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MITSUI SUMITOMO INSURANCE CO LTD

CIK 1142206 · last filed 2026-02-18

MITSUI SUMITOMO INSURANCE CO LTD is a corporate insider who has filed 3 SEC Form 4 insider transactions across 1 company since 2025. The most recent filing shows the insider bought $80.3M of WRB on Feb 18, 2026. Across all open-market trades the lifetime net is +$343.0M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $3.95B across reported positions. The firm reports its address in Tokyo, M0. 21 SEC filings were submitted jointly with MS&AD Insurance Group Holdings, Inc.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$3.95B

Companies

1

Total Filings

3

Lifetime Open-Market Net

$343.00M

Filer Profile

Reported Address
9, KANDA SURUGADAI 3-CHOME
CHIYODA-KU
TOKYO, M0 101-8011
Phone
81332593111
State of Incorporation
Japan
Related Filers
MS&AD Insurance Group Holdings, Inc. — 21 joint filings, latest 2026-03-03
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
WRB 10%+ Owner 56,878,038 $69.50 $3.95B $343.00M 3 2026-02-18

Recent Filings

3 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-02-18 WRB Buy (P) +1,132,772 $80.33M EDGAR
2026-01-28 WRB Buy (P) +2,057,862 $138.60M EDGAR
2025-12-29 WRB Buy (P) +1,759,146 $124.08M EDGAR
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.