The best 401(k) data providers in 2026: ranked for advisors, asset managers, and recordkeepers.

How we compared them

We build one of the products on this page, so treat our ranking as a vendor's view and check it against the sources. To make that easy, every competitor number below is that vendor's own published claim, linked to the page we read it on and dated to the month we read it. Where a vendor does not publish something — a price, a contact count — we say "not published" rather than estimate it.

We compared on five things an advisor actually feels: how much data is joined to each plan, whether the tool finds a person to call, whether it helps you write to them, what it costs to start, and how fast you can start. We did not score on features no vendor documents publicly.

• →Data breadth: Form 5500 alone, or filings joined with other public sources?
• →Contacts: a pre-built file, on-demand lookup, or none — and is confidence disclosed?
• →Outreach: does the tool help produce the first message, or stop at the list?
• →Price and terms: published or quote-only; monthly or annual; per seat or usage.
• →Time to first list: self-serve signup, or a demo and a contract first?

Why "how much data" is the real difference

Every tool here starts from the same public record: the Form 5500 that retirement plans file each year with the Department of Labor. The filing tells you plan assets, participants, contributions and, for larger plans, what each service provider was paid on Schedule C. If two tools only reformat that filing, they differ mainly in filters and price.

The gap opens when a tool joins other records to the filing. A small plan files the short Form 5500-SF, which has no Schedule C, so a filing-only tool cannot tell you who the recordkeeper or TPA is for most of the roughly 800,000 small plans in the country. 401kHunter closes that gap by matching each small plan's IRS opinion-letter serial number against the IRS list of pre-approved plan documents, which identifies the firm behind the plan document for about 85% of small plans, and by inferring the recordkeeper from plans on the same document that later disclosed one. Audited financial statements and SEC 11-K filings supply Roth and plan-design facts the 5500 has no box for. OSHA, IRS 990 and FMCSA records supply current headcounts. 1.08M businesses with payroll but no ERISA-filed plan come from SBA and SEC records.

Of the 833,851 U.S. retirement plans with enough fee data to grade, 10.2% earn a D (reported administrative expenses above 1.5% of plan assets) and 60.9% earn an A (0.5% or less), per 401kHunter's analysis of Form 5500 filings as of August 2026.

Which provider fits which buyer

The same nine providers, sorted by who is buying.

• →Independent advisors and small RIAs: 401kHunter first; Judy Diamond if you work one state and want printed reports.
• →Asset managers, DCIO wholesalers: AdvizorPro PlanPro or ISS MarketPro for advisor-to-plan mapping.
• →Recordkeepers and TPAs prospecting at volume: Larkspur Executive for campaigns; 401kHunter for provider-specific targeting, including small plans where no Schedule C exists.
• →Pension and cash-balance specialists: O3 Edge.
• →ERISA attorneys, CPAs, compliance teams: ERISApedia.
• →Anyone evaluating an existing lineup: Fi360, alongside a prospecting tool.