Top 10: Colocation Providers

Colocation has become the backbone of the new AI‑driven, cloud‑first digital economy, with operators racing to deliver high‑density capacity, rich interconnection and credible sustainability at global scale. 

The providers in this Top 10 are pushing the model forward through hyperscale‑ready campuses, native cloud on‑ramps and advanced cooling that can accommodate GPU‑heavy workloads without sacrificing efficiency.

The investments and execution by these industry leaders are reshaping how enterprises architect hybrid IT, enabling latency‑sensitive, regulated and AI workloads to run in highly connected neutral hubs rather than on isolated legacy estates.

10) DayOne

• Founded: 2022
• CEO: Jamie Khoo
• Standout components: Lahti 128MW Finland campus; free‑cooling design; heat‑reuse and district heating integration

DayOne is an emerging colocation and hyperscale developer using greenfield European builds to showcase a sustainability‑first philosophy. 

Its planned €1.2bn (US$1.39bn) Lahti campus in Finland will transform a former industrial site into up to 128MW of IT load, leveraging free cooling and eliminating freshwater use. 

By actively exploring waste‑heat reuse with Lahti’s district heating system and securing a power agreement with Lahti Energy, DayOne illustrates how next‑generation campuses can support AI‑grade density while strengthening local grids and community infrastructure.

9) Iron Mountain

• Founded: 1951
• CEO: William Meaney
• Standout components: 400+ MW installed capacity; global pipeline for AI workloads; security‑led, sustainable colocation portfolio

Iron Mountain has evolved from a records management firm into a serious global colocation force, with around 424MW of capacity in 2025 and 96% of it leased, supported by a substantial pipeline of new builds. 

Its data centre business now spans 30+ locations, offering secure, compliant colocation optimised for high‑density and AI use cases, underpinned by the brand’s long reputation in information protection. 

With hundreds of megawatts under construction and earmarked for future development, Iron Mountain is positioning its campuses as long‑term, low‑risk homes for mission‑critical and GPU‑rich workloads.

8) Csquare

• Founded: 2024 (via merger)
• CEO: Spencer Mullee
• Standout components: Focus on interconnection‑rich colocation; enabling cloud‑smart, hybrid architectures at the edge

Csquare (formerly Centersquare) sits in the fast‑growing segment of colocation tailored for hybrid cloud and edge connectivity, rather than pure commodity space and power. 

Its trajectory mirrors findings from CoreSite’s 2025 State of the Data Center report, which highlights how enterprises are shifting from cloud‑only to “cloud‑smart” strategies that combine public cloud, on‑premises and colocation to run workloads where they perform best. 

By emphasising rich interconnection and partnerships, Csquare helps customers bridge this gap, placing compute close to users and clouds in increasingly distributed architectures.

7) Telehouse

• Founded: 1988
• CEO: Kenkichi Honda (MD of Telehouse Europe)
• Standout components: London Docklands “most connected” campus; £275m (US$370m) West Two build; AI‑ready air‑and‑liquid cooling

Telehouse remains one of Europe’s connectivity powerhouses, anchored by its London Docklands campus which is widely described as the most connected data centre campus in Europe. 

Its new £275m (US$370m) Telehouse West Two facility, now under construction, will extend that status with a purpose‑built, nine‑storey site that combines air and liquid cooling to support high‑density AI and HPC deployments. 

With two meet‑me rooms, dedicated secure risers and operations powered by 100% renewable energy, the campus underscores how Telehouse is aligning interconnection leadership with modern sustainability and density requirements.

6) CoreSite

• Founded: 2001 (now part of American Tower)
• CEO: Juan Font
• Standout components: Native cloud on‑ramps; Gartner‑recognised colocation; interconnection‑rich, high‑density campuses

CoreSite has carved out a differentiated role in North American colocation by pairing retail and wholesale space with deep cloud interconnection. 

It is one of the few providers highlighted in 2025 research for offering native connections to multiple cloud providers directly from its facilities, helping customers close the “interconnection gap” that slows digital transformation. 

Inclusion in the 2025 Gartner Market Guide for Data Center Colocation and its latest State of the Data Center report underline CoreSite’s influence in shaping cloud‑smart, AI‑capable architectures.

5) QTS

• Founded: 2003
• CEO: David Robey and Tag Greason (Co-CEOs)
• Standout components: Large US hyperscale campuses; multibillion‑dollar expansion; strong community and ESG commitments

QTS has emerged as a hyperscale‑centric colocation giant, with more than 75 data centres in operation or development across the US and northern Netherlands supporting cloud, ecommerce, social media and AI workloads. 

