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The long IPO winter is finally thawing. And right now, there’s one question on every investor’s tongue as a new wave of trillion-dollar tech IPOs hits the public markets.

Is this the next blockbuster IPO – or a pure meme stock?

Two weeks ago, Elon Musk had investors frantically debating the answer to that question when his aerospace juggernaut, SpaceX, finally IPO’d 24 years after its founding.

You probably know the headlines already — SpaceX commanding a staggering $2 trillion valuation at IPO, the largest IPO in history. The stock opening north of $160 and then peaking at $225 — or more than 67% above its IPO price.