YouTube began as an angel-funded enterprise working from a makeshift office in a garage. In November 2005, venture firm Sequoia Capital invested an initial $3.5 million,[20] and Roelof Botha (a partner of the firm and former CFO of PayPal) joined the YouTube board of directors. In April 2006, Sequoia and Artis Capital Management invested an additional $8 million in the company, which had experienced significant growth in its first few months.

https://en.wikipedia.org/wiki/History_of_YouTube