Markwayne Mullin Stock Trades: Oklahoma's Armed Services Senator and the Oil-Defense-Tech Overlap

Who is Markwayne Mullin?

Markwayne Mullin (R-OK) is a Republican senator from Oklahoma, first elected to the House of Representatives in 2012 and elevated to the Senate in a 2022 special election following the retirement of Jim Inhofe. He is currently in his first full Senate term.

Before politics, Mullin was a licensed master plumber who built Mullin Plumbing into a multi-location business serving the Tulsa area. He also competed in mixed martial arts during his youth — a background that became nationally relevant in November 2023 when, during a Senate HELP Committee hearing, he challenged Teamsters president Sean O'Brien to a physical confrontation on the Senate floor. The exchange went viral and became one of the more memorable moments in recent Senate history.

Mullin is a member of the Cherokee Nation — one of the few sitting senators with Native American heritage — and previously chaired the Senate Indian Affairs Committee. He currently serves on the Senate Armed Services Committee, the Health, Education, Labor, and Pensions (HELP) Committee, and the Energy & Natural Resources Committee.

Oklahoma's economy and why it matters

Oklahoma is one of the top five oil and natural gas producing states in the country. The state's economy is anchored by energy extraction — Devon Energy, ONEOK, and SandRidge Energy are all Oklahoma-headquartered — and by a substantial federal military presence. Tinker Air Force Base in Oklahoma City and Fort Sill in Lawton represent billions of dollars in annual Pentagon investment in the state Mullin represents.

The intersection of energy and defense spending is not incidental to his Senate work. His Energy & Natural Resources Committee assignment gives him a direct legislative seat on federal oil and gas leasing policy, pipeline regulation, and mineral rights on federal lands — all of which directly affect Oklahoma's economic base. His Armed Services seat gives him access to information about defense procurement decisions, base force structures, and military budget priorities that affect Oklahoma installations.

Both channels represent potential informational overlap with publicly traded companies. His STOCK Act filings give us a window into which sectors he has chosen to invest in alongside those committee responsibilities.

The Microsoft trade: $250,000+ on a major DOD cloud contractor

The single most structurally notable trade in Mullin's disclosed filing history is a buy of Microsoft ($MSFT) worth between $250,001 and $500,000, disclosed in November 2025. That is one of the largest disclosed individual stock purchases in the Capitol Gains dataset for any senator during that period.

The committee context is what makes this trade structurally interesting. Microsoft is one of the largest federal technology contractors in the United States. The company won the Joint Warfighter Cloud Capability (JWCC) contract — the Pentagon's multi-cloud successor to the contested JEDI contract — alongside Amazon, Google, and Oracle, with a ceiling value estimated at up to $9 billion. Microsoft Azure is deeply embedded in classified and sensitive Defense Department workloads.

A senator on the Armed Services Committee, which oversees defense procurement and technology investment, purchasing a position of this scale in Microsoft is precisely the kind of trade the STOCK Act was designed to make visible. No public evidence suggests the trade involved non-public information, and it was filed within STOCK Act requirements. But the structural alignment between his committee role and this particular company is exactly what critics of congressional trading point to as the unresolved problem with disclosure-only reform.

Commodity fund trades and Oklahoma's energy economy

In October 2024, Mullin disclosed two large commodity ETF purchases — PDBC (Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF) and a high-yield bond ETF — each in the $250,001–$500,000 range. PDBC provides broad commodity exposure with a meaningful allocation to energy: crude oil, natural gas, and refined products through futures contracts.

Holding energy commodity exposure via a fund rather than individual oil company stock creates some separation from direct corporate conflicts. But for a senator from Oklahoma who sits on the Energy & Natural Resources Committee and whose state economy is substantially built on oil and gas extraction, broad energy commodity exposure is not a neutral allocation. Energy policy decisions — federal drilling permits on public lands, LNG export approvals, pipeline right-of-way rules — all flow through or are influenced by the Energy & Natural Resources Committee, and all directly affect the commodity prices that PDBC tracks.

