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Companies
▲ Purchases (0 ops.)
▼ Sales (19 ops.)
Latest filing published 10 Aug 2026 for Westlake CORP.
Insider track record
Disclosed buys
0
Disclosed sells
19
Not enough buy signals with a settled T+90 horizon to measure a track record yet.
Signal history
No signal scores available.
Mark A. Mccollum: trading record in brief
Mark A. Mccollum (board member) discloses dealings in 8 companies, chiefly Halliburton Co, Archrock, Inc. and Weatherford International plc. The record holds 130 filings, for trades running from 12 September 2006 to 8 August 2026.
The open-market record consists of 19 sales worth €12.4M, with no purchase. Besides market trades, the filings include 41 share grants and 21 option exercises.
Most recently, on 10 August 2026, the filings show an option exercise in Westlake Corp. The median gap between a trade and its publication by SEC (Form 4) is 2 days. For comparison, the SEC allows two business days to file a Form 4. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.
Companies and markets linked to Mark A. Mccollum
Open company profiles for insider transactions, fundamentals and analyst consensus when available.
Declarations13 total
2,168 sharesCommon StockSEC:0001193125-26-342006:0
727 shares@ US$78.00100.0% of flowCommon Stock, par value $0.01SEC:0001215888-26-000004:0
1,128 sharesCommon StockSEC:0001215888-25-000005:0
2,409 sharesCommon SharesSEC:0000950170-25-056133:0
8,169 sharesCommon StockSEC:0000950170-24-130182:0
1,136 sharesCommon StockSEC:0000950170-24-095193:0
8,130 shares0Common StockSEC:0000101778-24-000049:0
1,446 sharesCommon StockSEC:0001209191-23-045507:0
7,754 shares0Common StockSEC:0000101778-23-000062:0
415 shares0Common StockSEC:0000101778-22-000222:0
1,763 sharesCommon StockSEC:0001567619-22-016170:0
3,000 shares0Common StockSEC:0001567619-22-006353:0
2,400 sharesCommon StockSEC:0001567619-21-015725:0
13 of 13 declarations
