Ed Sim
Founder & Managing Partner at boldstart-ventures
Reviewed Updated Aug 30, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
Founder and Managing Partner of Boldstart Ventures (over $1B AUM), writing $250K-$10M 'day one' checks into technical enterprise founders at pre-seed and seed. Coined 'Inception Investing' — backing founders before they incorporate. Enterprise-only ('no consumer') with board seats spanning Snyk, Protect AI, Blockdaemon, Spectro Cloud, and SecurityScorecard. Ranked No. 1 seed investor on Business Insider's Seed 100 in 2023 and 2024.
Background
Ed Sim is the founder and managing partner of Boldstart Ventures, a New York–based venture firm that has grown from a $1M initial fund in 2010 to over $1B in assets under management 1 2. He holds a BA in Economics from Harvard College and began his career at J.P. Morgan building quantitative trading models 1.
Prior to Boldstart, Sim co-founded Dawntreader Ventures, where he led early investments in Greenplum, GoToMeeting, and LivePerson 1. In 2017 he also co-founded MState, an enterprise blockchain lab launched in partnership with IBM, whose seed portfolio included Fireblocks 1 2.
Sim has been named to the Forbes Midas Seed List multiple times and was ranked the No. 1 seed investor in Business Insider’s Seed 100 for both 2023 and 2024 1 2. He also authors “What’s 🔥 in AI/Infra/VC,” a newsletter on enterprise infrastructure and venture capital 1.
Stated Thesis
Boldstart publicly describes itself as a “day one” partner for technical enterprise founders, investing “at inception—helping the bold start” 1. Sim has coined and systematized the term “Inception Investing,” which the firm defines as backing highly technical founders “before they even incorporate or name their companies,” with round sizes not constrained by traditional pre-seed or seed labels 2.
Sim prefers the term “day one partner” over “seed-stage investor,” emphasizing his focus on becoming a company’s very first check 2. He has stated he looks for technical founders who are “more steak than sizzle” 2.
The firm’s stated focus areas are “AI-native infrastructure, security, apps, and models” 3.
Inferred Thesis
Based on 46 investments visible on Sim’s Signal NFX profile (out of 92 total on record), his behavior aligns closely with his stated thesis: near-exclusive focus on enterprise software, developer tools, cybersecurity, and AI infrastructure at the earliest stages 4.
Stage distribution (from 8 recent verified rounds on Signal NFX): - Seed: 5 of 8 (63%) — Baz, Humanix, Uare.ai, Keycard, Grepr - Series A: 2 of 8 (25%) — Surf AI, Waldo - Series B: 1 of 8 (13%) — Hypernative
Sim’s core practice is seed and pre-seed leadership, with follow-on into Series A and later stages of existing portfolio companies 4.
Sector distribution: Sim’s Signal profile explicitly states “All enterprise all the time - no consumer” 4. His current board seats (Snyk, Protect AI, Keycard AI, Surf AI, Tessl, Hypernative, Blockdaemon, Spectro Cloud, SecurityScorecard, Front, Clay, Generalist, Topos Bio) are concentrated in cybersecurity, AI infrastructure, and developer tools 1 2.
Check sizes: Signal reports a check-size range of $250K–$10M with a “sweet spot” around $1M — small enough to lead pre-incorporation rounds while retaining capacity to write follow-on checks 4.
Notable exits: Kustomer (acquired by Meta), Superhuman (acquired by Grammarly), Protect AI (acquired by Palo Alto Networks) 1.
Sample size caveat: This analysis covers 8 rounds with confirmed stage data; Sim has 92 total investments on record 4. Percentages above should be treated as directional for the recent portfolio only.
Portfolio
| Company | Year | Stage | Source |
|---|---|---|---|
| Snyk | 2016 | Seed (led) | 5 2 |
| BigID | ~2016 | Seed | 1 2 |
| Blockdaemon | ~2018 | Early | 1 2 |
| Kustomer | ~2015 | Seed | 1 |
| Superhuman | ~2015 | Seed | 1 |
| SecurityScorecard | ~2014 | Seed | 1 |
| Front | ~2014 | Seed | 1 |
| Fireblocks | ~2018 | Seed (via MState) | 1 |
| Env0 | ~2019 | Seed | 2 |
| Protect AI | ~2022 | Seed | 1 |
| Clay | 2024 | Series | 1 |
| Topos Bio | 2024 | Seed | 1 |
| Generalist | 2024 | Seed | 1 |
| Tessl | 2024 | Seed | 1 |
| Hypernative | 2025 | Series B | 4 |
| Waldo | 2025 | Series A | 4 |
| Keycard | 2025 | Seed | 4 |
| Uare.ai | 2025 | Seed | 4 |
| Humanix | 2025 | Seed | 4 |
| Grepr | 2025 | Seed | 4 |
| Surf AI | 2026 | Series A | 4 |
| Baz | 2026 | Seed | 4 |
Portfolio coverage: This table lists 22 of 92 recorded investments (~24%). Boldstart’s active portfolio is larger; entries here are those verified via multiple sources.
In Their Own Words
On decision speed and founder assessment:
“It’s the ones where within the first two or three minutes, you’re just like, holy shit, this is ready to go.” 2
On what matters in a founder pitch:
“If you start talking to me in markets and — I don’t give a shit. I’m not interested in that. I want to understand about the user. How are you going to make their life 10 to 100 times better.” 2
On the reward of early-stage investing:
“Just seeing the smiles on their faces, that, to me, is why we do it over and over again.” 2
What Founders Say
No independently sourced founder testimonials found. Boldstart’s website republishes press coverage of Sim 1 2, but public first-person quotes from Boldstart portfolio founders about working with Sim specifically were not located in this research pass.
Sources
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Boldstart Ventures, “Ed Sim — Team page,” accessed August 2026. https://boldstart.vc/team/ed-sim/↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩
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Boldstart Ventures, “Ed Sim got into venture capital by answering a newspaper ad. Today he’s the industry’s No. 1 seed investor (Business Insider republished),” accessed August 2026. https://boldstart.vc/news/ed-sim-got-into-venture-capital-by-answering-a-newspaper-ad-today-hes-the-industrys-no-1-seed-investor-insider/↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩
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Boldstart Ventures homepage / portfolio page, accessed August 2026. https://boldstart.vc/portfolio/↩
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Signal by NFX, “Ed Sim investor profile,” accessed August 2026. https://signal.nfx.com/investors/ed-sim↩↩↩↩↩↩↩↩↩↩↩↩↩
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TechCrunch, “Snyk snares $7 million investment to help developers secure open source code,” March 6, 2018. https://techcrunch.com/2018/03/06/snyk-snares-7-million-investment-to-help-developers-secure-open-source-code/↩