Y Combinator

Y Combinator

Seed-stage startup accelerator and investor

Overview

Y Combinator is a startup accelerator that funds early-stage companies through seed investments and a three-month, batch-based program. Founders receive mentorship, guidance on product and business strategy, and a Demo Day to present to invited investors. The program runs four times a year, creating a strong network effect among participants who can support one another and share experiences. The accelerator’s portfolio spans software, fintech, biotech, and consumer products, with notable alumni including Stripe, Airbnb, and Coinbase. Unlike many investors, Y Combinator combines a small equity stake with access to a vast alumni and investor network, monetizing returns from successful exits such as acquisitions or IPOs. Its goal is to identify high-potential ventures, help them grow, and generate meaningful financial returns for its stakeholders through exits.

About Y Combinator

Simplify's Rating
Why Y Combinator is rated
B+
Rated A on Competitive Edge
Rated B on Growth Potential
Rated B on Differentiation

Industries

Venture Capital

Financial Services

Company Size

1,001-5,000

Company Stage

Pre-seed

Total Funding

$44.1B

Headquarters

Mountain View, California

Founded

2005

Simplify Jobs

Simplify's Take

What believers are saying

  • Batch cohorts create dense peer learning and faster problem-solving.
  • Demo Day gives startups concentrated access to investors and partners.
  • Post-program support improves follow-on financing and long-term founder retention.

What critics are saying

  • Standardized terms lose appeal against larger, less dilutive seed rounds.
  • Brand weakens if YC stops producing breakout companies like Airbnb.
  • Remote work and travel frictions erode the San Francisco cohort effect.

What makes Y Combinator unique

  • YC invests $500,000 in each startup and runs four batches yearly.
  • Its three-month program compresses product, hiring, and fundraising execution.
  • A large alumni network sustains founders beyond Demo Day.

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Funding

Total Funding

$44.1B

Above

Industry Average

Funded Over

0 Rounds

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Life Insurance

Disability Insurance

Health Savings Account/Flexible Spending Account

Unlimited Paid Time Off

Paid Holidays

401(k) Retirement Plan

401(k) Company Match

Parental Leave

Fertility Treatment Support

Commuter Benefits

Company News

Kindred Capital
May 19th, 2026
Corgi: Rebuilding Insurance with AI

Kindred is thrilled to announce our investment in Corgi as part of their $108M Seed and Series A rounds. After leading their Seed round, we’re excited to back them again alongside YCombinator, Contrary, Oliver Jung, SV Angel, Phosphor Capital, and others, with support from an incredible group of angels, after recently receiving regulatory approval to launch the first AI-native, full-stack insurance carrier built for startups

Vapi
May 12th, 2026
AGI is here. Why am I still on hold?

Read AGI is here. Why am I still on hold? on the Vapi blog

Portage
May 11th, 2026
Happl raises $11M Series A led by Portage to simplify global employee benefits for multinational employers

Happl, a global employee benefits operating system, has raised $11 million in a Series A round led by Portage Ventures. Y Combinator, 6 Degrees Capital, Haatch and Ventures Together also participated. Founded in 2022 by Ben Towers MBE, Happl provides an AI-powered platform that helps HR and finance teams manage employee benefits eligibility, compliance and administration across over 160 countries. The system replaces fragmented country-by-country processes with unified infrastructure designed for multinational employers. The London-based company, which also operates in New York, serves enterprise clients including Moelis, Kainos and Hootsuite. The funding will support product development and international expansion as demand grows for modernised benefits management infrastructure amongst global organisations.

Daring Fireball
May 8th, 2026
Y Combinator’s Stake in OpenAI

The fact that Paul Graham personally has billions of dollars at stake with OpenAI doesn’t mean that his public opinion on Sam Altman’s trustworthiness and leadership is invalid. But it certainly seems like the sort of thing that ought to be disclosed when quoting Graham as an Altman character reference.

Signature Block
Apr 20th, 2026
Why they invested: Deel

Deel grew from $0 to $500M ARR in 5 years. Here's a breakdown of why VCs invested.

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