# Stephen Cole

> Stephen Cole is a pre-seed investor at Castle (Los Angeles) backing Bitcoin and Software. See 24 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Castle](https://shizune.co/investors/profile/orqestra)
- Location: Los Angeles, United States
- Total investments: 24
- Last investment: Feb 2025
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://linkedin.com/in/sthenc
- X (Twitter): https://twitter.com/sthenc
- Website: https://x.com/sthenc

Stephen Cole is a pre-seed investor at Castle in Los Angeles focused on Bitcoin and Software. Angel Investor

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1M–$19M |
| Angel | $665k–$1.5M |
| Pre-Seed | $620k–$5M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Bitcoin | 4 | 17% |
| Software | 3 | 13% |
| FinTech | 2 | 8% |
| Health Care | 2 | 8% |
| Restaurants | 2 | 8% |

43 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Pre-Seed | 11 | 46% |
| Seed | 8 | 33% |
| Angel | 2 | 8% |
| Series A | 1 | 4% |
| Funding Round | 1 | 4% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 19 | 79% |
| United Kingdom | 1 | 4% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Valar Atomics | Uses nuclear fission to create gas and oil from ambient air. | $19M | Seed | Feb 19, 2025 |  |
| MoldCo | MoldCo helps individuals to reclaim their health from mold. | $3M | Pre-Seed | Dec 10, 2024 |  |
| Superpower | The world's most comprehensive and convenient platform to manage your health, for life. |  | Seed | Nov 26, 2024 |  |
| Ark Labs | Ark Labs is scaling Bitcoin with Ark, a new layer two protocol for fast, low-cost, seamless payments. | $2.5M | Pre-Seed | Aug 22, 2024 |  |
| Navier | Navier is America's next-generation maritime company. Our mission is to build the most compelling zero-emission marine vessels, which drastically reduce operational costs and enable a new kind of clean, scalable waterborne transportation for people and goods worldwide. | $111.1K | Series A | Jun 20, 2024 |  |
| Popularium | Popularium was founded by an all-star team of gaming industry veterans responsible for the largest asset-based games and platforms in history—such as Magic: The Gathering, Hearthstone, World of Warcraft, the Halo franchise, and Xbox Live.Popularium started from a simple idea that we shared: What would games look like if they involved thecommunity from an early stage? What if this community had the tools to impact the narrative and create assets of real value from the game? | $2M | Seed | Mar 26, 2024 |  |
| Portal | Portal is a cell engineering platform firm that enables next generation cell engineering and cell analytics in research and clinical settings. | $5M | Pre-Seed | Mar 19, 2024 |  |
| Rainmaker Technology | Rainmaker employs cutting-edge technology to generate rain, replenish water sources, and address drought challenges in a sustainable and effective manner. |  | Pre-Seed | Nov 13, 2023 |  |
| Aethero | Aethero enables satellites to deploy AI/ML applications on orbit with high-performance space computers. Their compute modules are equipped with the latest storage, processing, and connectivity capabilities to support reinforcement learning and in-space model training for missions such as such visual positioning, EO data processing, link budgetcalculation, autonomous operation, and more |  | Pre-Seed | Nov 01, 2023 |  |
| Sinatra | Sinatra is a technology company that, with its all-in-one app, aims to revolutionize the hospitality industry. It provides Sinatra Training, which enables continuous digital training for employees by allowing employers to upload content and employees to access it via the app. | $1.1M |  | Jun 29, 2023 |  |

10 of 24 investments shown.

## Co-investors
- [Fulgur Ventures](https://shizune.co/investors/profile/fulgur-venture) — VC Fund, 4 deals together
- [1517 Fund](https://shizune.co/investors/profile/1517-fund) — VC Fund, 3 deals together
- [BBQ Capital](https://shizune.co/investors/profile/bbq-capital) — VC Fund, 3 deals together
- [Conscience VC](https://shizune.co/investors/profile/conscience-vc) — VC Fund, 2 deals together
- [Federman Capital](https://shizune.co/investors/profile/federman-capital) — VC Fund, 2 deals together
- [Helium-3 Ventures](https://shizune.co/investors/profile/helium-3-ventures) — VC Fund, 2 deals together

## About Castle

VC Fund · Coral Gables, United States

Castle is a technology company that makes it easy for companies to add bitcoin to their treasury, regardless of their knowledge of bitcoin. We enable businesses to go from zero to bitcoin in less than 48 hours.

2 contacts available at Castle.

| Name | Title | Profile |
| --- | --- | --- |
| João Almeida | CTO and Co-founder | https://shizune.co/investors/profile/jo%C3%A3o-almeida |
| Stephen Cole | CEO | https://shizune.co/investors/profile/stephen-cole-b4cf |

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## FAQ

### What does Stephen Cole invest in?

Stephen Cole invests primarily in Bitcoin, Software and FinTech startups, most often at Pre-Seed and Seed stage. Most of the 24 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 Stephen Cole's check size?

Stephen Cole typically joins rounds of $1M–$19M at Seed, $665k–$1.5M at Angel and $620k–$5M at Pre-Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Stephen Cole participates in.

### When did Stephen Cole last invest?

The most recent investment recorded for Stephen Cole closed in Feb 2025. Shizune tracks 24 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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