Linde, the world's largest industrial-gas supplier and the company that pipes ultra-high-purity nitrogen, oxygen, argon and hydrogen over the fence into semiconductor plants, told investors in late July that its backlog of contracted gas-supply projects had reached a record $8.1bn. It rose by $1bn in a single quarter. The additions were not vague: roughly $1bn of work for advanced-node fabs in the western United States and a Taiwan joint venture worth about $800m for air-separation units plus hydrogen production. Electronics was the fastest-growing end market in the business, volumes up 18% from a year earlier. Group revenue set a record at $9.29bn and management raised full-year earnings guidance to $17.70–$17.90 a share.

The shares have gone nowhere for a year.

The molecule rung

This is an unusual business model dressed as a commodity. Linde builds an air-separation plant on the customer's site and signs a supply contract that typically runs fifteen years on take-or-pay terms — volume is contracted before the fab is energized, and the plant earns something close to a regulated utility's return without the regulator. Projects must clear a double-digit unlevered return hurdle and ramp over two to three years. That is why a backlog number matters more here than an order book does at a machinery company: it is already-sold revenue with a start date.

Advanced logic and high-bandwidth memory consume more gas per wafer than the nodes they replace, and every new fab and advanced-packaging line needs its own plant. So the gas majors should be a clean derivative of the same buildout that carried the equipment makers they sit beside — Lam Research, Applied Materials and Teradyne each more than tripled over the past twelve months, with Ultra Clean Holdings up 239.5%.

None of that reached the gas layer. Linde is up 1.4% over twelve months, Air Products 3.9%, and Air Liquide — the French major, the closest thing to a control on the same customers — is down 8.6%, the worst of the three, despite a record €6bn backlog and more than €1bn of electronics investment decisions in the first half alone, about 1.5 times its total for all of 2025, including a €200m carrier-gas contract with SK hynix for high-bandwidth-memory packaging.

The price of a dollar of gross profit

Earnings multiples are useless for this comparison. Air Products' trailing price-to-earnings ratio reads -1,467x, an artefact of a loss-making window. Gross margins differ too widely — roughly 47% at Linde against 33% at Air Products — for revenue multiples to compare anything. What travels is the price paid per dollar of trailing gross profit.

Linde's has compressed without interruption: 17.1x a year ago, 15.8x six months ago, 15.0x three months ago, 13.9x now. Its own fiscal year-ends read 17.5x for 2023 and 16.7x for 2024. The denominator is not shrinking — trailing gross profit went from $13.32bn to $16.18bn. Forward earnings sit at 27.3x against 31.3x trailing, at or just under the roughly 28x premium the shares have historically commanded.

Air Products has not moved at all. Its multiple was 16.8x at fiscal 2023 year-end, 16.9x in 2024, 16.1x in 2025 and 16.82x today. A flat multiple on a flat base: gross profit grew 5.1%, to $4.04bn. That leaves the slower compounder carrying a 21% premium to the faster one. Linde also retired 1.9% of its diluted shares over the year; Air Products' count is unchanged at 222.8m, and management said buybacks only come into view in late fiscal 2027 once capital spending falls.

Why each one is being ignored

The two cases are not the same. Air Products' flat year is self-inflicted and largely accounted for: it cancelled the Louisiana Clean Energy Complex and the Casa Grande hydrogen facility and booked a pre-tax charge of up to $2.9bn, producing a $2.1bn quarterly operating loss. Beneath it, the gas business is intact and improving — adjusted earnings of $3.47 a share, up 12%, an operating margin of 25.6% up more than 100 basis points, and guidance raised to $13.39–$13.49. Capital spending is being cut to about $3.5bn this fiscal year and roughly $3.0bn next. Its own backlog is near $3bn, two-thirds of the pipeline skewed to semiconductors, anchored by named sockets: on-site nitrogen, oxygen, argon and hydrogen plants for Samsung's new Pyeongtaek fab, phasing in from 2028, and supply to TSMC's Arizona 2nm line.

Linde's problem is smaller and closer to home. The margin shortfall that knocked the stock in late July came almost entirely from Lincare, its US home-oxygen unit, a roughly $45m quarterly drag from labor inflation and reimbursement policy — about $180m annualized against a group earning a 29.5% adjusted operating margin. Management is weighing a sale. Excluding it, Americas margins would have risen.

Helium separates them further. Strikes on Qatar's Ras Laffan and the Hormuz disruption removed an estimated 30% or more of global helium production, taking spot prices from about $300 per thousand cubic feet to $600–900. Linde captured strong pricing but lost the benefit to shipment dislocation costs. Air Products drew 40% of its quarterly helium volume from its own Texas cavern and took a 2% headwind where it had guided 3%.

The common factor is not demand

One mechanism fits all three: these are the most bond-like equities in the chip supply chain — long-lived assets, contracted cash flows, dividends. On 18 August the 30-year Treasury yield topped 5.33%, a 19-year high. That same session Linde's 50-day average crossed below its 200-day, ending an uptrend it had held since spring. Air Products, oddly, moved the other way after its guidance raise and its 50-day sits above its 200-day. The demand evidence points one direction and the discount rate points the other.

The setup

Where it stands — Linde's gross profit is compounding at 21% while its multiple sits at a three-year low; Air Products' multiple has not moved in three years.

Would confirm — Linde ends 2026 with backlog still above $8bn after roughly $1.3bn of project start-ups, and electronics volumes hold double-digit growth.

Would invalidate — Third-quarter earnings below the $4.45 guidance floor, or backlog falling under $7bn as start-ups outpace new wins.

Watch next — Linde's third-quarter results in late October; Air Products' fiscal fourth quarter and fiscal 2027 capex guide in November.

Valuation — Linde 13.9x trailing gross profit, 13.6x forward, against 17.1x a year ago; Air Products 16.8x trailing, 16.6x forward.