Williams Adley
Williams Adley is a privately-held Washington, DC CPA and consulting firm founded in 1982 that provides government auditing, cybersecurity risk, and management consulting services to U.S. federal civilian and defense agencies through GSA contract vehicles.
- Company typePrivate
- Founded1982
- HeadquartersWashington, United States
- Headcount51–100
- GTM typeB2B
- OfferingServices
What Williams Adley does
Williams Adley (legal name Williams, Adley & Company-DC, LLP) is a privately-held, Washington, DC-based certified public accounting and management consulting firm founded in 1982 that specializes exclusively in serving U.S. federal civilian and defense agencies, with secondary exposure to state and local governments. The firm operates three core service lines: Audit and Assurance (financial audits, performance audits, and attestation engagements under GAO Yellow Book), Cybersecurity Risk Services (FISMA, FISCAM, SSAE 18, CMMC advisory, StateRAMP), and Management Consulting (financial management optimization targeting waste, fraud, and abuse in the federal sector).
The firm delivers services through pre-qualified federal contract vehicles including GSA OASIS Small Business Pool 2 (Contract GS00Q18OADS230), GSA Multiple Award Schedule (GS-00F-013DA, October 2025 through October 2030), and the District of Columbia Supply Schedule (CW107121), supplemented by direct Blanket Purchase Agreement awards such as a $150M ceiling award from HHS announced in June 2025. Its go-to-market is enterprise field sales against federal solicitations, often via teaming arrangements with larger primes such as Crowe LLP and specialty subcontractors. Headcount is approximately 100 professional staff (down from a historical 250 at the peak of HUD and FDIC engagements), and the firm is led by Managing Partner Kola Isiaq with a credentialed partner group (CPA, CGFM, CFE, CISA, CISSP, PMP).
Williams Adley firmographics
Firmographics- Name
- Williams Adley
- Legal name
- Williams, Adley & Company-DC, LLP
- Website
- https://williamsadley.com
- Company type
- Private
- Founded year
- 1982
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- Williams Adley is a privately-held Washington, DC CPA and consulting firm founded in 1982 that provides government auditing, cybersecurity risk, and management consulting services to U.S. federal civilian and defense agencies through GSA contract vehicles.
- Ownership category
- akta.pro rank
Williams Adley industry classification
Industry- Product category
- Government Auditing and Consulting Services
- NAICS
- Offices of Certified Public Accountants (541211)
- SIC
- Finance Services (6199), Services-Management Services (8741)
- akta.pro primary industry
- Outsourced Finance & CFO Services (BPAHABAE)
Keywords
Where Williams Adley is headquartered
LocationHeadquarters
- HQ city
- Washington
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Williams Adley business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Audit and Assurance Services: Providing financial audits, performance audits, and attestation engagements for government agencies as defined by GAO's Yellow Book for civilian and defense agencies
- Cybersecurity Risk Services: Cybersecurity audit and advisory services including FISMA assessments, IT general controls, vulnerability assessments, and cybersecurity program development
- Management Consulting: Financial management consulting, process optimization, and advisory services for government clients
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | GSA OASIS Small Business Pool 2 - Financial Services |
Go-to-market motion1 record
Distribution channels4 records
Marketing channels8 records
Williams Adley product offering
Product offeringCore offering
Williams Adley is a CPA and management consulting firm that delivers three core service lines to U.S. federal civilian and defense agencies: Audit and Assurance (financial audits, performance audits, and attestation engagements under GAO Yellow Book), Cybersecurity Risk Services or CRS (FISMA evaluations, FISCAM audits, SSAE 18 examinations, CMMC advisory, and StateRAMP authorizations), and Management Consulting (financial management consulting, process optimization, and audit remediation). Work is performed under government-wide acquisition contract vehicles such as GSA OASIS Small Business Pool 2, GSA MAS, and the DC Supply Schedule.
