# David Birnbaum

> David Birnbaum is a seed investor at Five Four Ventures backing Media and Entertainment and Email. See 5 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Five Four Ventures](https://shizune.co/investors/profile/five-four-ventures)
- Location: New York, United States
- Total investments: 5
- Last investment: Dec 2022
- Lead investor: 20%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/dbirnbaum1
- X (Twitter): https://twitter.com/dbirnbau
- Website: https://x.com/dbirnbau

David Birnbaum is a seed investor at Five Four Ventures in New York focused on Media and Entertainment and Email. David Birnbaum is President of Broadway Video Ventures, the company’s investment vehicle and digital media arm. Prior to BV, David was CEO and co-founder of TAKKLE, Inc., the largest social network for high school sports. Prior to TAKKLE, David was an investment professional at Apax Partners (formerly Patricof & Co. Ventures), and spentseveral years as an investment banker on Wall Street, helping to create the telecommunications group at Furman Selz, LLC. David received a B.A. from Columbia University and an MBA from the Wharton School of Business, where he was a Weiss Tech House Fellow. David currently serves on the advisory boards of Vook (a digital publishing venture) and Fleetly (a mobile health/wellness application) and is an independent board member for Goldman Sachs Investment Partners.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.5M–$2M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Media and Entertainment | 2 | 40% |
| Email | 1 | 20% |
| Privacy | 1 | 20% |
| Lifestyle | 1 | 20% |
| Mobile Apps | 1 | 20% |

11 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 3 | 60% |
| Pre-Seed | 1 | 20% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| lockr | lockr is the first consumer-focused platform for identity, consent and data. The value exchange of the Internet – trading user data for subsidized access to digital content – was originally negotiated without consumers at the table. the impending deaths of the cookie and the device ID present a unique opportunity to redefine this model andincorporate consumer choice and consent into the equation.lockr is building the means for this revolution: a universal digital identity solution for tomorrow’s consumer that is congruent with the Internet economy. | $2.5M | Pre-Seed | Dec 25, 2022 |  |
| Incredible Dream Studios | Incredible Dream is building a portfolio of iconic game IP for the next generation. | $2M | Seed | Dec 15, 2021 |  |
| Incredible Dream Studios | Incredible Dream is building a portfolio of iconic game IP for the next generation. | $2M | Seed | Dec 15, 2021 |  |
| Bellway | Bellway offers natural fiber supplements that promote healthy digestion and are made with organic ingredients and no sugar. | $2M | Seed | Sep 21, 2020 |  |
| Sanctuary | Sanctuary is a mystical products and services company that provides illuminating experiences to millennials. Sanctuary’s daily horoscopes, planetary transits, and real-time chart readings are written and performed by professional astrologers. Sanctuary’s offerings provide members with a full spectrum of cosmic insights. | $1.5M | Seed | Dec 07, 2017 |  |

5 of 5 investments shown.

## Co-investors
- [Advancit Capital](https://shizune.co/investors/profile/advancit-capital) — VC Fund, 3 deals together
- [Courtside Ventures](https://shizune.co/investors/profile/courtside-ventures) — VC Fund, 2 deals together
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund, 2 deals together
- [LightShed Ventures](https://shizune.co/investors/profile/lightshed-ventures) — VC Fund, 2 deals together
- [Mozilla Ventures](https://shizune.co/investors/profile/mozilla-ventures) — VC Fund, 2 deals together
- [Shrug Capital](https://shizune.co/investors/profile/shrug-capital) — VC Fund, 2 deals together

## About Five Four Ventures

VC Fund · New York, United States

Five Four Ventures is an incubation and venture capital firm located in New York City and San Francisco. We build businesses and make early stage investments across digitally-powered consumer brands.

2 contacts available at Five Four Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| David Birnbaum | Co-founder & Managing Partner | https://shizune.co/investors/profile/david-birnbaum-2 |
| Matthew Cavnar | Partner & Co-Founder | https://shizune.co/investors/profile/matthew-cavnar |

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## FAQ

### What does David Birnbaum invest in?

David Birnbaum invests primarily in Media and Entertainment, Email and Privacy startups, most often at Seed and Pre-Seed stage. Most of the 5 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 David Birnbaum's check size?

David Birnbaum typically joins rounds of $1.5M–$2M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds David Birnbaum participates in.

### When did David Birnbaum last invest?

The most recent investment recorded for David Birnbaum closed in Dec 2022. Shizune tracks 5 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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