YC-Backed Startups: How to Find and Reach Them

Y Combinator has produced Airbnb, Stripe, Dropbox, and thousands of other companies. But the real reason YC founders make exceptional prospects has nothing to do with name recognition. It is structural. YC founders go through a programme that teaches them to move fast, evaluate tools quickly, and make decisions without committees. They have been trained to say yes or no in a single email. They are also disproportionately likely to raise follow-on funding — roughly 40% of YC companies raise a Series A within 18 months of graduating. This means they have budget, they are growing, and they are actively building their vendor stack.

A YC stamp signals three things that matter for B2B outreach. First, product-market fit has been at least partially validated — the company survived Demo Day and convinced investors to write cheques. Second, the founder is likely technical and values efficiency, so your pitch needs to be specific and outcome-driven, not fluffy. Third, YC companies operate in cohorts, which means founders talk to each other. Land one YC customer and referrals within the batch become possible. The network effect of the YC community works in your favour if your product actually delivers.

Here are real YC portfolio companies that recently raised capital and are actively scaling: 1. Autonomous ($15M, Pre-Seed) — Fire your financial advisor and become autonomous. Dillon Erb in New York, backed by Y Combinator. Fintech companies post-raise need compliance tools, banking infrastructure, and growth marketing. 2. Fortuna Health ($18M, Series A) — Medicaid made easy. Nikita Singareddy in New York, backed by a16z with YC participation. Healthcare startups at Series A are hiring aggressively and evaluating CRM and outreach tools. 3. Mastra ($13M, Seed) — The TypeScript agent framework. Sam Bhagwat in San Francisco, backed by YC. Developer tools companies invest in documentation, community platforms, and content marketing. 4. Lyra ($6M, Seed) — The AI-native Zoom for revenue teams. Courtne Marland in San Francisco, backed by YC and 468 Capital. Sales tech at seed stage means they are building their own sales stack right now. 5. Orchids ($2M, Seed) — Build beautiful apps and websites with AI. Kevin Lu in Irvine, backed by YC. No-code tools need design partnerships, hosting infrastructure, and early growth strategies. 6. pally ($1.1M, Pre-Seed) — AI relationship management across all your socials. Haz Hubble in San Francisco, backed by YC. Early-stage social tools need API integrations and launch marketing. 7. Birches Health ($20M, Series A) — Gambling addiction treatment that works. Elliott Rapaport in New York, backed by AlleyCorp with YC connections. Health tech companies post-Series A are buying patient management and compliance platforms. 8. Thread AI ($20M, Series A) — Build, connect, and manage AI-powered workflows. Angela McNeal in New York, backed by Greycroft with YC ties. Workflow automation companies need integration partners and enterprise sales tooling.

The manual approach: go to ycombinator.com/companies, find the company, visit their website, guess the email pattern (first@company.com), and verify it with Hunter or Snov.io. This takes 10–15 minutes per founder and the email might bounce. The alternative: search JustRaised by investor, filter for Y Combinator, and get verified founder emails instantly. Every contact includes a verification score so you know the data is fresh. The difference is not just speed — it is coverage. The YC directory does not include founder emails, and many YC companies do not list team pages on their websites. JustRaised cross-references multiple data sources to verify each address.