Key TakeawaysTema Space Innovators ETF (NASA) crossed the $1 billion assets under management threshold within 37 trading days of its March 31 launch.With $1.27 billion in AUM, NASA has become the space sector’s largest ETF, surpassing both UFO and ARKX.NASA stands alone as the only space-focused ETF offering investors access to SpaceX shares.A massive $375 million single-day influx occurred Wednesday, driven by enthusiasm surrounding SpaceX’s upcoming IPO.Paradoxically, while investors flock to the fund for SpaceX exposure, the company’s portfolio weight has dropped from 10.3% to just 4.6% due to dilution from incoming capital.The Tema Space Innovators ETF, which trades under the ticker symbol NASA, achieved the $1 billion assets under management benchmark in merely 37 trading sessions. This achievement positions it as the second-fastest growing thematic ETF and places it among the top five fastest-growing active equity ETFs to reach this milestone among over 1,700 similar investment vehicles.Tema Space Innovators ETF, NASALaunching on March 31 with just $1 million in initial seed funding, the fund has since expanded to $1.27 billion in total assets.Since its debut, the ETF has delivered a 46% return, significantly outperforming competitors UFO (up 32%) and ARKX (up 17%) during the identical timeframe. The only space-sector fund posting stronger results is the Roundhill Space & Technology ETF (MARS), which gained 53% over this period.The primary attraction for NASA is straightforward: it remains the sole space ETF providing access to SpaceX.Following SpaceX’s S-1 filing on Wednesday in preparation for next month’s anticipated public offering, investor interest surged dramatically. The fund attracted $375 million in assets in just one trading session.SpaceX Public Offering Anticipation Drives Capital InflowsThe impending SpaceX public offering has emerged as among the most eagerly awaited market debuts in recent memory. For those seeking early exposure before shares begin trading publicly, NASA has represented the sole ETF pathway.This unique positioning has propelled NASA ahead of more established competitors. UFO, despite its longer market presence, currently manages $972 million in assets. ARKX holds $944 million. While both funds have experienced solid inflows—$456 million and $143 million respectively in 2024—neither approaches NASA’s extraordinary growth trajectory.The fund secures its SpaceX position through a Special Purpose Vehicle (SPV) structure. While this arrangement enables the private company exposure, it introduces significant limitations.The Paradox of Rapid Growth and Declining ExposureHere lies the contradiction: as more capital flows into NASA specifically for SpaceX access, individual investors’ proportional SpaceX exposure diminishes.When substantial inflows enter an ETF, portfolio managers must rapidly deploy that capital. Unlike publicly traded securities, private holdings like SpaceX cannot simply be purchased through open market transactions. Consequently, incoming funds get allocated to publicly available stocks, systematically diluting the private company allocation.Just last week, SpaceX represented 10.3% of the portfolio. That figure has now contracted to 4.6%.Interestingly, SpaceX hasn’t been the primary performance driver—the fund’s gains have predominantly originated from its publicly traded components. Nevertheless, SpaceX’s mere presence in the portfolio has proven sufficient to establish NASA as the commanding leader within the space ETF category.Tema President Steve Munroe indicated the fund was designed to provide “institutional-quality” exposure to the space industry, including pre-IPO access to companies like SpaceX.As of Wednesday’s close, NASA had tripled its assets under management within a single week.The post Tema Space Innovators ETF (NASA) Reaches $1 Billion Milestone in Record Time appeared first on Blockonomi.