Thundermark Capital

Thundermark focuses on early-stage deep-technology companies, with an emphasis on robotics, artificial intelligence, machine learning, and enterprise software. The firm targets seed and start-up rounds where physical engineering and complex software converge, backing founders who build machines and the systems that control them.

Thundermark is headquartered in San Juan, Puerto Rico. Operating under Puerto Rico's tax code — most notably Act 60 — creates a different management-company and fund-formation framework than mainland US funds. This jurisdictional choice can influence carried interest treatment, operational costs, and portfolio-company structuring, making entity-level due diligence an important consideration for limited partners and co-investors.

Thundermark's investment committee and principal leadership are not set out in public record. The firm maintains a deliberately quiet operational profile, and no named founder, chief investment officer, or managing partner has been identified in the firm's official communications or regulatory filings as of mid-2026.

Thundermark's disclosed strategy is limited to direct early-stage venture investments. Whether the firm makes fund commitments, operates separately managed accounts, or participates in co-investment clubs alongside outside GPs cannot be confirmed from available public information.

Thundermark concentrates on pre-seed, seed, and start-up stage financings — the earliest institutional entry points. The firm writes first checks into companies at the intersection of hardware and software, where technical risk is high and commercialization timelines can be long.