A broad AI-and-semiconductor selloff routed the chip-exposed rungs of the drone basket, sending edge-silicon name Lattice down double digits, while defense primes caught a safe-haven bid led by L3Harris.

The leader was L3Harris (LHX), up 2.7% to $254.23 on the C4ISR-and-electronic-warfare chokepoint — the sensing and spectrum layer that ties the drone kill chain together. The move was not a drone-specific catalyst but a rotation: Thursday's tape was a sharp risk-off day in which the Nasdaq Composite fell 2.60% to 26,008.86 and the Philadelphia Semiconductor Index dropped 6.7%, while the Dow edged up 0.02% to 52,867.98 as money fled high-beta AI names for defensives. Defense was the destination — Lockheed Martin rose 7.0% on the broader tape — and the drone basket's prime rung followed: RTX +1.6% to $194.71, BAE Systems' ADR (BAESY) +1.5% to $104.17, Leonardo DRS (DRS) +1.1% to $34.30 and Motorola Solutions (MSI) +2.2% to $477.81. AeroVironment (AVAV) was roughly flat at +0.2% ($117.70) and Kratos (KTOS) slipped 1.2% to $38.27.

The laggard was Lattice Semiconductor (LSCC), down 10.6% to $96.40 on the autonomy-compute chokepoint — the low-power FPGA rung that handles sensor fusion and flight-control logic at the edge of the airframe. There was no company print; this was a high-beta semiconductor caught full-force in the sector rout. The selloff was triggered by revived doubts about the AI buildout, amplified by a Lam Research supply warning that chip-supply constraints could persist through 2027, and it dragged every chip name in the basket lower.

The read-through hit the silicon and energy rungs hardest. The autonomy-compute names fell with the semis: NVIDIA (NVDA) −4.4% to $212.21 and Ambarella (AMBA) −4.4% to $63.12, with Qualcomm (QCOM) −2.9% to $172.83. The rare-earth-magnets chokepoint — the structural China dependency this vertical maps — was broadly red: USA Rare Earth (USAR) −5.9% to $9.63, Lynas (LYSCF) −4.9% to $7.80, Unusual Machines (UMAC) −4.2% to $16.27 and MP Materials (MP) −2.4% to $38.56. The batteries rung, which gates endurance, softened too: Amprius (AMPX) −4.8% to $7.91 and EnerSys (ENS) −4.7% to $168.67, though Enovix (ENVX) held green at +0.4% to $2.55, the lone gainer on the cell rung.

The calendar now turns on China and the FAA. The one-year suspension of Beijing's October 2025 rare-earth export controls expires November 10, and the separate gallium/germanium/antimony export-ban suspension lapses November 27 — the two dates that most directly reprice the magnet and sensor straits. The FAA's Part 108 BVLOS final rule, the demand unlock for domestic commercial fleets, remains overdue against its earlier target and is expected by year-end, and the NDAA §844/§854 ban on Chinese-melted magnets in DoD systems takes effect January 1. Until the November export-control dates clear, the magnet rung, not the airframe rung, stays the variable to watch.