Wayne, Pa.-based IPA 300 firm Stephano Slack LLC (FY24 net revenue of $18.6 million) has received a strategic growth investment from Madison Dearborn Partners, with additional participation from co-investor Norlantic Capital.

The investment will support Stephano Slack’s growth strategy as the firm continues to invest in talent, innovation and expanded service offerings. Founded in 2004, the firm provides tax, audit, outsourced accounting and advisory services to middle-market clients and was recently named one of Accounting Today’s Fastest-Growing Firms of 2026. Stephano Slack will continue to operate under its current leadership team, led by Michael Stephano, CEO and MP, while Jim Brady, former COO of Grant Thornton and a 45-year…