If you've been trying to get a piece of SpaceX before it goes public, you're not alone. And the Tema Space Innovators ETF (NASA) is proving just how hungry investors are. The fund crossed $1 billion in assets under management just 37 trading days after its launch, and it's now sitting at roughly $1.27 billion. That makes it the largest space-focused ETF in the U.S., according to the issuer.

Launched on March 31 with just $1 million in seed capital, NASA has become the second-fastest thematic ETF to hit the $1 billion milestone, and it ranks among the five fastest active equity ETFs to reach that mark out of more than 1,700 products. Not bad for a fund that's barely two months old.

The rapid growth comes as the commercial space industry is generating serious buzz. Satellite launches are ramping up, defense spending is flowing into space technologies, reusable rockets are becoming routine, and the long-awaited SpaceX IPO is finally on the horizon. Since SpaceX remains privately held and largely inaccessible to most retail investors, funds like NASA offer a backdoor into Elon Musk's rocket and satellite empire.

NASA isn't your grandfather's aerospace fund. It's actively managed and focuses on companies tied to the modern space economy—launch systems, satellite infrastructure, communications networks, and space-enabled technologies. That direct exposure to SpaceX has become a major selling point for investors who want access to one of the world's most valuable private companies without waiting for the IPO.

The ETF competes with older products like the ARK Space & Defense Innovation ETF (ARKX) and the Procure Space ETF (UFO), but many of those funds are still heavily weighted toward traditional aerospace and defense contractors rather than pure-play commercial space operators. NASA's focus on the new space economy gives it a different flavor.

The milestone also reflects a broader trend in 2026: thematic and actively managed ETFs are making a comeback. Investors are chasing high-growth trends tied to artificial intelligence, defense technology, and frontier innovation. The space trade, it seems, is finally moving from hype to something you'd actually put in your portfolio.