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Mitsui Sumitomo Insurance Co Ltd

WRB
10% OWNER · BERKLEY W R CORP · CIK 0001142206
FILING MIX · LIFETIME100%/0%
BUYS
94
SELLS
0
TOTAL VALUE
$705.46M
COMPANIES
1
ACTIVE SINCE
Dec 2025
HOLDINGS NOW
58,707,265
AVG SELL PX
—
TRADE KIND
SHOWING 94 / 94
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
94 backtested trades · 8 horizons · 267 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Mitsui Sumitomo Insurance Co Ltd, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d94+53.19%+0.01%-0.14%+0.15%+0.28%0.55
14d94+45.74%-0.19%-0.45%+0.27%-0.52%0.81
30d94+44.68%-1.01%-1.84%+0.84%+0.40%2.01
60d94+18.09%-3.28%-1.77%-1.51%+1.11%-2.44
90d94+2.13%-4.66%+1.81%-5.93%-4.36%-9.85
180d94(79 pending)+46.67%-1.32%+8.31%-9.63%-11.13%—
1y94(94 pending)——————
2y94(94 pending)——————
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
WRB · 58,707,265 shares · as of Mar 3, 2026
014,695,11329,390,22544,085,33858,780,4502026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2025
2026
FLOW · 94 buys / 0 sellsCOVERAGE · 2 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
73,185$72.52$5.31M58,780,450Mar 3, 2026Mar 3, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
38,991$71.60$2.79M58,707,265Mar 3, 2026Mar 3, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
45,103$72.29$3.26M58,567,377Mar 2, 2026Mar 3, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
100,897$73.20$7.39M58,668,274Mar 2, 2026Mar 3, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
147,000$71.63$10.53M58,522,274Feb 27, 2026Feb 27, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
7,509$72.11$541.5K58,375,274Feb 26, 2026Feb 27, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
145,491$71.65$10.42M58,367,765Feb 26, 2026Feb 27, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
14,356$71.77$1.03M58,222,274Feb 25, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
154,512$71.39$11.03M58,207,918Feb 25, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
61,594$71.28$4.39M58,053,406Feb 24, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
103,192$70.52$7.28M57,991,812Feb 24, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
203,590$71.09$14.47M57,872,210Feb 23, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
16,410$71.80$1.18M57,888,620Feb 23, 2026Feb 25, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
160,582$70.80$11.37M57,668,620Feb 20, 2026Feb 20, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
300,986$70.53$21.23M57,464,024Feb 19, 2026Feb 20, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
44,014$71.50$3.15M57,508,038Feb 19, 2026Feb 20, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
239,750$70.58$16.92M57,117,788Feb 18, 2026Feb 18, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
45,250$70.96$3.21M57,163,038Feb 18, 2026Feb 18, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
281,386$71.19$20.03M56,878,038Feb 17, 2026Feb 18, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
15,406$69.73$1.07M56,592,058Feb 13, 2026Feb 13, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
4,314$70.30$303.3K56,596,372Feb 13, 2026Feb 13, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
280$71.18$19.9K56,596,652Feb 13, 2026Feb 13, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
17,599$71.88$1.27M56,574,251Feb 12, 2026Feb 13, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
2,401$72.76$174.7K56,576,652Feb 12, 2026Feb 13, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
9,289$69.59$646.4K56,541,911Feb 11, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
11,163$71.45$797.6K56,556,652Feb 11, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
3,578$70.50$252.3K56,545,489Feb 11, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
12,082$69.92$844.8K56,532,622Feb 10, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
21,884$69.09$1.51M56,520,540Feb 10, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
4,048$70.32$284.7K56,498,656Feb 9, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
35,952$69.27$2.49M56,494,608Feb 9, 2026Feb 11, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
15,694$70.46$1.11M56,454,350Feb 6, 2026Feb 6, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
4,306$71.39$307.4K56,458,656Feb 6, 2026Feb 6, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
6,528$70.79$462.1K56,425,184Feb 5, 2026Feb 6, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
13,472$71.25$959.9K56,438,656Feb 5, 2026Feb 6, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
22,415$70.25$1.57M56,418,656Feb 4, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
2,585$69.77$180.3K56,396,241Feb 4, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
8,347$67.75$565.5K56,362,003Feb 3, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
31,653$68.87$2.18M56,393,656Feb 3, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
13,159$68.42$900.3K56,353,656Feb 2, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
237,062$67.71$16.05M56,340,497Feb 2, 2026Feb 4, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
195,000$68.36$13.33M56,103,435Jan 30, 2026Jan 30, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
27,718$68.56$1.90M55,908,435Jan 29, 2026Jan 30, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
