Anthropic
Building reliable, interpretable, and steerable AI systems
Publicly reported investor
Sound Ventures
Sound Ventures is a publicly reported investor in 4 companies that are also in Sahin Boydas' public portfolio, as of September 2026: Anthropic, MainStreet and Polsia, 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 Sound Ventures 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 Sound Ventures 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.
MainStreet
Small business accounting and financial management software
Polsia
Portfolio company
Warp
Payroll and compliance for startups
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.
- Anthropic: Source: Anthropic
- MainStreet: Source: Not Boring
- Polsia: Source: AIN
- Warp: Source: Warp
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 Sound Ventures publicly reported in?
Sound Ventures is a publicly reported investor in 4 companies that are also in Sahin Boydas' public portfolio, as of September 2026: Anthropic, MainStreet, Polsia and Warp.
Which Categories do the companies with Sound Ventures as a publicly reported investor belong to?
The 4 companies span 3 Categories: AI (3), Software (3) and Fintech (1). Each Category links to every portfolio company in it.
What does this Sound Ventures page not say?
It is not a cap table and not a complete list of Sound Ventures' investments. It lists only companies in Sahin Boydas' public portfolio where a cited public source reports Sound Ventures as an investor, and it carries no deal terms.