Ionos
Verified“German through and through, EU-sovereign cloud done right.”
- Listing
- Frankfurt · MDAX
- Customers
- 6.63 million
- Revenue
- ~EUR 1.32 bn
- Employees
- ~4,115
90 = midpoint of Control 89 & Data 90
Sovereignty Quadrant
Control ↑ who owns & governs the company · Data → where your data lives. Every dot is a company — click to open it.
Every number below traces to 13 sourced facts across 13 independent sources, last verified 2026-06-12. 3 open questions hold confidence at 92% — they lower confidence, never the score.
Control ↑
Who legally and economically controls the company
Legal & Jurisdiction
95
Incorporated as a German SE with registered seat in Montabaur and operations run entirely from Germany — fully within EU legal reach with no foreign parent above the EU line.
Why 95? 3 sourced facts · click to expand
IONOS Group SE is registered as a European Company (SE) with its legal seat in Montabaur, Germany, under HRB 25386 at the District Court of Montabaur.
North Data company register record · as of 2026-06-12
The registered address is Elgendorfer Str. 57, 56410 Montabaur, Germany.
OpenCorpData LEI record · as of 2026-06-12
IONOS Cloud operates German data-centre infrastructure under German legal jurisdiction with European data residency contractually guaranteed, placing it squarely under EU/German law.
IONOS Group newsroom (digital sovereignty) · as of 2025-09-18
Control & Ownership
82
Voting and economic majority sit in the EU (United Internet AG, German-listed) and the stock lists in Frankfurt; points off only because control is concentrated in one founder-controlled German parent rather than dispersed.
Why 82? 4 sourced facts · click to expand
United Internet AG held 63.8% of IONOS Group SE as of 30 June 2025, with 36.2% in free float.
IONOS Group H1 2025 financial report · as of 2025-06-30
Warburg Pincus (WP XII Venture Holdings II SCSp, Luxembourg) sold its remaining IONOS shares on 27 March 2025, completing its full exit.
Simply Wall St ownership analysis · as of 2025-03-27
Parent United Internet AG is German-listed (ETR:UTDI) and majority-controlled by founder/CEO Ralph Dommermuth, who holds roughly 50%+ of the company.
Simply Wall St United Internet ownership · as of 2025
IONOS Group SE is listed on the Frankfurt Stock Exchange (Prime Standard), ticker IOS / ISIN DE000A3E00M1, and was promoted to the MDAX index effective 23 June 2025.
IONOS Group newsroom (MDAX inclusion) · as of 2025-06-23
Data →
Where your data lives and who can reach it
Data & Infrastructure
90
IONOS owns and runs its own data centers in Germany and Europe under German jurisdiction, with a contractual Germany-only residency option and BSI C5 attestation — EU-owned infra on EU soil, not a hyperscaler region.
Why 90? 3 sourced facts · click to expand
IONOS operates its own data-centre footprint (around 32 data centers) and in 2025 opened a new 8,000 sqm cloud data centre near the DE-CIX exchange in Frankfurt.
DataCenterDynamics · as of 2025-09-18
For the Germany-only option, customer data including metadata and database logs never leaves German legal jurisdiction, and EU data residency is contractually guaranteed in the German regions.
ERP-Software.org (IONOS Cloud profile) · as of 2026
IONOS was the first German provider to hold the BSI C5 attestation and BSI IT-Grundschutz certification, and it is positioned as not subject to the US CLOUD Act unlike US hyperscalers' EU regions.
Impossible Cloud (IONOS GDPR/sovereignty) · as of 2026
Operations & People
90
German-headquartered and German-led, EUR-reporting, with a workforce and customer base centered on Germany and continental Europe; minor non-EU footprint via UK/US data centers and brands.
Why 90? 3 sourced facts · click to expand
IONOS is operationally run from Karlsruhe and Berlin (the registered seat in Montabaur differs from where the company is managed).
IONOS Group FY2024 results announcement · as of 2025-03
The IONOS Group employed about 4,115 people and served roughly 6.63 million customers, with revenue of about EUR 1,316.9 million reported for fiscal year 2025.
IONOS Group investor relations · as of 2025-12-31
The CEO is Achim Weiss, a German internet-industry veteran (co-founder of Karlsruhe-based Schlund+Partner), leading a German-based management board.
IONOS management page · as of 2026
Aligned to the EU Commission’s official Cloud Sovereignty Framework (SEAL, Jun 2026) →
What we don’t know
3 open questions — they lower confidence, never the score
- ?
How much of IONOS's revenue and customer base sits outside the EU (notably its UK Fasthosts/data centers and US Lenexa, Kansas footprint)?
A material non-EU share would slightly soften the operations score, though the controlling entity and core market remain German/EU.
- ?
What exact percentage of United Internet AG does founder Ralph Dommermuth control as of 2026?
Affects how concentrated the ultimate ownership chain is; reported figures cluster around the low-to-mid 50s but the precise current stake is not freshly confirmed here.
- ?
Does the contractual 'Germany-only' residency apply by default across all IONOS products or only to specific sovereign-cloud tiers?
If sovereignty guarantees are opt-in rather than default, the infra score for the general consumer hosting business would be marginally lower than for the enterprise cloud.
EU Cloud Sovereignty Framework lens
The EU Cloud Sovereignty Framework (SEAL) formally targets cloud service providers; this is an analogous sovereignty mapping for IONOS, not an official SEAL certification.
Strategic
Explicitly positions itself as a European digital-sovereignty alternative to US hyperscalers; German-controlled and EU-listed.
Legal & jurisdictional
German SE under German/EU law; offers Germany-only jurisdiction option and is outside the US CLOUD Act's reach.
Data & AI
EU data residency contractually guaranteed in German regions; GDPR is the default; sovereign cloud offered to public sector via govdigital.
Operational
Operations, leadership and workforce centered in Germany/Europe; EUR reporting; some UK and US presence.
Supply chain
Owns its data centers, but underlying server/network hardware (chips, etc.) remains globally sourced like all providers.
Technological
Runs its own cloud stack on owned infrastructure, but core silicon and some upstream tech depend on non-EU vendors.
Security & compliance
BSI C5 attested annually, ISO 27001 and BSI IT-Grundschutz; first German provider with BSI C5.
Environmental sustainability
States 100% renewable energy for its data centers; detailed independently verified efficiency metrics not assessed here.
EU alternatives
French-incorporated, Euronext Paris-listed cloud provider with its own EU data centers; a leading EU sovereign-cloud peer.
Privately held German hosting/cloud provider running its own data centers in Germany and Finland; strong EU-sovereign alternative.
French cloud provider (Iliad group) with EU data centers and a sovereignty-focused positioning.
How the method works
Methodology v2 (provisional): the score is the midpoint of two axes — Control (who owns and governs the company) and Data (where your data lives and who can reach it). Each axis is scored only on verified evidence; unknowns reduce confidence, never the score. Every input below is sourced; the weights and judgments are open to challenge.
Spotted an error? Every claim is sourced — challenge it and we correct the record.
- 2026-06-12 — Initial golden profile, authored from primary sources (human + AI review).
Report Incorrect Data
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Verified 2026-06-12 · Human + AI joint review (sources independently checked) · Methodology