Bottom line: Vaultica didn’t exist as a name until its carve-out from STACK Infrastructure closed in August 2025. What it inherited is real and now independently confirmed across three Nordic markets — Oslo, Copenhagen, and Stockholm — but the corporate identity itself, and the exact boundary of what it owns, are still worth putting directly to the company.
What checks out
- Full ownership chain, confirmed and closed: IPI Partners (STACK’s prior owner) was acquired by Blue Owl Capital, closing 6 January 2025. Apollo Global Management then acquired STACK’s entire European colocation business — seven sites across Stockholm, Oslo, Copenhagen, Milan, and Geneva — from Blue Owl in a carve-out, announced 29 April 2025 and closed 13 August 2025. The carved-out business relaunched publicly as Vaultica, CEO Sherif Rizkalla (previously CEO of STACK’s EMEA colocation unit), rebranded around December 2025.
- This is confirmed to be two separate operators, not one, resolved by cross-referencing three independent sources: the Brønnøysund/Skatteetaten registry chain for the STACK-linked entities shows no OSL01 or OSL02 entity anywhere in it; stackinfra.com’s own current site lists only OSL03 (Fetsund) and OSL04 for Oslo; vaultica.com/norway/ lists only OSL01 and OSL02. The same split now appears in Copenhagen: Vaultica’s COP01A versus STACK’s separately retained COP02.
- Nordic portfolio, all independently verified on Vaultica’s own current pages: OSL01 Ulven and OSL02 Trollåsen (Oslo), COP01A (Copenhagen), STO01A (Stockholm/Upplands Väsby, 12 MW, 5,600 m²).
- COP01A, Copenhagen — 1.2 MW IT load, ~4,600 m² across three floors, certifications reported (ISO 14001, 27001, 50001, 9001, PCI DSS, SOC 1 Type 2). Confirmed history, stated directly on Vaultica’s own site: operated as STACK COP01 until August 2025, originally DigiPlex Copenhagen before that.
A capacity figure that won’t settle — twice
This isn’t a one-off. Vaultica’s own website gives two different capacity figures for the same site, on more than one site, in the same pattern:
- OSL01 (Oslo): 5.6 MW on the Nordic-region page, 7.5 MW IT load (across 5,100 m²) on the Norway page.
- COP01 (Copenhagen): 1.2 MW on the Denmark page, 800 kW on the Nordic-region page.
We show both figures in both cases and have not picked either. Taken together, this is a data-quality signal about Vaultica’s own published numbers, not just a quirk of one site — worth weighing when deciding how much confidence to place in any capacity figure Vaultica publishes, until the company clarifies. It’s also not an unusual thing to find in the months after a rebrand, when marketing pages get updated at different speeds across regions; we note the pattern factually, not as evidence of bad faith. Both the OSL01 and COP01 discrepancies are now on our right-of-reply follow-up list for Vaultica.
Heat reuse into the Hafslund Oslo Celsio district-heating system appears to be continuing under the new ownership — Vaultica’s current site describes OSL01 as “repurposing waste heat to warm thousands of local homes” — but the precise volume post-transaction (historically ~3.5 MW, ~25 GWh/year, up to 5,000 homes under STACK) is not re-confirmed anywhere we could find.
Other open questions we’re not resolving for the company
The legal-entity question is now substantially answered — by the register, not by the company. We previously noted that Vaultica does not appear in Brreg/Proff under that name, and that its Norwegian legal entities appeared to retain older names from the STACK era. Nkom’s register of commercial datacenter operators confirms it: the register lists SI OSL 01 AS (org. 981 663 322) and SI OSL 02 AS (org. 994 817 477) as separate registered operators, while the Brønnøysund ownership chain under Infrastructure Nordics 2 S.à.r.l covers only SI OSL 03.1, 03.2, 04, 04.2, 05.2 and 06. Two things follow: the portfolio split we inferred is independently confirmed, and the Norwegian entities behind OSL01 and OSL02 are still named SI OSL 01 AS and SI OSL 02 AS — they have not been renamed to Vaultica. The question stays on the right-of-reply list for confirmation from the company itself, but it is no longer an open question in any practical sense.
No PUE figure is published anywhere on Vaultica’s current site for any of its four Nordic buildings.
What to weigh on the Sovereign axis
Leadership is entirely non-Norwegian and international — Rizkalla, and an ultimate owner (Apollo Global Management) based in the US — running sites in three separate Nordic jurisdictions. That’s not disqualifying on its own, but it belongs in the same conversation as the ownership-chain question above.
Confidence
The ownership chain to Apollo: A (corroborated across registry evidence and multiple independent primary sources). That the Norwegian entities behind OSL01/OSL02 are still named SI OSL 01 AS and SI OSL 02 AS rather than renamed to Vaultica: A (Nkom’s mandatory operator register, cross-read against the Brønnøysund ownership chain). That OSL01’s and COP01’s capacity figures genuinely conflict, each on two of Vaultica’s own pages: A — both numbers are independently findable in each case; which figure is correct in either case is C. Continuing heat reuse: B (Vaultica’s own current site states it; volume not re-confirmed). Right of reply was sent to Vaultica (Sherif Rizkalla, via [email protected]) on 22 August 2026, and now covers both capacity discrepancies; the response window is open until 4 September 2026.