Kairos Power cofounder-led TMNTec reports $5.125M in securities sold
The Houston energy company reported sales to 11 investors in an offering that began September 18th, without naming backers or describing a product.
By Ryan Merket · Published · Updated
Primary source: SEC
Why it matters
TMNTec has disclosed a $5.125 million energy-company financing and assembled leaders with advanced-nuclear experience, but its filing leaves the technology, investors and funded milestone unidentified.
Kairos Power cofounder Per F. Peterson is leading TMNTec, a Houston energy company that reported $5.125 million in securities sold in an offering that began on September 18th, according to its SEC Form D filing. The filing identifies Peterson as president and chief executive, but gives no description of what the company is building and does not call him a TMNTec founder.
Peterson is a professor of nuclear engineering at UC Berkeley, where his research includes high-temperature reactors, reactor safety and nuclear materials management. He also co-founded Kairos Power. The filing names him as a TMNTec executive officer, director and promoter.
The filing, and its limits
TMNTec reported $5.125 million sold to 11 investors, all accredited, under a Rule 506(b) exempt offering. Its total offering amount is listed as "Indefinite," so the $5.125 million is the amount sold to date, not a stated fundraising target. The filing says the first sale occurred on September 18th and was filed with the SEC on October 2nd.
The form also lists no sales commissions or finder's fees. It says the issuer declined to disclose a revenue range. The filing does not name the investors, disclose a valuation or explain how TMNTec intends to use the proceeds. Those omissions matter in an early energy company: a financing total alone does not show whether the capital is intended for engineering work, hiring, licensing or another milestone.
TMNTec was incorporated in Delaware in 2025 and lists a Houston business address. It identifies its industry only as "Other Energy." The document contains no technology description, product, customer, technical milestone or business model. Its category and leadership roster do not establish that TMNTec is developing a reactor, fuel, maritime system or any other particular nuclear technology.
A nuclear bench, not a disclosed product
Peterson's background makes the nuclear connection understandable, while still leaving TMNTec's actual direction unanswered. UC Berkeley's faculty profile describes his work in advanced reactor technology and nuclear systems. Kairos Power is developing fluoride salt-cooled, high-temperature reactor technology. That experience gives Peterson a history of building in advanced nuclear; it does not establish that TMNTec shares Kairos's technology or plans.
Kairos has since secured a substantially different kind of commitment for its own reactor program. TechCrunch reported on September 21st that Samsung C&T will invest in Kairos and provide engineering services worth up to $100 million combined, including $70 million in equity, to help build a 50-megawatt demonstration reactor for Google. Kairos is aiming to complete it by 2030. That deal shows the scale of the project Peterson's former company is pursuing; it offers no evidence about TMNTec's product, financing plans or relationship to Kairos.
Rachel Slaybaugh, another TMNTec director, is a general partner at DCVC focused on climate, sustainability and energy investments. Before joining the firm, she held roles at UC Berkeley and Lawrence Berkeley National Laboratory and directed a nuclear fission program at the Department of Energy's ARPA-E. Her board seat places a prominent energy investor in TMNTec's leadership circle. It does not make DCVC a confirmed investor: the Form D does not identify any of the 11 backers.
The SEC lists Christopher T. Payne as chief operating officer, secretary, treasurer, executive officer, director and promoter. Marissa Peterson is listed as a director. The filing's roster identifies who holds formal roles, but it does not spell out the operating team's experience or define the relationship between the directors.
For now, the most defensible description is narrow: TMNTec is a recently formed Houston energy company led by an experienced nuclear engineer that has disclosed $5.125 million in securities sold. The filing establishes financing and names people with advanced-energy experience. It cannot yet establish what TMNTec will deliver, who financed it, or what technical milestone the round is meant to buy. Until TMNTec identifies its product or application, comparisons with reactor developers remain speculation rather than competitive analysis.