Castle Fund Overview
- Investor Type
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Venture Capital
- Status
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Active
- Professionals
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1
- Investments
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4
- Portfolio
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4
Castle Fund General Information
Company Description
Founded in 2025, Castle Fund is a venture capital firm based in Pacifica, California. The firm seeks to invest in biotech, aerospace, energy, robotics, and chips sectors. Castle Fund focuses on seed-stage deep technology companies with intellectual property moats, including patents and trade secrets.
Business Details
Website
www.castle-fund.comYear Founded
Investor Status
Primary Investor Type
Corporate Office
- 217 Roberts Road
- Pacifica, CA 94044
- United States
Castle Fund Investments (4)
| Company Name | Deal Date | Deal Type | Deal Size | Industry | Company Stage | Lead Partner |
|---|---|---|---|---|---|---|
| Cirrus Therapeutics | 04-Aug-2026 | Seed Round | Drug Discovery | Generating Revenue | ||
| Overlord Labs | 07-Jul-2026 | Electrical Equipment | Startup | |||
| Arinna | 27-Feb-2026 | Seed Round | Aerospace and Defense | Generating Revenue | ||
| Sophia Space | 31-Dec-2025 | Seed Round | Aerospace and Defense | Generating Revenue |
Castle Fund Investments by Industry, Year, and Region
Investments by Industry
Investments by Year
Investments by Region
Castle Fund Co-Investors (31)
| Name | With | Exits | Lead Partner | Series | Industry |
|---|---|---|---|---|---|
| AngelList | 1 |
|
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| Band of Angels |
|
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| KDDI |
|
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| Polaris Partners |
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| Sand Hill Angels |
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Castle Fund FAQs
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What is Castle Fund?
Founded in 2025, Castle Fund is a venture capital firm based in Pacifica, California.
-
When was Castle Fund founded?
Castle Fund was founded in 2025.
-
Where is Castle Fund headquartered?
Castle Fund is headquartered in Pacifica, CA.
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What is Castle Fund's total asset value?
Castle Fund has around in total assets under management.
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How many investments has Castle Fund made?
Castle Fund has made 4 investments.
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What has Castle Fund invested in?
Castle Fund has made numerous investments in companies like Cirrus Therapeutics, Overlord Labs, and Arinna within the Drug Discovery, Electrical Equipment, and Aerospace and Defense industries.
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What has Castle Fund invested in recently?
Castle Fund's latest investment was on 04-Aug-2026 in Cirrus Therapeutics, a company within the Drug Discovery industry.
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