# Tammie Siew

> Tammie Siew is a General Partner and Co-Founder at Pebblebed, a San Francisco-based deep tech venture capital firm focused on foundational infrastructure—AI simulation engines, robot operating systems, developer platforms, and formal verification systems. A Cornell-educated economist and literature scholar who spent years investing at Sequoia Capital Singapore before co-founding a healthcare startup, she brings a rare operator-investor lens to backing the infrastructure layer of next-generation technology. Pebblebed's Fund II closed at $125M in 2024, with roughly 35 investments backing companies like Augment Code, OpenMind, Zeromatter, Lemurian Labs, and Logical Intelligence.

- **Role:** General Partner at Pebblebed
- **Organizations:** Pebblebed, Revery, Sequoia Capital, B Capital Group, BCG, GSR Ventures
- **Nationality:** Singaporean
- **Education:** Bachelor of Arts with Distinction — Economics and English Literature (minor: Business), Cornell University, GCE Advanced Levels (Humanities Scholarship), Hwa Chong Institution
- **Known for:** Co-founded Pebblebed, raising $125M in Fund II by 2024, Built and led Pebblebed to 35+ portfolio investments across AI, robotics, biotech, and simulation, Invested at Sequoia Capital Singapore covering venture through late-stage deals

## Career timeline

- **2017-2018** — Management Consulting at PwC and BCG — fintech incubation, eSports strategy, sales tooling
- **2018-2020** — Investor at Sequoia Capital Singapore — venture, growth, and late-stage investments
- **2020-2021** — Published reflections on Sequoia years; joined B Capital Group investment team
- **2021-2022** — Co-founded Revery — healthcare tech startup using gamified CBT for mental health and wellness
- **2022** — Left Revery to co-found Pebblebed, returning to VC with operator experience
- **2022-2024** — Deployed Pebblebed Fund I — seed and pre-seed investments in deep tech infrastructure
- **2024** — Pebblebed Fund II closes at $125M — expands to 35+ portfolio companies
- **2025-2026** — Active portfolio building; latest investment Cognee Series A (Feb 2026)

## Achievements

- Co-founded Pebblebed, raising $125M in Fund II by 2024
- Built and led Pebblebed to 35+ portfolio investments across AI, robotics, biotech, and simulation
- Invested at Sequoia Capital Singapore covering venture through late-stage deals
- Co-founded Revery, a healthcare technology startup focused on gamified cognitive behavioral therapy
- Selected portfolio includes Augment Code, OpenMind, Zeromatter, Lemurian Labs, Logical Intelligence, Northflank, and Orchid
- Organized AI x Biotech Hiring Showcase connecting founders with technical talent

## Latest updates

- **2026-02** — Pebblebed leads investment in Cognee Series A
- **2024-08** — Pebblebed Fund II announced at $125M
- **2024** — Portfolio reaches 35 total investments across AI, robotics, biotech, and simulation sectors

## Links

- Website: https://pebblebed.com
- LinkedIn: https://www.linkedin.com/in/tammie-siew/
- Twitter/X: https://x.com/tammiesiew
- Instagram: https://www.instagram.com/tammie.siew/

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Profile page: https://yespress.io/tammie-siew
Published by YesPress — https://yespress.io
Last updated: 2026-05-17