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SEC Form 4 reporting owner

Humpton Barbara

Humpton Barbara has filed 5 Form 4 transactions reported between February 13, 2026 and October 2, 2026, as Former Chief Executive Officer of USA Rare Earth, Inc. and Director of MARA Holdings, Inc..

Name as filed: Humpton Barbara

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Humpton Barbara holds 130,939 shares of USAR, worth $1.2M, 0.10% of the company.

As of their Oct 1, 2026 Form 4 (filed Oct 5, 2026) · the filing on SEC EDGAR · valued at the Oct 26, 2026 close of $8.91 · 132.6M shares outstanding on Oct 31, 2025

That filing was marked as no longer subject to Section 16, so later changes may not be reported.

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$1.2M
1 lines
Companies
2
with Form 4 filings
Latest transaction
Oct 2, 2026
transaction date

Roles and reported holdings

  • USARUSA Rare Earth, Inc.
    Oct 1, 2026 – Oct 2, 2026

    Former Chief Executive Officer

    Held directly130,939 sh

    Also reports 31,333 Restricted Stock Units, not counted as shares.

    As of Oct 1, 2026 · Form 4

    24 months: $1.2M sold

  • MARAMARA Holdings, Inc.
    Feb 13, 2026

    Director

    No common-stock holding reported on a purchase, sale, gift or withholding line.

Transaction history

All 5 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Oct 2, 2026USARFormer Chief Executive OfficerOpen-market saleCode S · direct88,391$1.2M@ $13.75Form 4
Oct 1, 2026USARFormer Chief Executive OfficerOption exerciseCode M · direct31,333$432K@ $13.80Form 4
Oct 1, 2026USARFormer Chief Executive OfficerOption exerciseCode M · direct104,443$1.4M@ $13.80Form 4
Oct 1, 2026USARFormer Chief Executive OfficerOption exerciseCode M · direct83,554$1.2M@ $13.80Form 4
Feb 13, 2026MARADirectorGrant or awardCode A · direct82,759—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares each ownership line is left at by the person’s latest Form 4, 4/A or 5: held directly, and through each trust or entity named on the filing. A second class of common stock that converts into the listed one counts as shares; options and restricted stock units are listed but not counted. Value uses the latest trade or close, and the share of the company uses the latest shares-outstanding count the company reported. Where a filing has not yet been read line by line, the figure comes from the latest direct and indirect lines that traded and is shown as “at least”.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.