Stocks making the biggest moves midday: Five Below, Broadcom, Blackstone, UnitedHealth & more Several companies made significant stock market moves today, with Alnylam Pharmaceuticals advancing on an AI collaboration and Blackstone rising despite fund withdrawal limits. Conversely, Broadcom shares tumbled after missing revenue expectations, impacting other AI semiconductor stocks, while Five Below and Petco saw declines despite varying outlooks.

• Alnylam Pharmaceuticals shares rose 4% on a $2 billion AI collaboration with Inceptive Nucleics.
• Blackstone stock jumped 8% despite news of withdrawal limits on its Private Credit fund.
• Broadcom shares fell nearly 15% after reporting fiscal second-quarter revenue below expectations.
• AI semiconductor stocks, including Micron, Intel, AMD, and Arm Holdings, slid following Broadcom’s results.
• Five Below shares dropped 13% despite providing a better-than-expected outlook.
• Petco shares declined roughly 8% as its current-quarter forecast fell short of expectations.
• CrowdStrike lost 6% on lackluster second-quarter guidance, with Palo Alto Networks trading lower in sympathy.
• PVH shares plunged 20% after reiterating full-year earnings guidance despite a first-quarter earnings beat.
• UnitedHealth shares climbed 5% following an upgrade to buy from Bank of America.
• Medtronic advanced 4% after BTIG upgraded shares to buy from neutral.