Tesla, Microsoft among market cap stock movers on Thursday

The article is a market-movers roundup for Thursday highlighting notable market-cap winners and losers. Mega-caps Tesla (TSLA) and Microsoft (MSFT) were among the gainers, while chip-related names such as Arm and Lam Research fell. Several large- and mid-cap names posted outsized moves on company news: Datadog and Fortinet surged on FedRAMP certification and strong Q1/raised guidance respectively, while Zoetis and Planet Fitness plunged after weak guidance/downgrades. The piece catalogs movers across mega-, large-, mid- and small-cap buckets, noting drivers such as earnings, guidance changes, analyst actions and corporate news that are moving individual stocks and helping shape intraday market breadth.