Where are the first batch of YC founders now?

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.

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.

Y Combinator tends to outperform many other Silicon Valley startup accelerators

In a podcast episode, Garry Tan—CEO of startup accelerator Y Combinator—speaks about how YC has a better track record than the rest of Silicon Valley at placing bets on startups. Learn how Tan earned his first million dollars, as well as lessons from other successful businesspeople, including Y Combinator’s Paul Graham.

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.

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.

Sam Altman gave his first-ever startup pitch after dropping out of Stanford

He dropped out of Stanford to start Loopt, which sold in 2012 for $43.4M. You can watch his first-ever startup pitch in a video.

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.

OpenAI helped kick-start an AI arms race in Silicon Valley

Led by CEO Sam Altman, OpenAI's mission is to "ensure artificial general intelligence benefits all of humanity" by making its products open to all users. In 2023, the $86B company behind the chatbot ChatGPT consisted of a for-profit arm under its nonprofit governing board.

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.

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.

Three AI startup founders broke the record for the youngest self-made billionaire previously set by Mark Zuckerberg

Mark Zuckerberg became the youngest self-made billionaire in 2006 at 23 years old when Facebook held its initial public offering. In January of 2026, three AI startup founders—Brendan Foody, Adarsh Hiremath, and Surya Midha—broke Zuckerberg's record and became billionaires at 22 years old.

Sam Altman's life advice

Years ago, before Sam Altman became the CEO of leading AI company OpenAI, he wrote a blog post in honor of his 30th birthday. Specifically, Altman shared some of the life advice he learned in his 20s, including guidance such as, "don't lose touch with old friends. Occasionally stay up until the sun rises talking to people. Have parties." Read the rest here.

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.

7 angel investors funded Google in its early days

Entrepreneur Shaan Puri shares how seven strangers acted as Google’s earliest angel investors. The first gave Google $100K without even putting his equity agreement in writing. The investors on “Shark Tank” use their personal funds to support startups, but they’re often more predatory about terms than typical angels.

The American Research and Development Corporation is considered the first modern VC firm

Best known for investing in companies that wanted to utilize some of the technology developed during World War II, the ARDC’s cofounders all held prestigious positions at places like MIT and the Federal Reserve Bank of Boston.

Uber's first investors included StumbleUpon founder Garrett Camp

In 2010 when Uber went out to raise money, prominent investors including Mark Cuban and Gary Vaynerchuk passed. Vaynerchuk actually said no twice.

Many original dot-com company founders were bought out early on

The people who bought the original domains for dot-com companies and had the ideas to start businesses were often bought out by investors before becoming well-known companies. Both Pets.com and Broadcast.com were acquired early on.

Sahin Boydas was 2024’s most active angel investor

Others who were among 2024’s top angel investors in terms of their number of angel investments in unique companies included Google’s Jeff Dean, Solana’s Anatoly Yakovenko, and more.

Blue Origin, Jeff Bezos’ aerospace company, sent its first passengers to space in 2021

Founded in 2000, Bezos spent many years working on the company as a side project before it became more well-known around 2004, when a plot of land in Texas was purchased as a launch site for the company’s rockets. He has said that the goal of Blue Origin is to build “reusable space vehicles.” This resource details what passengers experience from takeoff to landing on a Blue Origin flight.

Prediction market Polymarket's CEO dropped out of New York University

Polymarket CEO Shayne Coplan started building Polymarket when he was 21. Polymarket has been backed by billionaire investors such as Peter Thiel and Vitalik Buterin.

The history of Reddit, the front page of the internet

The hyperactive online forum and social media platform has transformed since 2006 from a simple link-sharing site to a behemoth in digital media. Topping off its ascendancy, Reddit went public on the New York Stock Exchange in 2024, solidifying its future amid a shifting technological climate. Dive into Reddit's nearly two decades of growth with this detailed timeline.

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.

Elon Musk's first company was an online business directory called 'Zip2'

Musk started the online alternative to Yellow Pages in 1995 with his younger brother. Musk sold the company for $305M in 1999.

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.

Tencent—one of China's earliest tech giants

While not as well-known as Temu or Shein, Tencent began as an early internet messaging platform. Over three decades, it expanded to digital payments, video games, and more, becoming the first-ever Chinese company to surpass $500B in value.

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

Venture capital is a form of funding provided to early-stage companies with high growth potential, typically in exchange for an equity (or ownership) stake

A vending machine run with Anthropic's AI went out of business after it was convinced to give away items for free and sell a video game console.

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

English mathematician Ada Lovelace wrote the first computer algorithm a century before computers existed and hypothesized that computing devices would one day be able to compose music—foreseeing the generative AI systems of today.

This site reaches millions of visitors who are tired of AI chatbots and seeking human connection. Pretend to be an AI chatbot and ask questions, provide answers, and draw for people in real time.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

A Yale student wrote a profound essay about the consulting industry's influence on elite college students that was published in a book of her writing after she died in a post-graduation car accident.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

Crows are believed to have intelligence on par with a seven-year-old child and demonstrate complex behaviors, from problem-solving with tools to recognizing human faces.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

Artificial coral reefs have been 3D printed from nontoxic, biodegradable terracotta clay, which coral polyps have used as a foundation for rebuilding marine ecosystems.

Watch a 1934 short film starring jazz legend Cab Calloway, a major figure in the Harlem Renaissance's music scene

Comedy legend Catherine O'Hara, star of 'Schitt's Creek' and 'Home Alone,' quit 'Saturday Night Live' after just one week to return to her old job.

Meet the 56 signers of the Declaration of Independence—most of whom didn't put pen to paper until August 2, 1776—and see their original signatures.

Famed poet TS Eliot rejected the manuscript for George Orwell's political fable 'Animal Farm,' writing that its criticism of authoritarianism was not 'the right point of view.'