Quick Takeaways
- John C. Plant has 3 issuer positions tracked on this page.
- Estimated disclosed ownership value: $704,322,013.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of John C. Plant
- Location
- Pittsburgh, PA
- Summary
- The estimated net worth of John C. Plant is at least $704,322,013 dollars as of 18 Feb 2026. John C. Plant is the Executive Chairman & CEO of Howmet Aerospace Inc. and owns shares of Howmet Aerospace Inc. (HWM) stock worth about $700.35M. John C. Plant is the Director of MASCO CORP /DE/ and owns shares of MASCO CORP /DE/ (MAS) stock worth about $2.96M. John C. Plant is the Director of JABIL INC and owns shares of JABIL INC (JBL) stock worth about $1.02M.
- Signature
- /s/ Margaret Lam, Assistant Secretary (Attorney-in-Fact)
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow John C. Plant 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: Howmet Aerospace Inc. ($700,347,353).
- Past-year value change for that position: -$125,570,480.
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.
Official SEC Source
Filed on Form 4
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
See Original FilingOwnership of John C. Plant
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| HWM | Howmet Aerospace Inc. | Executive Chairman & CEO | $700,347,353 | -$125,570,480 | -15% | 17 Feb 2026 |
| MAS | MASCO CORP /DE/ | Director | $2,956,910 | 09 May 2025 | ||
| JBL | JABIL INC | Director | $1,017,750 | 23 Jan 2025 |
Insider Transactions Reported by John C. Plant:
| 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.