Sandisk Q3 Trounces Expectations – Margin 78.4%, Q4 Guide Soars, $6B Buyback

What happened

Sandisk's fiscal Q3 2026 results demolished the cautious thesis laid out just weeks earlier, with revenue surging 252% year-over-year and adjusted gross margin hitting 78.4% – far above the 65–67% range the Master Report had penciled in as a best-case. Management guided Q4 revenue of $7.75–$8.25 billion and EPS of $30–$33, authorized a $6 billion buyback, and declared a zero-debt balance sheet, signaling a record upcycle. This outcome contradicts the filing-based evidence of declining datacenter ASP per GB and persistent underutilization charges that underpinned the prior sell-rated perspective. The results suggest that the market's 'AI + sold-out NAND' narrative is not only intact but accelerating, as Sandisk converts tight supply into unprecedented pricing and mix gains. However, the sustainability of such peak-cycle margins must be weighed against the $1.2 billion Kioxia supply-security cash commitment that will compress through-cycle free cash flow.

Implication

The massive beat and bullish guide vindicate the market's pricing power thesis and suggest that the Master Report's 'POTENTIAL SELL' rating is too cautious at current levels. With $6B buyback and zero debt, management is signaling confidence in cash generation, but the stock already reflects peak-cycle economics. The earlier concerns about datacenter ASP compression and underutilization have been temporarily overridden by stronger-than-expected demand and pricing. However, the underlying structural risk – the $1.2B Kioxia cash drain and the cyclical nature of NAND – remains, making it unlikely that these margins are sustainable into a downturn. Investors should consider trimming excess exposure on strength while acknowledging the near-term positive momentum.

Thesis delta

The prior thesis argued that Sandisk lacked pricing power and that margin expansion was fragile, supported by filing evidence of declining datacenter ASPs and underutilization charges. The Q3 report flips that narrative: 78.4% gross margins and a 252% revenue surge prove that AI-driven NAND tightness is generating real pricing leverage, at least temporarily. The debate now shifts from whether the upcycle is real to how long it can persist, with the $1.2B Kioxia commitment acting as a structural headwind on through-cycle returns.