1. Palantir Technologies' stock has surged 88.5% since August, but is now considered overvalued. 2. Despite strong revenue and profit growth, the stock's valuation is unsustainable. 3. The company's financial strength, with no debt and $4.56 billion in cash, is overshadowed by high trading multiples. 4. The analyst downgrades Palantir Technologies to 'sell' due to potential underperformance.