Y Combinator cofounder, Jessica Livingston, once interviewed her husband and cofounder, Paul Graham

Y Combinator was founded in 2005 to bridge gaps between founders and investors

In one of Paul Graham’s essays on his website, he took the time to explain how and why he and his cofounders (including his girlfriend at the time, and now wife, Jessica Livingston), came up with the idea of and eventually created Y Combinator.

Y Combinator, the startup accelerator, gets its name from the 'Y combinator' computer science concept.

Y Combinator cofounder Paul Graham keeps a public archive of his insightful essays

In addition to cofounding Y Combinator and other companies before it, Paul Graham is a prolific writer and artist. He chronicled many of his thoughts while building Y Combinator in a series of dozens of candid essays, all of which you can read in an online archive.

YC was partly inspired by an investor named Julian Weber

Y Combinator Cofounder Paul Graham’s former professor’s husband Julian Weber provided $10K in seed funding to Graham’s previous startup, Viaweb in its early days. In exchange, Weber received 10% of the company. Weber’s involvement inspired Graham to start a program where investors were more involved with the companies they contributed seed funding to.

Read Paul Graham’s initial post announcing YC’s first batch

In March 2005, Y Combinator cofounder Paul Graham announced the program that would become Y Combinator on his website.

Listen to a podcast episode where Y Combinator CEO Gary Tan explains why YC tends to outperform many other Silicon Valley startup accelerators.

CEO Gary Tan explains Y Combinators guiding philosophy

Hear YC President and CEO Garry Tan talk about why he values earnesty and excellent communication skills in YC founders, his thoughts on AI, and more in this unexpectedly deep and in-depth interview.

Y Combinator changed the way startups around the world are built

Many of the philosophies that the leaders of Y Combinator have infused into the program’s portfolio companies have become the playbook for building the next big thing, such as its focus on founder personality and more.

Stanford’s ‘How to Start a Startup’ series

Stanford’s archive of lectures about creating a startup includes advice from Y Combinator notables such as former YC president and OpenAI CEO Sam Altman and YC Cofounder Paul Graham.

For Reddit's founders, the company's early days included choosing a dinner with Y Combinator's Paul Graham over a spring break trip, a $10M Condé Nast acquisition, and other pivotal moments.

Visualize where the first batch of founders from the famous startup accelerator Y Combinator are now.

'Founder mode' is the idea that startup founders should take a hands-on approach to running their businesses

In 2024, Y Combinator cofounder Paul Graham popularized the idea of "founder mode" when he wrote a viral manifesto in response to a talk that Airbnb CEO Brian Chesky gave about leadership styles. Graham positioned the concept of founder mode as the opposite of manager mode—when founders hire executives and middle managers to run their companies and make decisions that Graham says are better left to founders.

'Founder mode' is the idea that founders should take a hands-on approach to running their businesses

In 2024, Y Combinator Cofounder Paul Graham wrote a viral manifesto of sorts about a strategy he calls "founder mode." It's the opposite of what Graham calls "manager mode," which allows founders to hire executives who he says ultimately run the company into the ground.

The Y Combinator startup directory includes every company YC has funded

The startup accelerator has funded more than 5,000 companies over the years. This YC-specific search engine lets you look up any company to find out if it's a YC alum.

Yahoo acquired Paul Graham's former startup Viaweb in 1998

Viaweb was the web app tech startup that Paul Graham, Robert Morris, and Trevor Blackwell cofounded before they started Y Combinator. The company sold for $49M and Viaweb was rebranded as the Yahoo Store.

Startup accelerators that include more training activities, such as pitch competitions, tend to have better long-term success rates

That's according to a new study from Wharton. Y-Combinator, perhaps the most famous startup accelerator, currently has 16 alumni companies trading on the public market. But not every entrepreneur who joins a startup accelerator makes it big.

Explore the schedule of a three-month YC batch

During the three months that founders accepted into Y Combinator spend on YC’s California campus, they receive mentorship from YC partners, networking opportunities, and, overall, a ton of time to build and scale their companies.