Product overview
Williams Adley is a professional services firm offering a portfolio of three core service lines: Audit and Assurance (financial audits, performance audits, and attestation engagements per GAO Yellow Book standards), Cybersecurity Risk Services (CRS, formerly ITRM - cybersecurity audits, FISMA evaluations, SSAE 18 examinations, FISCAM audits, CMMC advisory, and StateRAMP services), and Management Consulting (tailored solutions for complex financial problems in the federal sector). The firm serves federal civilian and defense agencies, state and local governments, and select commercial entities. The CRS practice was rebranded from ITRM in January 2024 to better reflect its cybersecurity focus and risk management foundation. The firm also produces the CyberStorm podcast as a thought leadership vehicle for its CRS practice.
Differentiator
Problem solved
Functional benefit
Products and services
- Audit and Assurance Full spectrum of financial audits, performance audits, and attestation engagements conducted under GAO's Yellow Book for federal civilian and defense agencies. Designed to provide value-added perspective and enhance financial management, operations, and accountability.
- Cybersecurity Risk Services (CRS) Cybersecurity audit and advisory services focused on risk management for federal agencies. Helps agencies assess cybersecurity posture, identify vulnerabilities and threats, and develop strategies to minimize and mitigate cyber risks. Encompasses FISMA evaluations, FISCAM audits, SSAE 18 examinations, CMMC advisory, and StateRAMP services.
- Management Consulting Tailored solutions for complex financial problems in the federal sector, focused on efficiency improvements and targeting waste, fraud, and abuse. Strategic advisory and process optimization delivered to federal clients based on long-standing trust relationships.
- FISMA Evaluation Services Federal Information Security Modernization Act (FISMA) audits and evaluations that assess agency cybersecurity programs, report on maturity ratings, and provide recommendations aimed at the root causes of identified weaknesses for federal civilian and defense agencies.
- SSAE 18 Examination Services Service Organization Control (SOC) examinations reviewing service provider systems to ensure compliance for federal clients, including SOC 1 reports for service organizations supporting defense agencies.
- CMMC Advisory Services Cybersecurity Maturity Model Certification advisory services helping Defense Industrial Base organizations achieve and maintain CMMC compliance to protect sensitive defense information from malicious actors.
- FISCAM Audits Federal Information System Controls Audit Manual examinations assessing information technology general controls and application controls for federal agencies.
- StateRAMP Services Cybersecurity assessment and authorization services for cloud service providers seeking StateRAMP authorization to do business with state and local governments.
Quantifiable outcome
- 21st consecutive unmodified audit opinion achieved for DFAS WCF
- +2 more outcomes
Companies that use Williams Adley
Customer profileNamed customers14 records
Segments4 records
Ideal customer profiles4 records
Williams Adley technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Williams Adley partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core.
- Crowe LLPcoreTeaming partner for the $150M HHS Blanket Purchase Agreement. Crowe brings notable expertise and proven track record in Federal contracting to support Williams Adley's service delivery for Department of Health and Human Services accounting and financial management services.
- NextStep Technology, InccoreTeaming partner for the $150M HHS Blanket Purchase Agreement. NextStep Technologies brings technical expertise to support Williams Adley's delivery of comprehensive accounting and financial management services to HHS.
- SummitcoreTeaming partner for the $150M HHS Blanket Purchase Agreement. Summit Consulting provides additional capabilities to support Williams Adley's service delivery for HHS financial management services.
Scale indicators10 records
Recent moves7 records
Expansion highlights6 records
Williams Adley competitors and assessment
Company assessmentDirect peers
- Councilor, Buchanan & Mitchell (CBM): CBM is a Mid-Atlantic CPA firm with a substantial government contracting practice providing audit, tax, and advisory services to federal agencies and government contractors. Directly comparable in size, geography, and service mix to Williams Adley.
- Kearney & Company: Kearney & Company is a direct peer — a CPA and financial management firm exclusively focused on the federal government, with deep DFAS, DoD, and federal civilian audit engagements. Closely comparable in service mix (financial audits, FISMA, advisory) and target customer base to Williams Adley.
