Stax.ai
Stax.ai is an AI-powered operating system for U.S. retirement plan third-party administrators, automating census intake, payroll connectivity, trust accounting, compliance, and client communications. Its CX and Trust Accounting platforms serve 72 TPAs and 8 of the top 10 independent TPAs by plan count, covering 150,000+ active retirement plans nationwide.
- Company typePrivate
- Founded2019
- HeadquartersScottsdale, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Stax.ai does
Stax.ai is an AI-powered operating system for third-party administrators (TPAs) of U.S. retirement plans, automating the workflow spine of census intake, payroll connectivity, trust accounting, compliance, and client communications. Founded in 2019 as Aptus Engineering to build document automation for healthcare, the company pivoted to the retirement industry in 2021 after a Tucson-based TPA, Pinnacle Plan Design, validated brokerage statement processing as a beachhead use case. By mid-2023 the company spun out Stax.ai as a separate entity, phased out non-retirement projects, and built out two core products: Stax.ai CX (Client Experience), an AI-driven CRM and white-label plan sponsor portal with Smart Inbox, and Trust Accounting, which automates brokerage statement ingestion, reconciliation, and reporting across custodians such as Charles Schwab, Fidelity, Merrill Lynch, and Wells Fargo Advisors.
The platform runs on multi-region AWS infrastructure and combines document AI, computer vision, NLP, anomaly detection, and predictive analytics to address SECURE 2.0 LTPT eligibility tracking, 3(16) fiduciary workflows, automated participant notice distribution, and bidirectional payroll/recordkeeper data sync via a natively embedded Finch integration covering 200-250+ payroll providers (80%+ of the U.S. payroll market). Quantified outcomes cited by the company include 75% reduction in census prep time, 98% reduction in data errors, trust reconciliation reduced from hours to minutes, and a 29% lift in plan sponsor satisfaction within 90 days.
Stax.ai operates a sales-led, direct-only GTM targeting both boutique TPAs (20+ plans) and large independent TPAs (10,000+ plans), selling annual subscriptions scaled per plan or per sponsor with implementation, onboarding, data migration, and team training included. The company reports 8 of the top 10 independent TPAs by plan count as customers, 72 TPAs served in 2024, and over 150,000 active retirement plans on platform. Total disclosed funding is $11.65 million across a 2023 SEC Form D raise and a November 2024 $7M Series A led by Neotribe Ventures. The company is SOC 2 Type II and SOC 1 certified, headquartered in Scottsdale, Arizona, and operates exclusively in the U.S. market.
Stax.ai firmographics
Firmographics- Name
- Stax.ai
- Legal name
- Stax.ai, Inc.
- Website
- https://stax.ai
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Stax.ai is an AI-powered operating system for U.S. retirement plan third-party administrators, automating census intake, payroll connectivity, trust accounting, compliance, and client communications. Its CX and Trust Accounting platforms serve 72 TPAs and 8 of the top 10 independent TPAs by plan count, covering 150,000+ active retirement plans nationwide.
- Ownership category
- akta.pro rank
Stax.ai industry classification
Industry- Product category
- Retirement Plan Administration Software
- NAICS
- Pharmacy Benefit Management and Other Third Party Administration of Insurance and Pension Funds (524292), Custom Computer Programming Services (541511), Computer Systems Design and Related Services (54151)
- SIC
- Services-Computer Programming, Data Processing, Etc. (7370), Services-Computer Integrated Systems Design (7373), Insurance Agents, Brokers & Service (6411)
- akta.pro primary industry
- Customer Experience (CX) & Digital Experience (BPAHAEAC)
- akta.pro secondary industry
- Enterprise AI Governance, Risk & Compliance Platforms (Model Risk, Audit, Policies) (HDAEANAE)
Keywords
Where Stax.ai is headquartered
LocationHeadquarters
- HQ city
- Scottsdale
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Stax.ai business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- SaaS Platform Subscription: Subscription-based SaaS platform for retirement TPAs. Pricing is scalable based on the number of plan sponsors and plans managed. Customers gain access to the full platform including CX (Client Experience/CRM), Trust Accounting, payroll integrations, and compliance workflows. Implementation, onboarding, and training are included as part of the service.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Annual | Per-plan or per-sponsor subscription |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels6 records
Stax.ai product offering
Product offeringCore offering
Stax.ai provides an AI-powered operating system for U.S. retirement plan third-party administrators (TPAs), consisting of Stax.ai CX (a CRM, white-label sponsor portal, AI Smart Inbox, and workflow automation platform) and Trust Accounting (AI-driven brokerage statement processing and reconciliation). The platform unifies payroll connectivity (200+ providers via Finch), census automation, trust accounting, 3(16) fiduciary compliance, and client communications into a single SaaS subscription.
