Elon Musk's SpaceX defies typical market buckets, and the IPO will give Wall Street another chance to value "strategic tech" like Palantir.

When SpaceX makes its debut on the U.S. stock market, it wants smaller-pocketed, mom-and-pop investors to play a big role in what may be the biggest IPO ever.

Elon Musk’s SpaceX is heading for what could become the biggest IPO in history. The rocket and satellite giant is targeting a record $75 billion raise at a valuation of nearly…