WASHINGTON— A week before he voted to significantly cut Medicaid, Rep. Rob Bresnahan dumped six figures’ worth of stock in a quartet of companies that manage nearly half of all Medicaid enrollees in the country, according to public disclosure documents reviewed by NBC News.

Bresnahan, R-Pa., who became one of the most prolific stock traders in Congress after he took office this year, offloaded up to $130,000 worth of stock in Centene , Elevance Health , UnitedHealth and CVS Health on May 15, the periodic transaction reports he filed with the House clerk in June show. Taken together, those four companies oversee roughly half of all Medicaid managed care organizations, according to the KFF, a health policy research organization .

Seven days later, on May 22, the House took its fi

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