Flex Climbs 130% in 6 Months: Is the Stock Still Worth Buying?

Flex delivered Q4 fiscal 2026 revenue up 17% YoY to $7.5B with record adjusted gross margin of 9.9% and adjusted operating margin improving to 6.7%. CPI revenue grew 31% and Flex is targeting 65%–75% CPI revenue growth in fiscal 2027 (fiscal 2028 expected >80%), with total fiscal 2027 revenue of $32.3B–$33.8B (18% growth at midpoint) and adjusted EPS up 32% at the midpoint. The company also completed its EP2 acquisition to add utility-grade grid modernization solutions, offset by temporary CPI margin pressure from power/thermal investments and cloud ramp costs; shares have surged 129.6% over six months versus Zacks industry +52.5%.

Analysis

FLEX is no longer being priced like a low-margin EMS name; it is being treated as a levered proxy for AI power density. That is constructive, but it also means the stock now trades on execution quality and mix durability more than on headline revenue growth. In a business with still-modest margins, the real question is whether new infrastructure wins convert into sustained ROIC expansion or simply consume more working capital and capex.

The competitive read-through is more important than the company-specific story. A stronger FLEX can pressure fragmented contract manufacturers and lower-value peers first, with SANM the most exposed if investors continue rewarding AI/data-center mix over legacy manufacturing. On the customer side, hyperscalers and colocators benefit from having a supplier that can bundle power, thermal, and hardware integration, but that same concentration raises the risk that a single customer budget pause creates an abrupt air pocket.

Near term, the stock is vulnerable to a “good but not better” quarter because the move has already discounted much of the guidance step-up. The next 1-3 months are about whether backlog converts without margin slippage; over 6-18 months, the thesis only holds if gross margin and operating margin keep inflecting while acquisitions remain accretive. The contrarian risk is that AI infrastructure spend is being viewed as linear when it is actually lumpy and prone to deferral when financing, utilization, or hyperscaler capex priorities change.

Key Decisions for Investors

• Long FLEX / short SANM on a 1-3 month horizon; this is the cleanest relative-value expression of AI-infrastructure mix vs. legacy EMS exposure. Target 15-20% relative outperformance, with the thesis broken if FLEX cuts CPI growth or SANM closes the AI mix gap.
• Do not chase FLEX outright after the 129% six-month move; use a 5-10% pullback to initiate exposure via a 3-6 month call spread. This caps downside if the market starts pricing in a slower conversion of new programs.
• For existing FLEX longs, sell covered calls into further strength or trim 20-30% on any additional post-guidance spike. The near-term upside is likely less than the implied move unless management confirms margin expansion ahead of schedule.
• Set an alert on hyperscaler capex commentary from GOOGL and peers; if cloud capex rolls over, reduce FLEX quickly. That would be the highest-beta falsifier for the thesis within 1-2 quarters.
• Watch next-quarter gross margin and working-capital intensity as the key execution screen. If margin stalls while revenue accelerates, the market should de-rate the multiple despite headline growth.