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MARK L SHAPIRO

CIK 1235090 · last filed 2024-06-12

MARK L SHAPIRO is a corporate insider who has filed 33 SEC Form 4 insider transactions across 3 companies since 2007. The most recent filing, for WRB, was dated Jul 28, 2025. Current disclosed insider exposure totals $15.9M across reported positions.

"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

$15.87M

Companies

3

Total Filings

33

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.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
WRB Director 218,181 $72.73 $15.87M $0 18 2024-06-12
Boardwalk Pipeline Partners, LP (BWP) Delisted Director 33,907 — — $0 12 2018-02-26
BERKLEY W R CORP (BER) Delisted Director 23,833 — — $0 1 2007-05-09

Recent Filings

33 filings
Insider 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
2025-07-28 WRB Notice (144) −53,375 -$3.67M EDGAR
2024-06-12 WRB Grant (A) +2,534 $0 EDGAR
2023-06-14 WRB Grant (A) +3,479 $0 EDGAR
2022-06-15 WRB Grant (A) +2,995 $0 EDGAR
2021-12-03 WRB Mixed — -$448.3K EDGAR
2021-06-16 WRB Grant (A) +2,652 $0 EDGAR
2020-06-12 WRB Grant (A) +3,483 $0 EDGAR
2019-06-10 WRB Grant (A) +3,151 $0 EDGAR
2018-07-19 — Disp (D) −33,907 -$408.9K
2018-06-04 WRB Grant (A) +2,619 $0 EDGAR
Showing 1–10 of 33
Page 1 of 4
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.