Mark Lawrence Plaumann

Companies

• MAMMOTH ENERGY SERVICES, INC.Board member Sep 17, 2026 to now¹
• Diamondback EnergyBoard member Oct 11, 2012 to now²
• Republic Airways HoldingsBoard member Jun 12, 2006 to Nov 17, 2015³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Diamondback Energy FANG20,125 shares⁴$4.1M at $203.92Aug 21, 2026
• MEMAMMOTH ENERGY SERVICES, INC. TUSK5,000 shares⁵$13.7K at $2.75Sep 16, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Sep 16, 2026Bought 5,000 shares at $3.00 of MAMMOTH ENERGY SERVICES, INC.⁵
• Aug 21, 2026Sold 1,000 shares at $210.58 of Diamondback Energy⁴
• Jun 9, 2026Sold 500 shares at $196.50 of Diamondback Energy⁶
• May 20, 2026Granted 982 shares of Diamondback Energy⁷
• Jun 19, 2025Other 2,965 shares of Diamondback Energy⁸
• May 21, 2025Granted 1,417 shares of Diamondback Energy⁹
• Dec 5, 2024Gift 100 shares of Diamondback Energy¹⁰
• Nov 13, 2024Sold 240 shares at $181.00 of Diamondback Energy¹¹
• Nov 13, 2024Gift 2,310 shares of Diamondback Energy¹¹
• Nov 13, 2024Sold 1,150 shares at $181.00 of Diamondback Energy¹¹
• Nov 12, 2024Other 5,862 shares of Diamondback Energy¹¹
• Nov 12, 2024Other 11,724 shares of Diamondback Energy¹¹
• Jun 6, 2024Granted 1,035 shares of Diamondback Energy¹²
• Jun 8, 2023Granted 1,527 shares of Diamondback Energy¹³
• Jun 9, 2022Granted 1,274 shares of Diamondback Energy¹⁴