Y Combinator

Professional services

An American startup accelerator and early-stage venture investor that runs structured founder programs and backs technology companies worldwide.

Last updated October 2, 2026

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Overview

Y Combinator is an American startup accelerator and early-stage venture capital firm founded in 2005 by Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell. It began with programs in Cambridge, Massachusetts, and Mountain View, California, before consolidating its operations in Silicon Valley. The organization later moved its headquarters to San Francisco and conducted its program remotely during the COVID-19 pandemic. YC is best known for its batch-based accelerator. Selected founders receive an investment, structured advice, office hours, peer support, access to a large alumni network, and the opportunity to present their companies at Demo Day. The program is designed for very early-stage businesses and emphasizes rapid product development, direct engagement with users, and evidence of product-market fit. YC’s widely circulated startup advice has also made it an influential source of operating principles for technology founders, particularly the ideas of building something users want, doing things that do not scale during the early stage, and prioritizing sustainable user growth over premature advertising. The accelerator’s portfolio spans software, financial technology, consumer internet, enterprise technology, biotechnology, healthcare, education, logistics, robotics, artificial intelligence, and other technology sectors. Alumni companies associated with YC include Airbnb, Dropbox, Stripe, Instacart, Coinbase, DoorDash, Reddit, Twitch, Cruise, and Webflow. Some portfolio companies have reached public markets or been acquired by larger technology companies, helping establish YC as one of the most visible institutions in the startup ecosystem. YC’s investment model has changed over time. Earlier batches received smaller checks in exchange for a stated equity position. In 2022, YC introduced a standard package consisting of $125,000 for a 7% equity stake and a further $375,000 investment through an uncapped safe with a most-favored-nation provision. The arrangement gives YC exposure to companies’ future financing while providing founders with more capital at the beginning of the company-building process. Exact investment terms can vary by program and may change over time. Beyond the accelerator itself, Y Combinator maintains a large public directory of funded companies, publishes essays and founder guidance, operates online resources, and uses media channels such as its website, YouTube, and social platforms to distribute advice, interviews, startup announcements, and requests for applications. Its influence extends beyond direct capital because admission is frequently treated as a reputational signal by founders, employees, customers, and later-stage investors. YC remains a private organization and does not have a public stock ticker.

History

Y Combinator was established in 2005 by Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell. Its initial model was unusual for the period: rather than operating as a traditional venture fund alone, it combined a short, intensive educational program with a small seed investment and a final presentation to investors. The first programs were run concurrently in Cambridge, Massachusetts, and Mountain View, California. Managing two locations proved difficult, and YC closed the Cambridge program in January 2009, concentrating its activity in Silicon Valley. The organization’s early reputation came from its focus on very young software companies and its willingness to fund founders before they had substantial revenue or institutional backing. YC’s program encouraged participants to build quickly, speak directly with users, measure usage, and revise their products repeatedly. Its partner meetings, group sessions, office hours, and Demo Day created a repeatable framework that could be applied to many companies at once. The batch structure also created a continuing alumni community, allowing later founders to learn from earlier participants and giving investors a recognizable source of startup deal flow. Several early portfolio companies became important examples of YC’s model. Airbnb was accepted into the Winter 2009 batch after its founders developed an online marketplace for short-term lodging. Dropbox joined the 2007 batch and became the first YC-backed company to complete an IPO, in 2018. Other well-known alumni and portfolio companies include Stripe, Instacart, Coinbase, DoorDash, Reddit, Twitch, Cruise, and Webflow. These companies helped shift the public image of YC from a small experimental accelerator to a major institution in early-stage technology investing. YC’s leadership and operating model evolved as the organization expanded. Sam Altman succeeded Paul Graham as president and helped scale the program’s reach, portfolio, and public influence. During the COVID-19 pandemic, the accelerator moved its batch activities online, allowing the organization to continue operating without the usual in-person format. In 2019, YC’s operations were associated with San Francisco after its earlier Silicon Valley locations. The standard investment terms also changed. Earlier arrangements commonly involved a smaller investment in return for a stated equity stake. In 2022, YC introduced a package of $125,000 for 7% of the company plus $375,000 through an uncapped safe with a most-favored-nation clause. This structure was intended to give accepted startups a larger initial capital base while preserving YC’s participation in future financing terms. The organization has continued to fund companies across a broad range of fields, with artificial intelligence, enterprise software, financial technology, healthcare, climate technology, robotics, and biotechnology prominent among later cohorts. Y Combinator’s influence is not limited to capital deployment. Its application process, founder essays, public talks, company directory, Startup School materials, and online media have made its operating advice widely accessible. The organization has promoted organic customer discovery and warned founders against using paid acquisition before establishing meaningful product-market fit. Its communications strategy combines long-form educational content with shorter social-media and video formats. YC remains a private accelerator and investment organization, and its continuing role is to identify, train, finance, and connect early-stage founders rather than to operate a consumer product brand.

