Y Combinator

Y Combinator is an American seed money startup. The accelerator invested into 2,000 companies.
It is based in Mountain View, California.
Overview.
Y Combinator has been founded in March 2005 by Paul Graham and other investors. The main task is to help different companies develop and find investors. 
The program consists of weekly dinners, where guests (experts in various industries) are invited to talk to the founders of companies. They can give advice or invest into the startup in exchange for 7% of the company's shares.
As of 2019, Y Combinator has invested more than 2,000 companies, including Dropbox, Airbnb, Coinbase, Stripe, Reddit, Instacart, Twitch etc.
In 2020, Geoff Ralston became the company's President.