Guideline

Market position

Guideline reports approximately 10% market share among new 401(k) plans and, as of mid-2024, served over 50,000 businesses covering more than 1 million employees with $13 billion in AUM. TechCrunch identifies Human Interest, backed by SoftBank and Baillie Gifford, as its closest rival; other competition comes from traditional providers (Fidelity, Charles Schwab, John Hancock), robo-advisors entering 401(k) such as Betterment for Business, and other venture-backed entrants including Honest Dollar (acquired by Goldman Sachs) [4][5].

Transparent flat-fee pricing instead of asset-based fees, an in-house vertically integrated technology stack covering recordkeeping through administration, and deep native integration with payroll — most notably with Gusto, where 401(k) and payroll operate on a single login without third-party integrations [0][1][4][5].

Technology

A cloud-based, vertically integrated SaaS platform built largely in-house, spanning recordkeeping, plan administration, transaction and trade processing, compliance testing, and regulatory filings, with a web portal, mobile app, and direct payroll synchronization that automates deductions and contributions [0][1][5].

Go-to-market

Distribution runs primarily through payroll provider partnerships — including Gusto, Square, ADP, Intuit, Paylocity, TriNet, and Rippling — which refer customers to Guideline for plan setup. A self-serve portal serves businesses not on Gusto payroll, and after the acquisition the product is also sold and administered inside the Gusto dashboard [0][1][4][5].

Small and medium-sized businesses and solopreneurs seeking employer-sponsored 401(k) plans, plus individuals using the Guideline IRA. Initial product-market fit came from VC-backed technology startups with large numbers of high-earning employees [0][1][5].

Geography

Headquartered in San Mateo, California, United States; the sources describe a U.S.-focused 401(k) and IRA offering and do not mention international operations [5].

History

Guideline was founded in 2015 [4][5]. Gusto began reselling 401(k) plans through a partnership with Guideline the same year [4]. The company raised a $200 million Series D in 2021 at a $1.15 billion valuation, part of a reported $340 million (TechCrunch) to $356 million (Sacra) raised in total across six rounds [4][5]. It crossed $100 million ARR at the end of 2023 and $120 million ARR by June 2024 [5]. On August 27, 2025, Gusto announced an agreement to acquire the company [5]; TechCrunch reported on October 1, 2025 that the price was approximately $600 million, below the 2021 private valuation, though Guideline disputed the figure [4].

Risks & controversies

TechCrunch's reported $600 million acquisition price is disputed by Guideline's spokesperson, and its report that Gusto plans to divest customers linked to rival payroll providers is contradicted by the company. The reported sale price is below the company's $1.15 billion 2021 private valuation, and TechCrunch notes the rationale for selling remains unclear given the company's stated profitability. Sources also note the flat-fee, simplified approach may not suit larger companies with complex needs, and that competitor Human Interest grew 70% in the prior year and was reportedly raising at a $3 billion valuation [4][5].