Palantir shares tumbled Tuesday afternoon, extending recent losses as a high-profile short seller fueled worries the stock could be overvalued after a strong run earlier this year.

However, since hitting a record closing high of $186.97 on August 12, the stock on Tuesday was on track for a five-day losing streak and its worst day since May 6. As of 1500 ET, PLTR's class A shares ...

Then, short seller Andrew Left of Citron Research said PLTR stock was "detached from fundamentals and analysis". He's ...

Palantir stock fell for the fifth straight trading session on Tuesday. With the retreat, Palantir stock is down 12% from its all-time high.