Shares of SanDisk Corporation surged to $11.09, up 12.59% from the prior week's close, after the company was added to the S&P 100 index before Monday's open — a move that forces billions of dollars in passive funds to buy the stock whether or not any fund manager wants to. SanDisk Joins the S&P 100 After a 600% Year — Is the Best Already Priced In?
Shares surged 12.59% to $11.09 as SanDisk officially entered the S&P 100 before Monday's open, capping a week that already saw the stock climb from $9.31 to $10.73. SanDisk shares have gained more than 600% this year, more than any other stock in the S&P 500. The question now: how much of the buying is mechanical — and how much reflects lasting value?
• Index Funds Now Have No Choice but to Buy
S&P 100 inclusion matters because it forces passive funds and index products that track the benchmark to buy SNDK, often over multiple days around the rebalance date.
That steady bid can narrow spreads, deepen liquidity, and support the tape even on choppy market sessions.
SanDisk joins alongside Dell Technologies, Palo Alto Networks, and Arista Networks, replacing Honeywell Aerospace, Nike, Simon Property Group, and Colgate-Palmolive — a symbolic rotation from old-economy blue chips toward AI-era infrastructure.
• A $15.5 Billion Buyback Adds a Second Buyer The index bid lands on top of an aggressive capital-return program. SanDisk's board approved an additional $14 billion repurchase program on Aug. 5, bringing total remaining buyback authorization to $15.5 billion.
Management moved swiftly, deploying roughly $4.5 billion during the fiscal fourth quarter alone to retire shares. That means both passive funds and the company itself are competing for the same limited float, a setup that tends to amplify upward price moves.
• Explosive Earnings Make the Valuation Less Scary Than It Looks
Fiscal fourth-quarter revenue came in at $8.97 billion, up 372% year over year, while gross margin reached 84.6%. Full-year revenue rose 175% to $20.2 billion, and the company swung from a $1.6 billion net loss to $11.4 billion of net income.
Operating cash flow reached $11.7 billion in fiscal 2026, compared to $84 million the year before. At roughly 24 times earnings, the stock isn't cheap — but the cash generation gives management real firepower.
• The Big Risk: Memory Cycles Haven't Been Repealed
If NAND pricing holds anywhere near current levels, SanDisk can fund the entire $15.5 billion buyback with under two years of cash flow. But if pricing rolls over the way it has in past cycles, the cash flow shrinks with it.
The real question is whether this promotion recognizes a lasting business transformation or arrives during an unusually profitable memory cycle. Index inclusion guarantees a tranche of structural demand, but it cannot insulate shareholders from a downturn in the chips SanDisk actually sells.