On May 21, 2010, Tesla announced a "strategic partnership" with Toyota, which agreed to purchase US$50 million in Tesla common stock issued in a private plac…
On May 21, 2010, Tesla announced a "strategic partnership" with Toyota, which agreed to purchase US$50 million in Tesla common stock issued in a private placement to close immediately after the IPO.
Event text from Wikipedia: “History of Tesla, Inc.” (linked citation above)