim. Not investment advice. See methodology for how this pipeline works.