I would not follow this blindly. At +535% YTD, you are no longer early. You are deciding whether to pay for peak narrative plus tightening supply.

Let’s separate signal from noise.

1) Tepper buying: meaningful, but not a green light

David Tepper tends to lean into macro dislocations, not chase retail momentum. His entry tells you one thing: he believes the cycle still has legs.

It does not tell you the entry price is attractive. He can absorb volatility. Most cannot.

2) The real driver: memory cycle turning + AI demand

The move in SanDisk is tied to:

AI infrastructure pulling forward NAND demand

Supply discipline after years of underinvestment

Spillover from HBM strength (even though NAND is a different segment)

Add Seagate Technology supply warnings, and you get a classic scarcity premium expansion.

3) Where the risk sits now

At this stage, upside depends on two fragile assumptions:

AI capex remains aggressive into H2

Supply stays constrained longer than expected

If either weakens, memory stocks do not drift down. They re-rate sharply.

Memory is historically one of the most cyclical segments. The market tends to overpay at exactly this point in the narrative.

4) What this price action actually signals

This looks like mid-to-late cycle acceleration, not early discovery:

Broad participation across memory names

High-profile macro investors stepping in

Supply narrative dominating fundamentals

That combination often precedes volatility, not smooth upside.

5) So follow or sit out?

If you force a decision:

I would not chase here

I would only enter on pullbacks or dislocations, not strength

If you already have exposure, holding is reasonable.

If you are fresh capital, you are effectively betting that the cycle overshoots expectations, not just meets them.

My blunt view:

Tepper is buying the cycle continuation.

At current levels, you are being asked to buy the cycle peak probability distribution.