Here are the companies making notable moves in midday trading:

Dominion Energy — Shares fell nearly 5% after the Trump administration halted five East Coast offshore wind projects, including Dominion’s Coastal Virginia Offshore Wind—the largest such project in the U.S. The decision deals a major blow to the clean energy transition and casts uncertainty over the sector’s regulatory landscape.

Maplebear (Instacart) — The grocery delivery platform’s stock declined more than 3% after announcing it will end AI-driven pricing tests that resulted in some customers paying more than others for identical items in the same store. The move reflects growing scrutiny over algorithmic pricing fairness.

Warner Bros. Discovery — Shares rose 3% after Paramount Skydance guaranteed Larry Ellison’s backing for an amended offer for the media giant, which had already accepted a separate bid from Netflix. Paramount shares jumped 5%, while Netflix dipped slightly.

Rocket Lab — The aerospace stock surged 10% on an $816 million contract to build a missile-defense satellite system for the U.S. Space Force, highlighting its growing role in national security space initiatives.

UniFirst — The workwear company’s shares soared about 18% after Cintas submitted a cash offer of $275 per share, valuing UniFirst at approximately $5.2 billion—a 64% premium to its recent average price. Cintas shares gained 3%.

Tesla — The EV maker advanced nearly 3% after the Delaware Supreme Court overturned a lower court’s decision to void Elon Musk’s $56 billion pay package. Tesla has risen almost 15% in December, outperforming other megacap tech stocks.

First Solar — Shares spiked nearly 6% following Alphabet’s announcement that it will acquire solar developer Intersect for $4.75 billion. First Solar is a key module supplier to Intersect, positioning it to benefit from the deal.

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

Honeywell — The industrial conglomerate fell over 1% after disclosing a one-time charge tied to settlement talks with Flexjet, which will reduce GAAP sales by $310 million and operating income by $370 million in the fourth quarter.