Check out the companies making headlines in after-hours trading. Snap — The social media company surged 26% after it unveiled a $500 million buyback program and issued strong fourth-quarter revenue guidance. On top of that, Snap said Perplexity AI will pay it $400 million to integrate the AI startup's search capabilities into Snapchat. Arm Holdings — Chip designer Arm Holdings' stock rose nearly 3% after beating expectations on the top and bottom lines. Arm earned 39 cents per share, excluding items, on revenue of $1.14 billion. Analysts surveyed by LSEG had expected Arm to earn 33 cents per share on revenue of $1.06 billion. The company's third-quarter forecast also outpaced estimates. Figma — AI software company Figma saw its shares rise nearly 6% after it beat third-quarter revenue esti

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