Stocks making the biggest moves midday: Dominion Energy, Paramount, Rocket Lab, Stanley Black & Decker and more

Key Points

1. Dominion Energy and Wind Projects: Dominion shares fell nearly 5% after the Trump administration paused five East Coast wind projects, including Coastal Virginia Offshore Wind.
2. Paramount vs. Netflix Moves: Warner Bros. Discovery shares rose 3% as Paramount Skydance confirmed Larry Ellison would back its amended offer, while Netflix stock dipped slightly.
3. Big Gains in Aerospace and Acquisitions: Rocket Lab surged 10% on a U.S. Space Force contract, and UniFirst jumped 18% after Cintas offered $5.2 billion to acquire the company.

Midday Stock Movers: Dominion Energy, Paramount, Rocket Lab, and More

Here’s a look at some of the companies making notable moves in midday trading:

Dominion Energy – Shares fell nearly 5% after the Trump administration paused five East Coast wind projects, including the Coastal Virginia Offshore Wind, the largest project of its kind in the U.S.

Maplebear (Instacart) – Stock dropped over 3% after the company announced it would end AI-driven pricing tests on its grocery platform. These tests had caused some customers to pay more for identical items than others in the same store.

Warner Bros. Discovery (WBD) – Shares rose 3% after Paramount Skydance confirmed that Larry Ellison would back an amended offer for the HBO parent. WBD had already accepted Netflix’s offer. Paramount shares jumped 5%, while Netflix fell slightly under 1%.

Rocket Lab – Aerospace stock surged 10% after winning an $816 million U.S. Space Force contract to build a missile-defense satellite system.

UniFirst – Shares jumped about 18% after Cintas offered to acquire the workwear company for $275 per share in cash, valuing the deal at roughly $5.2 billion—a 64% premium over UniFirst’s recent 90-day average closing price. Cintas stock rose around 3%.

Stanley Black & Decker – Shares climbed nearly 5% following the sale of its aerospace manufacturing business to Howmet Aerospace for $1.8 billion, proceeds mainly to pay down debt. Howmet’s stock rose almost 2%.

Janus Henderson – Fund manager shares increased 3% after agreeing to be acquired by Trian Fund Management and General Catalyst. The deal is expected to close in mid-2026.

Tesla – Stock rose nearly 3% after the Delaware Supreme Court overturned a lower court decision voiding Elon Musk’s pay package, which includes 300 million stock options. Tesla has gained almost 15% in December, outperforming other “Magnificent Seven” stocks.

First Solar – Shares spiked nearly 6% after Alphabet announced it would acquire Intersect for $4.75 billion in cash and debt. First Solar supplies solar modules to Intersect.

Clearwater Analytics – Shares rose 8% after agreeing to be acquired by private equity firms Permira and Warburg Pincus for $8.4 billion, including debt. The deal is expected to close in the first half of 2026.

Honeywell – Industrial giant fell over 1% after reporting a one-time charge in Q4 that will lower GAAP sales by $310 million and operating income by $370 million, related to settlement talks with Flexjet.