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Shares of Generac Holdings jumped more than 30%, and by some measures over 40%, after the company disclosed a major agreement to supply backup power generators to Amazon for its data centers. The deal's first deliveries alone are valued at $2.4 billion, cementing Generac's positioning as a beneficiary of the AI-driven data center buildout. As part of the arrangement, Amazon obtained warrants to purchase up to $340 million worth of Generac stock, aligning the retail and cloud giant's incentives with the power equipment maker's growth. The transaction underscores how AI infrastructure demand is spilling over into adjacent industries such as backup power generation.