# Ken Kastner

> Ken Kastner is a Series A investor backing Email and E-Commerce. See 1 investment, round sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Total investments: 1
- Last investment: Oct 2010
- Lead investor: 0%
- Last updated: Aug 2026

Ken Kastner is a Series A investor focused on Email and E-Commerce. Ken Kastner

## Contacts

5 contacts available for Ken Kastner: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/ken-kastner?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Email | 1 | 100% |
| E-Commerce | 1 | 100% |
| Web Hosting | 1 | 100% |

## Investments

| Company | Description | Round size | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Unsubscribe.com | Unsubscribe is a powerful service that addresses a simple problem - getting rid of unwanted mailing lists. With the click of a button, users instantly send unwanted mailing lists to Unsubscribe.com for safe removal.Users can either download an Unsubscribe button to be used in their email client or forward unwanted mail from any device. Thecustom button allows one to check off multiple emails at a time to Unsubscribe from, revisiting a brand new inbox. | $2.1M | Series A | Oct 21, 2010 |  |

1 of 1 investments shown.

## Co-investors
- [Coffin Capital](https://shizune.co/investors/profile/coffin-capital) — VC Fund, 1 deal together
- [CRV](https://shizune.co/investors/profile/crvvc) — VC Fund, 1 deal together
- [Frontier Venture Capital](https://shizune.co/investors/profile/dfj-frontier) — VC Fund, 1 deal together
- [First Round Capital](https://shizune.co/investors/profile/first-round-capital) — VC Fund, 1 deal together
- [JUMP Investors](https://shizune.co/investors/profile/jump-investors) — VC Fund, 1 deal together
- [SV Angel](https://shizune.co/investors/profile/sv-angel) — VC Fund, 1 deal together

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### Similar industry
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- [Accel](https://shizune.co/investors/profile/accel) — VC Fund

### Similar stage
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## Featured in investor lists
- [Email Angel Investors](https://shizune.co/investors/email-angel-investors)

## FAQ

### What does Ken Kastner invest in?

Ken Kastner invests primarily in Email, E-Commerce and Web Hosting startups, most often at Series A stage. Most of the 1 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Ken Kastner?

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 Ken Kastner last invest?

The most recent investment recorded for Ken Kastner closed in Oct 2010. Shizune tracks 1 investment 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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