- Cotton & Company (BDO USA): Cotton & Company is a leading federal audit and advisory CPA firm (now part of BDO USA) that competes head-to-head with Williams Adley on financial statement audits for federal agencies, OIG engagements, and grant compliance work. Comparable in scale and government-only focus.
- McConnell & Jones: McConnell & Jones is a Houston-based CPA and advisory firm with a federal services practice providing audit and assurance to federal agencies. Comparable mid-size government-focused CPA peer.
- RMA Associates: RMA Associates is a government-focused CPA and consulting firm providing financial statement audits, FISMA, and advisory services to federal agencies. Highly comparable small-business federal audit peer to Williams Adley.
Broad incumbents
- Booz Allen Hamilton: Booz Allen Hamilton is a major federal services contractor with a large financial management and cyber risk practice competing for the same HHS, DoD, and civilian audit and FISMA engagements that Williams Adley pursues. Broader scale and consulting portfolio make it an incumbent threat.
- Withum Smith+Brown: Withum is a Top-30 U.S. accounting firm with a Government Services practice providing audit, tax, and advisory to federal agencies and contractors. Larger and more diversified than Williams Adley but directly comparable on federal audit offerings.
- Cherry Bekaert: Cherry Bekaert is a Top-25 U.S. accounting and advisory firm with a Government Services practice providing audit, tax, and advisory to federal agencies and government contractors. Comparable in offering mix though broader in industry exposure.
- CliftonLarsonAllen (CLA): CLA is a top-10 U.S. accounting firm with a large government services practice including federal and state audits. Williams Adley's Senior Advisor Sal Ercolano joined from CLA, underscoring the close overlap; CLA is larger and more diversified across industries.
- Guidehouse: Guidehouse (formerly PwC Public Sector) is a major federal advisory firm providing audit support, financial management, and cyber risk services to HHS, DoD, and civilian agencies. Directly comparable on engagements like the HHS BPA but with significantly greater scale.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Williams Adley social profiles
Digital presenceWilliams Adley financial estimates
Financial estimateRevenue estimate
Valuation estimate
Williams Adley leadership team
Management profileNumber of profiles
Profiles10 records
Williams Adley funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Williams Adley M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Williams Adley
What does Williams Adley do?
Williams Adley is a CPA and management consulting firm that delivers three core service lines to U.S. federal civilian and defense agencies: Audit and Assurance (financial audits, performance audits, and attestation engagements under GAO Yellow Book), Cybersecurity Risk Services or CRS (FISMA evaluations, FISCAM audits, SSAE 18 examinations, CMMC advisory, and StateRAMP authorizations), and Management Consulting (financial management consulting, process optimization, and audit remediation). Work is performed under government-wide acquisition contract vehicles such as GSA OASIS Small Business Pool 2, GSA MAS, and the DC Supply Schedule.
Is Williams Adley a public or private company?
Williams Adley is a private company. It is classified as management employee owned and is currently operating.
When was Williams Adley founded?
Williams Adley was founded in 1982. It employs 51 to 100 people.
Where is Williams Adley based?
Williams Adley is headquartered in Washington, United States, in the North America region.
How does Williams Adley make money?
Three revenue lines are on record. Audit and Assurance Services are the primary driver. The others are cybersecurity Risk Services and management Consulting.
Who are Williams Adley's main competitors?
Direct peers on record are Councilor, Buchanan & Mitchell (CBM), Kearney & Company, Cotton & Company (BDO USA), McConnell & Jones and RMA Associates. Broad incumbents are Booz Allen Hamilton, Withum Smith+Brown, Cherry Bekaert, CliftonLarsonAllen (CLA) and Guidehouse.
Does Williams Adley have an API?
No public API is recorded for Williams Adley.
What industry is Williams Adley in?
Williams Adley's product category is Government Auditing and Consulting Services. Its primary akta.pro industry code is BPAHABAE, Outsourced Finance & CFO Services. Its NAICS code is 541211 and its SIC code is 6199.