Michael Stoppelman
Angel Investor
Greater Los Angeles Area, United States
Michael Stoppelman is an active angel/seed investor in Los Angeles. He's the former Senior Vice President of Engineering at Yelp. He started at Yelp as a software engineer working on the search engine. He took over as head engineering in 2012 after serving as a manager and Director of Engineering in the proceeding years. He scaled theengineering team from 30 to over 500 engineers. Prior to Yelp he was a software engineer at Google for 3.5 years and served as the tech lead for the AdSense Traffic Quality team. He received his BS in Computer Science from Purdue in West Lafayette, Indiana in 2003.
- Total investments:
- 58
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Michael Stoppelman invests in
Stages Michael Stoppelman invests in
Countries Michael Stoppelman invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $1.6M–$8M
- Pre-Seed
- $770k–$5M
- Series A
- $5M–$15M
Investment Focus
Industry
- Software 30 (52%)
- Artificial Intelligence 15 (26%)
- SaaS 13 (22%)
- Information Technology 13 (22%)
- Internet 11 (19%)
Stage
- Seed 36 (62%)
- Series A 10 (17%)
- Pre-Seed 5 (9%)
- Series B 4 (7%)
- Angel 3 (5%)
Country
- United States 46 (79%)
- United Kingdom 4 (7%)
- India 1 (2%)
- Israel 1 (2%)
- Australia 1 (2%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Siro builds an AI Coach that identifies opportunities to elevate any sales team. Siro records reps’ in-person conversations and highlights the most critical moments to let reps hear how top performers handle difficult customer objections and empower coaches to support reps to a degree never before possible. The majority of the 5.7 million salesprofessionals in the U.S. work in field sales (i.e., any sales process involving a handshake), but most receive ZERO on-the-job coaching because it is too time-intensive. The company believes that with the right tooling, Field Sales can become the most accessible path to financial freedom. | $50M / Series B / May 21, 2025 | ||
| Tensor9 is a data security company. Tensor9 helps software and AI vendors run their products inside their customer's cloud — so sensitive customer data stays private. For vendors, this unlocks customers that can't share sensitive data. | $4M / Seed / May 14, 2025 | ||
| Hostie is an AI-first customer experience platform designed for restaurants, automating guest inquiries, reservations, and takeout orders. We proudly partner with some of the world’s top restaurants, including Flour + Water, Nisei, Slanted Door, ILIS, and more. Co-founded by a product designer-turned-restaurateur and an AI engineer, Hostie blendshospitality expertise with cutting-edge technology to enhance restaurant operations. | $4M / Seed / Apr 29, 2025 | ||
| Practice English with AI on WhatsApp and video-calling | $1.5M / Seed / Jan 15, 2025 | ||
| Hamming AI is an experimentation platform that helps teams build reliable AI products. | $3.8M / Seed / Dec 18, 2024 | ||
| Open Source Python framework that enables AI Engineers to focus on modeling and experimentation. | $5.5M / Seed / Dec 05, 2024 | ||
|
Integrated Biosciences
|
Integrated Biosciences is the first company in history to be able to virtually stress cells. | $17.2M / Seed / Oct 03, 2024 | |
| Arcjet helps developers protect their apps in just a few lines of code. Implement rate limiting, bot protection, email validation, and defense against common attacks. | $3.6M / Seed / Sep 10, 2024 | ||
| Slingshot is an AI research company driven by our mission to exponentially increase global access to mental healthcare.We’re developing technology to help humans feel and perform better, be more connected, and adapt to the future in a time where the demand for mental health support far exceeds providers by 10,000:1, and the large-scale changesahead are unprecedented.By leveraging AI to delve deep into human psychology, we expect to learn something about human nature that no humans have before, in order to help people change their minds.Based in NYC and London, our cross-disciplinary team of researchers, engineers, and broader mental health experts is dedicated to building tools that empower individuals to take on any challenge that arises. | $30M / Seed / Aug 20, 2024 | ||
| Hyperbound is a simulated AI Sales Roleplay platform that turns ICP descriptions into interactive AI buyers in less than 2 minutes. It helps your sales team onboard 50% faster and boosts your team's conversions on cold, warm, & discovery calls.Every sales team wants to do more roleplays, but it's often unscalable and biased. Insteadof having your sellers practice on real prospects and burn leads in the process, Hyperbound allows your reps to get realistic at-bats with an AI buyer. Sellers can finally gain call confidence and mastery in a simulated environment that doesn't put your pipeline at risk and gives time back to your managers. Interested in trying it out today? Start a free demo simulation at hyperbound.ai and contact us at founders@hyperbound.ai for next steps. | $3.3M / Seed / Sep 06, 2023 | ||
| See all 58 investments → | |||
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FAQ
What does Michael Stoppelman invest in?
Michael Stoppelman invests primarily in Software, Artificial Intelligence and SaaS startups, most often at Seed and Series A stage. Most of the 58 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does Michael Stoppelman invest in?
Michael Stoppelman typically joins rounds of $1.6M–$8M at Seed, $770k–$5M at Pre-Seed and $5M–$15M at Series A. These are whole funding-round sizes, not Michael Stoppelman's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Michael Stoppelman took part in.
How do I contact Michael Stoppelman?
Public channels for Michael Stoppelman include LinkedIn and Facebook. 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 Michael Stoppelman last invest?
The most recent investment recorded for Michael Stoppelman closed in May 2025. Shizune tracks 58 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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