Key Points Sandisk officially becomes an S&P 100 company on Monday, Sept. 21, along with Dell Technologies, Palo Alto Networks, and Arista Networks. Sandisk shares have risen more than 600% in 2026, more than any other stock in the S&P 500. The money tracking the S&P 100 is small compared to the money tracking the S&P 500, which Sandisk joined last November. 10 stocks we like better than Sandisk › On Monday, Sept. 21, Sandisk (NASDAQ:SNDK) takes a spot in the S&P 100, a subset of the S&P 500 (SNPINDEX:^GSPC) made up of 100 of its largest blue-chip companies. Dell Technologies , Palo Alto Networks , and Arista Networks enter with it. The announcement came from S&P Dow Jones Indices on Sept. 4, and the changes take effect before Monday's open.
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