The chip selloff: timing around April 2025 tariff uncertainty

In April 2025, during the period of peak tariff uncertainty following the Trump administration's Liberation Day announcements and the subsequent 90-day partial pause, Mullin disclosed sales of Applied Materials ($AMAT) and Lam Research ($LRCX) — both in the $50,001–$100,000 range — along with Valero Energy ($VLO) and T-Mobile ($TMUS).

AMAT and LRCX are semiconductor equipment manufacturers with significant exposure to export controls and trade policy — exactly the domain most directly affected by the tariff announcements. The Armed Services Committee has jurisdiction over export control legislation, including semiconductor technology restrictions relevant to China. The timing of these chip equipment sells relative to the tariff announcements has drawn attention from researchers tracking congressional trading activity during that window.

STOCK Act filings disclose timing but not intent. Trades disclosed in April could reflect decisions made weeks earlier given the 45-day reporting window. These are documented data points, not legal allegations.

The HELP Committee overlap: education and healthcare stocks

Mullin's HELP Committee seat adds a third informational channel. The Health, Education, Labor, and Pensions Committee has jurisdiction over healthcare legislation — drug pricing, insurance regulation, pharmaceutical approval processes — and education policy, including federal funding for K-12 and higher education programs.

His disclosed trades include multiple positions in Stride Inc ($LRN), an online education company, making it one of his most frequently traded tickers. Stride operates K-12 virtual schools and career learning programs — a company whose business model is directly shaped by federal education funding and policy that flows through HELP. He also held positions in UnitedHealth Group ($UNH) and Abbott Laboratories ($ABT), both of which are regularly subject to legislation moving through the same committee.

The consistent pattern across all three of his major committee assignments — Armed Services, Energy, HELP — is that sectors those committees regulate are represented in his disclosed portfolio. Whether that reflects the choices of a politically engaged investor who understands those industries, or something structurally more problematic, is the central question that the STOCK Act debate has never fully resolved.

Mullin's position on the congressional trading ban

Mullin has not been a prominent advocate for the congressional stock trading ban. He has not co-sponsored the Stop Insider Trading Act or the Restore Trust in Congress Act — the two leading bipartisan bills that would prohibit senators from holding individual equities while in office. This is consistent with the broader pattern: the senators who trade most actively and whose committee assignments create the greatest overlap with their disclosed portfolios tend to be the quietest on reform.

His 2023 confrontation with Sean O'Brien generated enormous attention for Mullin as a personality. His stock trading record has attracted far less. The two tell different stories — one of a combative, high-profile politician, the other of a quietly active investor with committee access to three market-relevant policy domains simultaneously.

What the full record shows

Mullin's STOCK Act record spans dozens of disclosed trades across individual stocks and ETFs, with positions in energy commodities, defense-adjacent technology, healthcare, financial services, and education. The dollar amounts are substantial by Senate standards — his $250,000+ Microsoft purchase and his pair of $250,000+ commodity ETF buys are among the larger disclosed trades in the Capitol Gains dataset.

His buy-to-sell ratio runs roughly 40/60 — more sells than buys in the indexed data — and his most active trading periods correspond to windows of significant market volatility: post-election positioning in late 2025 and the tariff shock of April 2025.

The Capitol Gains senator leaderboard scores every senator's disclosed buy trades against the S&P 500 over the same period. Whether Mullin's picks have systematically outperformed a passive benchmark — particularly in the sectors his committees oversee — is one of the most direct empirical questions the data can answer. You can view the full, real-time Markwayne Mullin STOCK Act filing history on Capitol Gains, updated as new PTR disclosures are filed.

This article is for informational purposes only. All trade data is sourced from public STOCK Act PTR filings available via the US Senate Financial Disclosure portal. Inclusion of any senator's name does not imply wrongdoing or illegal conduct. Nothing here constitutes legal or financial advice.