Quick Takeaways
- Mark A. McCollum has 4 issuer positions tracked on this page.
- Estimated disclosed ownership value: $877,051.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Mark A. McCollum
- Location
- Houston, TX
- Summary
- The estimated net worth of Mark A. McCollum is at least $877,051 dollars as of 27 Jan 2026. Mark A. McCollum is the Director of WESTLAKE CORP and owns shares of WESTLAKE CORP (WLK) stock worth about $760.1K. Mark A. McCollum is the Director of Seadrill Ltd and owns shares of Seadrill Ltd (SDRL) stock worth about $60.2K. Mark A. McCollum is the Director of ONEOK INC /NEW/ and owns shares of ONEOK INC /NEW/ (OKE) stock worth about $56.7K.
- Signature
- /s/ Sarah M. Rechter Attorney-in-Fact for Mark A. McCollum
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Mark A. McCollum and return when a new Insider Trading filing changes the record on this page.
This uses the existing product follow flow to surface future filing-backed changes without guessing what they mean.
What Changed
- Largest disclosed position: WESTLAKE CORP ($760,120).
- Past-year value change for that position: .
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Source Evidence
Filed on Form 4
See Original Filing
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
Ownership of Mark A. McCollum
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| WLK | WESTLAKE CORP | Director | $760,120 | 08 Aug 2025 | ||
| SDRL | Seadrill Ltd | Director | $60,225 | 14 May 2025 | ||
| OKE | ONEOK INC /NEW/ | Director | $56,706 | 23 Jan 2026 | ||
| MRO | MARATHON OIL CORP | Director | $0 | 22 Nov 2024 |
Insider Transactions Reported by Mark A. McCollum:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.