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AUM

Estimated $3B+

Principals

2

Principal Net Worth

$3.7B

Data Flags

German internet billionaire; United Internet founder; Forbes #1462 (2025)

Dommermuth Family Office

SFOHigh Confidence

Montabaur, Germany

Last verified: Jan 17, 2026

Details

Website
Unknown
Source of Wealth
Technology / Telecommunications (United Internet)
Assets Under Management
Estimated $3B+
Source File
research/organizations/dommermuth-family-office.md
UID
fo-dommermuth-family-office

Also Known As

Ralph Dommermuth Family OfficeDommermuth Capital

Principals (2)

Ralph DommermuthFounder/Principal, CEO of United Internet/1&1OWNS
$3.7B
TBD-OWNS

Team Members (3)

Ida HuiskonenTitle TBD
WORKS_AT
Judith LiTitle TBD
WORKS_AT
Ralph DommermuthFounder, Chairman, CEO
WORKS_AT

Related Entities (3)

1&1 DrillischSubsidiary

Mobile and broadband provider Brands: 1&1, GMX, Web.de

Dommermuth FoundationFoundation
United Internet AGSubsidiary

German internet services company (~49% stake)

Relationship Strength

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Sources (6)

Changelog

  • 2026-01-17Upgraded to High confidence. Verified net worth $3.7B (CEOWORLD 2025), Forbes #1462. Updated stake to ~49% per Grokipedia mid-2025 data.
  • 2026-01-16Enriched with birth year (1963), 1988 founding story ($285K), 42% United Internet stake, GMX/Web.de brands
  • 2026-01-15Auto-generated from principal Ralph Dommermuth

Engagement & Preferences