Justine Chiou is a Managing Director at William Blair, whose known portfolio counts 8 companies.
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Investment focus
Contacts
Affiliated funds' portfolios
Managing Director at William Blair, whose known portfolio counts 8 companies
- Prime Trust
- Inuvo
- Xan3D Technologies
- Halo Investing
- HouseValues
- Athersys
- NuVasive
- TargeGen
Investor Profile
Founders in the listed sectors FinTech, Hardware and Healthcare, and focus areas Biotech, Crypto, Healthcare Operations and MedTech fall inside that listing.
William Blair appears in Growth, Late-Stage and Seed rounds across its known deals.
What the affiliated firm has backed is the closest available signal on whether Justine Chiou is worth approaching.
Colleagues at William Blair
Delaney Brown
Senior Director
London, United Kingdom
Pierre Horvilleur
Investor
Miami Beach, United States
Rob Metzger
Senior Director
Chicago, United States
Michael Tanner
Vice President
Chicago, United States
Brandon Lawrence
Vice President
New York, United States
Ron Mitra
Financial Advisor
Darien, United States
Evan Kornack
Managing Director
Wellesley, United States
Tom Lewis
Managing Director
London, United Kingdom
John Poth
Investment Banking
Chicago, United States
Jeff Hypes
Managing Director
Chicago, United States
Frequently asked questions
Who is Justine Chiou?
Justine Chiou is a private equity investor and venture debt investor based in Chicago, Illinois, United States, listed as Managing Director at William Blair. The known portfolio of that firm counts 8 companies. That portfolio belongs to the firm, not to Justine Chiou personally.
What does Justine Chiou invest in?
Listed sectors include FinTech, Hardware and Healthcare; listed focus areas include Biotech, Crypto, Healthcare Operations and MedTech. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Justine Chiou invest at?
William Blair appears in Growth, Late-Stage and Seed rounds across its known deals, and Justine Chiou is listed there as Managing Director. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Justine Chiou listed at?
Justine Chiou is listed as Managing Director at William Blair. 10 other people in the database share a firm with Justine Chiou.
How do I contact Justine Chiou?
An email address, a phone number and a LinkedIn page are on file for Justine Chiou. The address stays masked on this page and is readable inside RaiseHunt after you create an account.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal