Rocket Lab just picked literally the best time ever to cash in some stock.

Rocket Lab ( RKLB -12.72% ) stock hit an all-time high last night, closing above $54 a share -- and you know what that means.

It's time to sell.

At least, that's what Rocket Lab seems to think. In an SEC filing last night, the maker of small Electron rockets and developer of the new Neutron medium-lift rocket announced plans to raise up to $750 million in new cash through stock sales.

Now Rocket Lab stock is tumbling, down 9.2% through 11:11 a.m. ET. And why?

Rocket Lab's big cash grab

Rocket Lab has lined up an impressive array of a half dozen big banks, from Bank of America to JMP to Needham, to help it sell shares "from time to time" and at whatever price the market will bear.

Notably, Rocket La

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