Check out the companies making headlines in midday trading: Acadia Healthcare — The health-care stock popped 10% after investor David Einhorn told CNBC that he has been buying the stock. The Greenlight Capital fund manager said he’s hopeful the company’s new management will be able to improve its performance. Vertiv — The provider of data center cooling and power equipment’s stock jumped nearly 20% on the back of upbeat guidance for 2026 that was well ahead of Wall Street’s expectations. Vertiv said orders accelerated significantly in the fourth quarter. Unity Software — Shares fell nearly 30% after issuing a disappointing first-quarter revenue outlook. Unity expects revenue between $480 million and $490 million. Analysts surveyed by LSEG had anticipated revenue of $492.1 million. Smurfit WestRock — The packaging company’s stock soared more than 10% after the company disclosed that orders for its products improved in late December. The box maker said it expects to ramp up its profits $7 billion by 2030. Full year core profit is expected to be between $5 billion and $5.3 billion this year. BorgWarner — The provider of electric vehicle parts’ stock jumped about 20% to a 52-week high after saying it struck several new deals that will allow it to break into the AI data center market. The company will supply turbine generators for this market, whith production expected t …
