13F Pro

SEC Form 4 reporting owner

Plaumann Mark Lawrence

Plaumann Mark Lawrence has filed 4 Form 4 transactions reported between May 20, 2026 and September 16, 2026, as Director of MAMMOTH ENERGY SERVICES, INC. and Director of Diamondback Energy, Inc..

Name as filed: Plaumann Mark Lawrence

Open-market buys, 24 mo
$15K
1 lines
Open-market sales, 24 mo
$309K
2 lines
Companies
2
with Form 4 filings
Latest transaction
Sep 16, 2026
transaction date

Roles and reported holdings

  • TUSKMAMMOTH ENERGY SERVICES, INC.
    Sep 16, 2026

    Director

    Held directly5,000 sh as of Sep 16, 2026 · Form 4

    24 months: $15K bought

  • FANGDiamondback Energy, Inc.
    May 20, 2026 – Aug 21, 2026

    Director

    Held directly12,437 sh as of Aug 21, 2026 · Form 4

    24 months: $309K sold

Transaction history

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

DateCompanyTypeSharesValueFiling
Sep 16, 2026TUSKDirectorOpen-market purchaseCode P · direct5,000$15K@ $3.00Form 4
Aug 21, 2026FANGDirectorOpen-market saleCode S · direct1,000$211K@ $210.58Form 4
Jun 9, 2026FANGDirectorOpen-market saleCode S · direct500$98K@ $196.50Form 4
May 20, 2026FANGDirectorGrant or awardCode A · direct982—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 owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

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