Mullin, Markwayne

Senator Markwayne Mullin (R-OK) has represented Oklahoma in the Senate since November 2023, following six terms in the House of Representatives where he served from 2013 to 2023. A former professional MMA fighter and successful business owner of a plumbing company, Mullin is known for his conservative positions on energy policy, his seat on the Armed Services Committee, and his notably confrontational style, including a near-physical altercation with a union leader during a Senate hearing. His trading activity is substantial, with 390 disclosed transactions between January 2023 and September 2025, representing an estimated volume between $11.1M and $28.1M. His portfolio shows concentrated activity in stocks like Sensata Technologies (ST), Zoetis (ZTS), Century Casinos (CNTY), Goldman Sachs (GS), and Applied Materials (AMAT), though his recent trading has slowed considerably with only 2 transactions in the past 90 days. Mullin's significant trading volume places him among the more active congressional investors, raising questions about potential conflicts given his committee assignments overseeing defense and national security matters.