Netlist files an HBM ITC case on Micron — Nvidia, Google and Broadcom sit downstream

WIRE · SEMICONDUCTORS · US · Data as at 29 Sep 2026

Netlist today asked the USITC to investigate Micron High Bandwidth Memory and named Nvidia, Broadcom and Google as respondents. The cash print is still a license, not a ban. Samsung already wrote the five-year cheque in August. This complaint opens a second US import gate — on stacks inside the package, not on board-level DDR5 DIMMs.

What happened

On 29 September 2026 Netlist said it had initiated USITC proceedings seeking exclusion and cease-and-desist orders against Micron and “downstream customers” Nvidia, Broadcom and Google (Netlist via PR Newswire, 29 Sep 2026 — company). It asserts U.S. Patent Nos. 12,308,087 and 12,646,537 against at least Micron HBM3E, HBM4 and HBM4E. A complaint is not an investigation, not a finding, and not a ban.

The patents are a stacked-DRAM family — the grants do not say “HBM” on their face. ’537 is a continuation of the ’087 application (Appl. No. 19/212,638), with a terminal disclaimer (USPTO Official Gazette, 2 Jun 2026). Coverage of Micron HBM3E / HBM4 / HBM4E is an allegation.

Micron already ships two named generations. It began volume shipment of HBM4 36GB 12-high in calendar Q1 2026, designed for NVIDIA Vera Rubin, at over 11 Gb/s and greater than 2.8 TB/s per stack (Micron IR, 16 Mar 2026 — company). Product pages still list HBM3E (more than 1.2 TB/s) and HBM4 — SKUs, not proof of infringement. The release also names HBM4E; Micron’s 16 March print showed a 48GB 16-high HBM4 sample, not an HBM4E volume date.

The same release restates the DDR5 case: complaint 11 August 2026 against Micron, Super Micro, HPE and Lenovo; instituted as 337-TA-1523 on 23 September 2026. That is the board-DIMM gate — our 26 September Wire. Today’s caption is two later patents, HBM generations, and GPU / ASIC / TPU names.

Why cash cares

Accelerators need two memory clocks: HBM beside the GPU inside the package, and DDR5 on the board. The Stack stuck step has been CoWoS-class packaging plus HBM attach (HBM, explained, HBM vs DDR5). 337-TA-1523 opened the board-import gate. Today’s complaint aims the same statute at the package clock.

Who gets paid if the case later bites is the patent owner, or the memory maker that already holds a license. Who waits is the unlicensed importer of accused stacks — and, if “products containing” those stacks later enter the notice, the named downstream designers. Nvidia, Broadcom and Google are on the caption as downstream customers, not because a GPU or TPU has been found to infringe.

The cash print that already exists is Samsung’s August 8-K. Five-year cross-license effective 31 July 2026: upfront US$239 million (~US$200 million net of Korean withholding) plus quarterly fees of up to US$32.9 million (up to ~US$27.5 million net) for twenty quarters through 2Q 2031, formula-based, with refund rights (Netlist Form 8-K, 5 Aug 2026 — company filing). The 5 August release said the licensed portfolio includes server DIMM and High Bandwidth Memory. Same 8-K: an ITC Cooperation Agreement — Samsung produces information for Netlist’s future ITC actions against third parties.

Our arithmetic (ceilings, not collections). Gross if every quarter hits “up to”: $239m + (20 × $32.9m) = $897 million. Net: $200m + (20 × $27.5m) = $750 million. Maxima on a formula — not Micron’s bill.

Why downstream names sit on an HBM complaint

Section 337 is an unfair-import statute. The primary remedy is an exclusion order that directs Customs to stop infringing imports, plus cease-and-desist orders against named importers (USITC, About Section 337). Institution — if it happens — is by Federal Register notice that defines the accused products (19 CFR § 210.10(b)(1)). The Commission decides whether to institute within 30 days after the complaint is filed; if it does not, the complaint is dismissed (19 CFR § 210.10(a)(1), (c)).

A DDR5 DIMM case names the module and the servers that contain it. An HBM case that also names Nvidia, Broadcom and Google is aimed at stacks beside the compute die, not in a socket. If the Commission later writes “products containing” those stacks into a notice, the import gate can reach finished accelerators, not only bare cubes. That is the mechanism — not a finding. No investigation number appears in the 29 September release.

Two clocks. Legal: filing, a 30-day institution vote, then — only if instituted — hearing, Commission review, and a 60-day USTR window after any remedial order. Cash: licenses that settle the import risk before that finishes. Samsung’s 8-K already printed the cash clock. Today’s release starts a legal clock against Micron and three downstream designers. Nothing in it bans a stack tomorrow.

The second-order read

Who gets paid. Samsung already wrote the five-year cheque. Netlist gets paid again if Micron or a named downstream name buys a seat, or if an order later blocks unlicensed articles. Who pays. Micron first. Nvidia, Broadcom and Google pay only if they are later found to import accused articles without a license — a chain the Commission has not opened. Upstream / downstream: cubes into CoWoS-class packages; packages into US halls. See Who makes HBM.

By clock. The package clock is still CoWoS-L and HBM attach. The board-import clock is 337-TA-1523. Today’s filing is a second legal clock on package memory, not a new attach slot. Our read: the stuck step is who holds a US license to import the stacks beside the GPU.

Two cautions

A complaint is not institution. Do not treat the 29 September release as 337-TA-anything, as an import ban, or as a change in HBM allocation. The Commission has 30 days to decide whether to open a case (19 CFR § 210.10). Mixing this caption with 337-TA-1523 invents a single “Micron memory ban.” 1523 is DDR5 DIMMs and three server OEMs; this release is two HBM patents and three downstream designers.

The Samsung dollars are August, “up to,” formula-based, and subject to refund rights. Our $897 million / $750 million figures are ceiling arithmetic, not Micron’s invoice.

What would change the view

• A Federal Register notice instituting an investigation that names accused HBM generations and “products containing” them — or a dismissal under 19 CFR § 210.10(c).
• A Micron or downstream license that prints cash on the same order as Samsung’s 8-K.
• After institution: no-violation ID, or a limited exclusion order that survives the 60-day USTR window.

What to watch

• Within 30 days of filing: whether the Commission institutes and publishes a notice (19 CFR § 210.10).
• The accused-product sentence in any notice — stacks only, or products containing them.
• 30 September 2026: Micron’s fiscal fourth-quarter call, 2:30 p.m. Mountain (Micron IR, 26 Aug 2026 — company).
• Any 8-K that puts a dollar figure on an HBM license.
• 337-TA-1523’s target date — a separate board clock.

Read: Semiconductors — The Stack · HBM, explained

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Sources: Netlist via PR Newswire, 29 Sep 2026 — company; U.S. Patent No. 12,308,087 — USPTO via Google Patents; U.S. Patent No. 12,646,537 — USPTO Official Gazette, 2 Jun 2026; Netlist Form 8-K, 5 Aug 2026 — company filing; Netlist via PR Newswire, 5 Aug 2026 — company; Micron IR, 16 Mar 2026 — company; Micron HBM3E; Micron HBM4; USITC, About Section 337; 19 CFR § 210.10; Micron IR, 26 Aug 2026 — company (30 Sep call). Not investment advice.