United States · Venture startup
8 rounds we have observed, with the 12 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
$503Mraised across 8 rounds since 2005, from 8 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
No investor was named in the report.
Reported by masshightech.comSEC filing: $50M sold, first sale May 2012
Reported by ir.a123systems.comSEC filing: $69M sold, first sale Apr 2009
Reported by pehub.comSEC filing: $69M sold, first sale Apr 2009
Sequoia Capital
North Bridge Venture Partners & Growth Equity
Qualcomm
GE Ventures
Motorola Solutions Venture Capital
Massachusetts Institute of TechnologyReported by mitsloanblog.typepad.com
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
GE VenturesSequoia Capital
US Department of EnergyNorth Bridge Venture Partners & Growth EquityQualcommMotorola Solutions Venture CapitalEspírito Santo Ventures
Madison Parker CapitalProcter & GambleMassachusetts Institute of TechnologyFrom historical deal records. Wrong? Tell us.
Missing a round, or an investor who was in one? Tell us.
These 2 firms list A123 Systems as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
A123 Systems's investors include GE Ventures, Sequoia Capital, US Department of Energy, North Bridge Venture Partners & Growth Equity and Qualcomm, and 7 more on record.
A123 Systems has raised $503M across 8 rounds since 2005.
A123 Systems's most recent round was a Venture of $50M in Jun 2012.
A123 Systems's largest round on record is $249M (Grant), in Aug 2009.
A123 Systems's first round on record, in Feb 2006, was backed by Madison Parker Capital.
A123 Systems's latest named round is a Venture, in Jun 2012.
A123 Systems is based in the United States.
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