United States · 
Who invested in GrayBug?
GrayBug's investors include Maryland Venture Fund and Hatteras Venture Partners.
20142015
$1.5MSeries A$750KVenture$1.7MSeries AUnited States · Series A startup
Who invested in GrayBug
3 rounds we have observed, with the 2 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Funding summaryUpdated 26 Oct 2026
$4.0Mraised across 3 rounds since 2013, from 3 sources
$1.5MSeries A$750KVenture$1.7MSeries A
- Latest round
- Series A, $1.7MMar 2015
- Step-upi
- 2.3×
- Investors
- 2
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $1.5M Oct 2013
- Biggest round
- $1.7M Series A · Mar 2015
- Usual gap between rounds
- 11 months the median of 2
The rounds
- Mar 2015Series A$1.7M1 new1 returning
From a historical funding recordSEC filing: $1.7M sold, first sale Feb 2015
- Oct 2014Venture$750K
No investor was named in the report.
From a historical funding recordSEC filing: $750K sold, first sale Aug 2014
- Oct 2013Series A$1.5M1 new
Reported by pevc.dowjones.comSEC filing: $1.5M sold, first sale Sept 2013
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about GrayBug
How much has GrayBug raised?
GrayBug has raised $4.0M across 3 rounds since 2013.
When did GrayBug last raise?
GrayBug's most recent round was a Series A of $1.7M in Mar 2015.
What was GrayBug's biggest round?
Its most recent round, $1.7M in Mar 2015, is also its largest on record.
Who backed GrayBug first?
GrayBug's first round on record, in Oct 2013, was backed by Maryland Venture Fund.
What stage is GrayBug at?
GrayBug's latest named round is a Series A, in Mar 2015.
Where is GrayBug based?
GrayBug is based in the United States.
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