Y Combinator (YC) is an American technology
startup accelerator
Startup accelerators, also known as seed accelerators, are fixed-term, cohort-based programs, that include mentorship and educational components and culminate in a public pitch event or demo day. While traditional business incubators are often ...
launched in March 2005. It has been used to launch more than 3,000 companies,
including
Airbnb
Airbnb, Inc. ( ), based in San Francisco, California, operates an online marketplace focused on short-term homestays and experiences. The company acts as a broker and charges a commission from each booking. The company was founded in 2008 by ...
,
Coinbase,
Cruise
A cruise is any travel on a cruise ship.
Cruise or Cruises may also refer to:
Tourism
* Booze cruise
* Music cruise
* River cruise
Aeronautics and aircraft
* Cruise (aeronautics), a distinct stage of an aircraft's flight
* Aviasouz Cruise, a R ...
,
DoorDash,
Dropbox
Dropbox is a file hosting service operated by the American company Dropbox, Inc., headquartered in San Francisco, California, U.S. that offers cloud storage, file synchronization, personal cloud, and client software. Dropbox was founded in 2 ...
,
Instacart
Instacart is an American company that operates a grocery delivery and pick-up service in the United States and Canada. The company offers its services via a website and mobile app. The service allows customers to order groceries from participat ...
,
Quora
Quora () is a social question-and-answer website based in Mountain View, California. It was founded on June 25, 2009, and made available to the public on June 21, 2010. Users can collaborate by editing questions and commenting on answers that ...
,
PagerDuty,
Reddit
Reddit (; stylized in all lowercase as reddit) is an American social news news aggregator, aggregation, Review site#Rating site, content rating, and Internet forum, discussion website. Registered users (commonly referred to as "Redditors") subm ...
,
Stripe
Stripe, striped, or stripes may refer to:
Decorations
* Stripe (pattern), a line or band that differs in colour or tone from an adjacent surface
* Racing stripe, a vehicle decoration
* Service stripe, a decoration of the U.S. military
Entertainme ...
and
Twitch
Twitch may refer to:
Biology
* Muscle contraction
** Convulsion, rapid and repeated muscle contraction and relaxation
** Fasciculation, a small, local, involuntary muscle contraction
** Myoclonic twitch, a jerk usually caused by sudden muscle co ...
. The combined valuation of the top YC companies was more than $300 billion by January 2021.
The company's accelerator program started in
Boston
Boston (), officially the City of Boston, is the capital city, state capital and List of municipalities in Massachusetts, most populous city of the Commonwealth (U.S. state), Commonwealth of Massachusetts, as well as the cultural and financ ...
and
Mountain View, expanded to
San Francisco
San Francisco (; Spanish language, Spanish for "Francis of Assisi, Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the List of Ca ...
in 2019, and has been entirely online since the start of the
COVID-19
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by a virus, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China, in December 2019. The disease quickl ...
pandemic. ''Forbes'' characterized the company in 2012 as one of the most successful startup accelerators in
Silicon Valley
Silicon Valley is a region in Northern California that serves as a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical areas San Mateo Count ...
.
History

Y Combinator was founded in 2005 by
Paul Graham,
Jessica Livingston,
Robert Tappan Morris
Robert Tappan Morris (born November 8, 1965) is an American computer scientist and entrepreneur. He is best known for creating the Morris worm in 1988, considered the first computer worm on the Internet.
Morris was prosecuted for releasing th ...
, and
Trevor Blackwell.
From 2005 to 2008, one program was in
Cambridge, Massachusetts
Cambridge ( ) is a city in Middlesex County, Massachusetts, United States. As part of the Greater Boston, Boston metropolitan area, the cities population of the 2020 United States Census, 2020 U.S. census was 118,403, making it the fourth most ...
, and one was in
Mountain View, California
Mountain View is a city in Santa Clara County, California, United States. Named for its views of the Santa Cruz Mountains, it has a population of 82,376.
Mountain View was integral to the early history and growth of Silicon Valley, and is th ...
. As Y Combinator grew to 40 investments per year, running two programs became too much. In January 2009, Y Combinator announced that the Cambridge program would be closed and all future programs would be in Silicon Valley.
In 2009,
Sequoia Capital
Sequoia Capital is an American venture capital firm. The firm is headquartered in Menlo Park, California, and specializes in seed stage, early stage, and growth stage investments in private companies across technology sectors. , Sequoia's total a ...
led the $2 million investment round into an entity of Y Combinator to enable it to invest in approximately 60 companies a year. In 2010, Sequoia led an $8.25 million funding round for Y Combinator to further increase the number of startups the company could fund.
