The Largest Colocation Data Center Providers Ranked: Equinix, Digital Realty, NTT and More

The largest colocation data center providers are the landlords of the internet: they build the halls, secure the power and sell rack space or whole buildings to enterprises, cloud platforms and AI companies. This ranking compares the leaders by revenue, capacity and footprint using results published through October 2026. It covers listed REITs such as Equinix, Digital Realty and Iron Mountain, global telecom-backed groups like NTT DATA, Asian specialists such as GDS, and the private-equity-owned wholesale platforms. It is part of the Kurums Data Center Economy hub. Read it alongside our explainer on data center business models and our profile of private equity’s data center empires.

What is a colocation data center provider?

A colocation provider owns or leases data center buildings and rents power, cooling, space and connectivity to customers who bring their own servers. Retail colocation sells cabinets and cross-connects. Wholesale colocation leases large blocks of megawatts, often whole buildings, to hyperscalers.

The distinction matters for rankings. Retail-heavy operators like Equinix earn higher revenue per megawatt because they sell interconnection, the cables that link one customer’s equipment to another’s inside the same facility, plus many small contracts. Wholesale developers such as QTS, Vantage or Aligned may control more megawatts but earn less per unit, because they lease huge blocks under long contracts to a few tenants. Digital Realty sits between the two, with both a hyperscale business and a growing “0–1 MW” retail and interconnection segment.

Synergy Research Group estimates that non-hyperscale colocation accounted for about 20% of worldwide data center capacity at the end of 2025. Hyperscalers held 48% and enterprise-owned sites 32%. Nearly 40% of hyperscale capacity is itself leased, much of it from wholesale colocation firms, so the colocation industry’s economic footprint is bigger than its 20% headline share. For the full map of how these models make money, see our business models guide.

Which colocation providers are the largest in 2026?

By revenue, Equinix is first, Digital Realty second and NTT DATA’s data center division third among global players outside China. By capacity, the private wholesale platforms QTS, CyrusOne, Vantage and Aligned now sit close behind, and Chinese operators such as China Telecom and GDS lead inside China.

There is no single official ranking, because operators report different metrics. Some report revenue, some IT megawatts and some square metres. The table below combines the latest reported financials with two independent capacity estimates. ABI Research measured active US IT load in 2025. Lambda Finance compiled global operating capacity as of Q1 2026 from filings, Synergy and Dell’Oro data. Treat the capacity columns as estimates: they differ in method, and private companies disclose little.

Source: Equinix Q3 2026 release; Digital Realty Q3 2026 supplemental; Iron Mountain Q2 2026 release; ABI Research, Top 25 Largest Data Center Companies in the U.S. (Feb 2026); Lambda Finance, Largest Datacenter Operators by Capacity 2026 (May 2026). Capacity figures are third-party estimates.

Notice how differently the two estimates treat some firms. Aligned, for example, has much more capacity under development than in operation. Its new owners valued it on a 6.4 GW pipeline when they bought it. ABI’s US-only figures also miss the large international portfolios of Equinix, Digital Realty and NTT, which explains the gap between columns.

How big is Equinix and how does it make money?

Equinix is the world’s largest colocation company by revenue. It reported Q3 2026 revenue of $2.571 billion, up 11%, and raised its full-year 2026 guidance to $10.325–10.365 billion. It operates 282 data centers across more than 70 metros on six continents.

Equinix’s model rests on retail colocation and interconnection. Customers place equipment in its facilities mainly to connect directly to carriers, cloud on-ramps, financial exchanges and each other. That ecosystem makes Equinix’s revenue sticky. In Q3 2026 the company posted record annualised gross bookings of $533 million, up 35% year over year. Adjusted EBITDA rose 15% to $1.321 billion, and AFFO rose 20% to $1.156 billion.

Equinix also has a large wholesale arm, xScale, which builds hyperscale facilities through joint ventures with financial partners, and it is expanding its owned footprint. In September 2026 Equinix and Canada’s CPP Investments completed the roughly $4.0 billion purchase of Nordic operator atNorth from Partners Group. Total 2026 capital expenditure is guided at $5–6 billion. Recurring maintenance capex is only about 3% of revenue, which shows how much of the spending goes to growth.

Equinix also said it expects to deliver nearly 40% more cabinets in 2026 than it originally planned, according to 24/7 Wall St.’s summary of the Q3 call. Its total debt principal was $25.2 billion at quarter end.

How does Digital Realty compare with Equinix?

Digital Realty is the second-largest listed colocation provider. It guides to $7.05–7.125 billion of 2026 revenue, operates 300+ data centers in more than 55 metros, and reports about 13 GW of total IT capacity, including about 10 GW of future development potential.

Digital Realty leans more towards wholesale and hyperscale leasing than Equinix does, though it is growing its smaller-deal business fast. In Q3 2026 total revenue was about $1.34 billion, up roughly 9%. Bookings hit $626.6 million at Digital Realty’s share ($855 million at 100% share), up 80% year over year. That included a record $474 million of leases above 1 MW and a record $152 million of 0–1 MW and interconnection bookings. Its backlog of signed-but-not-commenced leases reached a record $2.5 billion at 100% share.

The capacity numbers show where Digital Realty’s growth will come from. Of its roughly 13 GW, only about 3 GW is in place, about 1.5 GW is under construction, and the rest is land and power held for future development. In June 2026 it paid a $7.8 billion gross asset value to buy Blackstone’s stakes in three Northern Virginia sites totalling 288 MW, and it bought about 1,440 acres near Kansas City. Digital Realty increasingly funds hyperscale projects through private funds, and its fee income more than doubled year over year in Q3 2026.

Where do NTT DATA and the other global players rank?

