Ostrow Reisin Berk & Abrams, Ltd.

What Ostrow Reisin Berk & Abrams, Ltd. does

Ostrow Reisin Berk & Abrams, Ltd. (ORBA) is a Chicago-headquartered certified public accounting and financial advisory firm founded in 1977. It delivers three integrated service lines — Accounting Services (financial statement preparation, audit support, general ledger management), Tax Services (planning, preparation, and compliance), and Advisory Services (business consulting and strategic guidance) — to a shared client base of entrepreneurs, privately held companies, nonprofit organizations, and high-net-worth individuals, with industry focus areas spanning manufacturing, professional services, sports & entertainment, and real estate. Service delivery is partner-led, drawing on 15 partners and more than 150 professionals from offices in Chicago (downtown headquarters), Oak Brook, Illinois, and Salt Lake City, Utah.

The firm's products are organized as a single coordinated practice rather than discrete modules; accounting, tax, and advisory work flows are delivered through the same engagement teams to the same client relationships. Core technology and tooling are not publicly disclosed, and there is no proprietary platform or productized software offering; the firm's competitive proposition rests on partner-led expertise, industry specialization, and long-tenured client relationships rather than technology differentiation.

ORBA generates revenue on a fee-for-service basis typical of professional services firms, with engagements scoped and priced per client. Growth is driven primarily by client referrals and word-of-mouth within the Midwest business community, with no disclosed pricing model or productized offering. On September 4, 2025, ORBA entered an agreement to sell substantially all assets to Citrin Cooperman Advisors LLC (non-attest) and Citrin Cooperman & Company, LLP (attest) under an alternative practice structure, with closing expected in October 2025; Koltin Consulting Group served as exclusive financial advisor to the transaction.

Name

Ostrow Reisin Berk & Abrams, Ltd.

Legal name

Ostrow Reisin Berk & Abrams, Ltd.

Website

https://orba.com

Company type

Private

Founded year

1977

Operating status

Acquired

Headcount range

101–250 employees

Short description

Ostrow Reisin Berk & Abrams, Ltd. (ORBA) is a Chicago-based certified public accounting and advisory firm providing tax, accounting, and advisory services to entrepreneurs, privately held companies, nonprofit organizations, and high-net-worth individuals across the Midwest.

Ownership category

akta.pro rank

Headquarters

HQ city

Chicago

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services Fees: Revenue generated from providing tax, accounting, and advisory services to clients. Services are billed on a fee-for-service basis, typical for accounting and advisory firms serving privately held businesses and high-net-worth individuals.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Ostrow Reisin Berk & Abrams, Ltd. (ORBA) is a Chicago-based certified public accounting and financial advisory firm delivering tax, accounting, and advisory services to privately held businesses, nonprofit organizations, entrepreneurs, and high-net-worth individuals. The firm operates as a single integrated practice, with all three service lines delivered through partner-led teams across offices in Chicago, Oak Brook (IL), and Salt Lake City (UT).

Product overview

Ostrow Reisin Berk & Abrams, Ltd. (ORBA) is a professional services firm offering a unified portfolio of accounting, tax, and advisory services. The firm operates as a single-service practice rather than a platform-plus-modules architecture. All three service lines—Accounting Services, Tax Services, and Advisory Services—share a common client base of privately held businesses, nonprofit organizations, entrepreneurs, and high-net-worth individuals, and are delivered through the same team of 15 partners and over 150 professionals across offices in Chicago, Oak Brook, IL, and Salt Lake City, UT. The services are designed to work together as an integrated offering rather than as standalone modules.

Differentiator

Problem solved

Functional benefit

Products and services

• Accounting Services
• Tax Services
• Advisory Services

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Two partnerships are on record, tiered core and minor.

• Citrin Cooperman Advisors LLCcoreStrategic or Co-development Partner · 4 September 2025Citrin Cooperman has entered into an agreement to acquire substantially all assets of ORBA. The transaction consists of Citrin Cooperman Advisors LLC acquiring certain non-attest assets and Citrin Cooperman & Company, LLP acquiring certain attest assets of ORBA. Expected to close in October 2025. ORBA joins with 15 partners and over 150 professionals, significantly expanding Citrin Cooperman's Midwest presence.
• Koltin Consulting GroupminorImplementation/ SI/ Consulting Partner · 4 September 2025Allan Koltin, CEO of Koltin Consulting Group, advised both firms on the transaction. Koltin Consulting Group served as the exclusive financial advisor facilitating the acquisition deal between ORBA and Citrin Cooperman.

Scale indicators3 records

Recent moves4 records

Expansion highlights3 records

Direct peers

• Wipfli LLP: Large regional accounting and advisory firm with strong Midwest roots, serving middle-market private businesses, nonprofits, and healthcare organizations with audit, tax, and consulting services — comparable scale and client base to ORBA.
• Sikich LLP: Chicago-headquartered accounting and advisory firm providing tax, audit, technology, and advisory services to privately held middle-market companies and nonprofits — directly comparable in geography, service mix, and target client profile.
• Crowe LLP: Top-10 U.S. accounting and advisory firm with significant Chicago-area presence, serving mid-market private companies, financial services, and government/nonprofit clients with audit, tax, and advisory services — closely comparable in service mix and target segments.
• Baker Tilly US: Top-10 U.S. advisory, tax, and assurance firm with major Midwest operations, serving privately held businesses, nonprofits, and HNW clients — comparable positioning in size, service breadth, and target segments.
• Marcum LLP: Top-15 U.S. accounting and advisory firm with a strong concentration in the Northeast and Midwest, serving closely held businesses, family offices, nonprofits, and HNW individuals — directly comparable in mid-market private-company focus.
• Plante Moran: One of the largest U.S. certified public accounting and business advisory firms, headquartered in the Midwest (Michigan) with deep practice serving privately held businesses, nonprofits, and high-net-worth individuals — directly comparable to ORBA in size, geography, and target client segments.

Broad incumbents

• BDO USA: Top-5 global accounting network member serving U.S. middle-market private businesses, nonprofits, and HNW clients — broader scale and capabilities but operating in the same competitive set for ORBA's client base.
• RSM US LLP: Top-5 U.S. accounting and advisory firm headquartered in Chicago with global reach, serving middle-market private businesses across industries with audit, tax, and consulting — significantly larger but operating in the same Chicago private-business market.
• Grant Thornton Advisors LLC: U.S. member firm of a global Top-7 audit and advisory network, with strong Midwest presence serving private mid-market companies and high-net-worth individuals — broader portfolio and scale than ORBA, overlapping in core service lines.

Others

• Citrin Cooperman: The acquiring Top-25 national advisory firm buying ORBA's non-attest and attest assets. Included as the immediate acquirer and post-close parent context, not as a direct competitor given its larger footprint and broader services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/ORBAAccounting
• Facebookfacebook.com/ORBAAccounting

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Ostrow Reisin Berk & Abrams, Ltd.