GOP Sen Markwayne Mullin violated Stock Act, failed to report hundred of thousands in trades

A Mullin spokesperson said the senator uses an independent, third-party operator firm that manages all stock portfolio investments on his behalf.

Published: August 1, 2025 8:42am

Oklahoma Republican Sen. Markwayne Mullin has filed a disclosure with the Senate that shows he failed to properly disclose hundreds of thousands of dollars in stock trades on time.

The disclosure filed Wednesday shows he was two-and-a-half years late on reporting seven stock purchases by his wife and about one-and-a-half years late disclosing three Oklahoma-connected municipal security purchases for himself, according to the news outlet NOTUS.

The Stop Trading on Congressional Knowledge Act, or STOCK Act, requires Congress members to disclose any stock, bond, or cryptocurrency trade made by themselves, spouse, or dependent child within 45 days.

“Much like tax returns, financial disclosures occasionally need to be amended to reflect the most accurate, up-to-date information. That’s what we did here,” a Mullin spokesperson told NOTUS.

The spokesperson also said the senator uses an independent, third-party operator firm that manages all stock portfolio investments on his behalf and that he neither conducts nor informs trades. 

The firm also reports bi-weekly to a Senate ethics panel to ensure compliance with federal law,” the spokesperson also said.

The spokesperson did not answer questions about whether Mullin has paid the standard $200 fine or been in contact with the Senate Select Committee on Ethics, which oversees STOCK Act enforcement.

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