Alex Rainert
Angel Investor
New York, United States
Alex Rainert is a founder of In 2009, he joined former Dodgeball co-founder Dennis Crowley's newstartup, Foursquare as head of product. In late 2013, he left Foursquare. In February 2014 he joined Project Florida as Head of Design.
- Total investments:
- 2
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Alex Rainert invests in
Stages Alex Rainert invests in
Countries Alex Rainert invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
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Investment Focus
Industry
- Mobile Advertising 2 (100%)
- Private Social Networking 2 (100%)
- Apps 1 (50%)
- Guides 1 (50%)
- Content 1 (50%)
Stage
- Seed 1 (50%)
- Series A 1 (50%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Timehop offers Nimbus, a mobile, and in-app header bidding solution. | $1.1M / Seed / Jan 24, 2012 | ||
| Foursquare is a location technology platform offering business solutions and consumer products through a deep understanding of location.As a location intelligence company, Foursquare is comprised of two well-known consumer apps, Foursquare and Swarm, as well as thriving media and enterprise products. The platform leverages a deep understanding oflocation intelligence to unlock valuable insights about customers, enabling brands to understand and connect to targeted audiences as well as to measure foot traffic and advertising success. Its toolkit includes Foursquare Analytics; Placed powered by Foursquare; Pinpoint audiences; and Pilgrim SDK and Places API. Together, these products empower brands to analyze trends; measure foot traffic lift via multi-touch attribution; optimize advertising campaigns across hundreds of audiences; and drive deeper engagement via Foursquare’s industry-leading developer tools.Co-founders Dennis Crowley and Naveen Selvadurai established the company in New York, New York in 2009. | $1.4M / Series A / Sep 04, 2009 |
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FAQ
What does Alex Rainert invest in?
Alex Rainert invests primarily in Mobile Advertising, Private Social Networking and Apps 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 Alex Rainert?
Public channels for Alex Rainert include LinkedIn, X (Twitter) and the website linked on this profile. 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 Alex Rainert last invest?
The most recent investment recorded for Alex Rainert closed in Jan 2012. 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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