The humanoid and industrial-automation basket sold off broadly in a risk-off rotation, with Moog down 7.2% leading a fall in the actuator and rare-earth chokepoints while Teradyne edged green.

The tape was mostly red, and the standout green was in the platforms-and-integrators layer. Teradyne rose +0.9% to $383.15 — the test-and-automation name that owns Universal Robots and MiR, a durable cash generator whose robotics exposure rides on installed-base automation rather than the speculative humanoid multiple. PTC added +0.7% to $153.52 in the simulation-and-software choke. Those two aside, nearly everything that makes the physical parts of a robot — the actuators, gears, motors and their magnet inputs — traded lower, in line with a broad market pullback on rising Treasury yields and Walmart's soft quarter.

The laggard was the frameless-motors-and-actuators choke. Moog fell −7.2% to $381.52, the precision-actuation and motion-control supplier whose components sit inside both robotic and aerospace motion systems; the move came with the broad defense-and-precision-hardware selloff rather than any company news. The rare-earth-magnet-and-motor-materials chokepoint that gates every servo went with it: USA Rare Earth −5.4% to $17.11, Energy Fuels −6.4% to $13.90 and MP Materials −2.9% to $55.04 — the domestic magnet-supply names unwinding on the same risk-off rotation that hit the rest of the high-beta hardware complex.

The bearings, reducers and Japanese motion-control anchors followed. Schaeffler's US line −4.5% to $8.90, THK −4.0% to $21.23 and Nidec −3.1% to $3.65 in the ball-screw, linear-guide and integrated-motor chokepoints; RBC Bearings −3.1% to $504.61 and Allegro MicroSystems −3.0% to $37.19 on the sensing side. The batteries-and-power-density names that gate untethered runtime also gave back — Amprius −4.0% to $10.20, Enovix −3.8% to $3.27 — while Tesla, the humanoid platform bellwether, eased −1.7% to $345.13. The read: this was a uniform de-rating of the physical-AI hardware stack, not a break in any single chokepoint.

The calendar turns concrete in the next two weeks. Ambarella (robot-vision silicon) and NVIDIA both report fiscal Q2 on August 26 — the edge-compute read for every autonomy stack — and THK reports Q2 on August 31, the same day Tesla has targeted its Optimus V3 reveal and Fremont production start, the single largest demand catalyst for the actuator and reducer chokepoints. Beyond that, the ABB Robotics divestiture to SoftBank is expected to close by late 2026, NVIDIA's Isaac GR00T reference humanoid is slated to ship from Unitree, and RoboBusiness convenes in Santa Clara October 19–21. The supply thesis — that humanoids are gated by motors, gears and magnets, not software — is unchanged; Thursday just repriced how much the market will pay for it ahead of proof.