An angel investor and operator angel based in United States, William Reulein has one known investment, YippeeO.
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Investment focus
- Stage
- Seed
- Sector
- SaaS
- Focus
- AdvertisingDigital MarketingDigital Marketing SaaSEmail MarketingMarketing TechSearch Engine Optimization (SEO)
Contacts
William Reulein portfolio company (1)
- YippeeO
Investor Profile
The listing covers sector SaaS, and focus areas Advertising, Digital Marketing, Digital Marketing SaaS and Email Marketing. Startups operating in these areas may find William Reulein relevant.
The stage tag on this profile is Seed.
Reviewing the investment history helps decide whether there is a realistic fit before reaching out.
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Frequently asked questions
Who is William Reulein?
William Reulein is an angel investor and operator angel based in United States with one known investment on file, YippeeO. The sections above list the sectors and stages attached to that record.
What does William Reulein invest in?
Listed sectors include SaaS; listed focus areas include Advertising, Digital Marketing, Digital Marketing SaaS and Email Marketing. 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 William Reulein invest at?
The database lists William Reulein for 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.
How do I contact William Reulein?
An email address and a LinkedIn page are on file for William Reulein. 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 6 September 2026 · How this data is built · Report a correction or request removal