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Overview: Space IPOs are rearing their heads again

It's a brave person who calls a market closed or open, particularly for listings — you'll forgive me if I'm not the one to make that plunge. But the gentle trickle of space IPOs since the start of the year, after a dearth of listings in recent years, isn't going unnoticed.

Trive Capital-backed Karman Holdings, maker of defense and space systems, went public back in February with a valuation of nearly $4 billion as shares soared during their debut. Voyager Technologies clinched a $3.8 billion valuation two months ago, as the defense and space company's s

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