NTT DATA describes itself as the world’s third-largest data center provider excluding China, based on Structure Research. It reported about 1.5 GW of capacity at the end of March 2025 and listed a Singapore REIT, NTT DC REIT, in July 2025.

NTT’s footprint spans the Americas, EMEA, India and Asia-Pacific, with a particularly strong position in Japan, India and the United States. The NTT DC REIT, which listed on the Singapore Exchange in July 2025, started with six assets in the United States, Austria and Singapore totalling about 90 MW. It gives NTT a way to recycle capital from stabilised sites into new builds. That approach is increasingly popular across the sector.

Other global names include KDDI’s Telehouse and Japan’s other telecom-backed operators, Europe’s Data4 and Global Switch, and the Asia-Pacific specialists. In Asia, KKR and Singtel completed the buyout of the remaining 82% of ST Telemedia Global Data Centres in September 2026 for S$6.6 billion, implying about S$13.8 billion of enterprise value. Blackstone-owned AirTrunk has more than 3 GW of operating and planned capacity across Australia, Japan, Singapore, Malaysia, Hong Kong and India. We cover the regional picture in our Asia-Pacific investment guide.

Who are the largest privately owned colocation platforms?

The largest private platforms are QTS (Blackstone), CyrusOne (KKR and GIP), Vantage (DigitalBridge, Silver Lake and partners), Aligned (now AIP, BlackRock’s GIP and MGX), STACK, Switch, EdgeConneX (EQT) and Compass. Most focus on wholesale hyperscale and AI leases.

These companies grew through very large private equity deals. Blackstone agreed to buy QTS for about $10 billion in 2021, and KKR and GIP bought CyrusOne for $15 billion in 2022. DigitalBridge and IFM took Switch private for $11 billion. Vantage raised a $9.2 billion equity round led by DigitalBridge and Silver Lake in 2024. The biggest of all closed in July 2026, when the AI Infrastructure Partnership, BlackRock’s GIP and MGX completed the purchase of Aligned from Macquarie at an enterprise value of about $40 billion, for a platform with about 6.4 GW of capacity.

In the US, ABI Research ranked QTS as the second-largest colocation operator by active IT load in 2025, at 811 MW. CyrusOne followed at 674 MW, Aligned at 548 MW and DataBank at 544 MW. These firms lease mostly to the hyperscalers profiled in our hyperscaler comparison, which is why their growth tracks Big Tech capex so closely. Ownership keeps changing too: SoftBank completed its roughly $4 billion acquisition of DigitalBridge, the manager behind Vantage, Switch and DataBank, in September 2026.

Which colocation providers lead in China and emerging Asia?

Inside China the market is led by telecom operators such as China Telecom and by specialists like GDS, VNET and Chindata. GDS raised its 2026 revenue guidance to RMB12.7–13.0 billion and has about 785,000 square metres of committed and pre-committed area.

Chinese operators matter in global rankings: in its 2022 analysis Synergy Research Group estimated that Chinese companies held about 13% of global colocation revenue. GDS reported Q2 2026 net revenue of RMB3.09 billion, up 6.5%, with 79.2% utilisation. It guides 2026 capex at RMB9–10 billion. Its full-year 2025 revenue was RMB11.43 billion from about 668,000 square metres in service.

GDS also spun out its international business as DayOne, which is building across Johor, Singapore, Indonesia, Thailand and Japan. DayOne completed a $4.5 billion Series C in June 2026, and GDS sold about $385 million of its DayOne shares earlier in the year. Chindata, taken private by Bain Capital in 2023, focuses on hyperscale campuses for ByteDance and other Chinese platforms. For more on the China market and export controls, see our China data center analysis.

How is Iron Mountain building a data center business?

Iron Mountain, best known for document storage, has become a significant data center operator. Its data center revenue grew 39% to $263 million in Q2 2026, from 529 MW of operating capacity across 31 sites and about 1.4 GW of developable capacity.

The company has used its real estate and enterprise customer relationships to move into hyperscale leasing. By July 2026 it had signed 110 MW of new data center leases for the year, including 51 MW in Mumbai and 25 MW in London. Another 75 MW was signed after the quarter closed. It expects about 325 MW to become available to lease over the next 24 months. Management said its backlog supports an additional $370 million of growth beyond 2026.

Iron Mountain shows a broader trend: companies with land, power and capital access are entering the colocation business from other sectors. Telecom tower owner American Tower owns CoreSite. Realty Income formed a hyperscale joint venture in 2026 seeded with more than $6 billion of assets. Bitcoin miners such as Hut 8 and Cipher Mining appear in ABI’s top-25 US list as they convert power-rich sites to AI hosting.

What trends will reshape the colocation rankings by 2030?

Three trends will reshape the league table: AI-driven demand for very large, high-density campuses; consolidation through mega-deals; and capital recycling through REITs, private funds and securitisation. Power access will decide who grows fastest.

AI favours operators that can deliver hundreds of megawatts with liquid cooling on a short timeline, which is why wholesale platforms like Aligned and Vantage attracted record valuations. Retail operators are responding: Equinix says it has more than 270 AI-ready sites. Synergy expects hyperscale capacity to roughly triple by 2031. Colocation keeps growing in absolute terms even as its share of the total slips.

Consolidation will continue. Beyond Aligned, 2026 saw the STT GDC buyout, the atNorth sale, SoftBank’s DigitalBridge takeover and Digital Realty’s Northern Virginia stake purchase. Our guide to the biggest data center M&A deals tracks valuations. On the capital side, operators are funding growth through asset-backed securities, green loans and listed vehicles such as NTT DC REIT. Our article on how data centers are financed explains these tools.

Frequently Asked Questions