Elon Musk's rocket company, SpaceX, could be closing in on Airbnb as the second most valuable private company in the US.
A newly amended public filing in Delaware shows the rocket company is set to launch a new $507 million dollar round of financing, selling 3 million shares at $169 a share.
CNET obtained the document from Lagniappe Labs, creator of the Prime Unicorn Index (PUI), which estimates SpaceX would be valued at $23.7 billion.
That valuation would be up from PUI's current estimate of $18 billion.
SpaceX confirmed the funding round but declined to comment further.
The quick jump in SpaceX's value puts it near Airbnb's estimated valuation, which PUI places at around $29 billion. Uber tops the list of most valuable American private companies at $44 billion. Coming up not far behind SpaceX are other Silicon Valley darlings, including Dropbox, Lyft and Pinterest.
SpaceX's reputation has grown in recent months with the successful, plans to launch a and, of course, an .
Meanwhile, SpaceX continues to rake in revenue by working with telecommunications companies, the US military and NASA to launch satellites and spacecraft, among other missions. It also.
A big part of the company's plan for profits involves reducing costs by recycling its rockets.
SpaceX's business model will likely make a big leap forward when the final version of the Falcon 9 rocket is launched for the first time later this month. Also known as the "Block 5" Falcon 9, the rocket could be capable of making. Previous versions of the Falcon 9 have flown no more than two missions.