Data Center Campus
STACK's MIL01 campus in Siziano, south of Milan, holds three data center buildings on one lot with its own high-voltage substation. SUPERNAP Italia developed it, and STACK has expanded it since 2021. First built in 2016, with expansions through 2025.
STACK's MIL01 campus sits on Via Marche in the Siziano industrial zone, in the province of Pavia, about 15 km south of central Milan. The fenced lot covers about 10 hectares beside the SP40 Binasco-Melegnano road.
SUPERNAP Italia chose Siziano in 2015 for its highway access, low seismic risk and a nearby Terna high-voltage substation. Construction started in July 2015. IPI Partners bought SUPERNAP Italia in 2021 and rebranded it STACK EMEA in 2022. In 2025 STACK sold its European enterprise colocation business to Apollo-managed funds. That business now runs as Vaultica and sells colocation on the campus. STACK kept the buildings and its hyperscale customers. STACK's other Siziano data centers sit on separate lots nearby.
Buildings
| Site | Operator | Status | Operational | Building Size | Built |
|---|---|---|---|---|---|
| Stack: MIL01A | STACK INFRASTRUCTURE |
Operational
|
░░░ Request Dataset MW | ░░░░░░░ Request Dataset SqFt | 2016 |
| Stack: MIL01B | STACK INFRASTRUCTURE |
Operational
|
░░░░ Request Dataset MW | ░░░░░░░ Request Dataset SqFt | 2021 |
| Stack: MIL01C | STACK INFRASTRUCTURE |
Operational
|
░░░ Request Dataset MW | ░░░░░░ Request Dataset SqFt | 2025 |
STACK Infrastructure is a privately held platform sponsored by IPI Partners that focuses on large scale wholesale capacity and campus development for hyperscale and enterprise customers.
The company was launched in 2019 when IPI combined the remaining Infomart Data Centers assets with selected T5 Data Centers facilities, and industry coverage at launch cited eight data centers across six U.S. markets totaling about 100 MW. In March 2022, IPI unified DigiPlex in the Nordics and SUPERNAP Italia in Milan under the STACK brand to form STACK EMEA, expanding the platform across Europe. STACK has since added international sites, including the first phase of a 56 MW campus in Toronto and its first Australian data center in Melbourne. Core services referenced by the company and trade press include wholesale colocation, build to suit, and powered shell solutions.
July 29, 2022 STACK INFRASTRUCTURE
Stack Infrastructure has announced the opening of a data center in Siziano, outside Milan, Italy. The MIL02 data center has a capacity of 10MW, and it spans 97,000 square feet (9,000 square meters). Interestingly, Stack completed the data center in under 12 months. The new data center was...
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November 25, 2021 Stack: MIL01A
Supernap Italia has announced the opening of its second data center on its Siziano campus in Milan, Italy. The new data center has two independent data halls. With this, the facility now has 1 million square feet of space (100,000 square meters) and 40MW of capacity. CEO of Supernap Italia,...
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May 06, 2021 Stack: MIL01A
Supernap Italia has announced expansion plans for its data center campus in Milan, Italy, after acquiring development-ready land totaling 170,000sq m (1,830,000 sq ft). It is situated in the same location as the company’s other Siziano campus. The land acquisition gives the company the ability to...
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February 26, 2021 Stack: MIL01A
SUPERNAB Italia announced that 100% of ACDC Holding’s share capital, a controlling shareholder in the company, has been acquired. The acquisition was made by affiliates of IPI Partners, LLC from affiliates of Accelero Capital Holdings. The CEO of SUPERSNAP, Sherif Rizkilla, said that IPI is the...
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September 13, 2020 Stack: MIL01A
SUPERNAP Italia Becomes the Only Operational Data Center in Italy to Earn ANSI/TIA-942 Rated 4 (Tier 4) Certification from EPI Milan, Italy, September 13, 2020 -- SUPERNAP Italia, the most advanced data center in Southern Europe, has achieved the ANSI/TIA-942 Rated 4 (formerly known as Tier 4)...
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