Product overview
Stax.ai is an AI-powered operating system for retirement plan TPAs, consisting of two core integrated products: Stax.ai CX (Client Experience) and Trust Accounting. CX serves as the primary CRM, client portal, and workflow automation platform, while Trust Accounting handles brokerage statement processing and reconciliation. Both products share an AI engine for document processing, payroll connectivity via Finch, and automated census workflows. The platform unifies payroll, census, trust accounting, compliance, and client communications into one seamless experience for TPAs managing 401(k) and retirement plans.
Differentiator
Problem solved
Functional benefit
Brands
- CX (Client Experience): All-in-one client experience and plan administration platform for retirement TPAs, combining CRM, workflow automation, white-label sponsor portal, payroll integrations, AI-powered census scrubbing, and trust accounting.
- TA (Trust Accounting)
Products and services
- Stax.ai CX (Client Experience) All-in-one CRM, client experience, and workflow automation platform for retirement TPAs that combines email automation, project management, white-label client portal, payroll integration, AI-powered Smart Inbox with sentiment analysis and task creation, AI deal forecasting, and 3(16) fiduciary workflow automation. Designed for independent retirement third-party administrators managing 401(k) and other qualified plans.
- Trust Accounting AI-powered trust accounting workflow that automates processing of brokerage statements from custodians such as Charles Schwab, Fidelity, Merrill Lynch, and Wells Fargo Advisors. Automatically extracts balances, transactions, and fees, splits transactions, reconciles across multiple custodians, categorizes and files documents, and produces audit-ready reporting. Saves TPAs 3-10 hours per plan per year.
- 3(16) Payroll Processing and Compliance Service Automated 3(16) fiduciary plan administration service delivering live payroll data feeds from 200+ providers, automated 3(16) task tracking, real-time compliance visibility, error-free payroll validation, SECURE 2.0 LTPT eligibility automation, and automated participant notice distribution for retirement TPAs serving as 3(16) fiduciaries.
Quantifiable outcome
- Census prep time reduced by 75% and data errors by 98%
- +7 more outcomes
Companies that use Stax.ai
Customer profileNamed customers8 records
Segments1 record
Ideal customer profiles2 records
Stax.ai technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration15 records
AI capability14 records
Feature10 records
Stax.ai partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core.
- FinchcoreStax.ai is the only retirement plan administration platform with Finch natively embedded into census, compliance, and client portal workflows — not a separate integration. The partnership provides universal payroll coverage via 200+ API integrations plus document AI that standardizes payroll reports for unsupported providers. The deeper partnership also includes 360-degree recordkeeper connectivity for bidirectional payroll and participant data, automating deferral and contribution updates. The integration covers 80%+ of the U.S. payroll market including ADP, QuickBooks, Gusto, Paycom, Paylocity, Paychex, UKG Pro, UKG Ready, Workday, TriNet, and more.
- Pinnacle Plan DesigncorePinnacle Plan Design (Tucson, AZ) was Stax.ai's first TPA customer, introduced in 2021 when Stax.ai (then Aptus Engineering) helped automate their manual brokerage statement sorting and filing workflow. Pinnacle's specific pain point — thousands of brokerage statements arriving by mail with staff spending hours scanning, sorting, and filing by client — was the original use case that validated Stax.ai's document automation technology for the retirement industry.
Scale indicators11 records
Recent moves6 records
Expansion highlights5 records
Stax.ai competitors and assessment
Company assessmentDirect peers
- PensionPro: Long-standing retirement plan administration software for TPAs. Most directly comparable to Stax.ai — Stax.ai customer case studies explicitly describe migrations off PensionPro (e.g., PlanPerfect in ~4 months), positioning PensionPro as the incumbent Stax.ai displaces.
- DATAIR: Specialist retirement plan administration software vendor serving defined benefit, defined contribution, and 401(k) plans. Comparable as a direct peer in the same niche software category, competing for TPA buyers with overlapping census, compliance, and reporting capabilities.
