W. R. Berkley (WRB) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
W. R. Berkley Corporation (WRB) insider buying and selling: 50 purchases, no sales
69 Form 4 Table I transactions filed with the SEC by W. R. Berkley Corporation insiders between 2025-12-19 and 2026-08-05 (15-month history): 50 open-market purchases and 0 sales, plus 19 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a purchase of $24.8M by Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. on 2026-01-26.
W. R. Berkley insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, W. R. Berkley insiders filed 50 purchases worth $705.5M on the open market, and no sales.
The biggest buyer was Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. (10% Owner): $705.5M in 50 purchases, the only buyer.
The largest trade of the period was a purchase of $24.8M on Jan 26, 2026, by Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. (10% Owner), under a 10b5-1 plan. Form 4 on sec.gov (0001193125-26-027858).
All 50 purchases were scheduled under a 10b5-1 plan.
The latest purchase is from Mar 3, 2026.
Against its sector (Financial Services, 70 companies with an insider page on this site), over the same dates the median is 10 sales and 0 purchases on the open market. W. R. Berkley has no sales, like 3 of the other 69, ranks 1 of 70 by net dollars bought, and 32 of the 70 have at least one purchase, W. R. Berkley included.
The 20 most important trades
The 50 open-market purchases first, then the rest, each type from largest to smallest. The full history is in the tool above, already searched.
See all 69 WRB trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-01-26 | 2026-01-28 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $24.8M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $66.45 to $67.40. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6, 7, 8, 9, 10 and 11. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.4004 to $68.19. | SEC |
| 2026-01-23 | 2026-01-23 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $24.6M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $66.5195 to $66.9993. F3 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. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.00 to $67.9353. | SEC |
| 2026-02-19 | 2026-02-20 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $24.4M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.0699 to $70.9988. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4 and 5. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $71.0014 to $72.026. | SEC |
| 2026-01-27 | 2026-01-28 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $23.6M | P — Open-market purchase (scheduled 10b5-1)7 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $65.77 to $65.975. F3 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. F6 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $66.03 to $66.9994. F7 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.00 to $67.82. F8 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.25 to $68.99. F9 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.37. | SEC |
| 2026-01-22 | 2026-01-23 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $22.3M | P — Open-market purchase (scheduled 10b5-1)3 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.09 to $67.66. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4 and 5. F3 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. | SEC |
| 2026-01-13 | 2026-01-14 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $22.1M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.57 to $67.9993. F3 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. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.00 to $68.965. | SEC |
| 2026-01-21 | 2026-01-21 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $21.6M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $66.5523 to $67.40. F3 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. F6 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.41 to $68.13. | SEC |
| 2026-01-20 | 2026-01-21 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $21.0M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.00 to $67.9998. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5 and 6. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.00 to $68.2013. | SEC |
| 2026-01-28 | 2026-01-28 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $20.9M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F10 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $66.87 to $67.80. F3 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. F11 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.8011 to $68.015. | SEC |
| 2026-01-16 | 2026-01-16 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $20.5M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.68 to $68.67. F3 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. F6 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.6711 to $69.055. | SEC |
| 2026-02-18 | 2026-02-18 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $20.1M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.9646 to $70.90. F3 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. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.9003 to $71.435. | SEC |
| 2026-02-17 | 2026-02-18 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $20.0M | P — Open-market purchase (scheduled 10b5-1)3 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.595 to $71.573. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4 and 5. F3 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. | SEC |
| 2026-01-29 | 2026-01-30 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $19.8M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.43 to $68.40. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4 and 5. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.4004 to $69.015. | SEC |
| 2026-01-09 | 2026-01-09 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $19.0M | P — Open-market purchase (scheduled 10b5-1)5 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F6 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.36 to $68.9975. F3 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. F7 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.9974. F8 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.0011 to $70.4398. | SEC |
| 2026-01-07 | 2026-01-07 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $18.2M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F8 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.07 to $68.9999. F3 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. F9 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.445. | SEC |
| 2026-01-12 | 2026-01-14 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $17.6M | P — Open-market purchase (scheduled 10b5-1)3 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.42 to $69.30. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6 and 7. F3 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. | SEC |
| 2026-02-02 | 2026-02-04 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $17.0M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.43 to $67.9942. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6, 7 and 8. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $67.43 to $67.9942. | SEC |
| 2025-12-23 | 2025-12-29 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $16.5M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.1731 to $70.99. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6 and 7. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $71.06 to $71.18. | SEC |
| 2026-01-02 | 2026-01-02 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $16.5M | P — Open-market purchase (scheduled 10b5-1)3 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F5 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.92 to $69.77. F3 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. | SEC |
| 2026-01-15 | 2026-01-16 | Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | $16.2M | P — Open-market purchase (scheduled 10b5-1)4 Form 4 footnotesF1 The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. F2 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.31 to $68.9978. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5 and 6. F3 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. F4 The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.775. | SEC |
The period balance: money in, money out
In the Form 4 filings submitted between Dec 19, 2025 and Aug 5, 2026 there is not one open-market sale of W. R. Berkley Corporation: 50 open-market purchases worth $705.5M and zero dollars sold.
Only codes P and S count, where an insider puts in or takes out their own money. A buying balance like W. R. Berkley Corporation's is the less common case in the S&P 500: its insiders are already paid in stock and still put in their own money. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| P | Open-market purchase | 50 | $705.5M |
| A | Grant or award | 14 | $0 |
| F | Tax withholding (shares surrendered for taxes) | 4 | $436k |
| G | Gift | 1 | $0 |
| Total | Everything filed in the period | 69 | $705.9M |
15 of the 69 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 14 distinct people or entities have filed W. R. Berkley Corporation transactions: 1 bought on the open market and none sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Mitsui Sumitomo Insurance Co Ltd, Ms&Ad Insurance Group Holdings, Inc. | 10% Owner | 50 | $705.5M (50) | — | 2026-03-03 |
| Berkley William R Jr | Chairman, President and CEO | 3 | — | — | 2026-08-05 |
| Shiel James G | EVP - Investments | 3 | — | — | 2026-08-05 |
| Baio Richard Mark | EVP & CFO | 2 | — | — | 2026-08-05 |
| Welt Philip S | EVP & Secretary | 2 | — | — | 2026-08-05 |
| Augostini Christopher L | Director | 1 | — | — | 2026-06-04 |
| Berkley William R | Executive Chairman | 1 | — | — | 2026-06-04 |
| Blaylock Ronald E | Director | 1 | — | — | 2026-06-04 |
Shown here are the 8 who moved the most money, out of 14. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Jan 2026: 20 purchases and 0 sales, worth $380.7M. 11 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 0 | $0 |
| Oct 2025 | 0 | $0 | 0 | $0 |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 9 | $135.3M | 0 | $0 |
| Jan 2026 | 20 | $380.7M | 0 | $0 |
| Feb 2026 | 19 | $170.7M | 0 | $0 |
| Mar 2026 | 2 | $18.7M | 0 | $0 |
| Apr 2026 | 0 | $0 | 0 | $0 |
| May 2026 | 0 | $0 | 0 | $0 |
| Jun 2026 | 0 | $0 | 0 | $0 |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 0 | $0 |
| Sep 2026 | 0 | $0 | 0 | $0 |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
W. R. Berkley Corporation (WRB) analysis page →
Other Financial Services companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
W. R. Berkley's 50 open-market purchases (code P) are the rare signal: insiders are already paid in stock, so buying more means putting in their own money. The latest filing is from Aug 5, 2026, and a Form 4 arrives up to two business days after the trade.
20 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.