STACK Infrastructure
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STACK Infrastructure is a wholesale and hyperscale data center developer that sells physical capacity to hyperscalers and large enterprises under three branded products: HYPERSTACK (large build-to-suit and hyperscale campuses), READYSTACK (immediately available wholesale colocation and private data suites), and POWERSTACK (powered shell). As of 2025-2026 the company operates data center campuses across roughly twenty markets on three continents, including major North American markets like Northern Virginia (its largest hub, at roughly 2,400MW across seven sites), Dallas-Fort Worth, Phoenix, Portland/Hillsboro, Chicago, Atlanta, Silicon Valley, plus Toronto and Calgary in Canada; European markets including Frankfurt, Zurich, Geneva, Milan, Oslo, Stockholm and Copenhagen; and Asia-Pacific markets including Tokyo, Osaka, Melbourne, Sydney and Johor Bahru, Malaysia. STACK was formed in 2019 from the merger of former Infomart and T5 data center assets, backed initially by IPI Partners, and has since been owned by Blue Owl Digital (since October 2024). A notable recent move is STACK’s 2025-2026 sale of parts of its European enterprise colocation business to Apollo, as the company repositions STACK EMEA to focus primarily on hyperscale clients rather than multi-tenant colocation. STACK builds and operates its own campuses (rather than purely reselling third-party space), with several facilities featuring dedicated on-site substations and closed-loop or high-density cooling designed for AI/ML workloads.
STACK Infrastructure has a confirmed data center presence at the following locations:
FACILITY OPERATOR
STACK Infrastructure Data Center Locations
- Sydney, New South Wales, Australia PENDING REVIEW
Per STACK Infrastructure's own site: STACK's locations page lists 1 Sydney site totaling 360MW of capacity. - Melbourne, Victoria, Australia PENDING REVIEW
Melbourne was STACK's first APAC facility, opened in August 2023 as a 36MW building on a scalable 72MW campus with a dedicated 105MW onsite substation. - Calgary, Alberta, Canada PENDING REVIEW
- Toronto, Ontario, Canada PENDING REVIEW
STACK's 56MW Toronto campus, spanning 19 acres and located six miles from downtown Toronto, was the company's first international expansion, announced in 2021 in partnership with First Gulf. - Copenhagen, Denmark PENDING REVIEW
Per STACK Infrastructure's own site: STACK's EMEA locations page lists 1 Copenhagen site totaling 72MW of capacity. - Frankfurt, Hesse, Germany PENDING REVIEW
STACK's Frankfurt campus is an 80MW development on a 17-acre site, one of its larger EMEA hyperscale sites. - Milan, Italy PENDING REVIEW
Milan is STACK's largest EMEA market by site count and capacity, with 9 sites totaling 299MW per the company's own locations page. - Osaka, Japan PENDING REVIEW
STACK's Osaka campus, developed in a joint venture with ESR Group in the eastern suburb of Keihanna, is planned as 72MW across three buildings, with the first building beginning construction in Q4 2023. - Tokyo, Japan PENDING REVIEW
STACK's Tokyo-area campus (developed near Inzai) is a 36MW facility featuring 18MW under construction and 18MW of expansion capacity. - Johor Bahru, Malaysia PENDING REVIEW
STACK announced a 220MW data center campus in Johor Bahru in January 2025, positioning it within Southeast Asia's fastest-growing data center market. - Oslo, Norway OSL02 / OSL03 / OSL04 PENDING REVIEW
STACK uses biofuel in the backup generators at its newer Oslo data center, and its OSL02 campus in the Rosenholm suburb runs on 100% renewable energy. - Stockholm, Sweden PENDING REVIEW
STACK's Stockholm campus is a 30MW development with 18MW under active construction/expansion. - Geneva, Switzerland PENDING REVIEW
Per STACK Infrastructure's own site: STACK's locations page lists 3 Geneva sites totaling 42MW of capacity. - Zurich, Switzerland PENDING REVIEW
Per STACK Infrastructure's own site: STACK's locations page lists 3 Zurich sites totaling 76MW, explicitly excluded from the 2025-2026 European colocation sale to Apollo. - Phoenix, Arizona, USA PENDING REVIEW
STACK's planned Central Phoenix campus is a five-building, 250MW development served by a dedicated on-site substation. - Santa Clara, California, USA PENDING REVIEW
Per STACK Infrastructure's own site: STACK's locations page lists 2 Silicon Valley sites totaling 200MW of capacity. - Atlanta, Georgia, USA PENDING REVIEW
