Datadog Inc. rallied sharply after traders said the cloud-monitoring company will be added to the S&P 500, a move that typically forces index-tracking funds to buy the stock. The shares, which jumped in late trading on 2 July, extended gains to about $160 during the 3 July session as momentum investors piled in. The prospective inclusion caps a strong run for the New York–based software provider, which has benefited from rising demand for observability tools across artificial-intelligence and cloud projects. Market participants said placement in the benchmark index could broaden the company’s shareholder base and improve liquidity. Separately, Robinhood Markets Inc. crossed the $100 mark for the first time on 2 July, extending a rally that has lifted the online brokerage’s stock roughly 150% in 2025 and made it a ten-bagger since 2022. The shares pulled back a day later amid selling pressure after the firm was left out of the latest S&P reshuffle, but traders remained focused on potential re-entry levels around $90.