Two U.S. Supreme Court justices owned stock in tech vendors or other companies that filed briefs in cases under review by the high court in the past year, a watchdog group said Thursday.

The justices’ ownership of stock in three companies that filed amicus, or friend of the court, briefs in Supreme Court cases during the past year represent a “minefield of potential conflicts of interest and ethical problems” that could damage the court’s reputation, said Fix the Court, a group advocating for more transparency at the court.

Chief Justice John Roberts owned up to US $750,000 in shares of Time Warner and its subsidiaries at the time the media giant filed a brief in ABC v. Aereo, which broadcasters won 6-3 last June, with Roberts in the majority. Aereo was a start-up offering TV service to subscribers through specialized antenna farms.

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