Boom Supersonic
Making the World Dramatically More Accessible
Publicly reported investor
Sam Altman
Sam Altman is a publicly reported investor in 4 companies that are also in Sahin Boydas' public portfolio, as of September 2026: Boom Supersonic, Exowatt and Hermeus, and 1 more.
This page collects the public evidence behind that overlap. Every company below has its own source-backed directory of publicly reported investors, and Sam Altman appears in each of those directories with a cited public source. The list is evidence-based and may not be complete: it includes only companies in Sahin Boydas' public portfolio where a cited source reports Sam Altman as an investor. It is not a cap table, and it carries no deal terms.
Companies
4 companies in the public portfolio, listed A–Z with each company's public one-liner, Category, Sub-Category, and current public status. Every card links to the company profile and to the company's full directory of publicly reported investors.
Categories
Counted across the 4 companies above; a company that carries more than one Category is counted in each.
Sources
One reviewed public source per company. Each link opens this site’s source reference, which names the publisher and then links out, so no third-party page is republished here.
- Boom Supersonic: Source: Boom Supersonic
- Exowatt: Source: Exowatt
- Hermeus: Source: CNBC
- Volantis: Source: Volantis
Related publicly reported investors
Other investors on this site that are publicly reported in some of the same companies. The number is how many of the 4 companies above also list that investor.
Frequently asked questions
How many companies in Sahin Boydas' public portfolio is Sam Altman publicly reported in?
Sam Altman is a publicly reported investor in 4 companies that are also in Sahin Boydas' public portfolio, as of September 2026: Boom Supersonic, Exowatt, Hermeus and Volantis.
Which Categories do the companies with Sam Altman as a publicly reported investor belong to?
The 4 companies span 3 Categories: Aerospace (3), Climate (1) and Energy (1). Each Category links to every portfolio company in it.
What does this Sam Altman page not say?
It is not a cap table and not a complete list of Sam Altman's investments. It lists only companies in Sahin Boydas' public portfolio where a cited public source reports Sam Altman as an investor, and it carries no deal terms.