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L4Upstream · 上游 · 상류

Compute 算力 연산

GPUs, AI accelerators, and general-purpose compute silicon for training and inference.

Why AI demand reaches this layer · 需求为什么传导到这里 · 수요가 여기까지 오는 이유

The visible centre of the chain, and the layer most people stop at. It is also the layer that cannot run alone: an accelerator needs memory bandwidth, packaging, interconnect, optics, storage, power and cooling around it. Any one of those lagging and the silicon idles.

整条链最显眼的中心,也是多数人止步的地方。但它恰恰是无法独立工作的一层:加速器周围需要内存带宽、封装、互连、光模块、存储、电力和散热。其中任何一环跟不上,芯片就闲着。

체인의 눈에 띄는 중심이고, 대부분의 사람이 여기서 멈춘다. 혼자 돌아가지도 않는다. 가속기 주변에는 메모리 대역폭, 패키징, 인터커넥트, 광학, 스토리지, 전력, 냉각이 필요하다. 하나라도 늦으면 실리콘은 논다.

Where the chokepoint sits · 瓶颈在哪 · 병목은 어디인가

Design leadership concentrates here, but the near-term ceiling is usually set elsewhere — packaging, HBM supply, or power — rather than by accelerator design.

设计能力高度集中在这一层,但短期的天花板通常由别处决定 —— 封装、HBM 供给或电力 —— 而不是加速器设计本身。

설계 리더십은 여기 모이지만, 단기 천장은 보통 가속기 설계가 아니라 패키징, HBM, 전력 쪽에서 온다.

A structural observation about supplier concentration and lead times — not a view on any security. 这是关于供应商集中度与交期的结构性观察,不是对任何标的的看法. 공급사 집중도와 납기에 대한 구조 관찰이지, 어떤 증권에 대한 의견이 아닙니다.

Companies in this layer · 本层级的公司 · 이 레이어의 기업

Public 13F filings citing these securities · 引用这些标的的公开 13F 申报 · 이들 증권을 인용한 공개 13F

Research context, not a recommendation. These are facts on file with the SEC; the classification that puts a security in this layer is ours, and the filer made no such claim.
供研究参考,不构成任何推荐。以下是已向 SEC 存档的事实;把某个标的归入本层级是我们的分类, 申报人并未作出这样的表述。

  • ARK Investment Managementreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Appaloosa Managementreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Bridgewater Associatesreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Coatue Managementreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Duquesne Family Officereported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Fundstrat Capitalreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-13 · SEC filing
  • Tiger Global Managementreported a position inAMD
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • ARK Investment Managementreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Appaloosa Managementreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Bridgewater Associatesreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Coatue Managementreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Fundstrat Capitalreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-13 · SEC filing
  • Tiger Global Managementreported a position inAVGO
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • ARK Investment Managementreported a position inCBRS
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Coatue Managementreported a position inCBRS
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Tiger Global Managementreported a position inCBRS
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • ARK Investment Managementreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Appaloosa Managementreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Bridgewater Associatesreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Coatue Managementreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
  • Fundstrat Capitalreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-13 · SEC filing
  • Tiger Global Managementreported a position inNVDA
    Form 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing

Rows below are public SEC Form 13F-HR filings, reported by the filing entity for the period shown and filed later — they are never current holdings. Form 13F covers long US equity positions only: it excludes short positions, cash, non-US holdings and most derivatives, and a reported position may have been sold since. Assigning a ticker to a layer is XingAI's classification, not the filer's. Nothing here is a recommendation, and an institution reporting a position is not a reason to take one.

下列条目来自 SEC 公开的 Form 13F-HR 申报,由申报主体就所示期间申报、并在其后提交 —— 它们不是当前持仓。Form 13F 仅覆盖美股多头头寸:不含空头、现金、非美资产和大多数衍生品,且申报的头寸可能已被卖出。把某个标的归入某一层级是 XingAI 的分类,不是申报人的。此处没有任何推荐,机构申报持有某标的也不构成你持有它的理由。

Same track · 同一赛道

Descriptive positioning only. `stance` says whether a company's business is exposed to a layer, never whether to buy it. Layers with no exposure are not recommendations to add any.

Weekly digest: AI-map layer changes and new public 13F filings, each with its source. No score, no grade, no trade signal. Unsubscribe anytime.