The Tema Space Innovators ETF has crossed $1.5 billion in assets under management in less than two months, turning it into the largest space ETF on the market and one of the fastest-rising funds in the category. Tema did it as the sixth fund to enter the space race, and it did it by offering something rivals did not: SpaceX shares.
That is why the fund is showing up in stock market news today. SpaceX’s planned IPO next month is at the center of a rush into space stocks, and investors are treating Tema’s fund as a rare public-market doorway into the company before it lists. The result has been a sharp reordering of a niche corner of the ETF market, where size is suddenly being driven less by satellite makers and launch companies than by the promise of private-company exposure.
The scale of the move stands out even more when set against the rest of the category. The Procure Space ETF has reached $1.1 billion in assets, up from just $33 million at the end of 2024 and around $100 million as recently as December 2025. The ARK Space & Defense Innovation ETF has crossed $1 billion in assets again for the first time since January. State Street’s SPDR S&P Kensho Final Frontiers ETF has reached $237 million, the Roundhill Space & Technology ETF, launched in early March, has climbed to $76 million, the Global X Space Tech ETF has reached $34 million, and the VanEck Space ETF has grown to $17 million.
The space ETF field now includes both actively managed and index-tracking funds. NASA, ARKX and MARS are actively managed, while UFO, ROKT, ORBX and WARP follow indexes. The newer funds NASA, MARS, WARP and ORBX hold variations of relatively pure-play space portfolios, but the category is not as clean as the marketing can suggest. ARKX’s top holding is Rocket Lab, yet its top 10 also include Deere & Co., AMD and Amazon.com. ROKT has a stated mandate covering both deep space and deep sea, with top positions in Planet Labs, Intuitive Machines and Rocket Lab.
That mix matters because it shows how broad the space theme has become just as investors are chasing a more focused story. SpaceX’s IPO next month is the next clear event, and it is likely to keep money flowing toward the funds that can offer the closest thing to a pre-IPO space bet. What happens after that listing will determine whether this is a temporary surge or the moment space investing became a lasting ETF business.
