More than a dozen private equity firms have revised their regulatory filings amid pressure from federal securities regulators, publicly disclosing for the first time some fees and expenses charged to public pension funds and other investing clients.

The new disclosures-made in unusual midyear revisions to documents required to be filed annually by investment advisers-cover an array of buyout-firm practices that the Securities and Exchange Commission has scrutinised over the past six months. Among those revising their disclosures are large publicly traded investment shops such as Apollo Global Management and KKR.