# Christian Sullivan

> Christian Sullivan is a seed investor at Republic capital backing Blockchain and Software. See 14 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Republic capital](https://shizune.co/investors/profile/republic-labs)
- Location: New York, United States
- Total investments: 14
- Last investment: Nov 2025
- Lead investor: 36%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/christian-sullivan-279322ba/

Christian Sullivan is a seed investor at Republic capital in New York focused on Blockchain and Software. Christian Sullivan is the Co-Founder and Managing Director of Republic Labs and an Advisor and Investor at Republic.Christian has invested in over 200 companies including the seed rounds of Cruise, Relativity Space, Yandex, Yubico, Ozon, and was an early check into investment funds Initialized Capital and Polychain. Christian started his careerin sales and trading in Moscow, Russia in the early 90s where he was a partner at United Financial Group which was later sold to Deutsche Bank in 2007.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.1M–$8.8M |
| Series A | $8.8M–$57M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Blockchain | 3 | 21% |
| Software | 2 | 14% |
| Cryptocurrency | 2 | 14% |
| Financial Services | 2 | 14% |
| Information Technology | 2 | 14% |

37 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 7 | 50% |
| Pre-Seed | 2 | 14% |
| Series A | 2 | 14% |
| Funding Round | 1 | 7% |
| Convertible Note | 1 | 7% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 8 | 57% |
| Canada | 1 | 7% |
| Germany | 1 | 7% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Reflex Aerospace | Reflex Aerospace builds and delivers tailor made satellite platforms. Reflex Aerospace offers manufacturing, assembly and integrations of satellites at competitive prices. | $57.4M | Series A | Nov 04, 2025 |  |
| Surge | Surge is a developer of a composable scaling meta-layer to push the bounds of Bitcoin functionality. The company's infrastructure supports app-specific rollups, GameFi, ordinals, and other DeFi use-cases while inheriting Bitcoin's security and liquidity, allowing developers to unlock Bitcoin innovation and focus on launching their ideas. | $1.8M | Pre-Seed | Oct 17, 2024 |  |
| Zebec | Zebec is a continuous settlement protocol on Solana. Zebec is enabling the composable transfer of value starting with Stream Payroll. | $6M | Seed | Nov 10, 2021 |  |
| Zebec | Zebec is a continuous settlement protocol on Solana. Zebec is enabling the composable transfer of value starting with Stream Payroll. | $6M | Seed | Nov 10, 2021 |  |
| Portal to Bitcoin | Portal is a financial services company that trades crypto anywhere without putting coins at risk, all from within a controllable wallet. Founded in 2018, Portal is headquartered in San Francisco, California. | $8.5M | Seed | Jun 01, 2021 |  |
| dClimate | dClimate is the world's first transparent, decentralized marketplace where climate data, forecasts, and models are standardized, monetized, and distributed. The marketplace connects data publishers directly with data consumers, making climate data more accessible and reliable. When data providers share data and forecasts with the market it isautomatically scored for reliability, which helps consumers to shop for information. In exchange, dClimate creates a simple, direct-to-consumer distribution mechanism to monetize their work. | $3.5M | Seed | Apr 08, 2021 |  |
| dClimate | dClimate is a decentralized climate data infrastructure and marketplace that standardizes, distributes, and makes climate data. | $3.5M | Seed | Apr 08, 2021 |  |
| Blackcart | Blackcart develops try-before-you-buy software for e-commerce merchants. Its proprietary try before you buy fraud ai empowers merchants to give their customers the confidence of in-store shopping, at home, and risk-free. | $8.8M | Series A | Jan 25, 2021 |  |
| Blackcart | Blackcart develops try-before-you-buy software for e-commerce merchants. Its proprietary try before you buy fraud ai empowers merchants to give their customers the confidence of in-store shopping, at home, and risk-free. | $8.8M | Seed | Jan 25, 2021 |  |
| Blackcart | Blackcart develops try-before-you-buy software for e-commerce merchants. Its proprietary try before you buy fraud ai empowers merchants to give their customers the confidence of in-store shopping, at home, and risk-free. | $8.8M |  | Jan 25, 2021 |  |

10 of 14 investments shown.

## Co-investors
- [Hyde Park Venture Partners](https://shizune.co/investors/profile/hyde-park-venture-partners) — VC Fund, 3 deals together
- [Shima Capital](https://shizune.co/investors/profile/shima-capital) — VC Fund, 3 deals together
- [Breyer Capital](https://shizune.co/investors/profile/breyer-capital) — VC Fund, 2 deals together
- [Cadenza Ventures](https://shizune.co/investors/profile/cadenza-capital-management) — VC Fund, 2 deals together
- [CoinFund](https://shizune.co/investors/profile/coinfund) — VC Fund, 2 deals together
- [Finality Capital Partners](https://shizune.co/investors/profile/finality-capital-partners) — VC Fund, 2 deals together

## About Republic capital

VC Fund · New York, United States

Republic Labs is a growth-stage investment advisory focused on profitability and resiliency. Republic Labs works with high net-worth individuals and family offices to syndicate investment opportunities. It was founded in

3 contacts available at Republic capital.

| Name | Title | Profile |
| --- | --- | --- |
| Christian Sullivan | Co-Founder and Managing Director | https://shizune.co/investors/profile/christian-sullivan-ef44 |
| Julian Jung | Managing Director, Venture & Private Equity \| Republic Labs | https://shizune.co/investors/profile/julian-jung |
| Mo Islam | Investor | https://shizune.co/investors/profile/mo-islam |

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## FAQ

### What does Christian Sullivan invest in?

Christian Sullivan invests primarily in Blockchain, Software and Cryptocurrency startups, most often at Seed and Pre-Seed stage. Most of the 14 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Christian Sullivan's check size?

Christian Sullivan typically joins rounds of $1.1M–$8.8M at Seed and $8.8M–$57M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Christian Sullivan participates in.

### When did Christian Sullivan last invest?

The most recent investment recorded for Christian Sullivan closed in Nov 2025. Shizune tracks 14 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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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