WASHINGTON (AP) — The Securities and Exchange Commission waited until Wednesday to disclose a hack of its corporate filing system that occurred last year. The disclosure raises questions about the agency's ability to protect important financial information and comes as Americans are still weighing the consequences of the massive hack at Equifax. The SEC, the federal agency responsible for protecting investors and ensuring markets function properly, is under fire after disclosing the hack of its electronic network that whisks company news and data to investors.