Berkley W R WRB Insider Ownership

Updated Oct 11, 2026

Over the past year, WRB insiders bought $705.46 million of stock (10.18Mn shares) on the open market and sold none.

• Among WRB's insiders, Mitsui Sumitomo Insurance Co Ltd (10% owner) was the top open-market buyer in the past 12 months, with $705.46 million of stock purchased (10.18Mn shares) and the latest purchase on March 3, 2026.
• Outside the open market, Berkley W R insiders received 115.77K shares in stock awards, gave up 5.38K shares to cover taxes or exercise prices and gave away 1.25K shares as gifts over the past 12 months.
• According to Business Quant data, insiders at Berkley W R reported 84.04Mn shares in total in their latest Form 4 filings, up 0.16% from 83.91Mn shares at the end of Q2 2026.
• By type of ownership, WRB insiders hold 98.36% of their shares directly (82.66Mn shares) and 1.64% indirectly (1.38Mn shares).
• Holdings in Berkley W R stock are reported by 15 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
• WRB's largest insider holders by reported holdings are Mitsui Sumitomo Insurance Co Ltd (10% owner, 58.78Mn shares), William R. Berkley (Executive Chairman, 17.37Mn shares) and William R. Berkley Jr. (Chairman, President and CEO, 6Mn shares).
• Mitsui Sumitomo Insurance Co Ltd holds 69.94% of the combined insider position in Berkley W R.
• Institutions held 71.70% of Berkley W R's outstanding shares in their Q2 2026 13F filings, insiders about 21.60% based on their latest Form 4 filings, and other investors, including the public, the remaining 6.70%.
• In the last 12 months, 35 Form 4 filings with transactions in WRB stock came from 14 insiders.
• The insider holdings and trades above for Berkley W R reflect Form 4 filings through August 5, 2026.