Palantir stock is trading at a lofty valuation "which history suggests is nearly impossible to grow into," Deutsche Bank's Brad Zelnick said.

Despite impressive profitability and sales growth, PLTR's stock valuation at 53.5x leading sales is frothy, necessitating a rating change to “Sell.” Read more here.

Palantir Technologies Inc.’s hefty premium will be in focus when the data analysis software giant reports earnings after the market close on Monday — with the stock trading at levels some see as difficult to maintain.

What Happened? Shares of data-mining and analytics company Palantir (NYSE:PLTR) jumped 26.9% in the morning session after the company reported impressive fourth-quarter results, which blew past analysts' billings,