Y Combinator

Y Combinator is a company from Silicon Valley in California that helps other companies get started. Twice a year, it selects a few hundred very young companies, often founded by two or three people with an idea and little else. These groups receive money, three months of intensive mentoring, and access to a large network of experienced founders and investors. In return, each company gives Y Combinator a small stake in itself, currently around seven percent. If the company later becomes very valuable, that stake becomes valuable too — that is the business model. Such programs are called accelerators, and Y Combinator is the best-known of them.

Why a name from California turns up in German business news

Y Combinator was founded in 2005 and has since taken in over 5,000 companies. Among them are names almost everyone knows: the housing platform Airbnb, the payment provider Stripe, the cloud storage service Dropbox, and the discussion forum Reddit. According to the company’s own figures, the combined value of all YC companies runs into the hundreds of billions of dollars. This track record has given the program a reputation that extends far beyond the startup scene.

For a young company, being accepted is therefore more than a windfall of cash. It acts like a seal of quality. Investors, who receive hundreds of pitches every day, take a closer look at a YC company. Job applicants and potential customers also take such a company more seriously, even though it may have existed for only six months.

For the AI industry, Y Combinator also serves as an early indicator. When suddenly a third of a batch is working on AI tools, that says something about where investment will flow in the coming years. That is precisely why business media report on the composition of every new batch. Critics counter that this reinforces trends and makes many companies very similar to one another.

From application form to Demo Day

The process has been similar for years. Founding teams fill out an online form and record a short video about themselves. Those who make the shortlist have an interview of about ten minutes. The decision is based less on the business idea than on the people behind it, since ideas often change completely during the program.

The accepted teams move into the batch for three months — that’s what a cohort is called. There are weekly meetings, talks by experienced founders, and fixed contacts for questions. The stated goal is simple: by the end of the program, the company should grow measurably, usually in user numbers or revenue. Weekly growth of five to seven percent is considered good pace internally.

At the end comes Demo Day. Each team presents its company in a few minutes in front of a room full of investors. Many companies raise their first major round of funding in the days that follow. Important distinction: Y Combinator is not a bank and does not offer loans. The money does not need to be paid back, but in exchange a piece of the company permanently belongs to someone else.

Where the term crops up in everyday life

Most often, one encounters Y Combinator as an addendum in news items: “the Y Combinator-backed startup X has raised 20 million dollars.” The mention functions as a quality marker there, much like a well-known university on a résumé. Batch designations such as “W25” or “S24” also appear, referring to the winter and summer batches of a given year.

Y Combinator also runs the news site Hacker News, where programmers and founders share links and discussions. It is one of the most influential forums in the tech industry. Another well-known offering is Startup School, a free online course that anyone can use without applying.

In Europe there are similar programs, such as Techstars or, in Germany, offerings from universities and state-owned banks. They work on the same principle but are smaller and less well known. A common misconception is that Y Combinator is a regular investor that puts large sums into mature companies. The opposite is true: the amounts per company are small, the risk is high, and most teams are little more than an idea at the start.