Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:

- Generac (GNRC) shares are jumping after the company and Amazon execute a long-term supply agreement, with initial deliveries of backup generators expected to total $2.4b in 2027, 2028.

- CoreWeave (CRWV) is the most actively traded stock in the premarket as it kicked off a fresh round of fundraising that includes a $3 billion convertible bond issue and a vehicle for potential share sales.

- Lockheed Martin (LMT) shares are moving on news the Pentagon and Lockheed Martin have struck a framework agreement for a multi-year production contract for the Joint Advanced Tactical Missile, or JATM.