Y Combinator portfolio in New York

The most prolific seed accelerator in the world, batch class twice a year. Filtered to companies headquartered in New York.

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Built from a search like: “Y Combinator-backed companies in New York”

Ranked by current headcount across Y Combinator-backed companies in New York. Refreshed daily.

1
Café (YC S21)· New York, New York, United States
Café helps enterprises drive collaboration, engagement, and cohesion through real-world interactions.Employees can discover colleagues, coordinate in-person meetings, and manage internal events — all in one platform.By connecting teams across locations and departments, Café boosts productivity, knowledge sharing, and organizational alignment.Make your workforce more connected, engaged, and collaborative ☕️
- Pre-seed
- 13.7k employees
- Founded 2020
2
Nourish· New York City Metropolitan Area
Nourish is addressing the root cause of the chronic disease crisis through AI-powered, insurance-covered virtual nutrition care. We are tackling one of the most important problems in the world — our broken healthcare system. We are building a digital health system that is patient-friendly, prioritizes lifestyle change, delivers outcomes, and lowers costs.
- Series C
- 3.7k employees
- Founded 2021
3
Optimizely· New York, New York, United States
Optimizely is the AI platform for marketing, built for the experience-makers who shape how brands show up in the world. Bringing together content management, content marketing, experimentation, commerce, personalization, and analytics into a single platform, Optimizely gives marketers the freedom to create, customers the experiences they remember, and AI agents the content they come looking for. With Optimizely, you're free to grow. Learn more at optimizely.com.
- Debt
- 1.7k employees
- Founded 2010
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4
ACLU· New York, New York, United States
The ACLU is an non-profit, non-partisan organization of people who believe in the power of action. We are united by the quest – “We the people dare to create a more perfect union.” Whether in the courts, statehouses, Congress or communities, we fight to defend the rights that the Constitution guarantees to all of us —regardless of who we are, where we come from, whom we love, or what we believe. Together, we take up the toughest civil rights and liberties challenges of our time. We seek to inspire those who want change to become the ones who make change.
- Grant
- 1.3k employees
- Founded 1920
5
Seeking Alpha· New York, New York, United States
Founded in 2005, Seeking Alpha is an industry-leading financial research platform powered by one of the world’s largest investing communities. We bridge the gap between financial information and actionable insight by providing unrivaled coverage on all asset classes and access to best-in-class tools. From in-depth analysis on thousands of stocks to timely investment ideas and market-beating Quant ratings, Seeking Alpha is an essential resource for millions of investors globally.Any content and tools on the Seeking Alpha platform are offered for information purposes only. Seeking Alpha does not take account of individuals' objectives or financial situation and does not offer any personalized investment advice. Seeking Alpha is not a licensed securities dealer, broker or US investment adviser or investment bank.
- Seed
- 958 employees
- Founded 2005

6
Genius· New York, New York, United States
Genius celebrates More Than The Music—the lyrics, the stories behind the songs, and the creative connections that meaningfully drive culture.We champion curiosity and believe that everyone has music knowledge to share: insights, intel, and musings that make us more informed, engaged music lovers. As the world's biggest music encyclopedia with a passionate community of more than two million contributors, Genius is a destination for artists, creatives, and superfans to discuss and deconstruct all things music.Through our original content, technology, and live & virtual experiences, Genius spotlights the artists who are shaping music culture across every genre and musical discipline, sharing the stories behind their creativity and craft in their own words.
- Series unknown
- 813 employees
- Founded 2009
7
Photoroom· New York, New York, United States
Founded in 2019, Photoroom is the leading AI visual solution for e-commerce, processing over 7 billion images a year across mobile, web, and API, trusted by over 1 million businesses and 300 million people across 180+ countries.From solo sellers to global retailers and marketplaces like DoorDash and Depop, businesses use Photoroom to turn first impressions into sales, creating professional product visuals at scale, launching faster, selling more, and cutting photography costs without compromising quality. Photoroom is backed by global investors including Y Combinator, Balderton, and FJ Labs, with offices in Paris and New York.
- Series B
- 696 employees
- Founded 2019
8
H1· New York, New York, United States
H1 is on a mission to connect the world with the right doctors. H1’s AI-powered platform leverages a continuously learning Doctor Graph to identify and engage the right doctor for the critical needs in healthcare. It is built on one of the world’s largest and most comprehensive global datasets of healthcare professionals. By combining deep healthcare data with agentic AI workflows, H1 powers clinical research, medical exchange, patients finding doctors, health plan network analytics, and a system of record for provider data, helping create a healthier future for all.
- Series D
- 564 employees
- Founded 2017
9
Veriff· New York, New York, United States
Veriff is the preferred identity verification partner for the world’s biggest and best digital companies, including pioneers in fintech, crypto, gaming and the mobility sectors. We provide advanced technology, deep insights and expertise from our foundation in digital-first Estonia and honed over decades in leading the digital identity revolution.The partner of choice for businesses who need to rapidly and effortlessly verify online users from anywhere in the world, Veriff delivers the widest possible identity document coverage. By supporting government issued IDs from more than 230 countries and territories and with our intelligent decision engine which analyzes thousands of technological and behavioral variables Veriff enables trust from the first hello.We’re a global company with hubs in Europe, the US, and LatAm. We have a robust backing and funding from investors including Accel, Alkeon, IVP, Tiger Capital and Y Combinator, we’re dedicated to helping businesses and individuals build a safer and more secure world. To learn more, visit veriff.com.
- Series C
- 549 employees
- Founded 2015
10
Kalshi· New York, New York, United States
The first US federally regulated exchange where you can trade on the outcome of any event.Kalshi’s historical regulatory approval from the CFTC enables it to offer a new asset class called “event contracts,” which allow traders to take positions on whether a future event will happen or not. Kalshi aims to enable investors to trade on almost anything with economic relevance from Covid numbers to whether a bill will pass in Congress, broadening the historical definition of what a commodity derivative is and paving the way for the futures market to catch up to the novel risks facing the economy today. Kalshi is backed by Sequoia, Henry Kravis, Charles Schwab, and Y Combinator.
- undisclosed
- 531 employees
- Founded 2019

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Y Combinator portfolio companies in New York

Y Combinator’s New York portfolio is one of the most active recruiting pools in the market. The list above ranks Y Combinator-backed companies headquartered in New York by current headcount, drawn from public LinkedIn and Crunchbase records. With 369 matching companies in Refolk’s index, you can see exactly where the Y Combinator thesis has landed locally.

Y Combinator companies in New York tend to attract a specific type of operator - a founder or early hire bought into both the firm’s thesis and the city’s ecosystem. That makes the engineers and designers at these companies particularly valuable signals.

Refolk lets you reach this pool. Ask for “Y Combinator companies in New York hiring founding engineers” or “founders of Y Combinator-backed companies in New York who left in the last year” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled companies whose disclosed Crunchbase investor list includes Y Combinator and whose HQ is in New York, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 10:15:24 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

How fresh is the data?

The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 10:15:24 GMT.

Can I get the full list of 369 companies?

Yes. This page shows the top of the ranking; sign up and I'll run the search live for the complete, current list. You start with 500 free credits, no card required.

Can I find the people inside these companies?

Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.

This list is a starting point