Armanino acquired MSTiller, expanding the Top 25 Firm's presence in the Southeast.
MST, based in Atlanta, advises middle-market organizations, family-owned businesses and private foundations across a range of industries, including automotive dealerships, construction, hospitality, medical practices and real estate development. The firm has 10 partners and roughly 110 employees across four offices in Atlanta, Brunswick and Duluth, Georgia, and White Plains, New York.
"MST is an exceptional firm with a strong reputation, talented professionals, and trusted client relationships that have proven the test of time," Matt Armanino, CEO of Armanino Advisory, said in a statement. "As client needs become more complex, it's critical that firms have the depth, scale and specialized expertise to keep pace. MST strengthens our ability to deliver our services with an incredible focus on client outcomes while deepening our presence in one of the fastest-growing regions of the U.S."
Armanino is based in San Ramon, California, and ranked No. 18 on Accounting Today's 2025 Top 100 Firms list, reporting $716 million in revenue, with 262 partners and roughly 2,700 employees across 22 offices. It took a minority investment from
The firm has made a number of acquisitions through 2025, and most recently added
"Armanino stood out because of its culture, foresight and a trusted relationship built over decades," Angela Griner, managing partner of MST, said in a statement. "Our long history of working alongside Armanino through the Moore Global network, combined with their commitment to technology, AI and modern service delivery, gave us confidence that we can better serve increasingly complex client needs while maintaining the core values of our firm that have defined us since our founding."
