W. R. Berkley Corporation (WRB) has 20 known insider and institutional holders on record. The largest holder is MITSUI SUMITOMO INSURANCE CO LTD with 58,567,377 shares. Other notable holders include BERKLEY WILLIAM R and Berkley Capital, LLC.
Over the last 12 months, insiders have made 69 transactions in WRB stock — 60 buys (valued at $515.46M) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
WRB Insider Ownership
Top Holder
MITSUI SUMITOMO INSURANCE CO LTD
58,567,377 shares
Buys (12 mo)
60
$515.46M value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
58,567,377 |
2026-03-03 |
|
| 2 |
Berkley William R |
10 Percent Owner, Officer: Executive Chairman |
17,363,285 |
2025-08-19 |
|
| 3 |
Berkley Capital, Llc |
Other: See Remarks |
6,254,661 |
2018-02-12 |
|
| 4 |
Berkley William R Jr |
President and CEO |
4,552,770 |
2025-08-19 |
|
| 5 |
Shiel James G |
EVP - Investments |
797,197 |
2025-12-19 |
|
| 6 |
Ballard Eugene G |
EVP, Finance |
251,656 |
2017-08-09 |
|
| 7 |
Sgaglione Lucille T |
EVP |
241,036 |
2025-08-19 |
|
| 8 |
Lederman Ira S |
EVP & Secretary |
240,031 |
2019-12-30 |
|
| 9 |
Cole Robert P |
SVP - Regional Operations |
217,669 |
2010-03-04 |
|
| 10 |
Baio Richard Mark |
EVP & CFO |
214,175 |
2025-08-19 |
|
| 11 |
Welt Philip S |
EVP & Secretary |
200,539 |
2025-08-19 |
|
| 12 |
Nusbaum Jack H |
Director |
149,799 |
2020-06-12 |
|
| 13 |
Blaylock Ronald E |
Director |
118,900 |
2025-06-13 |
|
| 14 |
Augostini Christopher L |
Director |
106,769 |
2025-06-13 |
|
| 15 |
Mccleary James W |
SVP-reinsurance Operations |
105,919 |
2005-12-06 |
|
| 16 |
Hewitt Robert C |
SVP-excess and Surplus Lines |
85,000 |
2010-03-04 |
|
| 17 |
Stone Robert Daly |
SVP - Alt. Mkts. Operations |
76,698 |
2010-03-04 |
|
| 18 |
Hancock Paul J |
SVP - Chief Corporate Actuary |
75,875 |
2009-12-30 |
|
| 19 |
Patafio Clement P |
VP - Corporate Controller |
63,313 |
2012-12-18 |
|
| 20 |
Ferre Maria Luisa |
Director |
56,144 |
2025-06-13 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-03 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
38,991 |
$71.60 |
$2.79M |
| 2026-03-02 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
45,103 |
$72.29 |
$3.26M |
| 2026-02-27 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
147,000 |
$71.63 |
$10.53M |
| 2026-02-26 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
145,491 |
$71.65 |
$10.42M |
| 2026-02-25 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
154,512 |
$71.39 |
$11.03M |
| 2026-02-24 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
103,192 |
$70.52 |
$7.28M |
| 2026-02-23 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
203,590 |
$71.09 |
$14.47M |
| 2026-02-20 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
160,582 |
$70.80 |
$11.37M |
| 2026-02-19 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
300,986 |
$70.53 |
$21.23M |
| 2026-02-18 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
239,750 |
$70.58 |
$16.92M |
| 2026-02-17 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
281,386 |
$71.19 |
$20.03M |
| 2026-02-13 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
15,406 |
$69.73 |
$1.07M |
| 2026-02-12 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
17,599 |
$71.88 |
$1.27M |
| 2026-02-11 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
9,289 |
$69.59 |
$646.4K |
| 2026-02-10 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
21,884 |
$69.09 |
$1.51M |
| 2026-02-09 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
35,952 |
$69.27 |
$2.49M |
| 2026-02-06 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
15,694 |
$70.46 |
$1.11M |
| 2026-02-05 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
6,528 |
$70.79 |
$462.11K |
| 2026-02-04 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
2,585 |
$69.77 |
$180.34K |
| 2026-02-03 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
8,347 |
$67.75 |
$565.5K |
| 2026-02-02 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
237,062 |
$67.71 |
$16.05M |
| 2026-01-30 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
195,000 |
$68.36 |
$13.33M |
| 2026-01-29 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
262,282 |
$68.08 |
$17.86M |
| 2026-01-28 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
280,354 |
$67.58 |
$18.95M |
| 2026-01-27 |
Mitsui Sumitomo Insurance Co Ltd |
10 Percent Owner |
Informative Buy |
800 |
$65.86 |
$52.69K |
