Startup Directory
Series I Startups
Track Series I startups by company momentum, founder context, investor activity, hiring signals, and related funding-stage intelligence.
Research Brief
How to evaluate Series I startup lists
A Series I list should be read through maturity, capital use, hiring pressure, and market timing. The same round label can mean different things across software, biotech, hardware, consumer, and infrastructure companies. 100Xfounder ranks these profiles with a funding-first lens, then connects each company to founder data, country context, market category, and related newsroom coverage.
Series I market context
Series I companies often sit at a transition point: proving a wedge, scaling go-to-market, deepening product infrastructure, or preparing for larger enterprise demand. The page currently tracks 2 indexed companies tied to this round context. Readers should compare these companies against adjacent stages, because movement from Seed to Series A or Series A to Series B often changes the risk profile completely.
SStripe
Stripe is a developer-oriented commerce company helping small and large companies accept web and mobile payments. FinTech Payments SaaS
Last round: Growth Sequoia, Andreessen Horowitz, $6B Series I in 2023, $50.0B valuation
TThumbtack
Thumbtack is a technology company that builds a modern home management platform. Home Services Marketplaces
Last round: Growth Sequoia, $698M Series I in 2021, $3.2B valuation
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Internal Research Paths
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FAQ
Questions about Series I startups
What is this Series I startup page?
It is a 100Xfounder directory page for Series I startups, combining company profiles, founder context, funding signals, hiring indicators, and internal links into related market pages. 2 companies are currently included in this view.
How are Series I startups selected?
The page uses structured 100Xfounder company and founder data, then groups profiles by funding round. Ordering favors stronger funding, verified company context, founder detail, hiring signals, and useful internal research paths.
How complete is this market page?
The page remains available as a lightweight discovery route while company depth grows.
Where should I go next after this Series I list?
Use related founder profiles, company pages, funding-round pages, country hubs, startup jobs, salary-equity pages, and newsroom coverage to understand the broader market context around these companies.
Connected Pillar Routes
Continue discovery through country, industry, stage, funding, and newsroom hubs.