McMahon & Associates
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 McMahon & Associates audit?
McMahon & Associates was the independent auditor for 5 retirement plan filings in plan year 2024, with clients in 2 states and territories — the #1,355 practice nationally by volume.
Practice at a glance
| Measure | Value |
|---|---|
| Firm EIN (as filed) | 35-1438231 |
| Retirement plan audits (401(k), 403(b), pension) | 5 |
| All audited filings (incl. welfare plans) | 5 |
| States and territories with clients | 2 |
| National rank by retirement plan volume | #1,355 of 3,956 |
| National rank, all audited filings (league-table basis) | #1,353 of 4,052 |
| Average client size (participants) | 555 |
| Largest client (participants) | 1,359 |
Rankings derived from U.S. Department of Labor Form 5500 filings, plan year 2024. Read the full methodology.
Where does McMahon & Associates audit plans?
| State | Plans audited | Share of practice |
|---|---|---|
| Indiana | 4 | 80.0% |
| Illinois | 1 | 20.0% |
Largest concentration: Indiana (4 plans). State reflects the plan sponsor’s address, not the firm’s office locations.
What audit opinions does McMahon & Associates issue?
| Opinion type | Filings | Share |
|---|---|---|
| Unmodified (clean) | 5 | 100.0% |
| Qualified | 0 | 0.0% |
| Disclaimer | 0 | 0.0% |
| 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 McMahon & Associates
| Plan sponsor | State | Participants |
|---|---|---|
| MR. Bult's, Inc. | IL | 1,359 |
| Family Express Corporation | IN | 530 |
| Bosak Motor Sales Inc | IN | 473 |
| Tradewinds Services, Inc. | IN | 246 |
| Mike Anderson Chevrolet of Merrillville | IN | 165 |
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<a href="https://401kauditscout.com/firm/mcmahon-and-associates/"><img src="https://401kauditscout.com/badges/mcmahon-and-associates.svg" alt="McMahon & Associates: ranked #1,353 for 401(k) plan audits by 401k Audit Scout, 2026" width="360" height="80" loading="lazy"></a>Please keep the badge unmodified and linked to this profile. Rank reflects engagement volume as filed, not audit quality — see the methodology.
About this profile
This page is generated from public U.S. Department of Labor Form 5500 filings in which McMahon & Associates (EIN 35-1438231) is named as the plan’s independent qualified public accountant. McMahon & Associates 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.