Why is ASML stock dropping today?

This looks more like a positioning unwind than a thesis break. When a high-quality monopoly supplier sells off with lower-quality peers despite intact out-year visibility, the market is telling you factor exposure and valuation duration are dominating fundamentals. That usually hurts the highest-beta European equipment names first, while ASML should still outrun the basket once forced sellers clear.

The next 1-3 months hinge on whether customer capex commentary validates the improved outlook. If foundry and logic spending stays firm, the current move is mostly multiple compression and can reverse quickly; if bookings or lead-times soften, the de-rating can persist and spill into U.S. names like AMAT, LRCX, and KLAC. The key falsifier is not the share price, but any downgrade in order cadence or 2025/26 capex plans.

Contrarian takeaway: the consensus is treating long-term scarcity as a floor, but in a risk-off tape the floor is actually cash-flow yield, not narrative. Elevated valuation makes ASML behave like a long-duration asset, so it can underperform for weeks even with good guidance. That said, the selloff looks more overdone in the weaker European peers than in ASML itself, where structural dominance remains intact.