Backed by Blackstone, it is deploying hundreds of millions of dollars into major campuses in North Texas and beyond, including two large new facilities in Dallas County and the expansion of its Fort Worth site, all targeting completion by 2027. 

Its planned multi-billion‑dollar campus in Dane County, Wisconsin, is paired with a US$50m community commitment, signalling how QTS links regional economic impact with sustainable digital infrastructure.

4) CyrusOne

• Founded: 2000
• CEO: Eric Schwartz
• Standout components: AI‑oriented Intelliscale facilities; manufacturing‑driven build model; 50+ data centres across US, Europe and Japan 

CyrusOne has repositioned itself as an AI‑ready colocation leader, combining global reach with a productised, manufacturing‑style approach to data centre delivery. 

It now operates more than 50+ facilities across the US, Europe and Japan, focused on hyperscale and large enterprise customers that need rapid, repeatable capacity. 

Its Intelliscale family is designed for AI‑heavy workloads, pairing high density with robust availability. 

By refining standardised construction processes to compress timelines and enhance quality, CyrusOne delivers large‑scale, sustainable capacity at a speed that aligns tightly with hyperscaler growth cycles.

3) NTT Global Data Centers

• Founded: 2018
• CEO: Douglas Adams
• Standout components: One of the world's largest data centre platforms; US$10bn expansion plan to FY27; 370+ MW new IT capacity added in past year

NTT Global Data Centers has become a cornerstone of the global colocation market and is now the world’s third‑largest provider with facilities in more than 20 countries and a US$10bn expansion programme running through to 2027. 

Over the last year it has opened 10 new sites across North America, EMEA and APAC, adding more than 370MW of IT capacity to support both hyperscale and enterprise customers. 

Recent hyperscale agreements totalling more than 130MW across campuses in Chicago, Dallas, Phoenix and Virginia show how NTT is tightly aligned with AI and cloud demand, while its Climate Pledge and SBTi‑approved net‑zero targets highlight a serious sustainability strategy.

2) Digital Realty

• Founded: 2004
• CEO: Andy Power
• Standout components: 300+ data centres in 50+ metros; PlatformDIGITAL global fabric; IDC 2025 colocation leadership recognition

Digital Realty has built one of the world’s largest data centre platforms, with more than 300 facilities across over 50 metropolitan areas serving 5,000+ customers and sustaining more than a decade of 99.999% uptime. 

Its PlatformDIGITAL architecture underpins colocation, interconnection and high‑density AI environments from single racks to private suites, enabling enterprises and service providers to deploy infrastructure close to clouds, partners and end‑users. 

Recognition as a Leader in the IDC MarketScape: Worldwide Datacenter Colocation Services 2025 assessment validates its role in shaping global colocation standards, while its high‑density and green‑credentialled offerings speak directly to customers balancing AI power demands with ESG obligations.
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Digital Realty is also investing heavily in AI‑capable designs, including advanced cooling and power configurations to support GPU‑intensive workloads without sacrificing reliability. 

Its data‑exchange‑centric positioning turns facilities into hubs where data, clouds and networks converge, allowing customers to avoid lock‑in and optimise where workloads run. 

This combination of reach, resiliency and ecosystem depth makes Digital Realty a default strategic partner for organisations rationalising sprawling infrastructure into a consistent, global colocation footprint.

1) Equinix

• Founded: 1998
• CEO: Adaire Fox-Martin
• Standout components: ~270+ data centres worldwide; 10,000+ customers; 59 active build projects in 34 cities across 25 countries in 2025

Equinix tops the colocation landscape as the sector’s most influential neutral interconnection platform, operating around 270 data centres globally and serving more than 10,000 customers. 

In 2025 it reported that 59 data centre construction projects were underway across 34 cities in 25 countries, signalling an ambition to add as much capacity in the next five years as in its first 27. This expansion directly tracks demand for AI‑ready, cloud‑dense colocation. 

Equinix’s ecosystems underpin everything from financial trading – with about 72% of the world’s trading platforms hosted in its facilities – to digital media and enterprise multi‑cloud, making its IBX sites critical pieces of national and sector infrastructure.
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Under CEO Adaire Fox‑Martin, Equinix has articulated a strategy built around three principles: “grow together”, “solve smarter” and “serve better”, emphasising differentiated connectivity, architectural simplicity and customer experience. 

The firm’s leadership in science‑based climate targets, including a 2030 carbon‑neutral goal and a 2040 net‑zero ambition, aims to reconcile surging AI and cloud power requirements with local community expectations and regulatory scrutiny. 

With unparalleled carrier‑neutral density, rich interconnection and a sustained build‑out pipeline, Equinix sets the benchmark for what modern colocation – and its role in the wider digital economy – now looks like.