Y Combinator
American startup accelerator
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| March 22 2025 | As of the current date, Y Combinator remains an active and influential startup accelerator in the global technology ecosystem. |
| 2024 | The accelerator program continues to identify and support promising startup ventures in the technology sector. |
| March 2024 | Michael Seibel stepped down as managing director. |
| 2023 | Y Combinator moved its headquarters from Mountain View to San Francisco in the spring. |
| 2023 | Y Combinator maintains its position as a leading startup accelerator, supporting emerging technology companies and entrepreneurs. |
| March 2023 | YC Continuity Fund was shut down, with staff being laid off. |
| January 2023 | Garry Tan assumed the positions of president and CEO, succeeding Geoff Ralston, and discontinued the YC Continuity growth fund. |
| 2022 | Y Combinator deliberately reduced its startup intake by 40%, from 414 companies to 250 in the summer batch. |
| 2022 | The startup accelerator continues to play a significant role in nurturing early-stage technology startups across various industries. |
| January 2022 | Y Combinator introduced a revised standard deal of $500,000, comprising $125,000 for a 7% equity stake and an additional $375,000 via an uncapped safe mechanism. |
| 2021 | Start of the 2021-2025 period covered in the Y Combinator startups list, indicating an ongoing compilation of notable startup companies supported by Y Combinator during this timeframe. |
| 2021 | Y Combinator continues to be a prominent startup accelerator, supporting and funding numerous innovative technology companies during this period. |
| 2020 | Conducted the summer batch remotely in response to the COVID-19 pandemic. |
| 2020 | YC Research disaffiliated from Y Combinator and was renamed to Open Research. |
| 2020 | During the COVID-19 pandemic, Y Combinator transitioned to operating entirely online. |
| 2019 | Michael Nielsen concluded his research fellowship at YC Research. |
| 2019 | Geoff Ralston succeeded Sam Altman as Y Combinator's president. |
| 2019 | Y Combinator expanded its physical presence to San Francisco. |
| 2019 | Our World in Data, a scientific online publication focusing on global issues, was admitted to Y Combinator startup accelerator program. |
| 2019 | Upsolve, a non-profit technology startup providing legal assistance for bankruptcy filing, was admitted to Y Combinator startup accelerator program. |
| February 2019 | Y Combinator Winter 2019 batch featured multiple launch events, with separate batches of 9, 13, and 17 companies being highlighted in press coverage. |
| 2018 | A software glitch led to all 15,000 startup applicants being initially accepted and then rejected, ultimately resulting in Y Combinator accepting all 15,000 companies. |
| 2018 | Rappi, a Latin American on-demand delivery startup, was part of the Y Combinator cohort, marking its significant growth and international expansion. |
| December 2018 | Y Combinator Winter 2018 batch featured multiple groups of startup launches, with 13 companies highlighted in various press coverage. |
| August 2018 | Y Combinator hosted Summer 2018 Batch Demo Days, with startups launching across two separate demo day events, presenting a total of 122 startups (63 on Demo Day 1 and 59 on Demo Day 2). |
| 2017 | The Human Advancement Research Community (HARC) project was shut down. |
| 2017 | YC introduced the Series A program to support startups in their next funding stage. |
| 2017 | Y Combinator discontinued the YC Fellowship Program. |
| 2017 | YC created Work at a Startup, a platform to connect talent with startup opportunities. |
| 2017 | YC established YC China, expanding their startup accelerator program internationally. |
| 2017 | YC launched the YC Growth program to support scaling startups. |
| 2017 | Startup School was introduced, providing online courses and personalized coaching to startups, with over 1500 startups graduating in its first year. |
| 2017 | Brex was founded and accepted into the Y Combinator program, launching its corporate credit card and expense management platform for startups. |
| 2017 | Replit was accepted into the Y Combinator startup batch, expanding its online integrated development environment (IDE) platform. |
| 2016 | Michael Nielsen, an Australian quantum physicist, began his role as a research fellow at YC Research. |
| 2016 | The Human Advancement Research Community (HARC) project was established with a mission to ensure human wisdom exceeds human power, inspired by a conversation between Sam Altman and Alan Kay. |
| 2016 | YC partners visited 11 countries (Nigeria, Denmark, Portugal, Sweden, Germany, Russia, Argentina, Chile, Mexico, Israel, and India) to engage with founders and learn about international startup communities. |
| 2016 | Boom Technology was part of the Y Combinator startup batch, indicating the company's entry into the Y Combinator accelerator program during this period. |
| January 2016 | OpenAI was launched as the first project of YC Research, and a second research project on basic income was announced. |
| January 2016 | YC modified the Fellowship Program to provide $20,000 investment for a 1.5 percent equity stake, with conversion contingent on specific financial milestones. |
| October 2015 | Y Combinator introduced YC Research to fund long-term fundamental research, with Sam Altman donating $10 million to support the initiative. |
| October 2015 | Y Combinator introduced the YC Continuity Fund to make pro rata investments in alumni companies. |
| August 2015 | Y Combinator held its Summer 2015 Demo Day, featuring multiple startup batches presenting their companies across two separate demo day events. |
| July 2015 | Y Combinator launched the YC Fellowship Program, providing an equity-free grant to 32 early-stage companies in its first batch. |
| 2014 | Sam Altman was appointed President of Y Combinator by Paul Graham, and introduced a new equity offering of $150,000 for a 7% stake. |
| September 2013 | Y Combinator began funding nonprofit organizations after testing the concept with Watsi. |
| January 2013 | Michael Seibel joined Y Combinator as a part-time partner. |
| 2011 | Yuri Milner and SV Angel offered every Y Combinator company a $150,000 convertible note investment, later changed to $80,000. |
| 2010 | Sequoia Capital provided an additional $8.25 million funding round to support Y Combinator's growing startup ecosystem. |
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