# Mark Mastrov

> Mark Mastrov is a Series A investor backing Fitness and Health Care. See 5 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Location: Carlsbad, United States
- Total investments: 5
- Last investment: Feb 2022
- Lead investor: 40%
- Last updated: Aug 2026

Mark Mastrov is a Series A investor in Carlsbad focused on Fitness and Health Care. Mark S. Mastrov is based out of Carlsbad, California and is the Owner and Executive Chair of 24 Hour Fitness. Mark previously worked at Netpulse as a Board Member. Mark S. Mastrov attended the California State University.

## Contacts

5 contacts available for Mark Mastrov: 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/mark-mastrov?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Series A | $19M–$19M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Fitness | 3 | 60% |
| Health Care | 3 | 60% |
| Apps | 1 | 20% |
| Gaming | 1 | 20% |
| Wellness | 1 | 20% |

7 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 3 | 60% |
| Seed | 1 | 20% |
| Venture - Series Unknown | 1 | 20% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 3 | 60% |
| Canada | 2 | 40% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Aviron Interactive | Aviron Interactive is a fitness company offering a rower with gamification features. It is a connected rowing machine designed with the user in mind. Short, high-intensity workouts save time, high resistance settings allow to include strength training along with cardio workout, and hundreds of content options to get motivated and keep engaged monthafter month. | $18.6M | Series A | Feb 23, 2022 | https://avironactive.com |
| Aviron | Aviron Ltd engages in the research and development of specific antiviral agents against chronic Hepatitis C Virus (HCV) infection. The company has strategic alliances with CHEMRAR Hi-Tech Center, Chemical Diversity Research Institute, and DRUGS TECHNOLOGY, Ltd. Aviron Ltd was founded in 2010 and is based in Moscow, Russian Federation. | $18.5M | Series A | Feb 23, 2022 | http://avirontextiles.com |
| Sequoia Games | Sequoia Games, Inc. is an officially-licensed sports gaming company, creating games that seamlessly connect physical and digital experiences. FLEX NBA, the company’s first product, is an officially-licensed board game created in partnership with the NBA and National Basketball Players Association. The battle tile game fuses professional sports, thelatest in augmented reality (AR) technology through the game’s mobile companion app, and a registration system that identifies and tracks ownership of player tiles, called Flexagons. |  | Series A | Dec 10, 2021 | http://www.sequoiagames.com/ |
| Frame Fitness | A developer of a digitally-connected Pilates reformer | $5M | Seed | Dec 01, 2021 | https://www.framefitness.com/ |
| Fitplan | Fitplan partners with an ever-growing team of world-class fitness icons, athletes, and professional trainers. They create exclusive training programs & meal plans that you can access through Fitplan. | $4.5M | Venture - Series Unknown | Sep 09, 2019 | http://www.fitplanapp.com |

5 of 5 investments shown.

## Co-investors
- [Stripes](https://shizune.co/investors/profile/stripesco) — VC Fund, 3 deals together
- [Formic Ventures](https://shizune.co/investors/profile/formic-ventures) — VC Fund, 2 deals together
- [Global Founders Capital](https://shizune.co/investors/profile/global-founders-capital) — VC Fund, 2 deals together
- [KittyHawk](https://shizune.co/investors/profile/kittyhawk-ventures) — VC Fund, 2 deals together
- [Advancit Capital](https://shizune.co/investors/profile/advancit-capital) — VC Fund, 1 deal together
- [Borderless Capital](https://shizune.co/investors/profile/algo-capital) — VC Fund, 1 deal together

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## FAQ

### What does Mark Mastrov invest in?

Mark Mastrov invests primarily in Fitness, Health Care and Apps startups, most often at Series A and 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 Mark Mastrov's check size?

Mark Mastrov typically joins rounds of $19M–$19M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Mark Mastrov participates in.

### How do I contact Mark Mastrov?

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 Mark Mastrov last invest?

The most recent investment recorded for Mark Mastrov closed in Feb 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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