The 2026 Fastest-Growing Firms

Growth remains strong among the country's biggest accounting firms, with private equity turbo-charging a lot of it.

Of the 25 fastest-growing firms in Accounting Today's Top 100 Firms and Regional Leaders Report, only four have no connection to PE, with the rest all having taken PE investment, become part of a PE-backed firm platform, or sprung into existence as a combination of PE-owned firms.

Among all the firms in the report, 41% reported double-digit growth, down somewhat from 47% in last year's report, but still more than respectable, while 42 individual firms reported growth above 20%.

There are plenty of spectacular outliers at the top of the Fastest-Growing Firms list — which combines the Top 100, the Regional Leaders, and our annual "Ones to Watch" list — starting with Alan & James Partners' 332% growth rate, and Richey May's 200%. Meanwhile, Baker Tilly nearly doubled in size thanks to its merger with Moss Adams, and a total of nine other firms reported growth above 50%.

The fastest-growing firms are shown below, ranked by their growth rate. (See our full 2026 Top 100 Firms and Regional Leaders list here.)