Four of the companies that build the machinery of automation reported June-quarter results in the first week of August. All four beat expectations. All four fell — Rockwell Automation by 7.4% the session after it reported, Symbotic by 16.2% in a single day, Cognex by about 15% over the following fortnight. Between them they cover the physical layer that AI is supposed to be moving into: the cameras that inspect parts, the controllers that run a production line, the robots that pick cases in a distribution center.

The quarter that didn't count

Cognex sells machine-vision systems — image-based barcode readers, smart cameras and deep-learning software that let a factory or warehouse locate, identify and inspect parts without a person looking at them. June-quarter revenue rose 16.9% to $291m. Gross margin reached 70.6%, against 67.4% a year earlier, and operating income nearly doubled. Management raised full-year adjusted earnings guidance to roughly $1.66, up about 63% at the midpoint, and lifted its outlook for semiconductors, electronics and packaging to double-digit growth on AI infrastructure spending. Logistics, a quarter of 2025 revenue, grew double digits for a tenth consecutive quarter.

The objections raised against the print were small. Revenue landed fractionally under consensus, European revenue fell 15% in constant currency, and the shares had nearly doubled off a $34.60 low. Management also flagged about 75 basis points of gross-margin pressure in the second half from memory-chip price inflation — the same AI-driven memory shortage that is inflating its customers' bills — and said price increases should fully offset it by 2027.

What Cognex is not yet is an AI hardware story in dollars. Its data-center supply-chain business, inspecting components and server racks, is a low-single-digit share of revenue, though growing more than 30%. The durable asset is the largest installed base in industrial machine vision, which supplies proprietary training data for edge models; the threat is Keyence, the Japanese sensor maker that has consistently grown faster, and Zebra Technologies, whose machine-vision unit is compounding at strong double digits. Cognex added 4,500 new customers so far this year.

At 57.7x trailing and 36.0x forward earnings, against a consensus that has 2026 earnings per share reaching $1.68 versus $0.68 reported for 2025, the stock is expensive in absolute terms and cheaper than it has been all year relative to its own profits.

Where the de-rating is earned

Rockwell Automation, the largest pure-play industrial automation supplier and owner of the Logix and FactoryTalk control ecosystem that factories rarely switch away from, grew 10% organically and raised guidance for a second straight quarter. Warehouse and e-commerce orders rose 30%. But Lifecycle Services shrank 2% organically, its book-to-bill was 0.97, and management conceded the business is only now back to pre-COVID controller volumes. At 33.1x forward earnings against consensus 2027 revenue growth of 5.5%, the multiple was carrying more than the orders book.

Symbotic, which builds complete robotic warehouse systems for retail distribution centers, delivered the cleanest operational improvement: revenue of $721m, gross margin up to 22.3% from 16.6% six quarters ago, and a first meaningful GAAP profit. Yet growth is decelerating — 29.4%, then 23.1%, then 21.7% year on year — backlog is flat at $22.5bn, and more than 84% of fiscal 2025 revenue came from Walmart. The back-of-store rollout that would broaden it will not touch results until early 2028. At 47x trailing gross profit it is the most expensive name in the group on every measure.

Teradyne is the reason this group looks like a winner at all. Its shares are up 236% in twelve months on semiconductor test demand, where compute revenue rose sixfold; the other three average 22%. Its robot arms and mobile-robot business — the independent read on cobot demand — grew 33% to $100m, still only about 7.5% of sales.

What actually moved them

The premise of an automation trough is wrong: July's ISM Manufacturing index registered 55.6%, the highest since May 2022, with factory employment expanding for the first time in 33 months. The mid-August leg down came from the bond market. The 30-year Treasury yield hit a 19-year high on 18 August, and the Philadelphia semiconductor index fell 5% as higher discount rates cut what investors would pay for profits arriving later. Teradyne fell 8.8% that day alongside Aehr Test and FormFactor.

The result is uniform. Measured against trailing four-quarter gross profit — the least distorted lens where three of the four have volatile tax and stock-compensation lines — every name got cheaper over three months while its gross profit grew: Cognex from 15.0x to 13.4x, Rockwell 10.7x to 9.9x, Teradyne 25.0x to 21.7x, Symbotic 63x to 47x. Earnings are catching up to price. In late July and early August, Teradyne, Cognex and Rockwell each rolled from a steep uptrend into a shallower one, in that order, while Symbotic's spring downtrend eased on 19 August.

The setup

Where it stands — Cognex's profits are accelerating while its multiple compresses; Rockwell and Symbotic are de-rating against outlooks that justify it. Would confirm — Cognex September-quarter gross margin holding near 70% despite the flagged memory-cost headwind. Would invalidate — Cognex logistics revenue breaking its double-digit growth streak, or full-year guidance trimmed below $1.64. Watch next — Cognex reports third-quarter results in late October; Rockwell closes fiscal 2026 in September. Valuation — Cognex 57.7x trailing and 36.0x forward earnings, against 78.7x trailing in early May.