Bonadio & Co., LLP
Employee benefit plan audit practice profile, built from plan year 2024 Form 5500 filings.
Last updated · Source data: plan year 2024 Form 5500 filings
How many 401(k) plans does Bonadio & Co., LLP audit?
Bonadio & Co., LLP was the independent auditor for 443 retirement plan filings (482 audited filings including welfare plans) in plan year 2024, with clients in 22 states and territories — the #25 practice nationally by volume.
Practice at a glance
| Measure | Value |
|---|---|
| Firm EIN (as filed) | 16-1131146 |
| Retirement plan audits (401(k), 403(b), pension) | 443 |
| All audited filings (incl. welfare plans) | 482 |
| States and territories with clients | 22 |
| National rank by retirement plan volume | #25 of 3,956 |
| National rank, all audited filings (league-table basis) | #25 of 4,052 |
| Average client size (participants) | 1,194 |
| Largest client (participants) | 46,314 |
Rankings derived from U.S. Department of Labor Form 5500 filings, plan year 2024. Read the full methodology.
Where does Bonadio & Co., LLP audit plans?
| State | Plans audited | Share of practice |
|---|---|---|
| New York | 369 | 83.3% |
| Texas | 25 | 5.6% |
| Connecticut | 9 | 2.0% |
| Pennsylvania | 7 | 1.6% |
| California | 6 | 1.4% |
| North Carolina | 4 | 0.9% |
| Georgia | 3 | 0.7% |
| Colorado | 2 | 0.5% |
| Delaware | 2 | 0.5% |
| Michigan | 2 | 0.5% |
| New Jersey | 2 | 0.5% |
| Ohio | 2 | 0.5% |
| Illinois | 1 | 0.2% |
| Indiana | 1 | 0.2% |
| Louisiana | 1 | 0.2% |
| Massachusetts | 1 | 0.2% |
| Minnesota | 1 | 0.2% |
| Missouri | 1 | 0.2% |
| New Mexico | 1 | 0.2% |
| Oklahoma | 1 | 0.2% |
| Tennessee | 1 | 0.2% |
| Vermont | 1 | 0.2% |
Largest concentration: New York (369 plans). State reflects the plan sponsor’s address, not the firm’s office locations.
What audit opinions does Bonadio & Co., LLP issue?
| Opinion type | Filings | Share |
|---|---|---|
| Unmodified (clean) | 431 | 97.3% |
| Qualified | 2 | 0.5% |
| Disclaimer | 10 | 2.3% |
| Adverse | 0 | 0.0% |
As coded on Schedule H. A disclaimer here usually reflects the legacy limited-scope reporting convention (now the ERISA Section 103(a)(3)(C) election), not a failed audit — see the methodology.
Largest plans audited by Bonadio & Co., LLP
| Plan sponsor | State | Participants |
|---|---|---|
| University of Rochester | NY | 46,314 |
| Board of Trustees-New York State Nurses Association Pension Plan | NY | 44,283 |
| Cornell University | NY | 26,557 |
| Dish Network Corporation | CO | 17,476 |
| Avangrid Management Company, LLC | CT | 9,980 |
Comparing Bonadio & Co., LLP with other 401(k) audit firms?
See alternatives to Bonadio & Co., LLP for 401(k) audits: firms with comparable engagement volume and an overlapping state footprint, drawn from the same Form 5500 data.
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About this profile
This page is generated from public U.S. Department of Labor Form 5500 filings in which Bonadio & Co., LLP (EIN 16-1131146) is named as the plan’s independent qualified public accountant. Bonadio & Co., LLP did not supply, review, or endorse this information, and inclusion is not a recommendation. Filing data can contain sponsor-entered errors; corrections are welcome via the about page.