In 2011,
Yuri Milner
Yuri Borisovich (Bentsionovich) Milner (russian: Юрий Борисович (Бенционович) Мильнер; born 11 November 1961) is a Soviet-born Israeli entrepreneur, venture capitalist and physicist. He is a cofounder and former c ...
and SV Angel offered every Y Combinator company a $150,000 convertible note investment. The amount put into each company was changed to $80,000 when Start Fund was renewed.
In September 2013, Y Combinator began funding nonprofit organizations that were accepted into the program after testing the concept with
Watsi.
In 2014,
Sam Altman
Samuel H. Altman ( ; born April 22, 1985) is an American entrepreneur, investor, programmer, and blogger. He is the CEO of OpenAI and the former president of Y Combinator.
Early life and education
Altman grew up in St. Louis, Missouri; his mo ...
replaced Graham as president of Y Combinator.
In 2014, Y Combinator began a new deal for startups, offering $150,000 for 7 percent
equity.
In 2014, Altman announced a partnership with Transcriptic to provide increased support for Y Combinator's growing community of biotech companies. In 2015, he announced a partnership with Bolt and increased support for hardware companies.
The YC Fellowship Program was announced in July 2015, with the goal of funding companies at the idea or prototype stage.
The first batch of YC Fellowship included 32 companies that received an equity-free grant instead of an investment.
In January 2016, Y Combinator changed the fellowship program, with participating companies receiving $20k investment for a 1.5 percent equity stake. The equity stake is structured as a
convertible security that converts into shares only if a company has an
initial public offering
An initial public offering (IPO) or stock launch is a public offering in which shares of a company are sold to institutional investors and usually also to retail (individual) investors. An IPO is typically underwritten by one or more investme ...
(IPO), or a funding event or acquisition that values the company at $100 million or more. The fellowship was discontinued in 2017.
In 2016, Y Combinator announced that YC partners would visit 11 countries to meet with founders and learn more about how they could be helpful to international startup communities. Those 11 countries were
Nigeria
Nigeria ( ), , ig, Naìjíríyà, yo, Nàìjíríà, pcm, Naijá , ff, Naajeeriya, kcg, Naijeriya officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf of G ...
,
Denmark
)
, song = ( en, "King Christian stood by the lofty mast")
, song_type = National and royal anthem
, image_map = EU-Denmark.svg
, map_caption =
, subdivision_type = Sovereign state
, subdivision_name = Kingdom of Denmark
, establishe ...
,
Portugal
Portugal, officially the Portuguese Republic, In recognized minority languages of Portugal:
:* mwl, República Pertuesa is a country located on the Iberian Peninsula, in Southwestern Europe, and whose territory also includes the Macaronesian ...
,
Sweden,
Germany
Germany, officially the Federal Republic of Germany (FRG),, is a country in Central Europe. It is the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the sou ...
,
Russia
Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eigh ...
,
Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, t ...
,
Chile
Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the eas ...
,
Mexico
Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guate ...
,
Israel
Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...
, and
India
India, officially the Republic of India ( Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the ...
.
Former Twitter chief financial officer and chief operating officer
Ali Rowghani
Ali Rowghani ( fa, علی روغنی, born 21 January 1973) is an Iranian-born American businessman.
He was raised in Dallas, Texas, where he attended the St. Mark's School of Texas, graduating in 1991. He received his undergraduate degree from ...
, who was in charge of the YC Continuity Fund when it began, became CEO of YC Continuity.
Michael Seibel
Michael Seibel (born October 7, 1982) is a managing director at Y Combinator and co-founder of two startups – Justin.tv/ Twitch and Socialcam. He first joined Y Combinator in 2013, advising hundreds of startups, and has been active in promot ...
, who co-founded
Justin.tv, became CEO of YC Core, the program that
Paul Buchheit had run since 2016.
In 2017, Y Combinator began Startup School, an online course that released public videos and coached individual startups. More than 1500 startups graduated the program in its first year.
In 2018, Y Combinator announced a new batch of startup school. After a software glitch, all 15,000 startups that applied to the program were accepted, only to learn a few hours later that they had been rejected. But the ensuing outcry led Y Combinator to change course again and decided over an official blog to accept all those 15,000 companies. Now, every company is accepted to join YC Startup School without any restrictions.
In 2019,
Geoff Ralston replaced Altman as president of Y Combinator.
The summer 2020 batch was conducted remotely via
videotelephony
Videotelephony, also known as videoconferencing and video teleconferencing, is the two-way or multipoint reception and transmission of audio and video signals by people in different locations for real time communication.McGraw-Hill Concise Enc ...
due to the
COVID-19 pandemic
The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The novel virus was first identified ...
.
In the summer of 2022, Y Combinator intentionally shrunk the number of startups within its accelerator down 40% from 414 companies to 250 companies.