Per STACK Infrastructure's own site: STACK's own locations page states its Atlanta market comprises 2 sites totaling 180MW of capacity. - Elk Grove Village / Chicago, Illinois, USA AI DATA CENTER PENDING REVIEW
STACK's 2025-announced Chicago-area facility is a two-story, 263,000 sq. ft., 36MW data center built less than a mile from the existing CHI01 campus near O'Hare, powered by a local ComEd substation. - New Albany, Ohio, USA AI DATA CENTER PENDING REVIEW
STACK's New Albany campus is a roughly 58-60MW facility expanding with 51MW of power-secured, turnkey high-density capacity due to deliver in Q1 2028. - Hillsboro (Portland), Oregon, USA PENDING REVIEW
STACK's flagship Portland-area campus spans 55 acres and offers direct low-latency connectivity to trans-Pacific subsea cable landings, growing toward 200MW+ with future expansion planned through 2029. - Plano, Texas, USA DFW01 / DFW02 CARRIER-NEUTRAL PENDING REVIEW
STACK's two Dallas-Fort Worth data centers, DFW01 and DFW02, total 32MW and nearly 400,000 sq. ft. in Plano and are already served by 13 select carriers plus a dedicated fiber network partner. - Ashburn, Virginia, USA PENDING REVIEW
STACK's Ashburn campus in Loudoun County is powered from an on-site substation and is designated to eventually run on 100% renewable power.
By Continent
AI Data Centers
STACK doesn't brand itself as an AI-only ('neocloud') provider, but several of its campuses show specific engineering aimed at high-density AI/ML workloads. Its Elk Grove Village facility near Chicago, opened in 2025, uses a closed-loop water cooling system explicitly designed to handle high-density AI/ML loads, and STACK's New Albany, Ohio campus is adding 51MW of power-secured, turnkey high-density capacity for delivery in Q1 2028. Company-wide, STACK markets its campuses as offering 'flexible, AI/ML density solutions,' reflecting a broader push to retrofit and design hyperscale capacity for GPU-class power and cooling demands.
- Elk Grove Village / Chicago, USA AI DATA CENTER PENDING REVIEW
STACK's 2025-announced Chicago-area facility is a two-story, 263,000 sq. ft., 36MW data center built less than a mile from the existing CHI01 campus near O'Hare, powered by a local ComEd substation. - New Albany, USA AI DATA CENTER PENDING REVIEW
STACK's New Albany campus is a roughly 58-60MW facility expanding with 51MW of power-secured, turnkey high-density capacity due to deliver in Q1 2028.
Common Questions
Does STACK Infrastructure have AI/GPU-specific data center infrastructure?
STACK markets flexible 'AI/ML density solutions' across its portfolio, and specific facilities show concrete AI-oriented engineering — for example, its new Chicago-area (Elk Grove Village) 36MW data center is designed with a closed-loop water cooling system specifically to manage high-density AI/ML workloads, and its New Albany, Ohio campus is adding 51MW of power-secured, turnkey high-density capacity slated for delivery in Q1 2028.
Where is STACK Infrastructure's largest data center market?
Northern Virginia is STACK's biggest footprint, with the company's own locations page listing seven sites totaling roughly 2,400MW of capacity there, reflecting the region's status as the world's most established data center corridor.
Is STACK Infrastructure exiting the European colocation business?
In a deal reported in 2025-2026, STACK sold part of its European colocation business to Apollo, with STACK EMEA shifting to focus primarily on hyperscale clients while its former enterprise colocation customers continue to be supported; reporting noted some ambiguity over exactly which of its Geneva, Milan, and Oslo data centers were included in the transaction, since Frankfurt and Zurich were explicitly excluded.
How did STACK Infrastructure originate?
STACK Infrastructure was launched in early 2019 by investment firm IPI Partners through a merger of former Infomart and T5 data center assets into a single wholesale colocation and hyperscale developer.
Does STACK Infrastructure operate outside North America?
Yes — STACK expanded internationally starting with a Toronto, Ontario campus in 2021-2022, followed by entries into EMEA (Frankfurt, Zurich, Geneva, Milan, Oslo, Stockholm, Copenhagen) and APAC (Melbourne, Osaka, Tokyo, Sydney, Johor Bahru), positioning it across the Americas, EMEA and APAC as of 2025-2026.
Does STACK Infrastructure offer cloud services?
We haven't confirmed cloud services for STACK Infrastructure yet — this isn't a definitive no, since our research can miss things. Please contact STACK Infrastructure directly to confirm cloud availability.
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