Layer 9 — Building shell, site & construction

Position in the die→grid hierarchy: outside the fence.

The building and the site: developers, operators and REITs, the hyperscalers and labs that fill them, the architects, contractors and MEP trades that build them, structure and envelope materials, site utilities, security, and commissioning.

Parts in this layer

• 9.01 Data center developers, operators & REITs · 69 companies
  The companies that own, develop, and operate the physical data center buildings AI workloads run in, from public REITs and colocation operators to private developers and bitcoin miners that have pivoted to AI hosting.
• 9.02 Hyperscalers, neoclouds & model labs (the tenants and owners) · 35 companies
  The hyperscalers, neoclouds, and AI labs that occupy data center capacity as tenants or owner-operators, and whose capital spending ultimately drives demand for every layer below this one.
• 9.03 Architecture, engineering & MEP design · 30 companies
  Architecture and engineering firms that design a data center's building envelope and its mechanical, electrical, and plumbing (MEP) systems before construction begins.
• 9.04 General contractors & design-build · 60 companies
  General contractors and design-build firms that construct the data center shell and coordinate the trade subcontractors once architecture and MEP design (9.03) are complete.
• 9.05 MEP & electrical contractors (self-perform) · 25 companies
  Self-performing MEP and electrical contractors who install the power distribution, cooling piping, and electrical systems specified by design (9.03) under the general contractor's coordination (9.04).
• 9.06 Structure, steel, precast, envelope, site equipment · 45 companies
  The raw structural and envelope inputs to a data center building — steel, precast concrete, cement and aggregates, wall and roof systems, raised floor, doors, and the heavy site equipment used to build it.
• 9.07 Prefab / modular data centers & power/cooling skids · 19 companies
  Factory-built modular data center units and prefabricated power and cooling skids that are assembled off-site and installed as complete, pre-integrated blocks.
• 9.08 Site utilities, water & fiber entrance · 25 companies
  The utility connections a data center needs beyond electrical power — water supply and wastewater handling, on-site water storage and reuse, and the fiber and carrier entrances that connect it to the network.
• 9.09 Physical security & access · 22 companies
  Physical access control, video surveillance, perimeter detection, and guarding systems that secure the facility and its data halls.
• 9.10 Testing, commissioning & certification · 21 companies
  Independent commissioning agents, load banks, and test equipment that verify a completed data center's power and cooling systems perform to specification before it goes live, along with the certification bodies that set the standards they test against.

Public plays in this layer

Listed companies with the most part placements in layer 9. Placement count is breadth, not revenue exposure.