🔥 SNDK +11%. MU +4%. SK Hynix +2%. IS THIS STILL ONE MEMORY TRADE?

Friday’s memory rally looked straightforward — until you look underneath it.

$SanDisk Corp.(SNDK)$  : +10.99%

$Micron Technology(MU)$  : +3.92%

$SK hynix(SKHY)$ : +2.46%

$Intel(INTC)$  : -0.18%

At first glance, SNDK looks like the clear winner.

But there was another catalyst: SanDisk officially joined the S&P 100 on Monday, Sept. 21. Importantly, SanDisk replaced Colgate-Palmolive, while Nike was also removed separately and replaced by Palo Alto Networks. 

Index inclusion can create mechanical buying from funds tracking the index.

But here’s where it gets interesting:

That buying may not be large enough to explain the entire move. SanDisk was already an S&P 500 member, and estimates suggest the incremental S&P 100 buying is relatively small compared with the stock’s normal trading volume. 

And SanDisk has a real fundamental memory story behind it.

The company has reported extremely strong growth, while Micron is also benefiting from tight memory supply and AI-driven demand. Micron’s next earnings report on Sept. 30 could provide another important read on the memory cycle. 

So I wouldn’t dismiss Friday’s move as simply an index event.

The more interesting question is:

🧠 Are investors pricing a genuine multi-year memory cycle — or are we starting to see momentum pile into the hottest names?

Because if memory prices remain tight, the gains could have fundamental support.

But if pricing rolls over, today’s biggest winners could look very different.

Is memory still one trade — or are SNDK, MU and SK Hynix starting to tell three different stories? 👀