Insider trade

10% owner purchased ~$16.2M of WRB shares in the open market

Traded Dec 31, 2025 · Filed Jan 3, 2026

~$16.2M
Reported value · 230K sh @ $70.2652: 50.5M
Holds after · shares reported: -1.7%
stock since the trade · S&P 500 +12.0%, $70.12 → $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 $16.2M 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: Dec 31, 2025
Reporting period: Not applicable
Filed with the SEC: Jan 3, 2026

10% owner$1M+Holdings +1%

Context

Classification

open market purchase

Code P — open-market or private purchase

Absolute commitment

~$16,160,996

Shares × reported transaction price

Size band

$1M+

Ownership change

+0.5%

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 10 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

72 days after results of Oct 20, 2025, 26 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 $70.12 on Dec 31, 2025, 24% above its 52-week low and 11% below its high, after a 9% drop over the previous 30 trading days

52-week range $56.70 (Jan 10, 2025) to $78.46 (Oct 14, 2025), 62% of the way up, from 250 adjusted closes. 30 trading days earlier: $77.10 on Nov 17, 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	-2.8%	+1.1%	-3.9%
30 days	-0.7%	-0.2%	-0.5%
90 days	-6.4%	-4.2%	-2.2%
180 days	+0.3%	+9.2%	-8.9%

Past results only. Not a forecast.

Source receipt

Record ID: 0001193125-26-001178
Filed / recorded: Jan 3, 2026, 12:00 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: Dec 31, 2025
Transaction code: P
Shares / units: 230,000
Price per share: $70.2652
Acquired / disposed: Acquired (A)
Shares owned after: 50,526,511
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 $70.08 to $70.785.
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

~$17.9MReported value · 262K sh @ $68.0816

A big owner of W. R. Berkley Corporation spent $17.9M of their very own money to buy W. R. Berkley Corporation shares.

Why it stands out Official record

Major shareholder bought8mo ago

~$1.9MReported value · 28K sh @ $68.5605

A big owner of W. R. Berkley Corporation spent $1.9M of their very own money to buy W. R. Berkley Corporation shares.

Why it stands out Official record

Major shareholder bought8mo ago

~$13.3MReported value · 195K sh @ $68.3611

A big owner of W. R. Berkley Corporation spent $13.3M 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.