Stocks making the biggest moves midday: Five Below, Broadcom, Blackstone, UnitedHealth & more

Here are the companies making headlines in midday trading. Alnylam Pharmaceuticals – Shares advanced 4% after Alnylam announced a strategic artificial intelligence collaboration with Inceptive Nucleics, valued at up to $2 billion. In the partnership Alnylam plans to use Inceptive's generative AI models to aid its discovery of RNA interference therapeutics. Blackstone – The asset manager jumped 8% as investors seemed to shake off news that the firm is limiting withdrawals from the Blackstone Private Credit fund after a pickup in investor redemption requests. The stock is now on track to snap a three-day string of losses. Fellow asset managers Ares Management and KKR each saw shares gain 6% in sympathy. Humana – Shares of the health insurer rose more than 6%. Morgan Stanley raised its price target on Humana to $249 per share, suggesting roughly 24% downside from Wednesday's close. Still, that compares to an anticipated decline of nearly 34% based on the earlier price target of $217 a share. Morgan Stanley stuck with its underweight rating on shares. Broadcom — Shares tumbled nearly 15% after the chipmaker reported fiscal second-quarter revenue of $22.19 billion, short of the $22.27 billion expected from analysts polled by LSEG. Broadcom CEO Hock Tan reiterated the company's fiscal year 2027 revenue guidance for AI chips to be "in excess of $100 billion." Semiconductor stocks — Shares of artificial-intelligence semiconductor companies slid following Broadcom's results. …