Virgin Orbit's LauncherOne has a team of 575 employees and the rocket needed 700 million USD investment.
Falcon 1 is very similar in size and it required 90 million USD investments.
Electron rocket is a bit smaller rocket and it required 100 million USD investments. The company had 200 employees when launching the first time but 500 after just 2 years.
But how many employees SpaceX had when Falcon 1 made the first successfull flight?