Nio, AppLovin, SK Hynix lead midday market swings

These are the stocks making the biggest moves midday, as reported by market data. Nio shares rose sharply after the electric vehicle maker announced stronger-than-expected delivery numbers. AppLovin surged following a bullish analyst upgrade on its advertising technology. SK Hynix gained on continued demand for high-bandwidth memory chips used in AI. Meanwhile, Braiin, a neurotechnology firm, saw its stock drop after reporting a wider quarterly loss. SpaceX, which is not publicly traded, saw its private valuation increase after a new funding round.