How Palantir Stock Soared 80% in the First Half of 2025 to Become the Best S&P 500 Stock -- and Why the Next Big Move Could Come

  • Palantir Technologies (PLTR 1.62%) stock soared 80.3% in the first half of 2025, which ended on Monday, June 30. That performance made the operator of artificial intelligence (AI)-powered data analytics platforms the best performer in the S&P 500 index.