Close Key Takeaways Datadog shares have added about a third of their value in 2025. Jaque Silva / NurPhoto / Getty Images Datadog (DDOG) shares soared Thursday after the cloud-based monitoring and security platform posted quarterly results that topped analysts' estimates and raised its outlook. The stock was up over 20% in recent trading, making it the best-performing stock in the S&P 500 Thursday afternoon. The company posted adjusted earnings per share of $0.55 for the third quarter, above analysts' estim ...