Insider trade

10% owner purchased ~$2.52M of WRB shares in the open market

Traded Jan 5, 2026 · Filed Jan 8, 2026

~$2.52M
Reported value · 36K sh @ $70.2323: 50.8M
Holds after · shares reported: -2.6%
stock since the trade · S&P 500 +11.1%, $70.71 → $68.90 on Oct 1

MITSUI SUMITOMO INSURANCE CO LTD, 10% owner's past purchases, 90 days after disclosure: 20 buys, median -6.1% vs S&P 500, beat it 1 of 20 times. Past results, not a forecast.

Why it stands out

A big owner of W. R. Berkley Corporation spent $2.52M of their very own money to buy W. R. Berkley Corporation shares.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Jan 5, 2026
Reporting period: Not applicable
Filed with the SEC: Jan 8, 2026

10% owner$1M+Holdings +0%

Context

Classification

open market purchase

Code P — open-market or private purchase

Absolute commitment

~$2,520,918

Shares × reported transaction price

Size band

$1M+

Ownership change

+0.1%

Purchase shares ÷ estimated pre-transaction holdings, from the filing

Rarity

First purchase in 0 months

Confirmed open-market purchases by the same insider in the available history

Largest by this insider

No

Compared with 12 earlier confirmed purchases

Cluster activity

No other insider purchases within 30 days

Distinct insiders at the same issuer with confirmed open-market purchases

Timing vs results

77 days after results of Oct 20, 2025, 21 days before results of Jan 26, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $70.71 on Jan 5, 2026, 25% above its 52-week low and 10% below its high, after an 8% drop over the previous 30 trading days

52-week range $56.70 (Jan 10, 2025) to $78.46 (Oct 14, 2025), 64% of the way up, from 250 adjusted closes. 30 trading days earlier: $76.69 on Nov 19, 2025. Describes the past only, not a forecast

Planned / mechanical clue

None found in footnotes

Only flagged when a footnote says so; never inferred

After it was reported

After	Stock	S&P 500	Difference
7 days	-2.2%	+0.4%	-2.6%
30 days	-1.4%	+0.6%	-2.0%
90 days	-4.3%	-2.0%	-2.3%
180 days	+1.9%	+8.4%	-6.6%

Past results only. Not a forecast.

Source receipt

Record ID: 0001193125-26-006715
Filed / recorded: Jan 8, 2026, 12:30 AM UTC
Added to OQRO: Oct 2, 2026, 12:29 PM UTC
Parser: form4-xml-v1
Data quality: Verified: identifiers matched exactly
Issuer: BERKLEY W R CORP
Issuer CIK: 11544
Ticker: WRB
Reporting person: MITSUI SUMITOMO INSURANCE CO LTD
Relationship: 10% owner
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Jan 5, 2026
Transaction code: P
Shares / units: 35,894
Price per share: $70.2323
Acquired / disposed: Acquired (A)
Shares owned after: 50,811,489
Ownership form: Direct
Amendment: No

Footnotes from the filing

The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025.
The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.706 to $70.5996.
The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. ("MSI"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. ("MS&AD"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein.

Around the same time

Major shareholder bought8mo ago

~$462KReported value · 6,528 sh @ $70.7889

A big owner of W. R. Berkley Corporation spent $462K of their very own money to buy W. R. Berkley Corporation shares.

Why it stands out Official record

Major shareholder bought8mo ago

~$960KReported value · 13K sh @ $71.2528

A big owner of W. R. Berkley Corporation spent $960K of their very own money to buy W. R. Berkley Corporation shares.

Why it stands out Official record

Major shareholder bought8mo ago

~$1.11MReported value · 16K sh @ $70.4608

A big owner of W. R. Berkley Corporation spent $1.11M of their very own money to buy W. R. Berkley Corporation shares.

Why it stands out Official record

MITSUI SUMITOMO INSURANCE CO LTD, 10% owner's past purchases, 90 days after disclosure: 20 buys, median -6.1% vs S&P 500, beat it 1 of 20 times. Past results, not a forecast.