Founders Directory LogoFounders Directory

Discover the next generation of startups.

A curated directory of high-growth companies backed by the world's most prestigious venture capital firms.

914Companies

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Fern logo

Fern

YCombinator

RL environments for robotics companies

Fern provides RL environments for robotics companies powered by a foundational world model. Companies can plug and play their robot policies completely in software with varying starting scenes of their production environment, and we'll produce RL heads on top of your existing policies to improve speed and success rate. Our customers get a continual learning flywheel where their production robots improve every week.

San Francisco, CAY Combinator LogoWinter 2026ActiveRoboticsInfrastructure
Fernstone logo

Fernstone

YCombinator

AI-native insurance brokerage.

Fernstone is an AI-native insurance brokerage: we combine AI with licensed brokers to obtain complex insurance faster, and at better terms. Today, we manage risk for 100+ businesses in construction, security, and the trades.

New York City, NYY Combinator LogoFall 2025Active
FinalDose logo

FinalDose

YCombinator

Programmable DNA drug destroying all cancers, unlocking 80% of targets

FinalDose is building the first programmable drug - a single smart drug molecule that you can insert any diseased genetic code and it can search and destroy cells upon DNA recognition. Unlocking 80% of undruggable targets today. Starting with all cancers.

London, United KingdomY Combinator LogoSpring 2026ActiveArtificial IntelligenceGene TherapyTherapeuticsGenetic Engineering
Finto logo

Finto

YCombinator

AI accounting for enterprise finance teams

Finto builds AI accounting software for enterprise finance teams. We automate the invoice-to-pay process from their email inbox to their ERP. Cutting out 80% of the accountants daily work in invoice recording, account coding and invoice approvals.

Munich, GermanyY Combinator LogoSummer 2025ActiveArtificial IntelligenceFintechB2BEnterpriseAI
Fivestars logo

Fivestars

YCombinator

Customer loyalty and payments platform for small businesses.

Fivestars is a leading payment and customer loyalty platform for small local businesses. Our mission is to help businesses and communities thrive by turning every transaction into a relationship. Since launching in 2011, Fivestars has become a rewarding platform with 60 million users discovering and driving sales to 14,000+ small businesses. We help drive over $3 billion in local sales per year. More than 1 million people sign up monthly to support the local businesses that make our neighborhoods great. The company is backed by Lightspeed, DCM, Menlo Ventures, HarbourVest, and others. Together, let’s #LoveLocal. Visit www.fivestars.com for more information.

San FranciscoY Combinator LogoWinter 2011AcquiredFintechMarketplaceSan Francisco
Fivetran logo

Fivetran

YCombinator

The leader in automated data movement

Fivetran automates data movement out of, into and across cloud data platforms. We automate the most time-consuming parts of the ELT process from extracts to schema drift handling to transformations, so data engineers can focus on higher-impact projects with total pipeline peace of mind. With 99.9% uptime and self-healing pipelines, Fivetran enables hundreds of leading brands across the globe, including Autodesk, Conagra Brands, JetBlue, Lionsgate, Morgan Stanley, and Ziff Davis, to accelerate data-driven decisions and drive business growth. Fivetran is headquartered in Oakland, California, with offices around the world.

San FranciscoY Combinator LogoWinter 2013ActiveSaaSB2BAnalyticsData EngineeringSan Francisco
Fixture logo

Fixture

YCombinator

An AI-first CRM built for Startups

Fixture is an AI-native CRM built for startups. It integrates with all the tools you use to communicate with customers, tracks marketing channels (e.g. website traffic), and pulls everything into a single go-to-market context store. Our AI agents proactively help you move your deals forward, and you can use Fixture from our web UI or any of your favorite AI tools (e.g. Claude Code).

San Francisco, CAY Combinator LogoWinter 2026Active
Flaviar logo

Flaviar

YCombinator

Try-at-home service for fine spirits

Flaviar, a spirits tasting club, offers a subscription service that helps members discover new liquor products through sample tasting packs. Every month, subscribers receive a tasting kit featuring 3 samples of spirits that have been sourced from across the globe.

Ljubljana, SloveniaY Combinator LogoSummer 2014ActiveMarketplaceFood & Beverage
Fleetline logo

Fleetline

YCombinator

Optimizing fleet planning with data driven algorithms

Fleetline is building the first complete-context algorithmic load planner for mid to large-sized trucking fleets. Today’s dispatchers face an overwhelming task: balancing regulations, customer demands, live fleet data, and individual driver needs, all while coordinating across siloed tools and teams. Mistakes run rampant, and each mistake is thousands of dollars. Even the select fleets using algorithms that have fleet-wide context struggle: the outputs are rigid, hard to interpret, and are blind to real-world nuances like driver preferences and schedule exceptions. Fleetline solves this by combining advanced optimization with LLMs that can easily adapt algorithms to each fleet’s needs and capture driver-specific information. The result is smarter planning truly optimized for every fleet and its drivers.

New York City, NYY Combinator LogoSummer 2025ActiveArtificial IntelligenceLogisticsSupply ChainData Science
Flexport logo

Flexport

YCombinator

Platform for global logistics.

Founded in 2013, we believe trade can move the human race forward. That’s why our mission at Flexport is to make global trade easy for everyone. What the internet has done for bits and bytes, Flexport is doing for physical goods: giving every business the ability to connect to any customer, wherever they are in the world. That sounds pretty straightforward, but a fragmented and inefficient global supply chain has held the world back from untapped growth and innovation. By connecting everyone in the global economy we can unlock commerce, creativity, and human progress. To do so, we’re building the platform for global logistics—empowering buyers, sellers and their logistics partners with the technology and services they need to grow and innovate. Today, we work with more than 40,000 customers and their suppliers across industries like manufacturing, retail, electronics, consumer goods, tech, apparel, and beauty. Companies of all sizes—from emerging brands to Fortune 500s—used Flexport technology to move nearly $19B of merchandise across 112 countries in 2021. Interested in joining our team? Check out our open job postings on careers site and apply directly today! https://www.flexport.com/careers/jobs/

San FranciscoY Combinator LogoWinter 2014ActiveSaaSLogisticsSupply ChainSan Francisco
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