MSTiller, an accounting firm with three offices in Georgia and one in New York state, has joined Armanino, expanding the top 20 firm’s presence in the Southeast.
Financial terms of the deal weren’t disclosed.
This latest M&A deal is San Ramon, CA-based Armanino’s third of 2026. The firm also added Sales Tax Defense and Step Up Consulting in January.
Armanino said in October 2024 it had received a minority investment from Further Global Capital Management, a New York-based employee-owned private equity firm that makes investments in businesses within the financial services industry. Armanino said at the time that the investment supports its strategic growth into additional markets, improves the firm’s technology infrastructure, and provides additional resources.
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Armanino officials say the addition of MST brings a deep bench of professionals who share a mutual commitment to serving clients in an increasingly complex business environment.
“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 on March 2. “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.”
Founded in 1956, MST has built a strong reputation advising middle-market organizations, family-owned businesses, and private foundations across a broad range of industries. With approximately 110 professionals across offices in Atlanta, Brunswick, and Duluth in Georgia and White Plains, NY, MST grows Armanino’s presence across the Southeast while adding depth in tax, audit, advisory services, and more.
Like Armanino, MST is a member of the Moore Global network of accounting, audit, and advisory firms.
As a result of the deal, Armanino says MST clients gain access to the full breadth of capabilities a national firm offers, including advanced technology and digital transformation consulting, as well as specialty tax services, such as state and local tax, multistate tax planning, international tax and transfer pricing, valuations, tax credits and incentives, and transaction-related advisory services. Armanino says these offerings will enable MST clients to navigate increasingly complex regulatory, operational, and transactional challenges while continuing to work with the same trusted MST teams.
“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.”
“This is ultimately about better serving clients and providing our team with best-in-class resources,” added Greg Hayes, partner and Gwinnett office leader. “By combining MST’s trusted relationships and regional strength with Armanino’s expanded capabilities, we’re creating an opportunity that allows clients to grow confidently while continuing to work with the advisors they rely on.”
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