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About
Mahyad Ghassemi is a two-time Y Combinator founder who previously built SigmaOS, a web browser designed for AI agent workflows that reached over 100,000 users. He currently develops tools for creating AI coworkers through natural language interfaces.
CEO at OkibiYC S25
Intro paths
Mahyad went through Y Combinator (Summer 2025) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Gustaf Alstromer, General Partner at Y Combinator — the partner who ran Okibi's batch and knows the company first-hand. YC profile ↗
In turn, Mahyad can intro founders to Okibi's investors below.
Okibi's investors · 10
Co-founders at Okibi
CEO at SigmaOSYC S21
Intro paths
Mahyad went through Y Combinator (Summer 2021) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Gustaf Alstromer, General Partner at Y Combinator — the partner who ran SigmaOS's batch and knows the company first-hand. YC profile ↗
In turn, Mahyad can intro founders to SigmaOS's investors below.
SigmaOS's investors · 9
Co-founders at SigmaOS
Founder at SigmaOSYC S21
Intro paths
Mahyad went through Y Combinator (Summer 2021) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Gustaf Alstromer, General Partner at Y Combinator — the partner who ran SigmaOS's batch and knows the company first-hand. YC profile ↗
In turn, Mahyad can intro founders to SigmaOS's investors below.
SigmaOS's investors · 9
Co-founders at SigmaOS
Frequently asked questions
- Who is Mahyad Ghassemi?
- Mahyad Ghassemi is a two-time Y Combinator founder who previously built SigmaOS, a web browser designed for AI agent workflows that reached over 100,000 users. He currently develops tools for creating AI coworkers through natural language interfaces.
- Where does Mahyad Ghassemi work?
- Mahyad Ghassemi is CEO of Okibi and CEO at SigmaOS and Founder at SigmaOS.
- What companies did Mahyad Ghassemi found?
- Mahyad Ghassemi founded Okibi, SigmaOS.
Founder mafias
Y Combinator mafia10,594
Also came through, then founded or led a company.
King's College London mafia158
Also came through, then founded or led a company.
Startup School Online mafia31
Also came through, then founded or led a company.
SigmaOS mafia3
Also came through, then founded or led a company.
About this profile. Compiled from public sources — Okibi's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights