Alex Karp, CEO of Palantir, arrives for the “AI Insight Forum” at the Russell Senate Office Building on Capitol Hill on September 13, 2023 in Washington, DC.Alex Wong | Getty ImagesPalantir shares fell around 7% in extended trading on Monday after the defense tech firm reported weaker-than-expected guidance.Here's how the company did compared to LSEG estimates:Earnings per share: 8 cents adjusted vs. 8 cents expectedRevenues: $634 million vs. $625 million expectedThe firm, which builds big-data ...