However, the percentage of shares available for public trading -- known as the float -- is roughly 5% of SpaceX's market cap. As of June 30, the data shows that multiple Vanguard ETFs bought SpaceX in June, including the Vanguard Total Stock Market ETF (NYSEMKT: VTI), the Vanguard Growth ETF (NYSEMKT: VUG), the Vanguard Mega Cap Growth ETF (NYSEMKT: MGK), and the Vanguard Communication Services ETF (NYSEMKT: VOX). But only one Vanguard ETF has a higher weighting in SpaceX than the Nasdaq-100. That's significantly higher than the less than 0.5% weighting in the three Vanguard ETFs mentioned earlier. Investors can expect SpaceX's weighting in the communications sector to grow as more shares are unlocked and traded on the Nasdaq.