# Mayer Gniwisch

> Mayer Gniwisch is a seed investor at OTV backing Internet and Shopping. See 5 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Fund: [OTV](https://shizune.co/investors/profile/olive-tree-ventures)
- Location: Montréal, Canada
- Total investments: 5
- Last investment: Jul 2022
- Lead investor: 40%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/mayer-gniwisch-174a2/

Mayer Gniwisch is a seed investor at OTV in Montréal focused on Internet and Shopping. Mayer was classically trained as a diamond cutter with one of South Africa's largest diamond companies. He then founded First Canadian Diamond Cutting Works, the first diamond factory in Canada. He also created Y&M Diamond Trading of New York, a leading seller of loose diamonds.With his experience, Mayer brings a very strong qualityand value perspective to his responsibilities and strongly believes his personal mission is to provide "the customer with the best quality and value for each and every diamond or piece of jewelry they acquire."

## Contacts

5 contacts available for Mayer Gniwisch: 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/mayer-gniwisch-2?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Internet | 1 | 20% |
| Shopping | 1 | 20% |
| Software | 1 | 20% |
| E-Commerce | 1 | 20% |
| Marketplace | 1 | 20% |

11 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 2 | 40% |
| Series A | 2 | 40% |
| Pre-Seed | 1 | 20% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Israel | 1 | 20% |
| United States | 1 | 20% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| HATCH | HATCH is the first of its kind Giving Intelligence Platform. An AI-powered portal for Fundraisers, Marketers and Volunteers to streamline and Maximize their impact. A new home for a new world of giving! HATCH unifies expanded-data to create the complete human profile and applies proprietary algorithms to recommend the most timely, personalized andeffective methods of outreach. For the first time, you’ll know what makes your donors, customers, and employees tick, click and give. | $1.2M | Pre-Seed | Jul 07, 2022 | http://www.hatch.ai |
| Stor.ai | We understand that the way the world shops is rapidly changing and that every retailer should be able to provide unique and innovative digital experiences to their customers. We believe in retailers being able to do this while owning their customer relationships, their brand, and their data. This is foundation behind why began Stor.AI (formerlySelf Point) and it drives us to constantly innovate and evolve our platform and solutions When you partner with stor.ai, it’s about more than just the tech - you get a team of experts working behind the scenes to help your team maximize the digital marketplace e. Our team has years of experience helping retailers successfully navigate competitive marketplaces, especially from eCommerce and digital angles. Each of us is here to help, serve, and evolve with you. We are dedicated to helping in any way we can and to constantly improving our platform to enable your growth and change and adapt as the digital marketplace also evolves. · Deliver WOW Through Solutions and Service Embrace and Drive Change Working Together – Reaching our common goals Absolute Execution – Strive for excellence. Execute and Deliver Be Adventurous, Creative, and Open-Minded Pursue Growth and Learning Build Open and Honest Relationships Build a Fun Team and Family Spirit Be Passionate and Determined Be Humble | $21M | Series A | Mar 15, 2021 | http://www.stor.ai |
| HARBO Technologies | HARBO Technologies offers the fastest and most effective oil spill first response system in the world. Instead of relying on massive, bulky equipment and a large team of skilled professionals, HARBO’s T-FENCE system can be ready for immediate deployment by as few as two people at the spill source – whether on a vessel, at a port or an oil terminal.As the world’s lightest effective solution, it immediately blocks the spreading of oil spills and can be used even in the most remote locations as it requires minimal logistics. |  | Series A | Jul 01, 2017 | http://www.harbo-technologies.com/ |
| Stor.ai | We understand that the way the world shops is rapidly changing and that every retailer should be able to provide unique and innovative digital experiences to their customers. We believe in retailers being able to do this while owning their customer relationships, their brand, and their data. This is foundation behind why began Stor.AI (formerlySelf Point) and it drives us to constantly innovate and evolve our platform and solutions When you partner with stor.ai, it’s about more than just the tech - you get a team of experts working behind the scenes to help your team maximize the digital marketplace e. Our team has years of experience helping retailers successfully navigate competitive marketplaces, especially from eCommerce and digital angles. Each of us is here to help, serve, and evolve with you. We are dedicated to helping in any way we can and to constantly improving our platform to enable your growth and change and adapt as the digital marketplace also evolves. · Deliver WOW Through Solutions and Service Embrace and Drive Change Working Together – Reaching our common goals Absolute Execution – Strive for excellence. Execute and Deliver Be Adventurous, Creative, and Open-Minded Pursue Growth and Learning Build Open and Honest Relationships Build a Fun Team and Family Spirit Be Passionate and Determined Be Humble | $7.5M | Seed | Oct 31, 2016 | http://www.stor.ai |
| HARBO Technologies | HARBO Technologies offers the fastest and most effective oil spill first response system in the world. Instead of relying on massive, bulky equipment and a large team of skilled professionals, HARBO’s T-FENCE system can be ready for immediate deployment by as few as two people at the spill source – whether on a vessel, at a port or an oil terminal.As the world’s lightest effective solution, it immediately blocks the spreading of oil spills and can be used even in the most remote locations as it requires minimal logistics. |  | Seed | Feb 01, 2016 | http://www.harbo-technologies.com/ |

5 of 5 investments shown.

## Co-investors
- [Kli Capital](https://shizune.co/investors/profile/bnsg-capital) — VC Fund, 2 deals together
- [Tiferes Ventures](https://shizune.co/investors/profile/tiferes-ventures) — VC Fund, 2 deals together
- [Evok Innovations](https://shizune.co/investors/profile/evok-innovations) — VC Fund, 1 deal together
- [Meitav Investment House](https://shizune.co/investors/profile/meitav-investment-house) — VC Fund, 1 deal together
- [Mizrahi Tefahot Bank](https://shizune.co/investors/profile/united-mizrahi-bank) — VC Fund, 1 deal together

## About OTV

VC Fund · Tel Aviv, Israel

OTV is a global digital health fund with offices in Tel Aviv, NYC and Shanghai. The OTV mission is to invest in brilliant entrepreneurs, who are looking to touch the lives of those worldwide who will benefit from their innovative products and services in the digital health arena.

5 contacts available at OTV.

| Name | Title | Profile |
| --- | --- | --- |
| Henry Weinstein | Investment Principal | https://shizune.co/investors/profile/henry-weinstein |
| Jose Antonio Urrutia Rivas | Head of Asia Pacific | https://shizune.co/investors/profile/jose-antonio-urrutia-rivas |
| Alejandro Weinstein | General Partner | https://shizune.co/investors/profile/alejandro-weinstein-2 |
| Amir Lahat | Co-Founder & General Partner | https://shizune.co/investors/profile/amir-lahat |
| Mayer Gniwisch | General Partner | https://shizune.co/investors/profile/mayer-gniwisch-2 |

## Similar investors

### Similar stage
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- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does Mayer Gniwisch invest in?

Mayer Gniwisch invests primarily in Internet, Shopping and Software startups, most often at Seed and Series A stage. Most of the 5 investments tracked by Shizune back companies in Israel. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Mayer Gniwisch?

Public channels for Mayer Gniwisch 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 Mayer Gniwisch last invest?

The most recent investment recorded for Mayer Gniwisch closed in Jul 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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