Why the S&P 500’s No. 1 Performer Is Invisible in Your Tech ETFs

When a stock like Sandisk (SNDK) rallies 30% in a day as it did last week, tech lightweights like me think, “Wait, wasn’t that company around a long time ago — and then went away?” SNDK started in the late 1980s and gained a reputation as a leader in the flash memory business. The company went public in 1995, but by 2016, it was plucked out of public company status by Western Digital (WDC). It returned to public markets with some fanfare, opening for trading on Feb. 14, 2025. And oh, how investors have fa ...