US Space and Defense Stocks Today: Midday Market Movers, Taiwan Arms Package, Rocket Lab’s Space Force Launch, and the White House NDAA Timeline (Dec. 18, 2025)
U.S. aerospace and defense ETFs outperformed the broader market at midday Thursday, with ITA up 2.14%, XAR up 2.27%, and PPA up 1.47%. The S&P 500 ETF rose 1.35%. Investors weighed softer inflation data against White House discussions of possible limits on buybacks, dividends, and executive pay for contractors with delayed or over-budget projects. Major defense primes traded mixed.