Partner · Lux Capital

Tess van Stekelenburg

United States3 roles at 2 organizations

Co-founder and director of Valthos; partner at Lux Capital.

Roles3 at 2 orgs

Lux CapitalCurrent
- Partner · Investor partnerDates not recorded
ValthosCurrent
- Director · BoardDates not recorded
- Co-founder · FounderDates not recorded

1
Regulatory filingForm D: Valthos Inc.
SEC EDGAR · Apr 1, 2026 · Supports Role
“Related persons: Kathleen McMahon (Executive Officer, Director); Tess Van Stekelenburg (Director); signed by Kathleen McMahon, Chief Executive Officer”
2
CompanyValthos Raises $30M from OpenAI, Lux Capital, Founders Fund to Build Next-Generation Biodefense
PR Newswire · Oct 29, 2025 · Supports Person, Role
“Founded by Tess van Stekelenburg, partner at Lux Capital, and Kathleen McMahon, former head of Palantir's Life Sciences division”

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