2022
YC adopts a larger standard startup deal
[2]Y Combinatoren.wikipedia.org
The revised package combines $125,000 for 7% equity with a further $375,000 uncapped safe investment.
2020
The accelerator moves online during the pandemic
[2]Y Combinatoren.wikipedia.org
YC conducts its Summer 2020 batch remotely in response to the COVID-19 pandemic.
2019
YC relocates its operations to San Francisco
[2]Y Combinatoren.wikipedia.org
The organization moves its operational base from its earlier Silicon Valley setting to San Francisco.
2018
Dropbox completes the first YC-backed IPO
[3]CNBC: Y Combinator’s first IPO with Dropboxcnbc.com
Dropbox becomes the first Y Combinator portfolio company to list publicly.
2009
Operations consolidate in Silicon Valley
[2]Y Combinatoren.wikipedia.org
The Cambridge program is closed and YC concentrates its accelerator activities in the Silicon Valley region.
2005
Y Combinator is founded
[2]Y Combinatoren.wikipedia.org
Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell establish Y Combinator as an early-stage startup accelerator.

Products and positioning

A highly selective, globally recognized early-stage accelerator combining standardized founder education, seed capital, an extensive alumni network, and a strong technology-startup brand.

Startup accelerator · 2005
Y Combinator Accelerator
YC’s core offering is a selective, time-limited program for early-stage startups. Participating founders receive capital, structured guidance, peer interaction, partner office hours, and access to a large alumni community. The program culminates in investor-facing presentations and is designed to help companies sharpen their product, understand users, and prepare for subsequent fundraising.
Seed investment · 2022
Standard YC Investment
The standard investment package introduced in 2022 consists of $125,000 in exchange for 7% equity and an additional $375,000 invested through an uncapped safe with a most-favored-nation provision. Terms are intended for companies accepted into the accelerator and may be revised by YC over time.
Founder education
Startup School
Startup School is YC’s educational and community offering for founders and aspiring founders. It provides online material, talks, guidance, and founder-oriented resources based on YC’s experience working with early-stage technology companies. It extends access to YC-style advice beyond the companies selected for a standard batch.
Educational content
YC Founder Library and Media
YC publishes essays, interviews, lectures, application guidance, startup recommendations, and video programming through its website and external media channels. This content covers product development, customer discovery, hiring, fundraising, growth, and company leadership.

Marketing campaigns

2025Request for Startups
Global
YC promoted a 2025 Request for Startups through its website and email communications, highlighting areas of interest and encouraging founders to apply to its accelerator.
Source
Founder education and content distribution
Global
YC uses essays, founder interviews, talks, newsletters, YouTube, and social platforms to distribute practical startup advice and promote its programs. Content is often adapted across channels so that long-form discussions can reach audiences through shorter video and social formats.
Outcome. The approach has strengthened YC’s public identity as both an accelerator and a source of startup education, while supporting awareness of its application process and alumni network.
Source

