There's no such thing as a typical Day One for an initial public offering.

Charles Schwab, Fidelity, Robinhood, SoFi and Morgan Stanley's E-Trade are among the brokerage platforms making SpaceX shares available.

Elon Musks SpaceX is poised for a historic IPO, aiming to raise $75 billion at a $1.75 trillion valuation. Investor demand is strong, with shares set to list on Nasdaq on June…