MMB+CO

What MMB+CO does

MMB+CO is a privately held certified public accounting and advisory firm headquartered in Fairport, New York (Greater Rochester), operating five offices across the state in Rochester/Fairport, Elmira, Canandaigua, Latham (Albany area), and Queensbury. Founded in 1975, the firm provides a full-service portfolio organized into four lines: Tax Services (corporate, multi-state, international, trust, estate, R&D and specialty credits, and individual), Assurance and Audit (financial audits, reviews, compilations, employee benefit plans, single audits, GIPS, FAR, collateral, internal, compliance, and surprise custody examinations), Client Advisory Services (business valuation, client accounting, cost segregation, IT advisory, transaction advisory), and IT Services (risk assessment, vulnerability scanning, penetration testing, cyber compliance, vendor due diligence, IT user awareness training).

The firm serves horizontally diversified clients including privately held mid-market companies, small businesses and startups, tax-exempt organizations, governmental entities, financial institutions, high-net-worth individuals, public companies, and educational institutions across New York State. MMB+CO operates as an independent member of BDO's international accounting network and grows primarily through strategic mergers and organic expansion rather than external capital. It markets via thought leadership (Rochester Business Journal columns, TV appearances on 13WHAM, WXXI, CBS, News10), content marketing, community engagement, and direct relationship-based sales with engagement-based pricing negotiated per engagement.

Business operations are run on standard professional-services tooling including a ClientAxcess client portal, SafeSend secure document transfer, and QuickFee for client payments. The firm employs 51–100 staff and has been recognized as a Times Union Top Workplace for 13 consecutive years and a Best Legacy Business in Rochester, with multiple partners named to Forbes' Best-in-State CPAs list.

Name

MMB+CO

Legal name

MMB+CO

Website

https://mmbaccounting.com

Company type

Private

Founded year

1975

Operating status

Operating

Headcount range

51–100 employees

Short description

MMB+CO is a privately held, full-service CPA and advisory firm founded in 1975, operating five offices across New York State and serving mid-market businesses, nonprofits, government entities, and individuals with tax, audit, advisory, and IT/cybersecurity services.

Ownership category

akta.pro rank

Product category

Accounting and Advisory Services

akta.pro industry

PRIMARYBPAHAFAD

Internal Audit & SOX/ICFR Advisory

Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Risk, Compliance & Governance Advisory

Keywords

• Tax preparation services
• Accounting advisory
• Audit assurance
• Bookkeeping services
• Financial consulting

Headquarters

HQ city

Fairport

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Professional Services (Tax, Assurance, Audit, Advisory): MMB+CO generates revenue through a broad range of professional services including tax planning and compliance (corporate, multi-state, international, individual), assurance and audit services (financial audit/review/compilation, employee benefit plans, single audits, FAR audits, GIPS audits, agreed-upon procedures, collateral audits, internal audits, compliance audits, surprise custody examinations), client advisory services (business valuation, client accounting services, cost segregation, IT advisory, transaction advisory), and IT services (risk assessment, vulnerability scanning, penetration testing, cyber compliance, vendor due diligence, IT user awareness training). The firm also serves specialized sectors such as trust accounting, estate tax planning, and R&D and specialty tax credit studies.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels7 records

Core offering

MMB+CO is a New York State accounting and advisory firm providing tax preparation and planning, assurance and audit, client advisory, and IT risk/compliance services to privately held companies, nonprofits, government entities, financial institutions, and individuals. The firm operates across five New York State offices with a team-based engagement model spanning the full business lifecycle from tax compliance to transaction advisory.

Product overview

MMB+CO is a full-service accounting and advisory firm offering a unified portfolio of professional services. The core offering consists of Tax Services (corporate, multi-state, international, trust, estate, R&D credits, and individual tax), Assurance and Audit Services (financial audits, reviews, compilations, and specialized audits), Client Advisory Services (business valuation, accounting, cost segregation, IT advisory, transaction advisory), and IT Services (risk assessment, vulnerability scanning, penetration testing, cyber compliance). These service lines work together to provide comprehensive financial guidance for businesses and individuals throughout New York State.

Differentiator

Problem solved

Functional benefit

Products and services

• Tax Services Comprehensive tax preparation, planning, and advisory services including corporate tax, multi-state tax, international tax, trust accounting, estate tax planning, R&D and specialty tax credit studies, and individual tax services for businesses and individuals.
• Assurance and Audit Services Independent audit, review, and compilation services along with specialized audits including employee benefit plans, single audits, GIPS compliance, FAR audits, agreed-upon procedures, collateral audits, internal audits, compliance audits, and surprise custody examinations.
• Client Advisory Services Advisory offerings including business valuation services, client accounting services, cost segregation studies, IT advisory services, and transaction advisory.
• IT Services Technology-focused services including risk assessment, vulnerability scanning, penetration testing, cyber compliance, vendor due diligence, and IT user awareness training.

Named customers9 records

Segments8 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• BDOcoreOthersMMB+CO is an independent member of BDO's network of independently structured professional associations. BDO is an international accounting network providing association and support services to independently structured professional services firms. This affiliation provides MMB+CO with access to a global network of resources, methodologies, and professional development while maintaining its independence.

Scale indicators3 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Eide Bailly: Top-25 U.S. CPA firm with regional roots serving mid-market clients in tax, audit, and advisory. Comparable firm profile, partnership culture, and growth orientation through mergers.
• Withum: Top-20 U.S. accounting and advisory firm with strong Mid-Atlantic and Northeast presence serving mid-market and closely-held companies. Similar client mix and growth strategy via M&A consolidation of regional firms.
• The Bonadio Group: Rochester-headquartered CPA and advisory firm of comparable size serving closely-held and mid-market businesses across New York State with tax, audit, and advisory services. Direct competitor for the same Upstate NY client base and talent pool.
• Mengel Metzger Barr & Co. Rochester, NY regional accounting and advisory firm offering tax, audit, and business advisory to mid-market clients in Upstate New York. Same geographic market and service line competition.
• Freed Maxick: Buffalo-headquartered full-service CPA and advisory firm serving Western and Upstate New York with tax, audit, and consulting services. Comparable size, scope, and Upstate NY market overlap.
• Insero & Co. Rochester, NY-based certified public accounting firm providing audit, tax, and advisory services to closely held businesses, nonprofits, and individuals. Direct overlap in geography, service mix, and target client profile.

Broad incumbents

• BDO USA: U.S. member firm of the BDO global network, of which MMB+CO is an independent member affiliate. Competes for mid-market audit and advisory work in NY while providing international scale that MMB+CO accesses via association.
• Marcum LLP: Top-15 U.S. accounting firm providing tax, audit, advisory, and technology services to mid-market and large clients nationally. Aggressive acquirer of regional firms, representing both competitive pressure and a potential strategic acquirer profile.
• CliftonLarsonAllen (CLA): Top-10 U.S. accounting and advisory firm serving mid-market businesses, nonprofits, and individuals. Direct competition in the same client size tier with substantially greater geographic coverage and resources.

Regional players

• BST: Albany/New York-based accounting and advisory firm providing tax, audit, and consulting services to closely-held businesses and nonprofits in the Capital Region. Geographic overlap with MMB+CO's Latham office.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/MMBandCO
• LinkedInlinkedin.com/company/mmbandco
• Instagraminstagram.com/mmbandco

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about MMB+CO