BREAKING: SpaceX is set to join the Russell 1000, one of the largest U.S. stock market indices, after market close today.

• Index-tracking funds may need to buy nearly $3B in SpaceX shares

• The Russell 1000 tracks the 1,000 largest publicly traded U.S. companies.

• Many ETFs and index funds automatically buy stocks added to the index.

Another major milestone as SpaceX.