Sandisk’s 84.6% Margin Is Real. The Valuation Knows.

Sandisk exited FY2026 with a much larger and more profitable revenue base. Fourth-quarter revenue was $8.97 billion, up 51.0% from $5.95 billion in Q3 and 372.0% from $1.90 billion a year earlier. Management attributed approximately two-thirds of sequential growth to higher pricing and one-third to higher volumes. That split matters because this was not simply a shipment recovery: price realization supplied most of the incremental revenue and operating leverage.

The mix also changed. Datacenter revenue increased 103.0% sequentially to $2.98 billion, while Edge rose 48.0% to $5.43 billion. Consumer revenue declined 32.0% sequentially to $556 million and was 5.0% below the prior-year quarter. Datacenter therefore accounted for roughly one-third of quarterly revenue, compared with less than one-quarter in Q3. For the full year, Datacenter revenue rose 437.0% to $5.15 billion, Edge increased 195.0% to $12.16 billion and Consumer grew 29.0% to $2.94 billion, according to the Sandisk Q4 FY2026 earnings release.

Margins changed even faster than revenue. GAAP gross margin reached 84.6%, up 6.2 percentage points sequentially and 58.4 points year over year. Operating expenses declined 1.0% sequentially to $545 million even as revenue expanded by more than half, lifting GAAP operating income 71.0% to $7.04 billion. The resulting operating margin was 78.5%, versus 69.1% in Q3 and 0.9% a year earlier. GAAP diluted EPS increased to $43.97 from $23.03 sequentially and a loss of $0.16 a year ago.

Cash generation confirmed much of the accounting improvement. Operating cash flow was $7.13 billion and capital expenditure was $43 million, producing $7.08 billion of free cash flow. Adjusted free cash flow was lower at $5.04 billion after incorporating negative $110 million of Flash Ventures activity and $1.94 billion associated with NBM prepayments and deposits. The distinction prevents the headline free-cash-flow number from being treated as entirely representative of recurring quarterly conversion.

The quarter strengthens the case that Sandisk’s earnings reset is more than a volume rebound. Revenue growth was accompanied by higher pricing, a richer datacenter mix and limited sequential operating-expense growth. Those three changes explain why a 51.0% sequential revenue increase produced a 71.0% increase in operating income. For FY2026, Sandisk generated $20.25 billion of revenue, $12.39 billion of operating income and $11.49 billion of free cash flow, compared with a $1.38 billion operating loss and negative $120 million of free cash flow in FY2025.

The next-quarter outlook indicates that the higher revenue base has not yet reversed. Management expects Q1 FY2027 revenue of $10.30 billion to $10.80 billion, a midpoint of $10.55 billion and an implied 17.7% sequential increase. Non-GAAP gross-margin guidance is 83.0% to 85.0%, placing the midpoint near Q4’s 84.6% GAAP result. Non-GAAP diluted EPS is expected to be $44.00 to $46.00. A full GAAP EPS reconciliation was not available because management could not quantify all adjustments with certainty.

Customer arrangements also expanded. Since announcing five New Business Model agreements during the April earnings call, Sandisk signed five more: three with new customers and two expansions of previously signed agreements. These arrangements may deepen customer relationships, but their associated prepayments and deposits also complicate comparisons between reported and adjusted cash flow. The Sandisk Q4 FY2026 earnings release explicitly defines adjusted free cash flow to remove NBM payment effects because management does not consider them indicative of core underlying cash flow.

The balance sheet and capital allocation also changed. Sandisk ended the year with $4.76 billion of cash and no debt in the supplied XBRL point values, equivalent to $4.76 billion of net cash. It repurchased $4.52 billion of common stock during FY2026, and the board added a $14.00 billion authorization, leaving $15.50 billion available. That authorization is large relative to the cash balance, so execution will depend on future cash generation and the prices paid rather than the headline amount alone.

There is no prior SageNoodle fair value to carry forward, so this earnings update establishes an initial valuation rather than revising an earlier estimate. Our base case applies a 20.0x multiple to supplied TTM EPS of $73.27, producing fair value of $1,465.40 per share. Against the current price of $1,692.59, that implies 13.4% downside and falls within the Fairly Valued band under our methodology. The shares trade at 23.1x TTM earnings and a 4.4% TTM free-cash-flow yield.

The 20.0x base multiple assumes that Sandisk retains a meaningful portion of the datacenter and pricing-led earnings improvement but does not deserve a structurally high multiple for peak or near-peak profitability. The bear case assumes TTM EPS contracts 40.0% to $43.96 and applies 12.0x, yielding $527.50. The bull case assumes EPS grows 20.0% to $87.92 and applies 25.0x, yielding $2,198.00. These are explicit valuation assumptions, not company guidance.

For reference, the snapshot EV/EBITDA estimate of 20.6x uses the supplied $262.4 billion market capitalization, $4.76 billion of net cash, $12.39 billion of FY2026 operating income and $149 million of depreciation and amortization. The calculation is an approximation because the company did not disclose an EV/EBITDA figure. The main conclusion is unchanged: the quarter improves confidence in near-term earnings, but the current valuation requires a significant part of that earnings power to persist.

The bearish valuation could prove too conservative if datacenter deployments, higher-value customer mix and the additional NBM agreements make pricing and cash flow more durable than a normal memory cycle. Q1 guidance supports that possibility: revenue is expected to rise again while gross margin remains near the Q4 level. If EPS grows rather than normalizes and the market continues to assign a premium multiple, the bull-case value of $2,198.00 becomes plausible.

The more immediate threat is that Q4 profitability reflects unusually favorable pricing. Management said higher pricing generated roughly two-thirds of sequential revenue growth. A reversal in average selling prices would therefore affect revenue and gross profit simultaneously, while operating expenses would not necessarily fall at the same rate. The movement from a 26.2% gross margin a year ago to 84.6% in Q4 demonstrates the scale of operating leverage in both directions.

Customer and end-market concentration could also challenge the thesis. Datacenter growth is now central to the earnings reset, while Consumer declined both sequentially and year over year. Changes in deployment timing, customer relationships or long-term agreements could produce uneven quarterly results. The company also identifies reliance on key partners, including Kioxia, as well as manufacturing ramps, technology transitions, supply disruptions and competitive pricing among its principal risks in the Sandisk Q4 FY2026 earnings release.

Finally, capital allocation could dilute rather than create value if the expanded repurchase authorization is used aggressively at prices above normalized intrinsic value. The remaining $15.50 billion authorization is not an obligation, but it is substantial relative to current cash. Future quarters need to show that adjusted free cash flow remains strong after separating NBM-related cash movements and that repurchases reduce shares at economically sensible prices.