Armanino, known for its leadership in AI-driven innovation, announced the addition of MSTiller (MST), a premier Southeast-focused accounting firm. The move strengthens Armanino’s presence in one of the nation’s fastest growing regions while expanding its capabilities across tax, audit, and advisory services.

MST, founded in 1956, has built a longstanding reputation for serving middle market organizations, family-owned businesses, and private foundations. With approximately 110 professionals across offices in Georgia and New York, the firm brings deep technical expertise and enduring client relationships to the Armanino organization.

The integration enhances Armanino’s ability to support clients navigating increasingly complex regulatory, operational, and transactional challenges. MST clients will continue working with their existing teams while gaining access to Armanino’s national resources, including advanced technology consulting, digital transformation capabilities, and specialized tax services such as multi-state planning, international tax, transfer pricing, valuations, tax credits and incentives, and transaction advisory support.

The alignment builds on decades of collaboration between the two organizations through the Moore Global network. MST’s strong regional presence and long-standing client trust, combined with Armanino’s scale and technology-forward approach, create an expanded platform designed to meet evolving client needs.

Armanino continues to prioritize growth in the Southeast, and the addition of MST further solidifies the firm’s regional strategy while extending its national reach.