Stocks making the biggest moves premarket: Generac, Lennar, Nike & more

Generac surged 33% after securing an Amazon data-center backup-power supply agreement expected to generate $2.4B in deliveries during 2027-28, alongside an Amazon option to purchase up to $340M of Generac stock. Fluence Energy fell 22% after cutting 2026 revenue guidance to $2.4B from $2.9B-$3.1B and forecasting a $200M EBITDA loss, while Lennar missed Q3 estimates with EPS of $1.19 versus $1.28 consensus and revenue of $8.05B versus $8.23B expected. Arm rose about 4% on management confidence in data-center chip demand, while Nike gained 1.5% after appointing Alexandre Arnault to its board.

Analysis

GNRC’s re-rating should be constrained by execution rather than headline contract value. The relevant question is whether Amazon’s commitment converts into dedicated manufacturing capacity without impairing the company’s traditionally higher-margin residential/business mix; large hyperscaler programs typically carry lower gross margins, milestone-based working-capital demands, and customer concentration risk. The equity purchase right also aligns Amazon but creates a ceiling on near-term upside if exercised near prevailing prices; watch disclosed backlog conversion, capex, and gross-margin guidance over the next 1-3 quarters. Cummins (CMI) and Caterpillar (CAT) are the likely second-order read-through beneficiaries if hyperscaler backup-power demand broadens beyond a single vendor.

FLNC’s reset is more consequential than a typical miss because negative EBITDA at lower revenue implies fixed-cost absorption and/or project execution issues, not merely deferred demand. This can tighten surety, working-capital, and customer-financing conditions across independent storage integrators, favoring vertically integrated competitors such as Tesla (TSLA) and Wärtsilä (WRT1V). A sector-wide demand slowdown would be bearish for TSLA Energy too, but a company-specific project-quality issue would instead accelerate share gains for integrated suppliers over 6-18 months.

LEN’s earnings sensitivity is increasingly about incentives and land-option discipline: weaker margins can lag volume softness by several quarters as older land is delivered. The 1.2% reaction appears modest relative to the risk that mortgage-rate volatility forces more buydowns, pressuring FY27 gross margin and impairing smaller builders with less balance-sheet flexibility. NKE’s board addition and ARM management confidence lack near-term earnings transmission; neither merits chasing without a measurable revision to demand, royalty growth, or guidance.

Key Decisions for Investors

• Do not chase GNRC’s initial move. Establish a 3-6 month long only if management quantifies contract margin, capex, and 2027 capacity while maintaining consolidated gross-margin guidance; use a stop on evidence of material margin dilution or working-capital build. Prefer CMI as a lower-beta hyperscaler-power proxy if GNRC’s valuation prices in full contract conversion immediately.
• Initiate a 6-12 month pair: long TSLA / short FLNC, sized modestly given TSLA’s broader auto beta. The thesis is that financing, execution, and scale advantage shift storage awards toward vertically integrated vendors; cover the FLNC short if it restores positive EBITDA timing without further revenue deterioration or if TSLA Energy margins weaken materially.
• Maintain an underweight in LEN and use ITB as the liquid sector hedge over the next 1-3 months. Add to the short only if order trends weaken or gross-margin guidance falls further; invalidate on a sustained mortgage-rate decline that reduces incentive intensity and reaccelerates new-home orders.
• Treat ARM and NKE as watch items rather than event trades. For ARM, require evidence of data-center royalty/revenue acceleration at the next results; for NKE, require inventory normalization and a credible gross-margin inflection before assigning value to governance-driven optimism.