Programs
Y Combinator interviews and selects two or more batches of companies per year. The companies receive total of $500,000
seed money as well as advice, and connections. The companies receive $125,000 on a post-money
safe
A safe (also called a strongbox or coffer) is a secure Lock (security device), lockable box used for securing valuable objects against theft or fire. A safe is usually a hollow cuboid or cylinder, with one face being removable or hinged to form ...
in return for 7%
equity and $375,000 on an uncapped safe with a
Most Favored Nation (MFN) provision. Non-profits receive $100,000 donation. The program includes "office hours", where startup founders meet individually and group meetings. Founders also participate in weekly dinners where guests from the
Silicon Valley
Silicon Valley is a region in Northern California that serves as a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical areas San Mateo Count ...
ecosystem (successful entrepreneurs, venture capitalists, etc.) speak to the founders.
Y Combinator's motto is "Make Something People Want." The program teaches founders to market their product, team and market, refining their business model, achieving
product/market fit
Product/market fit, also known as product-market fit, is the degree to which a product satisfies a strong market demand.
Product/market fit has been identified as a first step to building a successful venture in which the company meets early adopt ...
, and scaling the startup into a
high growth business, etc. The program ends with Demo Day, where startups present their business and sometimes technology to potential investors.
The Y combinator operates an additional program and fund designed to support and invest in startups which have already graduated from the main accelerator program. The YC Growth Program and YC Continuity fund are operated by the same team and focus on helping fast growing startups which are approaching 50 employees, and startups raising their Series B funding of $20 million to $100 million.
Y Combinator has introduced additional programs since 2015, including:
* In July 2015, Y Combinator introduced the YC Fellowship Program aimed at companies at an earlier stage than the main program.
* In October 2015, Y Combinator introduced the YC Continuity Fund. The fund allows Y Combinator to make
pro rata
''Pro rata'' is an adverb or adjective meaning in equal portions or in proportion. The term is used in many legal and economic contexts. The hyphenated spelling ''pro-rata'' for the adjective form is common, as recommended for adjectives by some E ...
investments in their alumni companies with valuations under $300 million. Y Combinator will also consider leading or participating in later stage growth financing rounds for YC companies.
* Nonprofit research lab YC Research was announced in October 2015. Researchers are paid as full-time employees and can receive equity in Y Combinator.
OpenAI
OpenAI is an artificial intelligence (AI) research laboratory consisting of the for-profit corporation OpenAI LP and its parent company, the non-profit OpenAI Inc. The company conducts research in the field of AI with the stated goal of promo ...
was the first project undertaken by YC Research, and in January 2016 a second study on
basic income
Universal basic income (UBI) is a social welfare proposal in which all citizens of a given population regularly receive an unconditional transfer payment, that is, without a means test or need to work. It would be received independently of a ...
was also announced. Another project is research on new cities. Australian quantum physicist
Michael Nielsen is a research fellow at YC Research since 2017.
* In October 2015, YC introduced YC Research to fund long-term fundamental research. YC President
Sam Altman
Samuel H. Altman ( ; born April 22, 1985) is an American entrepreneur, investor, programmer, and blogger. He is the CEO of OpenAI and the former president of Y Combinator.
Early life and education
Altman grew up in St. Louis, Missouri; his mo ...
donated $10m.
*During 2017–2019, YC launched Startup School, the Series A program, the YC Growth program, Work at a Startup, and YC China.
*In March 2019, it was reported that Y Combinator was moving headquarters to San Francisco.
As of late 2021, Y Combinator had invested in >3,000 companies,
most of which are for-profit. Non-profit organizations can also participate in the main YC program. Few non-profits have been accepted in the last years, among them
Watsi,
Women Who Code,
New Story,
SIRUM
SIRUM (Supporting Initiatives to Redistribute Unused Medicine) is a non-profit social enterprise started by Stanford University students to decrease the amount of medicine going to waste in the U.S. by redistributing unused, unexpired drugs to ...
,
Zidisha
Zidisha allows people to lend small amounts of money directly to entrepreneurs in developing countries. It is the first peer-to-peer microlending service to link borrowers and lenders across international borders without a local microfinance inst ...
,
80,000 Hours
80,000 Hours is a London-based nonprofit organisation that conducts research on which careers have the largest positive social impact and provides career advice based on that research. It provides this advice on their website and podcast, and ...
, and
Our World in Data
Our World in Data (OWID) is a scientific online publication that focuses on large global problems such as poverty, disease, hunger, climate change, war, existential risks, and inequality.
It is a project of the Global Change Data Lab, a r ...
.
People
Y Combinator was founded in March 2005 by
Paul Graham,
Jessica Livingston,
Robert Morris and
Trevor Blackwell.
In 2010, Kirsty Nathoo joined as an accountant and became CFO in 2012.
