Digital Realty and Microsoft trail at 18 and 15 sites, respectively; where AWS clusters, second-wave demand follows within 18 months
## Tenant Footprint as Demand Signal
Amazon Web Services is the most-tracked data-center tenant in DC Hub's live facility database, present at **34 distinct facilities** representing approximately **1,920 MW of leased capacity**. Digital Realty occupies 18 sites, Microsoft 15. This per-occupier facility count and MW footprint is not published in any analyst PDF, directory, or static report—yet it is the cleanest forward indicator of where grid headroom and available land will tighten next.
## What It Means for Site Selection
Hyperscaler concentration predicts the next wave of constraint. Where AWS commits multi-site capacity, competing builds follow within 12–18 months, compressing power headroom and repricing land. Analysts modeling 2027–2028 capex windows should price the comparable markets now—before the DCPI excess score drops and interconnection timelines extend. The lag between AWS's first lease and a market's shift from 70+ excess to sub-60 has averaged 14 months across the last three years of tracked expansions.
## The Second-Order Implication
This tenant-level view exposes a different kind of scarcity: not MW under construction, but **committed occupancy** that locks future capacity before it is marketed. A market can score 75 on excess power today and still face a two-year wait if hyperscale pre-leases absorb the next three phases. The tenant tracker lets capacity planners see the queue *behind* the queue—the demand that will clear available supply before public RFPs close.
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**Source:** DC Hub Tenant Tracker (https://dchub.cloud/research?series=tenant), live facility and occupier data across 20,100+ global sites, updated daily.
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