Palantir (PLTR) shares surged during the week of September 21, 2026, closing at $183.09 on the 21st before advancing to $192.59 by the 24th amid sustained post-earnings momentum from its Q2 results. The company delivered revenue of roughly $1.94 billion, well above consensus, with U.S. commercial revenue expanding 149% year-over-year and full-year guidance materially raised. Fresh catalysts included a $48.1 million U.S. Army ammunition-management contract, European expansion discussions led by CEO Alex Karp, and analyst price-target increases to $225. These developments reinforced trader focus on Palantir’s positioning in AI-driven data analytics and defense software, with the next earnings release scheduled for early November. Market-implied odds for week-end levels reflect this rapid price appreciation and elevated trading volumes.