Valar's own document library lists 'Announcing a Pre-Seed Funding Round Led By Riot Ventures' (a LinkedIn post that needs a login, so it was not read); the $1.5 million amount and the November 2023 date rest on the company's archived April 2024 homepage and Mother Jones (orig-050). Riot Ventures went on to lead the February 2025 seed (fund-003) and joined the August 2026 Series B (fund-007). Riot's own partner page (read 29 Sept 2026) says its co-founder and general partner Stephen Marcus 'serves on the Boards of' several companies, naming Valar Atomics. That adds a third investor director on the public record, beside Sequoia's Shaun Maguire and Snowpoint's Doug Philippone (ppl-010). Taylor has said he pitched about 80 venture firms before Marcus made the first investment (The New Republic, cited in ppl-010). Valar publishes no board list, and no Form D by Valar exists to name its directors (fund-010), so this seat is known only from the investor's page.

• Library (Valar Atomics) primary company
• Stephen Marcus (partner biography) (Riot Ventures) primary company “Steve serves on the Boards of Shield AI (aerospace and defense), Valar Atomics (nuclear power)”