The European AI Trade: Stretched Multiples, Niche Crowding, and Rising Shorts

With Wall Street’s tech giants heavily extended, capital is rotating into Europe to find the "picks and shovels" of the AI boom. Because Europe lacks US-style software hyperscalers, this trade is strictly focused on hardware, specialized semiconductor supply chains, and power infrastructure. While the broader European market is flat, the semiconductor index has nearly doubled year-to-date. Here is where the capital is concentrated:

Core Semiconductor & Hardware Giants

Institutional flows are shifting out of defensive large-caps and into pure-play semi equipment and connectivity:

Aixtron & BE Semiconductor (Besi): Both leading the pack, up ~200% YTD (Aixtron trades at a steep 47x forward P/E).

STMicroelectronics: Shares have more than doubled (trading at 37x forward P/E).

Nokia: Up >100%, driven by surging demand for data center cloud routing hardware.

High-Beta Mid & Micro-Caps

With few AI options in Europe, capital chasing niche tech has triggered explosive, vertical moves in smaller names:

Kalray (Chip Design) & Soitec (Silicon Wafers): Both have skyrocketed more than fivefold from their recent lows.

Riber (Atomic Layer Equipment): Share price has more than tripled this year.

The Physical Infrastructure Derivative

Because Europe’s AI play is structural rather than software-driven, the data center energy supply chain is seeing massive secondary inflows:

Prysmian: Up >70% YTD on intense demand for specialized optical fibers and power cables.

Siemens Energy: Up ~40% YTD as grid electrification needs accelerate alongside data center expansion.

The "easy money" phase of this sector rotation is over. Because the European tech market is small, massive capital inflows have led to intense niche crowding and stretched multiples. Momentum is also facing headwinds from the short side—hedge funds like Two Sigma have already built a 4.5% short position against Soitec, signaling that it is time to switch from broad momentum to strict stock selectivity.

-Chart from FT