WASHINGTON—The chair of the top U.S. securities regulator wants private funds to disclose more information to investors about potential conflicts of interest and the fees they charge, according to congressional testimony published Monday evening. Gary Gensler, chair of the Securities and Exchange Commission (SEC), also wants to impose greater transparency on the corporate bond, municipal bond and asset-backed securities market, which combined are worth about $28 trillion, he wrote in the testimony submitted to the Senate Banking Committee. Gensler will appear before the congressional panel on Tuesday to field questions on his agenda for the regulator. “I believe we can enhance disclosures in this area, better enabling pensions and others investing in these private funds to get the information they need to make investment decisions,” Gensler wrote. In the bond markets, meanwhile, trading data is often insufficient, causing liquidity crunches during times of stress, which was evident during last year’s …