Rivian Automotive (NASDAQ: RIVN) stock is wrapping up the trading week on a high note, revving 10% higher to over $18 as of 12:30 p.m. ET -- and for a most surprising reason:

This morning, investment bank raised its price target on Rivian...to $15 a share.

Let me repeat that: Rivian stock closed at more than $16 last night. Mizuho just said it's only worth $15 (and gave the shares only a neutral rating -- not a buy). And investors responded by bidding Rivian stock up instead of down.

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Source Fool.com