Investor profile
Sounil Yu
Angel, Operator angel & Venture Advisor at YL Ventures, Advisor at Strategic Cyber Ventures
Sounil Yu is an angel investor and operator angel based in Reston, Virginia, United States with 8 known investments: Sublime Security, Feroot Security, Valence Security, Enso Security, Grip Security, build.security, GreyNoise Intelligence and SPHERE Technology Solutions.
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Investment focus
Contacts
Sounil Yu portfolio companies (8)
- Sublime Security
- Feroot Security
- Valence Security
- Enso Security
- Grip Security
- build.security
- GreyNoise Intelligence
- SPHERE Technology Solutions
Affiliated funds' portfolios
Venture Advisor at YL Ventures, whose known portfolio counts 9 companies
- MIND
- Native
- Opti
- Minimus
- Native Security
- Hush Security
- Miggo Security
- Novee Security
- Opti Security
Advisor at Strategic Cyber Ventures, whose known portfolio counts 6 companies
- Doppel
- Cloudburst Technologies
- Evo Security
- LimaCharlie
- Modveon
- GovEagle
Investor Profile
Founders in the listed sectors Hardware and SaaS, and focus areas Cybersecurity and Enterprise SaaS will recognize the pattern in this portfolio.
Sounil Yu appears in Pre-Seed and Seed rounds across the known deals.
The portfolio and focus above give founders context on whether Sounil Yu matches their raise.
Colleagues
Justin Somaini
Angel Investor, Venture Capitalist and CSO
San Francisco, United States
Leonid Belkind
Insider
Israel
Amichai Shulman
Venture Advisor
Israel
Nir Polak
Insider - YL Advisory Board
San Francisco, United States
Yoav Leitersdorf
Managing Partner
San Francisco, United States
Ofer Schreiber
Senior Partner & Head of Israel Office
Tel Aviv, Israel
Ken Gonzalez
Advisor
San Francisco, United States
Avi Shua
Insider
Sydney, Australia
Sharon Seemann
Investor
Tel Aviv, Israel
Kirk Manoogian
Partner
San Francisco, United States
Gili Berkovitz
Investor
New York, United States
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Frequently asked questions
Who is Sounil Yu?
Sounil Yu is an angel investor and operator angel based in Reston, Virginia, United States with 8 known investments on file, among them Sublime Security, Feroot Security and Valence Security. The sections above list the sectors, stages and firms attached to that record.
What does Sounil Yu invest in?
Listed sectors include Hardware and SaaS; listed focus areas include Cybersecurity and Enterprise SaaS. Those tags come from the companies attached to this profile, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Sounil Yu invest at?
The known deals of Sounil Yu include Pre-Seed and Seed rounds. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Sounil Yu listed at?
Sounil Yu is listed as Venture Advisor at YL Ventures. 11 other people in the database share a firm with Sounil Yu.
How do I contact Sounil Yu?
An email address and a LinkedIn page are on file for Sounil Yu. The address stays masked on this page and is readable inside RaiseHunt after you create an account. The database holds no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal