Three companies that supply the machinery makers of the chip industry — not the tools themselves, but the plumbing, chemistry and test hardware consumed inside them — each reported expanding margins over the past month and lifted their outlooks. Their shares were then sold down roughly twice as hard as those of Applied Materials, the largest buyer of what they make.

The trigger was not in any of them. On 18 August the 30-year US Treasury yield touched 5.33%, its highest level since 2007, on inflation and government-spending concerns and a wave of long-dated supply; Bloomberg reported the same session that global sovereign yields had reached multi-year highs. Over the four sessions to 21 August, MKS fell 13.7%, FormFactor 17.7% and Ichor 17.9%, against 8.9% at Applied Materials. None of the three released news in that window. A discount-rate shock falls hardest on earnings sitting in a 2027 order book, and that is where much of this layer's profit is booked.

What each one actually sells

MKS Inc. supplies vacuum and pressure control, gas delivery, radio-frequency power and lasers, and — through its 2022 Atotech acquisition — the electroplating chemistry and laser drilling used to build advanced circuit boards. Its Electronics & Packaging segment grew 44% year over year to $381m in the June quarter, faster than the $554m semiconductor segment. But MKS disclosed that, stripping out currency and palladium pass-through, chemistry sales rose 21%. The gap is lower-margin equipment: the recurring-consumable story is real, but it is currently being led by the machines that will consume the chemistry later. Group revenue rose 28.3% to $1,248m while gross profit rose 31.3% and operating income 85.9%. Net leverage is 3.0x trailing EBITDA, down a full turn in a year after a $100m voluntary term-loan prepayment.

FormFactor makes probe cards, the consumable contact arrays that test chips electrically while they are still on the wafer. It is the cleanest read here on advanced-packaging intensity: DRAM probe-card revenue rose 48.9% to $85m in the June quarter, with high-bandwidth memory roughly two-thirds of it, after two customers adopted its full-wafer contactor for HBM4 testing. Gross margin went from 37.2% to 50.7% in four quarters. The caveat is in the guidance: September-quarter DRAM revenue is flat, with mix shifting toward conventional DDR memory as customers chase better DDR pricing. The incremental growth this quarter comes from data-center logic and from co-packaged optics test, now expected to exceed $20m by quarter-end against $10-20m guided for the full year.

Ichor builds fluid-delivery subsystems — gas panels, chemical modules, welded components — largely to other companies' designs. Its gross margin has run 4.6%, 9.4%, 11.6% and 13.9% over four quarters, and management puts internal proprietary content at about 25% of what it ships, targeting 35% by year-end. It raised 2026 revenue growth guidance to at least 30%. That is a genuine inflection off a very low base — and it is still a broad wafer-equipment recovery rather than a packaging one: lithography customers are working down inventory into the December quarter.

What is being paid for the gross profit

MKS trades at 9.83x trailing gross profit, against 10.77x in early May, and at 21.3x forward earnings versus 42.7x trailing. FormFactor is at 21.6x trailing gross profit against 34.35x in early May — a 37% de-rating while its gross margin rose thirteen points — and 37.5x forward earnings versus 77.1x trailing.

Ichor is the outlier. At 20.4x trailing gross profit it is fractionally more expensive than the 19.70x it carried in May, the only one of the three whose multiple has not compressed. Its forward price/earnings ratio of 38.3x is the highest of the three, earned on a 13.9% gross margin against FormFactor's 50.7% and MKS's 47.7%. The gross profit Ichor booked over the last four quarters, near $103m, is about 7% below the prior four — so its 232% twelve-month share gain is multiple, not earnings. Operating cash flow was minus $15.9m in the June quarter on inventory build. And it completed a $200m at-the-market share sale, issuing 2.5m shares at an average $80.70, into a stock that closed at $60.20 on 21 August.

The demand is not in doubt. Applied Materials has raised its 2026 advanced-packaging outlook to more than 70% growth, and Lam Research expects its own packaging revenue to grow more than 50% in a wafer-equipment market it now sizes at $150bn. SK Hynix is projected to hold 54% of the HBM4 market next year. The open question is which supplier converts that spending into gross profit per dollar of revenue, and on what durable basis — a proprietary consumable that must be requalified to replace, or an assembly contract that can be rebid.

All three have slipped this summer from a strong uptrend to a milder one, their 50-day averages still above their 200-day. Over three months each fell about 12% while Applied Materials rose 12.8% and Micron 27.9%: the suppliers have lagged both their customers and their end market.

The setup

Where it stands — MKS and FormFactor got cheaper on gross profit while margins expanded; Ichor's multiple held as its trailing gross profit shrank.

Would confirm — Ichor's September-quarter gross margin printing inside its guided 14.5-15.5% range, with proprietary content reaching 30%.

Would invalidate — FormFactor's December-quarter DRAM revenue falling as DDR mix displaces high-bandwidth memory, or MKS chemistry growth slowing below 20% ex-pass-through.

Watch next — Third-quarter results from all three in late October and early November; FormFactor's Farmers Branch plant starts ramping in the fourth quarter.

Valuation — Trailing gross profit: MKS 9.83x, FormFactor 21.6x, Ichor 20.4x, against 10.77x, 34.35x and 19.70x in early May.