- ftwilliam.com: Retirement plan document, compliance, and administration software used by TPAs and plan sponsors. Comparable as a peer in TPA-targeted retirement administration tooling, addressing similar workflows around plan documents, compliance testing, and Form 5500 preparation.
Emerging players
- Vestwell: Modern, advisor/TPA-facing retirement platform offering 401(k) recordkeeping and administration technology. Comparable as a next-generation, API-native alternative for retirement plan administration workflows where Stax.ai competes for the same emerging digital-first buyers.
- Lenz: Plan document AI and retirement compliance software focused on document automation for plans. Comparable as an emerging AI-first peer attacking overlapping retirement plan document and compliance workflows where Stax.ai applies document AI to brokerage statements and census files.
Broad incumbents
- Employee Navigator: Broader HR and benefits administration platform with retirement plan management capabilities. Comparable as an established SaaS incumbent in adjacent benefits-administration workflows that overlaps with Stax.ai's CRM and client-portal surface area at the TPA buyer.
- Ascensus: Large recordkeeper with proprietary TPA-facing administration tools and IRA/defined-contribution services. Comparable as a well-capitalized incumbent offering bundled administration technology that competes for the same TPA budget and workflow mindshare.
- Empower Retirement: Major U.S. recordkeeper (Empower Personal Dashboard, retirement plan administration). Comparable as a large incumbent that can bundle admin tooling and AI features to its captive TPA network, competing with Stax.ai on integrated offerings.
- Fidelity Investments (Workplace Investing): Major U.S. recordkeeper offering integrated 401(k) administration tools to TPAs and plan sponsors. Comparable as a broad incumbent with the captive distribution and R&D resources to bundle competing admin and AI tooling into its platform offering.
- Voya Financial: Recordkeeper and retirement plan services provider offering administration and participant experience tools to TPAs and plan sponsors. Comparable as a broad incumbent that could compete with Stax.ai via integrated retirement plan administration technology.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Stax.ai social profiles
Digital presenceStax.ai compliance and trust
Trust signalCompliance2 records
Stax.ai financial estimates
Financial estimateRevenue estimate
Valuation estimate
Stax.ai leadership team
Management profileNumber of profiles
Profiles5 records
Stax.ai funding detail
Funding detailFunding overview
Funding rounds2 records
Investors2 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Stax.ai 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 Stax.ai
What does Stax.ai do?
Stax.ai provides an AI-powered operating system for U.S. retirement plan third-party administrators (TPAs), consisting of Stax.ai CX (a CRM, white-label sponsor portal, AI Smart Inbox, and workflow automation platform) and Trust Accounting (AI-driven brokerage statement processing and reconciliation). The platform unifies payroll connectivity (200+ providers via Finch), census automation, trust accounting, 3(16) fiduciary compliance, and client communications into a single SaaS subscription.
Is Stax.ai a public or private company?
Stax.ai is a private company. It is classified as venture growth investor backed and is currently operating.
When was Stax.ai founded?
Stax.ai was founded in 2019. It employs 11 to 50 people.
Where is Stax.ai based?
Stax.ai is headquartered in Scottsdale, United States, in the North America region.
How does Stax.ai make money?
One revenue line is on record: saaS Platform Subscription.
Who are Stax.ai's main competitors?
Direct peers on record are PensionPro, DATAIR and ftwilliam.com. Emerging players are Vestwell and Lenz. Broad incumbents are Employee Navigator, Ascensus, Empower Retirement, Fidelity Investments (Workplace Investing) and Voya Financial.
Does Stax.ai have an API?
Yes. Stax.ai offers an open API for third-party integrations. The platform integrates with 200+ payroll providers via Finch for automated payroll data parsing. For plan sponsors whose payroll providers aren't supported via API, reports can be uploaded and the system remembers field mappings for future uploads. Developer documentation is at Not specified.
What industry is Stax.ai in?
Stax.ai's product category is Retirement Plan Administration Software. Its primary akta.pro industry code is BPAHAEAC, Customer Experience (CX) & Digital Experience, with a secondary code of HDAEANAE, Enterprise AI Governance, Risk & Compliance Platforms (Model Risk, Audit, Policies). Its NAICS code is 524292 and its SIC code is 7370.