Palantir (PLTR 19.81%) stock is seeing massive gains in Wednesday's trading. The software specialist's share price was up 18.2% as of 3:20 p.m. ET, amid an 8.5% gain for the S&P 500 and a 9.9% rally for the Nasdaq Composite.Palantir stock is surging today after President Donald Trump announced a 90-day pause on reciprocal tariffs for all countries except China. Despite volatility in the broader market, Palantir's share price is now up 21.5% across 2025's trading.Palantir stock surges following Trump's tarif ...