WILLIAM R JR BERKLEY
CIK 1236253 · Chairman, President and CEO · last filed 2026-08-05
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$577.40M
Companies
3
Total Filings
46
Lifetime Open-Market Net
$0
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Recent Filings · Page 2 of 5
46 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-08-18 | WRB | Mixed | +47,362 | -$154.3K | EDGAR |
| 2021-08-09 | WRB | Mixed | +29,231 | -$92.5K | EDGAR |
| 2021-06-16 | WRB | Grant (A) | +2,652 | $0 | EDGAR |
| 2020-08-19 | WRB | Mixed | +24,935 | -$67.0K | EDGAR |
| 2020-08-07 | WRB | Mixed | +56,531 | -$153.7K | EDGAR |
| 2020-06-12 | WRB | Grant (A) | +3,483 | $0 | EDGAR |
| 2019-08-07 | WRB | Mixed | +159,280 | -$478.4K | EDGAR |
| 2019-06-10 | WRB | Grant (A) | +3,151 | $0 | EDGAR |
| 2019-06-10 | WRB | Grant (A) | +3,151 | $0 | EDGAR |
| 2018-08-08 | WRB | Mixed | +18,201 | -$60.5K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.