United States · Venture startup
5 rounds we have observed, with the 19 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
$181Mraised across 5 rounds since 2000, from 5 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
From a historical funding recordSEC filing: $200K sold, first sale Oct 2013
Commons Capital
Conduit Ventures
Parker HannifinFrom a historical funding record
From a historical funding record
Intel Capital
Matrix Partners
North Bridge Venture Partners & Growth Equity
Oak Investment Partners
Essex Investment ManagementFrom a historical funding record
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Intel CapitalMatrix PartnersNorth Bridge Venture Partners & Growth Equity
In-Q-TelOak Investment Partners
3i Group
J.P. Morgan Securities Inc.
Boston Millennia Partners
Castile VenturesSAS InvestorsFrom historical deal records. Wrong? Tell us.
Missing a round, or an investor who was in one? Tell us.
Protonex Technology Corporation's investors include Intel Capital, Matrix Partners, North Bridge Venture Partners & Growth Equity, In-Q-Tel and Oak Investment Partners, and 14 more on record.
Protonex Technology Corporation has raised $181M across 5 rounds since 2000. One round did not disclose an amount, so the total is a floor.
Protonex Technology Corporation's most recent round was a Venture in Sept 2013.
Protonex Technology Corporation's largest round on record is $90M (Series C), in Oct 2001.
Protonex Technology Corporation's first round on record, in Nov 2000, was backed by Intel Capital, Matrix Partners and North Bridge Venture Partners & Growth Equity and 2 others.
Protonex Technology Corporation's latest named round is a Venture, in Sept 2013.
Protonex Technology Corporation is based in the United States.
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