Armanino, the San Ramon-based accounting firm ranked 18th on Accounting Today's 2025 Top 100 Firms list, has acquired MSTiller to expand its presence in the Southeast. The acquisition adds 10 partners and approximately 110 employees across four offices. MSTiller advises middle-market organisations, family-owned businesses and private foundations across industries including automotive dealerships, construction, hospitality and real estate development. The firm had a longstanding relationship with Armanino through the Moore Global network. Armanino reported $716 million in revenue with 262 partners and roughly 2,700 employees across 22 offices. The firm took a minority investment from Further Global Capital Management in October 2024 and recently acquired Step Up Consulting in February 2026.

Armanino expands tax, audit and advisory services with addition of MSTiller.

Armanino, one of the 20 largest accounting firms in the US, has partnered with Inflo to build an AI-enabled digital audit platform. The integration will enhance Armanino's Audit Ally and Armanino Access ecosystem, providing clients with real-time visibility into audit progress and deeper business insights. The platform incorporates AI capabilities including intelligent risk identification, anomaly detection, and automated documentation support whilst maintaining professional oversight. Clients can securely connect their ERP systems directly to the platform, reducing manual document preparation time and enabling ongoing testing. Armanino's partnership with Inflo represents a significant investment in technology aimed at improving client experience and audit quality. Inflo, founded in 2015, serves over 430,000 accountants across 113 countries with its digital audit platform.