Quick Takeaways
- Mark Mason has 2 issuer positions tracked on this page.
- Estimated disclosed ownership value: $30,644,067.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Mark Mason
- Location
- New York, NY
- Summary
- The estimated net worth of Mark Mason is at least $30,644,067 dollars as of 24 Feb 2026. Mark Mason is the Chief Financial Officer of CITIGROUP INC and owns shares of CITIGROUP INC (C) stock worth about $29.83M. Mark Mason is the Director of MICROSOFT CORP and owns shares of MICROSOFT CORP (MSFT) stock worth about $810.1K.
- Signature
- Mark Mason by Joseph B. Wollard, Attorney-in-Fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Mark Mason and return when a new Insider Trading filing appears.
This tracks SEC filing changes for this page using existing product update flows.
What Changed
- Largest disclosed position: CITIGROUP INC ($29,834,004).
- Past-year value change for that position: -$416,045.
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 Mason
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| C, C-PN | CITIGROUP INC | Chief Financial Officer | $29,834,004 | -$416,045 | -1.4% | 20 Feb 2026 |
| MSFT | MICROSOFT CORP | Director | $810,063 | 30 Jan 2026 |
Insider Transactions Reported by Mark Mason:
| 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.