Investors poured more than $2 billion into the Tema Space Innovators ETF (NASDAQ:NASA) in May, making it one of the most popular thematic ETFs of the month and highlighting growing appetite for space-related investments.
• What’s the outlook for NASA shares?
According to FactSet data, NASA attracted $2.11 billion in net inflows during May, trailing only the Roundhill Memory ETF (BATS:DRAM) and the iShares International Country Rotation Active ETF (NASDAQ:CORO) and excludes ETFs such as Vanguard S&P 500 ETF (NYSE:VOO), iShares Core S&P 500 ETF (NYSE:IVV), State Street SPDR S&P 500 ETF Trust (NYSE:SPY) ad Invesco QQQ Trust (NASDAQ:QQQ). The fund’s assets under management climbed to roughly $2.7 billion by month-end.
The strong inflows came during a robust month for the ETF industry. U.S.-listed ETFs gathered $199.4 billion in May, lifting year-to-date inflows to $843.2 billion and total industry assets to a record $15.7 trillion.
SpaceX Buzz Creates A Halo Effect
The surge in interest may also reflect growing investor fascination with the commercial space economy, fueled in part by recurring speculation surrounding a potential SpaceX IPO.
Although Elon Musk has repeatedly indicated that SpaceX is not rushing toward a public listing, the company has continued to attract attention as its valuation climbs through secondary-market transactions.
With SpaceX remaining inaccessible to most public-market investors, space-focused ETFs have emerged as one of the few liquid vehicles for gaining exposure to the broader ecosystem supporting satellite communications, launch services, aerospace manufacturing, and space infrastructure.
While NASA does not hold SpaceX shares directly (it takes the SPV route to investing in SpaceX), investors may be betting that continued enthusiasm around the world’s most valuable private space company could lift publicly traded firms across the sector.
The resulting “SpaceX halo effect” appears to be helping channel fresh capital into space-themed ETFs.
Investors Shift Toward Strategic Technology Themes
NASA’s rise up the ETF flow rankings also reflects a broader trend: investors are increasingly targeting funds linked to strategic technologies and critical infrastructure rather than broad market exposure.
The overlap between commercial space and national security has become particularly important. Space-based assets now play a central role in communications, navigation, intelligence gathering, missile detection and defense operations, making the sector an increasingly attractive long-term investment theme.
AI, Space and Infrastructure Dominate ETF Flows
Several of May’s biggest ETF winners were tied to transformative technology and infrastructure themes.
Top ETF Inflows In May
–Roundhill Memory ETF (DRAM): $7.95 billion
–iShares International Country Rotation Active ETF (CORO): $3.06 billion
–Tema Space Innovators ETF (NASA): $2.11 billion
–iShares Expanded Tech-Software Sector ETF (BATS:IGV): $1.88 billion
–iShares Semiconductor ETF (NASDAQ:SOXX): $1.72 billion
–First Trust Nasdaq Clean Edge Smart GRID Infrastructure Index Fund (NASDAQ:GRID): $1.14 billion
The flow data suggests investors are increasingly seeking exposure to the infrastructure behind major technological shifts. Alongside space, money poured into funds tied to memory chips, semiconductors, software, and power grids—the building blocks supporting the next generation of AI, defense, and communications networks.
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