Marcum
Marcum is a former Top 20 US accounting firm, founded in 1951, providing tax, assurance, technology, and financial advisory services to middle-market businesses across specialized verticals including government, automotive, food & beverage, and construction, now part of CBIZ following a 2024 acquisition.
- Company typePrivate
- Founded1951
- HeadquartersNew York, United States
- Headcount1,001–5,000
- GTM typeB2B
- OfferingServices
What Marcum does
Marcum LLP was a Top 20 US accounting firm founded in 1951 by Joseph Marcum in New York City, providing tax, assurance, technology, and financial advisory services to middle-market businesses and government entities. The firm built a multi-regional footprint across the Northeast, New England, Mid-Atlantic, Midwest, and Southeast through a serial acquisition strategy that added specialized practices in construction (McCarthy & Company), automotive and food & beverage (Federman, Lally & Remis), governmental auditing (Powers & Sullivan), and broader Midwestern capabilities (Croskey Lanni) between 2023 and mid-2024.
The firm's revenue model is professional services delivery, with staff billing on hourly rates, fixed fees, and project-based arrangements under quote-based pricing typical of the accounting and advisory sector. Marcum generated revenue primarily through its middle-market client base, with secondary vertical-specific exposure to government, automotive, food & beverage, and construction sectors. Its go-to-market relied on direct partner-led engagement, industry events, professional referral networks, and thought leadership content. Headcount was in the 1001-5000 range at the time of acquisition.
In November 2024, CBIZ, Inc. acquired Marcum for approximately $2.3 billion, with the attest business transitioning to CBIZ CPAs P.C. and the non-attest business integrated into CBIZ's broader platform. The combined entity reported $2.8 billion in 2025 revenue, representing 52% year-over-year growth and establishing CBIZ as the largest full-service professional services advisor for US middle-market businesses. Jeffrey Weiner, Marcum's chairman and CEO, retained the same role in the combined entity.
Marcum firmographics
Firmographics- Name
- Marcum
- Legal name
- CBIZ, Inc.
- Website
- https://marcumllp.com
- Company type
- Private
- Founded year
- 1951
- Operating status
- Acquired
- Headcount range
- 1,001–5,000 employees
- Short description
- Marcum is a former Top 20 US accounting firm, founded in 1951, providing tax, assurance, technology, and financial advisory services to middle-market businesses across specialized verticals including government, automotive, food & beverage, and construction, now part of CBIZ following a 2024 acquisition.
- Ownership category
- akta.pro rank
Marcum industry classification
Industry- Product category
- Public Accounting & Advisory Services
- NAICS
- Offices of Certified Public Accountants (541211), Other Accounting Services (541219)
- akta.pro primary industry
- Purchase Price Allocation (PPA) & Intangible Asset Valuation (FSAEAHAF)
- akta.pro secondary industry
- Trust & Estate Tax Planning & Compliance (FSAEAKAE)
Keywords
Where Marcum is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Offices4 records
Markets served
Marcum business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Professional Services Fees: Accounting, tax, assurance, technology, and financial advisory services delivered through professional staff billing on hourly rates, fixed fees, and project-based arrangements serving middle-market and enterprise clients.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Quote-based professional services |
Go-to-market motion1 record
Distribution channels2 records
Marketing channels3 records
Marcum product offering
Product offeringCore offering
Marcum is a Top 20 U.S. public accounting firm that delivers tax planning and compliance, audit and attest, financial reporting, and a broad suite of advisory services to middle-market businesses and government entities. Industry-specialized practices span government, construction, automotive, and food & beverage clients, while the firm also provides technology consulting, M&A transaction advisory, valuation, and forensic and litigation consulting services.
Product overview
Marcum LLP is a Top 20 accounting firm that operates as a single unified professional services practice offering tax, assurance, technology, and financial advisory services. The firm provides industry-specific services including governmental auditing and consulting, automotive sector services, and food & beverage sector services. Marcum also offers construction practice services. Following its acquisition by CBIZ Inc. in November 2024, Marcum's attest business operates under CBIZ CPAs while the non-attest business was integrated into CBIZ's broader service offerings.
Differentiator
Problem solved
Functional benefit
Products and services
- Tax Services Tax planning, preparation, and compliance services for businesses and individuals, covering business tax, international tax, state and local tax, and specialized tax engagements.
- Assurance Services Audit, attest, and financial reporting services providing independent verification of financial statements and internal controls for middle-market and government clients.
- Technology Services Technology advisory and consulting services covering AI, cloud and infrastructure, cybersecurity, managed services, and enterprise performance and technology transformation.
