Sandisk jumps as much as 7.8% ahead of S&P 100 inclusion

Sandisk shares rose as much as 7.8% intraday on September 18, 2026, and were still up about 7.5% around midday. The Motley Fool attributed the rally to buying ahead of the S&P 100 inclusion effective September 21, with index and ETF buying likely driving the move. The gain came before the stock's September 22 analyst initiation and its climb toward $1,875 the following week.

• Intraday high move: up as much as 7.8%
• Still up about 7.5% at 12:34 p.m. Eastern
• Catalyst: S&P 100 inclusion effective September 21