United States · Series D startup

Who invested in NanoOpto

3 rounds we have observed, with the 11 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.

Biotech

Funding summaryUpdated 26 Oct 2026

$24Mraised across 3 rounds since 2003, from 3 sources

$7.0MSeries B$12MSeries C$5.0MSeries D

Latest round: Series D, $5.0MJun 2006
Biggest round: $12MSeries C · Mar 2005
Investors: 11

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

200420052006

$7.0MSeries B$12MSeries C$5.0MSeries D

First round: Series B, $7.0M
Biggest round: $12M
Usual gap between rounds: 18 months

The rounds

Jun 2006
Series D$5.0M2 new4 returning
Reported by moonlightchannels.com
Mar 2005
Series C$12M3 new2 returning
Reported by azonano.com
Sept 2003
Series B$7.0M6 new
From a historical funding record

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.

Series B2003Series C2005Series D2006

Morgenthaler VenturesHarris & Harris Group

DFJ

First Analysis

Bessemer Venture Partners

U.S. Venture Partners

ITOCHU Technology VenturesDFJ Gotham Ventures

Gotham Ventures

nav.vc

Everyone who backed them

Morgenthaler VenturesVC firm3rounds

Harris & Harris GroupGrowth equity3rounds

DFJVC firm2rounds

First AnalysisVC firm2rounds

Bessemer Venture PartnersVC firm1round

U.S. Venture PartnersVC firm1round

ITOCHU Technology VenturesVC firm1round

DFJ Gotham VenturesVC firm1round

Gotham VenturesVC firm1round

nav.vcVC firm1round

Excelsior Venture Partners IIIVC firm1round

Missing a round, or an investor who was in one? Tell us.

Quick answers about NanoOpto

Who invested in NanoOpto?

NanoOpto's investors include Morgenthaler Ventures, Harris & Harris Group, DFJ, First Analysis and Bessemer Venture Partners, and 6 more on record.

How much has NanoOpto raised?

NanoOpto has raised $24M across 3 rounds since 2003.

When did NanoOpto last raise?

NanoOpto's most recent round was a Series D of $5.0M in Jun 2006.

What was NanoOpto's biggest round?

NanoOpto's largest round on record is $12M (Series C), in Mar 2005.

Who backed NanoOpto first?

NanoOpto's first round on record, in Sept 2003, was backed by Bessemer Venture Partners, Morgenthaler Ventures and Harris & Harris Group and 3 others.