262,282$68.08$17.86M55,880,717Jan 29, 2026Jan 30, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
280,354$67.58$18.95M55,589,858Jan 28, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
28,577$67.89$1.94M55,618,435Jan 28, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
11,987$66.87$801.5K54,972,291Jan 27, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
2,671$69.04$184.4K55,309,504Jan 27, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
8,582$68.56$588.4K55,306,833Jan 27, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
325,960$67.40$21.97M55,298,251Jan 27, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
800$65.86$52.7K54,960,304Jan 27, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
76,389$67.88$5.19M54,959,504Jan 26, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
293,611$66.86$19.63M54,883,115Jan 26, 2026Jan 28, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
166,919$67.18$11.21M54,589,504Jan 23, 2026Jan 23, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
201,081$66.77$13.43M54,422,585Jan 23, 2026Jan 23, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
330,000$67.45$22.26M54,221,504Jan 22, 2026Jan 23, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
260,998$67.60$17.64M53,891,504Jan 21, 2026Jan 21, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
59,002$66.95$3.95M53,630,506Jan 21, 2026Jan 21, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
44,994$68.08$3.06M53,571,504Jan 20, 2026Jan 21, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
265,006$67.75$17.95M53,526,510Jan 20, 2026Jan 21, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
241,309$68.03$16.42M53,202,813Jan 16, 2026Jan 16, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
58,691$68.79$4.04M53,261,504Jan 16, 2026Jan 16, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
166,907$68.68$11.46M52,893,411Jan 15, 2026Jan 16, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
68,093$69.45$4.73M52,961,504Jan 15, 2026Jan 16, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
208,272$69.23$14.42M52,726,504Jan 14, 2026Jan 14, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
21,728$68.80$1.49M52,518,232Jan 14, 2026Jan 14, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
206,499$68.15$14.07M52,496,504Jan 13, 2026Jan 14, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
118,501$67.82$8.04M52,290,005Jan 13, 2026Jan 14, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
256,041$68.73$17.60M52,171,504Jan 12, 2026Jan 14, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
105,674$69.56$7.35M51,907,313Jan 9, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
8,150$70.12$571.4K51,915,463Jan 9, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
161,176$68.48$11.04M51,801,639Jan 9, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
4,187$68.79$288.0K51,449,650Jan 8, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
151,511$70.32$10.65M51,640,463Jan 8, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
39,302$69.69$2.74M51,488,952Jan 8, 2026Jan 9, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
254,622$68.47$17.43M51,435,085Jan 7, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
10,378$69.20$718.2K51,445,463Jan 7, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
122,931$69.93$8.60M51,088,106Jan 6, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
92,357$70.21$6.48M51,180,463Jan 6, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
35,894$70.23$2.52M50,811,489Jan 5, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
11,350$69.20$785.4K50,775,595Jan 5, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
153,686$70.78$10.88M50,965,175Jan 5, 2026Jan 7, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
237,734$69.35$16.49M50,764,245Jan 2, 2026Jan 2, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
230,000$70.27$16.16M50,526,511Dec 31, 2025Jan 2, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
205,000$70.83$14.52M50,296,511Dec 30, 2025Jan 2, 2026 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
205,000$70.77$14.51M50,091,511Dec 29, 2025Dec 29, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
220,000$70.56$15.52M49,886,511Dec 26, 2025Dec 29, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
220,000$70.51$15.51M49,666,511Dec 24, 2025Dec 29, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
2,027$71.15$144.2K49,446,511Dec 23, 2025Dec 29, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
232,546$70.31$16.35M49,444,484Dec 23, 2025Dec 29, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
39,940$69.97$2.79M49,049,878Dec 22, 2025Dec 22, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
162,060$70.33$11.40M49,211,938Dec 22, 2025Dec 22, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
204,000$69.50$14.18M49,009,938Dec 19, 2025Dec 22, 2025 ↗View →
WRB
BERKLEY W R CORP
PURCHASE10b5-1
10b5-1 plan
204,350$69.38$14.18M48,805,938Dec 18, 2025Dec 22, 2025 ↗View →
Other insiders · WRB
Loading peer insiders…
About this filer
CIK 0001142206
ROLE
10% Owner
PRIMARY
WRB
COMPANIES
1
ACTIVE SINCE
Dec 2025
MARKETPEEL · /INSIDER/0001142206DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

The morning brief, before the bell.

One short email. Insider buys, congressional trades, and plain-English analysis.

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