Flash memory producer Sandisk Corp. (NASDAQ: SNDK) officially entered the S&P 100 this week, another accolade for the soaring stock and a move that puts it alongside some of the market’s most prominent megacaps. Inclusion in major indices like the S&P 100 brings prestige, but it also means index-tracking funds must buy the stock.
The change was announced on Sept. 4, and the stock gained nearly 12% in the session before quietly surrendering those gains over the next week. Now the stock is ripping higher again as indices rebalance at quarter end, but how much of this bull case rests on S&P 100 inclusion? The answer is likely that the index rebalancing has minimal impact, and the stock’s 2026 surge is a story of NAND demand and a company at the peak of its earnings cycle.