Mark Zuckerberg met his wife, Priscilla Chan, at Harvard

In Zuckerberg's 2017 commencement speech at Harvard, Zuckerberg said his best memory at Harvard was meeting Priscilla Chan in line for the bathroom at a party. In that speech, he said he told her, "I'm going to get kicked out in three days, so we need to go on a date quickly." The pair got married in 2012 and now have three kids together.

Startup accelerators offer mentorship and seed funding in exchange for equity

Those programs, such as Y Combinator and Techstars, not only offer expert advice to founders, but also seed funding in exchange for equity. The goal is to help young startups learn from successful companies, making it more likely they attract venture capital.

ChatGPT was conceived over dinner at a Silicon Valley hotel.

Y Combinator has a roughly 1% acceptance rate

That’s lower than the most elite universities and colleges in the world—but insiders have some tips about how applicants can have the best shot of being accepted to the selective startup accelerator.

Andreessen Horowitz is among the most well-known venture capital firms

Also known as a16z, the firm has invested in companies such as Airbnb, Facebook, and Lyft since its founding in 2009. A podcast episode offers a deep dive into how the firm got started and became the industry disruptor it is today.

Listen to an interview with Martha Graham from 1974

This interview, from the "Bernard Gabriel Views the Music Scene" program, features a candid conversation in which Graham discusses how her career did not take off until her 30s and how she learned to ignore criticism.

Dive deep into the numbers that shape each YC deal

Y Combinator invests $500K into each company in any given batch. $125K of that investment converts into a fixed 7% in ownership of the startup, and the other $375K is invested on something called an uncapped MFN safe. YC explains what that means and more terms of the deal in a detailed article on their website

Mark Zuckerberg credits some of Facebook's success to constant evolution

Before becoming the head of OpenAI, Sam Altman was the president of Y Combinator—a startup accelerator company that supported companies like Airbnb, DoorDash, and Coinbase. In 2016, Altman interviewed Zuckerberg about creating Facebook and its growth over time. Zuckerberg said that, unlike other companies (think: CourseMatch), Facebook kept growing and adding new features, which prevented the app from becoming obsolete.

Silicon Valley’s reign over tech, money, and politics

Tesla and X CEO Elon Musk, OpenAI CEO Sam Altman, LinkedIn founder Reid Hoffman, and others are getting into politics. From Musk’s role in President Trump’s second term to Hoffman’s spending on former Vice President Harris’ presidential campaign, more tech CEOs are expanding into politics. This podcast episode by WBUR and American Public Media discusses what the impact could be with so many tech figures engaging in American politics. Listen here.

87% of the startups in Y Combinator’s Fall 2025 batch were AI companies

Y Combinator also recently increased its number of cohorts or “batches” per year from two to four. Its leaders cited artificial intelligence’s rise as a reason for the increase.

Watch the DoorDash team's YC application video

In 2013, the cofounders of DoorDash created a simple, homemade video application to Y Combinator. They didn't know it at the time, but they'd be accepted—and their company would go on to be publicly traded on the NASDAQ.

Read a list of people Elon Musk has been romantically involved with, including musician Grimes

Elon Musk shares six children with his ex-wife Justine Musk, who he was married to from 2000 to 2008. He has also dated celebrities, including actresses Amber Heard and Talulah Riley.

‘Demo days’ are when founders at Y Combinator pitch their startup ideas

Investors sit in the audience, waiting to hear what this season’s batch of YC founders have cooked up. YC argues that going through the process of a demo day can help founders get a better understanding of their startup themselves.

Bumble's origin story includes a Russian billionaire, a Tinder cofounder, and a private jet.

Listen to a conversation between two Palantir cofounders—Peter Thiel and Joe Lonsdale

Palantir cofounder Joe Lonsdale was an editor of the Stanford Review (which Peter Thiel founded), and Thiel became a mentor to Lonsdale. The two discussed shared sentiments about the importance of developing Palantir to maintain a largely American global order, as well as cultural revolutions.

Listen to the last-known interview with Martha Graham

Reporter Michael Small interviewed the influential choreographer and dancer in 1989 for People magazine, two years before she died, and features the 95-year-old looking back on her life and career. If you want to skip ahead to the raw audio, jump to 26:40.

