BEACON POWER CORP

Q: Sep 30 2011

Q: Sep 30 2011

Q: Jun 30 2011

Q: Mar 31 2011

FY: Dec 31 2010

FY: Dec 31 2010

Q: Sep 30 2010

Q: Sep 30 2010

Q: Jun 30 2010

Q: Mar 31 2010

FY: Dec 31 2009

FY: Dec 31 2009

Q: Sep 30 2009

Q: Jun 30 2009

Q: Mar 31 2009

FY: Dec 31 2008

Q: Sep 30 2008

Q: Jun 30 2008

Q: Mar 31 2008

FY: Dec 31 2007

Regulation FD Disclosure

Regulation FD Disclosure

1.01,1.03,7.01,9.01

7.01,9.01

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

1.03,2.04

1.01,3.02,3.03,9.01

3.01,8.01,9.01

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

2.02,9.01

5.07

1.01

Entry into a Material Definitive Agreement

1.01,3.03

Entry into a Material Definitive Agreement

Results of Operations and Financial Condition

2.02,3.01,9.01

5.02,9.01

Other Events

Certification of termination of registration of a class of securities (Section 12(g))

Notification of removal from listing and/or registration on a national securities exchange

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

No description available

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

No description available

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

CAPITAL VENTURES INTERNATIONAL /E9/

SPIEZIO JAMES M

LAZAREWICZ MATTHEW L

CAPP F WILLIAM

Judson Judith

Kletter Daniel E

LAZAREWICZ MATTHEW L

SPIEZIO JAMES M

Judson Judith

CAPP F WILLIAM

GOLDMAN SACHS ASSET MANAGEMENT LP

CAPITAL VENTURES INTERNATIONAL /E9/

Ramius LLC

Kletter Daniel E

SMITH JACK P

Rose Virgil G

Weihman Edward A

Kletter Daniel E

LAZAREWICZ MATTHEW L

CAPP F WILLIAM

Correspondence with the SEC

Letter from the SEC

No description available

Letter from the SEC

Correspondence with the SEC

FILED AS OF DATE: 20070813

No description available

Letter from the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

FILED AS OF DATE: 20051202

Correspondence with the SEC

06

Correspondence with the SEC