House Oversight Committee Chairman James Comer is calling for additional regulation of government officials’ prediction-market trading, including a possible blanket ban, amid concerns that insiders used nonpublic information to profit on platforms including Kalshi and Polymarket. A staff memorandum released Friday detailed an investigation into alleged insider trading by government officials, military personnel and people holding security clearances. The House Committee on Oversight and Government Reform recommended that Congress consider measures ranging from an outright ban for covered personnel to narrower restrictions on contracts linked to government decisions. Comer said further reforms are needed to prevent corruption among public officials and restore public confidence in government. The inquiry, launched in May, reviewed nearly 1,700 pages of documents and communications and included five bipartisan staff briefings with prediction-market platforms. The memorandum said the Commodity Exchange Act, as amended by the STOCK Act, already bars federal employees and lawmakers from using nonpublic information obtained through their positions to trade commodity futures, options or swaps. The committee said platforms detected and reported most alleged incidents, citing Polymarket’s PolyGraph surveillance system, developed with Chainalysis, and Kalshi’s strengthened monitoring procedures. The investigation included a U.S. soldier charged in April over alleged trading tied to the military operation that led to the capture of Venezuelan President Nicolás Maduro and a former White House teleprompter operator fined by the CFTC in August over bets on presidential speeches. The scrutiny comes as the CFTC seeks greater authority over prediction markets and Sen. Elizabeth Warren prepares to become Senate Banking chair.