- Financial Advisory Services Strategic financial consulting and advisory services for business growth and optimization, including M&A transaction advisory, valuation, forensic and litigation consulting, private equity advisory, and risk management.
- Governmental Auditing and Consulting Specialized auditing and consulting services for government entities and public sector organizations, delivered through the Powers & Sullivan practice.
- Automotive Sector Services Tax and assurance services tailored for automotive sector businesses, particularly dealers in the New England region.
- Food & Beverage Sector Services Financial, tax, and compliance services tailored for food and beverage sector businesses.
- Construction Practice Services Accounting, tax, and advisory services specialized for construction industry clients, including revenue recognition, percentage-of-completion accounting, and construction tax credits.
Companies that use Marcum
Customer profileNamed customers4 records
Segments5 records
Ideal customer profiles5 records
Marcum technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Marcum partnerships and signals
Strategic signalScale indicators3 records
Recent moves6 records
Expansion highlights5 records
Marcum competitors and assessment
Company assessmentEmerging players
- Withum: Fast-growing US accounting and advisory firm targeting middle-market and entrepreneurial clients; comparable service mix but smaller scale than Marcum, positioning it as a peer in the same competitive set.
Direct peers
- BDO USA: Top-10 US accounting and advisory firm with a strong middle-market focus across tax, audit, and advisory services — directly comparable to Marcum in client segment, service mix, and acquisition-led growth strategy.
- RSM US: Leading US middle-market accounting and consulting firm offering audit, tax, and consulting services; competes head-to-head with Marcum for middle-market engagements and shares the same growth-by-acquisition playbook.
- Crowe LLP: Top-15 US public accounting and advisory firm focused on middle-market and privately-held businesses with audit, tax, and consulting practices — directly comparable in scale, client profile, and service breadth.
- Plante Moran: Large US accounting and business advisory firm serving middle-market clients across multiple industries; comparable to Marcum in service mix, industry specialization, and middle-market positioning.
- Eide Bailly: Top-25 US accounting and advisory firm with strong middle-market and industry-specialized practices; comparable to Marcum in client segment and full-service offerings.
- Grant Thornton: Major US accounting firm serving middle-market and privately-held businesses with audit, tax, and advisory services; comparable to Marcum in target client size and full-service model.
Broad incumbents
- Deloitte US: Big 4 firm with comprehensive audit, tax, and advisory services that increasingly targets middle-market clients; broader and more diversified than Marcum but overlaps on enterprise advisory and transaction work.
- KPMG US: Big 4 firm offering audit, tax, and advisory services with growing middle-market practice; overlaps with Marcum on tax, advisory, and transaction services but operates at materially greater scale and global reach.
Regional players
- Baker Newman Noyes: Northeast US-based accounting and consulting firm serving middle-market and privately-held businesses; comparable to Marcum in service offerings and regional client base but smaller in scale.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Marcum social profiles
Digital presenceMarcum financial estimates
Financial estimateRevenue estimate
Valuation estimate
Marcum leadership team
Management profileNumber of profiles
Profiles3 records
Marcum subsidiaries and ownership
Company hierarchySubsidiaries4 records
Marcum funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Marcum M&A and investment
M&A and investmentM&A12 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Marcum
What does Marcum do?
Marcum is a Top 20 U.S. public accounting firm that delivers tax planning and compliance, audit and attest, financial reporting, and a broad suite of advisory services to middle-market businesses and government entities. Industry-specialized practices span government, construction, automotive, and food & beverage clients, while the firm also provides technology consulting, M&A transaction advisory, valuation, and forensic and litigation consulting services.
Is Marcum a public or private company?
Marcum is a private company. It is classified as public and is currently acquired.
When was Marcum founded?
Marcum was founded in 1951. It employs 1,001 to 5,000 people.
Where is Marcum based?
Marcum is headquartered in New York, United States, in the North America region.
How does Marcum make money?
One revenue line is on record: professional Services Fees.
Who are Marcum's main competitors?
Withum is listed as an emerging player. Direct peers are BDO USA, RSM US, Crowe LLP, Plante Moran, Eide Bailly and Grant Thornton. Broad incumbents are Deloitte US and KPMG US. Baker Newman Noyes is listed as a regional player.
Does Marcum have an API?
No public API is recorded for Marcum.
What industry is Marcum in?
Marcum's product category is Public Accounting & Advisory Services. Its primary akta.pro industry code is FSAEAHAF, Purchase Price Allocation (PPA) & Intangible Asset Valuation, with a secondary code of FSAEAKAE, Trust & Estate Tax Planning & Compliance. Its NAICS code is 541211.