According to a Tuesday filing with the Securities and Exchange Commission (SEC), SpaceX's latest funding round was a smashing success. .

In March, SpaceX filings indicated it had raised $221.2 million in funding from 11 investors, in response to a $250 million offering.  .

Collectively, according to the filing, 16 investors have put in $346.2 million in the latest round of funding. .

The current round of funding represents just a drop in the bucket compared to what SpaceX plans to spend over the next several years

If you own shares of Alphabet (NASDAQ:GOOG)(NASDAQ:GOOGL), you may already own a bit of SpaceX: Google's parent company acquired a $900 million stake in SpaceX back in 2015, and there's no evidence it has sold it since.