However, several popular exchange-traded funds (ETFs) will continue buying SpaceX, even if its price keeps falling, because of their float-based weighting systems. The float is the number of shares available on the open market (in this case, the Nasdaq Stock Market) for public buying and selling. SpaceX's IPO changed the gameToday's largest companies by market cap all went public at a small fraction of their current value. As of June 30, SpaceX is the 110th-largest holding in the Vanguard Total Stock Market ETF, right behind ServiceNow, even though SpaceX's market cap is over 15 times higher than ServiceNow's. On Aug. 6, 20% of early release eligible shares will be unlocked, which could drastically increase SpaceX's float if insiders sell their shares on Nasdaq.