(The Center Square) -- One of Congress’ richest members has been the least likely recently to comply with a 2012 federal law on disclosing stock trades , an investigation by The Center Square found.

U.S. Sen. Markwayne Mullin, an Oklahoma Republican, has blown past more deadlines to report his dealings than any lawmaker since Dec. 31, according to third-party websites that track members’ trades. The law requires members of Congress to file what is known as a periodic transaction report within 30 days of being notified or 45 days of the sale or purchase of stock , bonds, and other securities worth more than $1,000 . Sen. Mullin has filed t hree reports since Dec. 31

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