Insider Trading & Ownership of John C. Plant

Location
Pittsburgh, PA
Summary
The estimated net worth of John C. Plant is at least $705,127,100 dollars as of 12 May 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 $3.05M. John C. Plant is the Director of JABIL INC and owns shares of JABIL INC (JBL) stock worth about $1.73M.
Signature
Yvette M. VanRiper by Power of Attorney
All Insider Reports
All Insider Reports

Follow Filing Activity

Follow John C. Plant 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. If you create an account from here, we will bring you back after verification.

Create free account and return here Already have an account? Sign in and return here

Quick Takeaways

  • John C. Plant has 3 issuer positions tracked on this page.
  • Estimated disclosed ownership value: $705,127,100.
  • Recent insider filing activity is available below.

What Changed

  • Largest disclosed position: Howmet Aerospace Inc. ($700,347,353).
  • 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

Insider ownership context is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Ownership of John C. Plant

MAS Forms 3/4/5

MASCO CORP /DE/

Relationship
Director
Holdings value
$3,053,152
Past year net change
Change %
Report period
08 May 2026
JBL Forms 3/4/5

JABIL INC

Relationship
Director
Holdings value
$1,726,595
Past year net change
Change %
Report period
23 Apr 2026

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.
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Here you can make detailed settings or revoke your consent (in part if necessary) with effect for the future. For further information, please refer to our Privacy Policy .