Markwayne Mullin bought Thermo Fisher Scientific Inc (NYSE: TMO)
Markwayne Mullin (R-OK), a U.S. Senator, has disclosed 4 trades in Thermo Fisher Scientific Inc (TMO) since 2023, 3 purchases and 1 sale, worth an estimated $173K in disclosed volume (the midpoint of the dollar ranges members report, not exact amounts).
The trade highlighted here is a purchase: Markwayne Mullin bought $15,001 - $50,000 of Thermo Fisher Scientific Inc (NYSE: TMO) on September 13, 2023. Since that trade, TMO is up +13.81% against the S&P 500 up +69.14%, an outperformance of -55.34%.
Across these filings, Markwayne Mullin has been a net buyer of TMO (a buy-to-sell ratio of 3.00). The most recent disclosed TMO transaction shown was dated May 13, 2025. Each row in the table below links to that trade and its post-trade performance versus the market.
Data updated
Markwayne Mullin's TMO trades vs the price
TMO is up +13.81% since Markwayne Mullin bought on September 13, 2023, versus +69.14% for the S&P 500.
Performance since this trade
All Markwayne Mullin TMO trades
| Traded | Type | Size | Return | Est. profit | |
|---|---|---|---|---|---|
| May 13, 2025 | BUY | $427.38 | +34.88% | +$11K | |
| April 8, 2025 | SELL | $417.77 | +37.98% | — | |
| October 3, 2023 | BUY | $495.67 | +16.30% | +$5K | |
| September 13, 2023 | BUY | $506.53 | +13.81% | +$4K |
Estimated profit is shown for buys only, marked to the latest close. It is an estimate and does not net later sells, taxes, or fees.
Markwayne Mullin & TMO trading FAQ
Is it legal for Markwayne Mullin to trade Thermo Fisher Scientific Inc (TMO) stock?
Yes. Members of Congress are allowed to trade individual stocks, including Thermo Fisher Scientific Inc (TMO), but the STOCK Act of 2012 requires them to publicly disclose each transaction within 45 days. Quantellect tracks those disclosures; this page does not imply the trade was improper.
When did Markwayne Mullin buy TMO?
Markwayne Mullin disclosed a purchase of $15,001 - $50,000 of Thermo Fisher Scientific Inc (TMO) on September 13, 2023, according to public STOCK Act filings.
How has TMO performed since Markwayne Mullin's trade?
Since Markwayne Mullin bought TMO on September 13, 2023, the stock is up +13.81%, versus +69.14% for the S&P 500 over the same period, an outperformance of -55.34%.
How many times has Markwayne Mullin traded TMO?
Markwayne Mullin has disclosed 4 TMO trades since 2023 (3 purchases and 1 sale). Every disclosed trade is listed on this page.
How soon must members of Congress disclose a trade?
Under the STOCK Act, members of Congress must publicly report a covered transaction within 45 days of the trade. Filings can still be delayed, amended, or contain errors.
Where can I see all congressional TMO trades?
Quantellect tracks every disclosed congressional trade in Thermo Fisher Scientific Inc (TMO) on the Thermo Fisher Scientific Inc congressional trading page, which aggregates filings across all members of Congress.
Markwayne Mullin's TMO tradesAll congressional filings for Thermo Fisher Scientific IncMarkwayne Mullin's full profile
Not investment advice. Congressional trading data is sourced from public STOCK Act disclosures, which are filed with a delay and may contain errors or be revised. Estimated prices and post-trade returns are derived algorithmically from public filings and end-of-day market data and describe historical activity, not a recommendation. Always do your own research and consult a licensed financial advisor before making investment decisions.