CoreWeave, Talen Energy, and NextNav lead Wednesday's biggest stock movers

CoreWeave shares surged 20% Wednesday after the neocloud company beat quarterly earnings estimates and raised its full-year guidance, citing overwhelming demand for its infrastructure. CEO Michael Intrator told CNBC that the company is 10 times oversubscribed for its remaining 2027 capacity and multiple times oversubscribed for 2028. Separately, Talen Energy rose nearly 5% in premarket trading after announcing a seven-year agreement to sell 750 megawatts of capacity, expected to generate about $100 million annually through 2036. NextNav climbed 9% after third-quarter revenue nearly doubled year over year and its loss narrowed to 4 cents per share. The GPS backup firm, based in Reston, Virginia, holds $264.1 million in cash and short-term investments, though its stock remains down 50% in 2026 with a market value of about $1.5 billion.