Jeff Yass, Susquehanna and ByteDance
Jeff Yass co-founded Susquehanna and owns about 7% of ByteDance personally, according to Fortune 34.
Full nameJeffrey Steven Yass
NationalityUnited States
Known forCo-founder of Susquehanna International Group; early ByteDance investor
Jeff Yass's companies
| Company | Role |
|---|---|
| Susquehanna International Group (SIG) | Co-founder and managing director |
| ByteDance | Personal stake of about 7%; SIG holds about 15% |
| Cato Institute | Executive advisory council since 2001 |
Susquehanna
SIG is a Philadelphia-area trading and technology firm, described as the largest trader of liquid stocks in the US 1.
ByteDance
SIG invested in ByteDance in 2012, before TikTok existed. Fortune reported that SIG holds about 15% and that Yass owns about 7% personally 34.
Frequently asked questions
About 7% personally, according to Fortune. SIG holds about 15%.
A trading and technology firm he co-founded in 1987, based in the Philadelphia area.
Sources✓ Verified 14 Nov 2026
1 Fortune, Trump, Jeff Yass and TikTok, 1 Jan 1970, Stakes
2 Wikipedia, Jeff Yass, 1 Sep 2026, SIG
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