Mark Lawrence Plaumann

This profile gathers the share dealings of Mark Lawrence Plaumann across 2 companies, led by Diamondback Energy, Inc. and Mammoth Energy Services, Inc. We count 12 filings; the first trade dates from 3 June 2021 and the latest from 16 September 2026.

On the open market, the record shows 1 purchase worth €13k and 2 sales worth €180k. The totals do not cover 1 filing with an undisclosed amount. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Outside the open market, there are 6 share grants. In 2026 alone, the filings show 1 purchase and 2 sales.

The record was last updated on 17 September 2026 with an open-market purchase (€13k) in Mammoth Energy Services, Inc. The median gap between a trade and its publication by SEC (Form 4) is 4 days. Section 16 rules allow two business days to file each Form 4. A sale on its own says little: insiders also sell to pay tax, fund a purchase or diversify. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.