Three of the four chipmakers grouped in this brief reported results in the ten days to 7 August, and all three set revenue records. Microchip Technology — which makes the small embedded-control chips, analog parts and memory devices that run cars, factory equipment and appliances — reported June-quarter net sales of $1.485bn, up 38% year over year, with adjusted earnings of $0.76 a share against a $0.68 consensus. Its shares rose 13.9% on 7 August on about four times a quiet day's volume.

Rambus, which sells the buffer and clock chips that sit between a server's processor and its memory modules and licenses a large memory-architecture patent portfolio, posted record revenue of $207.4m, up 20.4%, with product revenue of $99.2m up 22% — the shipping hardware growing faster than the licensing base. It ended the quarter with $824.9m in cash and began a roughly $100m accelerated share repurchase on 5 August. Everspin Technologies, an 85-person maker of magnetoresistive memory — chips that keep their contents when power is lost — reported record revenue of $18.7m, up 41.9%, helped by a $40m, two-and-a-half-year development subcontract with a US prime defence contractor. It still ran a $4.4m operating loss.

The label does not fit the businesses

The grouping's premise is Compute Express Link (CXL), a standard that lets servers pool memory chips and share them across processors, easing the shortage of memory bandwidth that starves artificial-intelligence accelerators. On the 27 July call, Rambus management said "CXL remains a fragmented ASIC market" and that the company is doing intellectual-property enablement rather than selling CXL products; its new DDR5 chipsets are a low-double-digit share of product revenue, with the higher-capacity MRDIMM module parts material only in 2027. Microchip's data-centre business — guided to roughly $1bn of calendar-2026 revenue, up about 69%, on 14 design wins for its PCIe Gen 6 switches — is interconnect and storage plumbing, not memory pooling. Everspin's CXL work is a September conference demonstration and a 4 August memorandum of understanding with MaxLinear to evaluate its chips in AI servers — a framework, not a supply contract. Allegro MicroSystems, which makes magnetic position and current sensors for carmakers and industrial customers, books under 5% of revenue from AI data centres.

Sector move, not segment move

The July decline was industry-wide. The Philadelphia semiconductor index fell as much as 6% on 28 July, with SK Hynix down 14.65% and more than $1 trillion of chip-sector value erased on doubts about circular AI financing. Memory principals fell harder than this group over the same 30 days — SanDisk down 29.8%, Western Digital 21.1%, Micron 7.5% — while Nvidia rose 9.7% and Broadcom 10.1%. Allegro's 15.0% decline is indistinguishable from NXP Semiconductors at 15.5%, STMicroelectronics at 18.2% and ON Semiconductor at 13.5%: it followed the automotive analog group, not anything to do with memory. Rambus's 50-day average crossed below its 200-day on 22 July and Allegro's uptrend weakened on 3 August, but every name has risen sharply since the 29 July low, and all four remain well below their 52-week highs — Everspin 62%, Rambus 41%, Allegro 37%, Microchip 18%.

What the numbers say

Business momentum: CONTRADICTS the decline at three names. Microchip's gross margin has improved five quarters running (53.6%, 55.9%, 59.6%, 61.0%, 63.2%) against an $18.6m loss a year earlier; consensus has fiscal-2027 revenue at $6.22bn, up 33.3%. Rambus guided September revenue to $210–216m and consensus carries $825.6m for 2026 and $987.9m for 2027. Allegro is the exception and INCONCLUSIVE: revenue up 27.5% to $259.2m, but a 9.8% operating margin, and price targets cut on 31 July — TD Cowen to $48 from $66, Mizuho to $58 from $67.

Valuation: a genuine de-rating at two, not at the third. Rambus trades at 45.7x trailing and 33.4x forward earnings, with price-to-sales down to 14.56x from 16.82x on 3 May and price-to-gross-profit 18.60x against 20.92x — multiples down 11–15% while revenue growth accelerated. Microchip's 117x trailing earnings is distorted by a trough year; the 26.5x forward multiple on $3.19 of expected fiscal-2027 earnings is the usable one, and its price-to-gross-profit fell to 14.91x from 20.14x in May as gross profit grew 62.8%. Everspin has no forward earnings multiple — consensus still shows a 2026 loss of $0.11 — and trades at 5.35x forward sales on 33% expected growth. Allegro, at 42.5x forward earnings, 79.7x trailing enterprise value to EBITDA and a 1.1% free-cash-flow yield, is the one name where the de-rating looks earned.

The setup

Where it stands — Three of four printed record quarters into a sector-wide July selloff; the group has snapped back but sits far below its highs. Would confirm — Rambus product revenue lands in its guided $110–116m range while royalties fall to $69–75m, as management said. Would invalidate — Microchip's gross margin fails to extend past 63.2% next quarter, breaking a five-quarter recovery. Watch next — Everspin's September memory-industry conference demonstration of its CXL proof-of-concept; Rambus reports September-quarter results in late October. Valuation — Rambus 45.7x trailing / 33.4x forward earnings versus 53.7x trailing on 3 May; Microchip 26.5x forward against 117x trailing.