About two-thirds of the Top 100 accounting firms report increased growth in their business valuation services, according to the 2015 Top 100 firms survey by Accounting Today (free registration required). BV is No. 6 in the rankings of the fastest-growing niche services.

Attest, M&A top list: The widest growth is reported in attest services and mergers and acquisitions, which hold the top two spots on the list, respectively. The jump in attest work can be attributed to the growing number of companies providing outsourced control-based services. A hot transactional market and the wave of baby boomers retiring and looking for exit strategies fueled the growth in M&A services.

Rounding out the top 10 are state and local taxes, industry specializations, international tax, litigation support, nonprofit organizations, estate/trust/gift tax planning, and forensics/fraud.