Brand decisions

2022
Introduction of the revised standard investment dealOther
Background
YC sought to provide accepted startups with substantially more initial capital while retaining a standardized ownership position.
Action taken
The organization introduced $125,000 for 7% equity and an additional $375,000 through an uncapped safe with an MFN clause.
Aftermath
The package increased the capital available to companies at entry and became a defining feature of YC’s modern accelerator economics.
Standard investment package. $500,000 total stated package (Introduced in 2022)
Source
2020
Remote accelerator delivery during COVID-19Strategy
Background
Public-health restrictions made the normal in-person accelerator format impractical.
Action taken
YC conducted its Summer 2020 batch remotely.
Aftermath
The move demonstrated that YC could deliver its batch, mentoring, and investor activities online.
Source
2009
Consolidation of accelerator operationsStrategy
Background
Running simultaneous programs in Cambridge and Mountain View created operational complexity for the young accelerator.
Action taken
YC closed the Cambridge program and centralized operations in Silicon Valley.
Aftermath
The consolidation gave YC a single operating center and supported the subsequent scaling of its batch model.
Source

Recent events

Unconfirmed
Infina closes US$6 million seed funding round[8]Infina 完成 600 万美元种子轮融资financialit.net
Vietnam-focused investing app Infina announced that it had closed a US$6 million seed funding round. The round included Sequoia Capital India's Surge, Y Combinator, Saison Capital, Starling Ventures, Alpha JWC, and AppWorks, among other investors.
2022-02-01
Tint raises $25 million in Series B funding[9]Tint完成2500万美元B轮融资crowdfundinsider.com
Reported: 2022-02-02
Tint raised $25 million in a Series B round led by QED Investors, with existing investors also participating. The funding is intended to boost platform growth.
Unconfirmed
LiveFlow raises $3.5 million in seed funding[10]LiveFlow 获得 350 万美元种子资金accountingtoday.com
Reported: 2021-12-29
LiveFlow raised $3.5 million in seed funding to build a management hub for automating financial reporting. The round was led by Moonfire Ventures and backed by Y Combinator, Seedcamp, WndrCo, and executives from Google, Square, Lyft and Klarna.
2021-12-16
PropReturns raises $1.2 million[11]PropReturns 获得 120 万美元融资realty.economictimes.indiatimes.com
Reported: 2021-12-16
PropReturns, a real estate investment platform, said it raised USD 1.2 million from a group of investors including Y Combinator, GoodWater Capital and Soma Capital.
Unconfirmed
Snazzy raises $2.2 million in seed funding[12]Snazzy完成220万美元种子轮融资inc42.com
Reported: 2021-12-08
Dental care startup Snazzy raised $2.2 million in a seed funding round. The article names Y Combinator, Form Capital, Goodwater Capital and ANIM Fund among the investors, along with individual participants.
2021-12-07
Jupe raises $9.5 million in seed funding[13]Jupe获得950万美元种子轮融资prnewswire.com
Reported: 2021-12-07
Jupe announced that it raised $9.5 million in seed funding led by Initialized Capital, with participation from Y Combinator. The company said it would use the funds to hire and execute its mission.
2021-11-22
Fractional raises $5.5 million in seed funding[14]Fractional 获得 550 万美元种子轮融资inman.com
Reported: 2021-11-23
Fractional raised $5.5 million in seed funding as it looked to expand. The funding round was led by CRV alongside other investors.
2021-11-17
SalaryBox raises $4 million in seed funding[15]SalaryBox 筹集 400 万美元种子轮融资dailyexcelsior.com
Reported: 2021-11-18
SalaryBox said it had raised $4 million in seed funding from Y Combinator, AME Cloud Ventures, Soma Capital, 2AM Ventures and others.
Unconfirmed
Y Combinator acquires a 7% stake in Chari[16]Y Combinator 收购 Chari 7% 股份cairoscene.com
San Francisco-based seed investor and accelerator Y Combinator acquired a 7% share in Moroccan B2B e-commerce startup Chari.
2021-06-29
Stayflexi raises $1.6 million in seed funding[17]Stayflexi获得160万美元种子轮融资prweb.com
Reported: 2021-06-29
Stayflexi announced that it raised $1.6 million in seed funding from a group of investors.

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