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EisnerAmper

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EisnerAmper is a large US accounting, tax and advisory firm serving businesses, nonprofits and high-net-worth individuals.

Last updated October 30, 2026

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Overview

EisnerAmper is one of the larger accounting, tax and business-advisory firms in the United States, operating as a limited liability partnership with its principal office in New York City. The firm traces its roots to the separate practices of Eisner & Company and Amper, Politziner & Mattia, which combined in the early 2010s to form the EisnerAmper brand. It provides audit and assurance, tax compliance and planning, and a broad advisory practice covering transactions, risk, technology, forensic and valuation work, plus wealth-management services for private clients. The firm's client base spans privately held and middle-market companies, public companies, not-for-profit organizations, financial-services firms and high-net-worth families. EisnerAmper has grown substantially through lateral team hires and acquisitions of regional accounting practices, expanding from its New York and New Jersey base into markets across the United States. It also participates in an international network, EisnerAmper Global, that connects member firms in several countries so that clients with cross-border needs can be served. As a private partnership, EisnerAmper does not trade on a stock exchange and does not publish quarterly results; its scale is usually described through headcount and ranking among US accounting firms. The firm is known for a strong not-for-profit and financial-services practice and for a culture built around partner-led client service. Its brand positioning emphasizes being large enough to handle complex, multi-disciplinary engagements while remaining accessible and relationship-driven compared with the Big Four.

History

EisnerAmper's history is the story of two New York-area accounting practices that grew separately and then merged to build a larger regional and national platform. Eisner & Company was a New York City firm known for serving financial-services clients and high-net-worth individuals, while Amper, Politziner & Mattia was a New Jersey-based practice with a strong audit and not-for-profit base. In the early 2010s the two firms combined their operations under the EisnerAmper name, creating one of the larger accounting and advisory firms in the New York metropolitan area. After the combination, EisnerAmper pursued an expansion strategy built on lateral partner and team hires and on acquisitions of regional firms, extending its footprint beyond New York and New Jersey into other US markets. The firm also developed an international dimension through EisnerAmper Global, a network of independent member firms in several countries that allows it to support clients with cross-border operations. EisnerAmper has consistently ranked among the largest accounting firms in the United States by revenue and headcount, and it has built recognized practices in areas such as not-for-profit organizations, financial services, private equity and alternative investments, and private-client wealth services. As a private partnership it does not disclose public financial statements, and its growth has been funded internally and through partner admissions rather than public markets.

  • Eisner & Company and Amper, Politziner & Mattia combine operations under the EisnerAmper name.

  • EisnerAmper Global network established to serve cross-border clients through member firms.

Products and positioning

A large, partner-led US accounting and advisory firm positioned between the Big Four and smaller regional practices, strong in middle-market, not-for-profit and financial-services work.

  • Audit and assurance

  • Tax compliance and planning

  • Transaction advisory

  • Risk and compliance

  • Forensic accounting and valuation

  • Wealth management

Recent events

  • Reported

    EisnerAmper launches EisnerAmper Digital[2]

    EisnerAmper announced the launch of EisnerAmper Digital, formerly Process, Risk & Technology Solutions, bringing its risk advisory, digital and cybersecurity experts together under the new name.

  • Reported

    EisnerAmper and Redirect form strategic alliance[3]

    EisnerAmper formed a strategic alliance with Redirect. The firms plan to combine business advisory and technology capabilities for real estate clients, with EisnerAmper providing internal controls and financial systems expertise and Redirect providing real estate software implementation, optimization and support.

  • Unconfirmed

    Reported

    EisnerAmper merges in Imowitz Koenig and RESIG[4]

    EisnerAmper merged in Imowitz Koenig & Co., LLP and its affiliated real estate fund advisory firm, Real Estate Systems Implementation Group LLC (RESIG). Fourteen partners and staff from the affiliated firms joined EisnerAmper; financial terms were not disclosed.

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