In early 2010, Harj Taggar joined as an advisor. In September 2010,
Alexis Ohanian
Alexis Kerry Ohanian ( hy, Ալեքսիս Քերի Օհանյան; born April 24, 1983) is an American internet entrepreneur and investor. He is best known as the co-founder and executive chairman of the social media site Reddit along with St ...
joined. In November 2010,
Paul Buchheit and Harj Taggar were named partners. In 2015, Taggar left YC.
In January 2011,
Garry Tan joined YC, first as designer-in-residence and later as partner.
He left YC in November 2015.
Later in 2011,
Aaron Iba joined as a partner.
In February 2014, Sam Altman became president of Y Combinator.
Michael Seibel
Michael Seibel (born October 7, 1982) is a managing director at Y Combinator and co-founder of two startups – Justin.tv/ Twitch and Socialcam. He first joined Y Combinator in 2013, advising hundreds of startups, and has been active in promot ...
joined Y Combinator as part-time partner in January 2013 and later became a full-time Partner in 2014.
The company includes managing directors, group partners, visiting group partners and team members as listed on its website.
In 2018, Y Combinator announced that
Lu Qi, a former CEO of
Baidu
Baidu, Inc. ( ; , meaning "hundred times") is a Chinese multinational technology company specializing in Internet-related services and products and artificial intelligence (AI), headquartered in Beijing's Haidian District. It is one of th ...
and
Bing, would join the company as CEO of YC China. Y Combinator announced that Lu left YC in November 2019 and that it had decided not to pursue a program in China.
In March 2019, Y Combinator announced its president Sam Altman would be transitioning into a Chairman position to focus more on
OpenAI
OpenAI is an artificial intelligence (AI) research laboratory consisting of the for-profit corporation OpenAI LP and its parent company, the non-profit OpenAI Inc. The company conducts research in the field of AI with the stated goal of promo ...
and
Geoff Ralston would be the new president.
Controversies
Y Combinator has been blamed for its encouragement of the
ageism
Ageism, also spelled agism, is discrimination against individuals or groups on the basis of their age. The term was coined in 1969 by Robert Neil Butler to describe discrimination against seniors, and patterned on sexism and racism. Butler de ...
culture in Silicon Valley. Paul Graham said in 2005 that people over 38 lacked the energy to launch startups. It was also at a Y Combinator event, the 2007 Startup School, that
Mark Zuckerberg
Mark Elliot Zuckerberg (; born ) is an American business magnate, internet entrepreneur, and philanthropist. He is known for co-founding the social media website Facebook and its parent company Meta Platforms (formerly Facebook, Inc.), of ...
said, "Young people are just smarter". Research on this issue published by ''
Harvard Business Review
''Harvard Business Review'' (''HBR'') is a general management magazine published by Harvard Business Publishing, a wholly owned subsidiary of Harvard University. ''HBR'' is published six times a year and is headquartered in Brighton, Ma ...
'' found Y Combinator's views to be misguided, as the average age of a successful startup founder was found to be 45 years old.
Open Research
The Human Advancement Research Community (HARC) project was set up with the "mission to ensure human wisdom exceeds human power". The project was inspired by a conversation between Sam Altman and
Alan Kay
Alan Curtis Kay (born May 17, 1940) published by the Association for Computing Machinery 2012 is an American computer scientist best known for his pioneering work on object-oriented programming and windowing graphical user interface (GUI) d ...
. Its projects include modelling, visualizing and teaching software, as well as programming languages. Members included Alan Kay,
Bret Victor
Bret Victor is an interface designer, computer scientist, and electrical engineer known for his talks on the future of technology. , he worked as a researcher at Dynamicland.
Career
Bret Victor earned his bachelor's degree in electrical engin ...
, and
Vi Hart.
Patrick Scaglia was chair of HARC and was listed as an advisor in 2017. YC Research disaffiliated with Y Combinator and now operates as Open Research.
See also
*
Hacker News
*
List of Y Combinator startups
The following notable startups have completed the Y Combinator Accelerator program.
Mike Isaac described Y Combinator as: "Y Combinator accepts batches of start-ups twice a year in a semester-like system and gives them money, advice and access to ...
*
Entrepreneurs Roundtable Accelerator
Entrepreneurs Roundtable Accelerator (aka ER Accelerator, or ERA) is an American seed accelerator launched in January 2011.
ERA runs two four-month startup accelerator programs per year, the first starting in January ("winter program") and the ...
*
Techstars
*
500 Startups
*
HighTechXL
References
External links
*
Wonderful Performance formerly Y Combinator China
{{Authority control
Business incubators of the United States
Startup accelerators
Venture capital firms of the United States
Financial services companies based in California
Companies based in Mountain View, California
Financial services companies established in 2005
2005 establishments in California