Networking
Interconnect, switching, and high-speed data-movement silicon linking compute clusters.
Stack position
Where Networking sits in the AI stack
L4 · Custom Silicon
ASICs and custom accelerator designs (in-house or merchant silicon) for specific AI workloads.
L5 · Networking
Interconnect, switching, and high-speed data-movement silicon linking compute clusters.
L5 · Optical
Optical transceivers and fiber connectivity for datacenter-scale networking.
L6 · AI Server
GPU servers, racks, and storage systems integrating accelerators into deployable units.
Icons mark layer roles — not company logos. Position only; not a price chart.
Why this layer matters
A frontier training run spans tens of thousands of accelerators that must behave as one machine. That produces a distinct hierarchy: links inside the package, scale-up inside the rack, scale-out between racks, plus the switches and NICs that carry it. This is a first-class industry, not a footnote under semiconductors.
What is the bottleneck?
Cluster scale is increasingly limited by what the fabric can sustain rather than by how many accelerators can be bought.
A structural observation about supplier concentration and lead times — not a view on any security.
Who sits in this layer?
Company
MRVLPrimary business sits hereData-center interconnect and networking silicon.
Company
ANETPrimary business sits hereDatacenter switching systems used in large AI cluster fabrics.
Company
AVGOPrimary business sits hereMerchant switch silicon and datacenter networking components.
Company
ALABPrimary business sits hereConnectivity semiconductors for accelerator and memory interconnect.
Company
CRDOPrimary business sits hereHigh-speed connectivity products for datacenter interconnect.
Company
CSCOAdjacent / mixedEnterprise and service-provider networking broadly; AI datacenter fabric is one segment.
Company
APHPrimary business sits hereHigh-speed interconnect, cable assemblies, and connectors for datacenter systems.
Public 13F filings citing these securities
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.
- ARK Investment Managementreported a position inAVGOForm 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
- Appaloosa Managementreported a position inAVGOForm 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
- Bridgewater Associatesreported a position inAVGOForm 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
- Coatue Managementreported a position inAVGOForm 13F-HR for the period ending 2026-06-30, filed 2026-08-14 · SEC filing
- Fundstrat Capitalreported a position inAVGOForm 13F-HR for the period ending 2026-06-30, filed 2026-08-13 · SEC filing
- Tiger Global Managementreported a position inAVGOForm 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.
Coverage boundary
Coverage boundary: US-listed tickers or ADRs only (same rule as TSM / ASML). Important suppliers without a US listing are omitted even when they matter to the stack. That is a coverage rule, not a quality ranking.
No hand-listed notable omissions for this layer yet. The US-list / ADR rule still applies.
Checked 2026-10-09. Not exhaustive.
Same track
Descriptive positioning only. The positioning label 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.