# Mike Santullo

> Mike Santullo is a seed investor at Cleantech Circle backing Apps and Email. See 2 investments, round sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Fund: Cleantech Circle
- Location: Palo Alto, United States
- Total investments: 2
- Last investment: Aug 2011
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/santullo

Mike Santullo is a seed investor at Cleantech Circle in Palo Alto focused on Apps and Email. Mike Santullo - Managing Partner @ Cleantech Circle

## Contacts

5 contacts available for Mike Santullo: 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/mike-santullo?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Apps | 1 | 50% |
| Email | 1 | 50% |
| Computer | 1 | 50% |
| Internet | 1 | 50% |
| Software | 1 | 50% |

7 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 1 | 50% |
| Series A | 1 | 50% |

## Investments

| Company | Description | Round size | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Jeeng | Jeeng is bringing the power of AI and data intelligence to digital publishers with our proprietary solutions for driving audience engagement and revenue. Our dynamic team of automation and data experts is delivering transformative data-driven engagement strategies to the fast-changing publishing industry.Our unique content personalizationsolution is the only one of its kind that leverages first-party, opt-in data to help publishers build loyal, engaged, 1:1 subscriber relationships. With our platform, publishers can end their reliance on the walled gardens of search and social media and move beyond cookies to more accurately curate content and ads and deliver them directly to subscribers at the right time, on the right channel.Named a Fast Growth Icon, an Inc. 500 Fastest-Growing Company, a Crain’s Fast 50 and Red Herring 100 Winner, Jeeng fuels the multichannel messaging strategy for over 700 publishers, including The Atlantic, Crain’s Harper Collins, and Vox Media. With a proven track record for growth, we’ve seen a solid 165% CAGR over the last 5 years, and we invest heavily in R&D with over 50% of our global team working directly in technology development. | $1.1M | Seed | Aug 16, 2011 |  |
| The Brain | TheBrain Technology helps people make sense of the wide range of information they need to organize and assimilate on a daily basis. They believe that two Brains are better than one. And if you extend and capture your thinking about your projects and life you can get some amazing stuff done. | $3M | Series A | Jan 21, 2000 |  |

2 of 2 investments shown.

## Co-investors
- [Correlation Ventures](https://shizune.co/investors/profile/correlation-ventures) — VC Fund, 1 deal together
- [eCompanies](https://shizune.co/investors/profile/ecompanies) — VC Fund, 1 deal together
- [Ecosystem Ventures](https://shizune.co/investors/profile/ecosystem-ventures) — VC Fund, 1 deal together
- [Founder Collective](https://shizune.co/investors/profile/founder-collective) — VC Fund, 1 deal together
- [JUMP Investors](https://shizune.co/investors/profile/jump-investors) — VC Fund, 1 deal together
- [Longworth Venture Partners](https://shizune.co/investors/profile/longworth-venture-partners) — VC Fund, 1 deal together

## About Cleantech Circle

VC Fund



1 contacts available at Cleantech Circle.

| Name | Title | Profile |
| --- | --- | --- |
| Mike Santullo | Managing Partner | https://shizune.co/investors/profile/mike-santullo |

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### Similar stage
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## FAQ

### What does Mike Santullo invest in?

Mike Santullo invests primarily in Apps, Email and Computer startups, most often at Seed and Series A stage. Most of the 2 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 Mike Santullo?

Public channels for Mike Santullo 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 Mike Santullo last invest?

The most recent investment recorded for Mike Santullo closed in Aug 2011. Shizune tracks 2 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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