Acquisition
Dec 2025Harbor Compliance announced it had acquired Firstbase.io, bringing Firstbase into Harbor Compliance's compliance platform and support network.
SourceThe all-in-one startup operating system
Company research
Public company, workplace, funding, and market signals
Overview
Firstbase.io is a New York-based, founder-focused business operations platform that helps entrepreneurs incorporate and run U.S. companies with an all-in-one stack spanning formation, compliance, mailroom, bookkeeping, and tax. The company was founded in 2019 and was acquired by Harbor Compliance in December 2025.
Primary product
Firstbase One, an all-in-one startup operating system for incorporation, compliance, bookkeeping, and tax
Founded
2019
Headquarters
New York, New York, United States
Team size
40-50
Work style
Flexible
Industry
Technology, Information and Internet
Sub-industry
Business formation and compliance software for founders
Offices
New York City, New York, United States
São Paulo, Brazil
Business model
SaaS subscriptions
one-time incorporation fees
managed services
Funding
Stage
acquired / late-stage private
Total raised
$7.1M
Latest round
Convertible Note · Mar 2024
Latest amount
$1.5M
People & investors
Founders
Danny Olinsky
Co-founder
Work & culture
Remote-first and flexible, with a distributed team philosophy, NYC and São Paulo offices, and an emphasis on fearless feedback, cross-functional ownership, and helping founders worldwide.
Work style
Flexible
Visa sponsorship
Limited
Compensation
Public careers copy advertises competitive salaries, equity, stock refreshers, and annual bonuses that start at 10% of base salary in year one and 20% thereafter, with case-by-case visa sponsorship for select NYC-based roles.
Benefits
competitive salaries
equity
stock refreshers
health and wellness stipends
learning and development funds
renewable gear stipends
parental leave
annual bonuses
annual retreats
quarterly leadership planning sessions
remote-first flexibility
hybrid options in NYC
Product & market
Pricing
One-time incorporation fees plus annual subscriptions and custom pricing for ongoing compliance, mailroom, accounting, and tax services.
Differentiators
- —all-in-one company OS for founders
- —integrated incorporation, registered agent, mailroom, accounting, and tax
- —strong international founder focus
- —global support across 188+ countries
- —startup perks and partner credits
- —one dashboard for back-office operations
Technology
PHP
Stripe
Kubernetes
Python
OpenAI
GitLab
Slack
Figma
PostgreSQL
Redis
MongoDB
Datadog
Zendesk
HubSpot
Docker
Customers
international founders
U.S. startup founders
LLCs and C-Corps
small and growing startups
founders needing compliance, accounting, and tax support
Competitors
Stripe Atlas
doola
LegalZoom
Northwest Registered Agent
ZenBusiness
Scale & contact
Estimated revenue
approximately $14.4M/year (Growjo estimate)
Estimated monthly visits
218.5K
Traffic estimate as of Jun 2026
Signals & risks
Other
Sep 2024Firstbase.io, Inc. filed for Chapter 11 bankruptcy in the Southern District of New York; the case later showed plan confirmation and post-confirmation trust activity in 2025-2026.
SourceLatest news
Harbor Compliance · Dec 2025
Harbor Compliance announced it had acquired Firstbase.io and said Firstbase customers would continue using the platform with Harbor Compliance's compliance infrastructure and expert network.
Firstbase blog · Jul 2025
Firstbase launched a role-based permission system so account owners can control who can view, edit, bill, or manage different parts of the platform.
Firstbase blog · May 2025
Firstbase introduced Invoices as part of its accounting product to help founders and finance teams manage accounts receivable.
Firstbase blog · Oct 2024
Firstbase launched Firstbase One, a bundled suite for registered agent, accounting, mailroom, and tax filing.
Firstbase blog · Aug 2023
Firstbase launched a full-service accounting product with accrual and cash-based functionality inside its founder app.
Jobs and careers at Firstbase.io
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