Quiet Capital
VC Fund
San Francisco, United States
Quiet Capital is a technology investment firm.
- Total investments:
- 500
- Last investment:
- Lead investor:
- 9%
- Fund size:
- $6.3M
- Last fund:
Last updated:
For AI agents: llms.txt
Industries Quiet Capital invests in
Stages Quiet Capital invests in
Countries Quiet Capital invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
| See all 11 contacts → | |||
Round size
- Seed
- $1.8M–$15M
- Series A
- $9.8M–$43M
- Series B
- $23M–$76M
Investment Focus
Industry
- Software 132 (26%)
- Artificial Intelligence 77 (15%)
- FinTech 62 (12%)
- Financial Services 56 (11%)
- Information Technology 49 (10%)
Stage
- Seed 213 (43%)
- Series A 97 (19%)
- Series B 57 (11%)
- Pre-Seed 40 (8%)
- Series C 26 (5%)
Country
- United States 315 (63%)
- United Kingdom 12 (2%)
- Canada 7 (1%)
- India 6 (1%)
- Pakistan 4 (1%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
David Greenbaum
Partner
|
Partner | Total investments: 5 | Find email | |
Ben Mahdavi
Managing Partner
|
Managing Partner | Total investments: 1 | Find email | |
|
Chris Capozzi
Partner & Chief Financial Officer
|
Partner & Chief Financial Officer | Total investments: 0 | Find email | |
Daniel Gruneberg
Partner
|
Partner | Total investments: 0 | Find email | |
Jeff Silverstein
Venture Partner
|
Venture Partner | Total investments: 4 | Find email | |
| See all 11 team members → | ||||
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Biossil is an applied AI drug discovery platform to create specialized treatments for distinct patients. | $153M / Venture - Series Unknown / Sep 28, 2026 | ||
| Quartermaster AI is a defense technology company that develops real-time distributed marine software via AI robot technology. | $100M / Series B / Sep 28, 2026 | ||
| Polyphron builds an autonomous tissue foundry platform for scalable, reproducible human tissue manufacturing. The company uses induced pluripotent stem cells, AI models, and automation to engineer graftable human tissues across cortical, cardiac, and other tissue contexts. Its platform integrates developmental single-cell atlases, high-throughput3D tissue experiments, and active learning to optimize tissue structure and polarity. Polyphron develops biomanufacturing systems for difficult-to-produce proteins, high-fidelity safety and efficacy screening tissues, and immune-compatible iPSC-derived grafts intended to restore tissue function and support regenerative medicine applications. | $20M / Seed / Sep 17, 2026 | ||
| Thatch helps businesses give great healthcare to their employees. | $108M / Series C / Sep 15, 2026 | ||
| The next great music platform won’t look like Spotify or Ableton. That’s the bet.A Vinyl Bar in Shibuya is a “music (software) label” – we release playful music products built on a core belief: music is a verb – something you do, not passively stream. We're on a mission to pull people into a deeper relationship with music, and we'rebuilding the next great consumer music app to do it.We’re a small but mighty team of creative technologists, assembled by Máuhan M Zonoozy (ex-Head of Innovation at Spotify, 2x exits), and backed by investors who uniquely get it, including NFX, Mantis, Quiet Capital, Collaborative Fund, Gold House, BoxGroup, SV Angel, RRE, and others. $9M+ raised | $5.5M / Pre-Seed / Sep 14, 2026 | ||
| RWX is a software company that builds tools for optimizing reliability, building, test performance, and developer experience. | $12M / Series A / Aug 04, 2026 | ||
| Intropy AI offers AI tools that automate sales coaching, lead generation, pricing, and ERP tasks for parts businesses. | $11M / Seed / Jul 30, 2026 | ||
| Assort Health is building healthcare that remembers.From call center automation and form intake to referrals, document processing, outreach, and payments, we manage the entire patient journey for providers. Our platform is the most widely used AI agents platform for the patient journey, built on 180 million specialty patient interactions and amodel that handles the complexity general-purpose AI can’t.Healthcare organizations see a 5% lift in appointment volume, a 115% increase in labor capacity, and a 4.3 out of 5 patient satisfaction score.With over $222M raised from Menlo Ventures, Lightspeed, First Round Capital, Apolo Ohno, and Joe Montana, Assort is becoming the standard for how providers use AI to transform the patient journey.Learn more at assorthealth.com | $120M / Series C / Jun 24, 2026 | ||
| Suno is a music start-up that enables anyone to make the songs they want. The company aims to help people rediscover the joy of play and exploration. | $400M / Series D / Jun 03, 2026 | ||
| NewLimit specializes in treating age-related diseases to extend the human health span. It works on developing epigenetic reprogramming medicines to treat diseases with large unmet needs. | $435M / Series C / Jun 02, 2026 | ||
| See all 500 investments → | |||
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FAQ
What does Quiet Capital invest in?
Quiet Capital invests primarily in Software, Artificial Intelligence and FinTech startups, most often at Seed and Series A stage. Most of the 500 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 Quiet Capital's check size?
Quiet Capital typically joins rounds of $1.8M–$15M at Seed, $9.8M–$43M at Series A and $23M–$76M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Quiet Capital participates in.
How do I contact Quiet Capital?
Public channels for Quiet Capital 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.
Who are the partners at Quiet Capital?
The team at Quiet Capital includes David Greenbaum (Partner), Ben Mahdavi (Managing Partner) and Chris Capozzi (Partner & Chief Financial Officer), among 11 team members tracked by Shizune. The Team section lists each member with their title, investment count and links.
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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