Watch a rare early interview with Palantir CEO Alex Karp

Prior to Palantir's public listing in 2020, CEO Alex Karp did not give many interviews. In a rare interview from 2009, Karp discussed the dominance of American technology, his academic background, and the founding idea of Silicon Valley entrepreneurs as key players in aiding the fight against terrorism.

See the small apartment WeWork founder Adam Neumann lived in before he was a billionaire

WeWork CEO Adam Neumann used to share a relatively small apartment in New York City with his wife before he became a billionaire off of WeWork. At one point, the apartment rented for $3K per month.

Peter Thiel and Elon Musk formed PayPal after merging two dot-com companies

Elon Musk cofounded "X.com," an online banking service, in 1999 with the idea that the web would become a financial repository as internet access expanded and became ingrained in daily life. Peter Thiel cofounded "Confinity" as a digital security service that morphed into a payments system. In 2000, the two merged to form PayPal, and in 2002, they sold PayPal to eBay for $1.5B.

3 out of Palantir's 5 cofounders once served as editor-in-chief of The Stanford Review

After Peter Thiel founded the conservative student newspaper, he remained involved and invested in the paper's success. Other Palantir cofounders, Joe Lonsdale and Stephen Cohen, also both previously served as the paper's editor-in-chief.

Many startup founders pull out-of-the-box stunts to get their businesses off the ground.

How the Martha Graham Dance Company experiments with technology

The dance company was the first major group to livestream rehearsals and has collaborated with Google on a version of Graham's "Lamentation" that superimposes past performances on the present-day dancer.

Peek into the love lives of thousands of strangers whom Stanford University researchers have been tracking since 2017 on this interactive page.

Hear from a couple about how they live their lives with MS—and how they met

This short narrative video describes the ups and downs of a woman's experience with progressive MS, and her husband's experience supporting her while navigating his own relapsing-remitting MS.

In the beginning, there was Adam (Neumann)

This podcast episode, which includes a telling interview with one of WeWork's first employees, tells the origin story of WeWork—from Neumann's drinking and disheveled clothing, to WeWork's first "summer camp" company party weekends in New York.

Watch Helen Keller visit Martha Graham's studio

The two women were friends, and Keller eventually visited Graham's studio while her company was rehearsing. In this footage of that encounter, Graham shows Keller the shape of her choreography.

See an analysis of the similarities between the characters in 'Silicon Valley' and the real people who inspired them

The HBO show "Silicon Valley" follows the story of an engineer who is trying to get his startup to take off in Silicon Valley. While one tech CEO said the show is like a documentary, many speculate the show is based on real life tech figures like Mark Zuckerberg and Peter Thiel.

A visual biography of Martha Graham

This history of the modern dancer's life uses archival photos and videos to illustrate how Graham's childhood, especially her upbringing by a psychiatrist and her early dance performance, set the stage for her career.

Stand-up Marc Maron invented the modern comedy podcast

In 2009, Marc Maron created his podcast “WTF,” featuring the stand-up holding long, candid conversations with an eclectic selection of guests. That template now defines modern podcasting, including some of the medium’s most popular shows.

Jean Carroll was one of the first women to make a name in stand-up comedy

Carroll cut her teeth in vaudeville alongside Buddy Howe, her husband, who later became her manager. Despite operating in a male-dominated field, she became a popular headliner and was a mainstay as a stand-up on "The Ed Sullivan Show," which led to her own sitcom.

Marc Maron helped define the modern podcast with 'WTF'

In 2009, Marc Maron began the "WTF" podcast, hosting a wide range of interesting celebrities in his garage studio. The extended format and unscripted conversations helped define the modern podcast.

How to make a billion dollars, with Brad Jacobs

Brad Jacobs is a serial entrepreneur who has launched eight billion-dollar enterprises during his storied financial career. With companies focused in energy, waste, and more, Jacobs has stuck to a roll-up playbook of consolidating small players into one conglomerate within an industry, a common tactic of similar private equity firms. This podcast from Founders summarizes Jacobs' book detailing his approach.

Should married couples combine finances?

Millennials who live together are more likely to keep their finances separate than any previous generation. After all, as people get married later in life and enter marriage with more assets and financial independence, some argue that the traditional route is risky. But others point to research that suggests couples who combine their finances are still happier than those who don't. To learn more, watch this video.