Insider transactions

MASON CAPITAL MANAGEMENT LLC

CIK 1218735 · last filed 2021-08-16

MASON CAPITAL MANAGEMENT LLC is a corporate insider who has filed 3 SEC Form 4 insider transactions across 1 company since 2013. Across all open-market trades the lifetime net is −$314.0M, making them a net seller over the disclosed history. The firm reports its address in New York, NY. 17 SEC filings were submitted jointly with & Wilcox Co Babcock.

"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.

Loading insider history…
Disclosed Exposure

$0

Companies

1

Total Filings

3

Lifetime Open-Market Net

-$314.02M

Charts

Trading activity, where the exposure sits, and each trade against the stock price.

Filer Profile

Reported Address
110 EAST 59TH STREET
30TH FLOOR
NEW YORK, NY 10022
Phone
(212) 771-1206
State of Incorporation
DE
Related Filers
& Wilcox Co Babcock — 17 joint filings, latest 2015-02-17
Michael E Martino — 17 joint filings, latest 2021-08-16
Kenneth M. Garschina — 15 joint filings, latest 2021-08-16
Mason Industrial Sponsor, LLC — 4 joint filings, latest 2021-02-08
SAIC, Inc. — 4 joint filings, latest 2009-02-17
Fortune Brands Home & Security, Inc. — 3 joint filings, latest 2013-02-14
TLC VISION CORP — 3 joint filings, latest 2006-02-14
CYPRESS SEMICONDUCTOR CORP /DE/ — 2 joint filings, latest 2009-02-17
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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
BWX Technologies, Inc. (BWC) Delisted 10%+ Owner 10,794,745 $10.15 $109.57M -$314.02M 2 2014-03-21

Recent Filings

3 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
2021-08-16 — Mixed +300,300 $3.46M
2014-03-21 BWX Technologies, Inc. (BWC) Delisted Sell (S) −3,300,000 -$108.22M EDGAR
2013-01-11 BWX Technologies, Inc. (BWC) Delisted Buy (P) −8,400,000 -$205.80M 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.