Andy Sack
Venture Partner @ Founders' Co-op
Seattle, United States
Andy Sack is a seed investor at Founders' Co-op in Seattle focused on Software and Finance. Andy Sack has over 15 years experience running and investing in high tech businesses, most recently as co-founder and CEO of Judy's Book, a local search social network.Prior to founding Judy's Book in 2004, Andy co-founded three successful Internet technology companies: Kefta (acquired in 2007 by Axciom), a leading provider of realtime customer interaction solutions; Abuzz, (acquired by New York Times Digital in 1999), an enterprises knowledge management solution named number one in the Internet software category by Red Herring Magazine and the top company to work for by Boston Magazine; and Firefly Network, an Internet company that pioneered internet personalization technologies (acquired by Microsoft). Andy also spent time as an entrepreneur in residence for SOFTBANK Venture Capital (now Mobius VC) where he founded and served on the board of three companies: BodyShop Digital, Quova, and Kefta.Andy currently serves on the board of and advises a number of companies including: zango, Cooler Planet, and Orange Line Media. Andy was also a founder and board member of Students for Responsible Business, and is a regular lecturer at the University of Washington Business School.Andy received his undergraduate degree from Brown University in 1990, and his MBA from the Sloan School of Management at MIT. Andy lives in Laurelhurst with his wife and two children.
- Total investments:
- 85
- Last investment:
- Lead investor:
- 14%
Last updated:
For AI agents: llms.txt
Industries Andy Sack invests in
Stages Andy Sack invests in
Countries Andy Sack invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $18k–$1.8M
- Pre-Seed
- $118k–$250k
- Series A
- $500k–$6M
Investment Focus
Industry
- Software 15 (18%)
- Finance 13 (15%)
- SaaS 11 (13%)
- Mobile 10 (12%)
- Analytics 10 (12%)
Stage
- Seed 45 (53%)
- Pre-Seed 12 (14%)
- Series A 7 (8%)
- Angel 3 (4%)
- Funding Round 1 (1%)
Country
- United States 57 (67%)
- Canada 1 (1%)
- Israel 1 (1%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Me4U
|
Me4U is an AI platform that enables creators to engage and monetize their fanbase. It features real conversations with the authorized AI clone of favorite celebrity creators. | $750K / Angel / Aug 29, 2023 | |
Inflection.io
|
Inflection.io is a venture-backed product company that builds marketing technology to power product-led growth. | $5M / Seed / May 18, 2022 | |
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Inflection.io
|
Inflection.io is a venture-backed product company that builds marketing technology to power product-led growth. | $5M / Seed / May 18, 2022 | |
SkillMagic
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SkillMagic's AI finds the best learning from the entire Internet and re-organizes it so anyone can learn anything efficiently. | Pre-Seed / Jan 01, 2021 | |
Pienza
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Pienza is ideate, fund, and build SaaS unicorns with high conviction and high time & capital concentration. | $5.1M / Seed / Dec 08, 2020 | |
Reflective
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Reflective is an app that guides and automates work. | $1.3M / Seed / Aug 18, 2020 | |
Decent
|
Decent offers more affordable healthcare by aligning incentives to improve health, reduce costs, and put members at the center of their care. | $8M / Seed / May 18, 2018 | |
MightySignal
|
MightySignal was acquired in a two part acquisition. Xenon Partners acquired the business and Instacart acquired the team.MightySignal is a mobile application index that enables businesses to make sense of data patterns generated by mobile app companies. The company filters for applications through a web portal in order to gather behavioral dataand offer understandable analytics through an API.MightySignal was founded by Jason Lew and Shane Wey in 2014 and is based in San Francisco, California. | $1.2M / Seed / Feb 03, 2015 | |
FORWARD Platform
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FORWARD is an Integrated Program Administration solution that helps governments and non-profits administer resources to communities quickly, securely, and equitably. | $120K / Seed / Aug 11, 2014 | |
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FORWARD Platform
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FORWARD is an Integrated Program Administration solution that helps governments and non-profits administer resources to communities quickly, securely, and equitably. | $120K / Seed / Aug 11, 2014 | |
| See all 85 investments → | |||
Co-Investors
About Founders' Co-op
Founders' Co-op is a seed-stage venture fund built by founders, for founders. Based in Seattle, they help the strongest entrepreneurs in the Pacific Northwest build companies that the best growth investors in the world choose to back. As the largest and longest-running seed-stage specialist fund in the region, they are a trusted partner toearly-stage founders and a trusted point of access to Pacific Northwest dealflow for out-of-region investors at the seed stage and beyond.
Founders' Co-op Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Aviel Ginzburg
General Partner
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Rudy Gadre
General Partner, Fund III
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Andy Sack
Venture Partner
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Chris DeVore
Founding Managing Partner
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Chris DeVore
Founding Managing Partner
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FAQ
What does Andy Sack invest in?
Andy Sack invests primarily in Software, Finance and SaaS startups, most often at Seed and Pre-Seed stage. Most of the 85 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 Andy Sack's check size?
Andy Sack typically joins rounds of $18k–$1.8M at Seed, $118k–$250k at Pre-Seed and $500k–$6M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Andy Sack participates in.
How do I contact Andy Sack?
Public channels for Andy Sack 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 Andy Sack last invest?
The most recent investment recorded for Andy Sack closed in Aug 2023. Shizune tracks 85 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 Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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