Justin Zeefe
Founding Partner @ Green Flag Ventures
Greater Los Angeles Area, United States
Justin Zeefe is a seed investor at Green Flag Ventures in Greater Los Angeles Area focused on Internet Radio and Telecommunications. Justin Zeefe is Founding Partner at Green Flag Ventures; a dual-US/Ukraine-based venture capital firm investing in early-stage, innovative Ukrainian technology startups. Prior to co-founding Green Flag, Justin co-founded Nisos: the Managed Intelligence Company, which delivers smart defense and effective response against advanced threatactors, disinformation, and abuse of digital platforms for the Fortune 1000. Before co-founding Nisos, Justin served for a decade in the US Government, pursuing & countering sophisticated digital adversaries.
- Total investments:
- 3
- Last investment:
- Lead investor:
- 67%
Last updated:
For AI agents: llms.txt
Industries Justin Zeefe invests in
Stages Justin Zeefe invests in
Countries Justin Zeefe invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Internet Radio 1 (33%)
- Telecommunications 1 (33%)
- Information Technology 1 (33%)
Country
- Estonia 1 (33%)
- Ukraine 1 (33%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Himera is a defense technology startup, manufactures communication radio stations. | $2.5M / Seed / Dec 18, 2025 | ||
| TELETACTICA specializes in long-range radio communication systems. Our services include R&D for local businesses, from preliminary samples to final product development. Our priority is to delve deeply into developing new products based on scientific discoveries and meaningful engineering innovation | $1.5M / Seed / Jul 17, 2025 | ||
| Himera is a defense technology startup, manufactures communication radio stations. | $150K / Seed / Oct 11, 2024 |
Co-Investors
About Green Flag Ventures
Green Flag Ventures is a venture capital firm dedicated to nurturing the growth of the Ukrainian tech ecosystem through targeted investments in early-stage startups. With a keen focus on dual-use technology, the firm manages a $20M fund, strategically investing in innovative companies that show potential for both commercial and strategicapplications. Our investment range lies between $150K and $1M, aimed at startups with pre-money valuations of $1M to $25M.Our approach is unique, bridging critical gaps between the Ukrainian and US tech sectors, thereby fostering a vibrant cross-border exchange of ideas, technology, and resources. Co-founded by Justin Zeefe in the USA and Deborah Fairlamb in Ukraine, Green Flag Ventures capitalizes on its founders' diverse expertise and deep understanding of both markets. We offer more than just capital; our portfolio companies gain access to an ecosystem of support, including mentorship, network connections, and operational guidance, ensuring not just growth but also sustainable development.At Green Flag Ventures, we believe in the transformative power of technology and entrepreneurship. Our mission is to be at the forefront of this transformation, empowering Ukrainian founders both at home and abroad. We are committed to achieving superior returns for our investors while playing a pivotal role in the regional growth and stability. Through our proprietary deal flow and rigorous diligence process, we ensure that each investment is poised for outsized growth and favorable outcomes, aligning investor success with regional progress.
Green Flag Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Deborah Fairlamb
Founding Partner
|
|||
|
Justin Zeefe
Founding Partner
|
|||
Access 48,091 investors
822 industries, 177 countries. Updated daily. Emails and phones included.
Browse database — It's Free!
Find investors for your startup
Search 48,091 investors by industry and country. Emails and phones included.
Similar Investors
Recommended lists
FAQ
What does Justin Zeefe invest in?
Justin Zeefe invests primarily in Internet Radio, Telecommunications and Information Technology startups, most often at Seed stage. Most of the 3 investments tracked by Shizune back companies in Estonia. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Justin Zeefe?
Public channels for Justin Zeefe include LinkedIn. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Justin Zeefe last invest?
The most recent investment recorded for Justin Zeefe closed in Dec 2025. Shizune tracks 3 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
Contact your first 100 investors today
Find who invests in your industry, stage, and country. Download investor list with emails in 5 minutes.
Find investors — It's Free!
Continue with Google
Continue with LinkedIn
