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Filing Details

Accession Number:: 0001104659-12-062819
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-09-11 16:02:13
Reporting Period:: 2012-08-29

Filing Date:: 2012-09-11
Accepted Time:: 2012-09-11 16:02:13
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1167178	A123 Systems Inc.	AONE	Miscellaneous Electrical Machinery, Equipment & Supplies (3690)	043583876

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1472755	P Jeffrey Mccarthy	C/O A123 Systems, Inc. 200 West Street Waltham MA 02451		Yes	No	No	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, $0.001 Par Value	Disposition	2012-08-29	204,419	$0.28	2,266,387	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-29	97,037	$0.28	1,075,849	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-29	289,557	$0.28	3,210,311	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-29	141,976	$0.28	1,574,083	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-30	474,103	$0.26	1,792,284	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-30	225,056	$0.26	850,793	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-30	671,561	$0.26	2,538,750	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-30	329,280	$0.26	1,244,803	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-31	138,472	$0.26	1,653,812	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-31	65,733	$0.26	785,060	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-31	196,144	$0.26	2,342,606	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-08-31	96,173	$0.26	1,148,630	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-04	69,721	$0.26	1,584,091	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-04	33,096	$0.26	751,964	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-04	98,759	$0.26	2,243,847	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-04	48,424	$0.26	1,100,206	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-05	278,884	$0.22	1,305,207	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-05	132,386	$0.22	619,578	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-05	395,036	$0.22	1,848,811	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-05	193,694	$0.22	906,512	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-06	348,762	$0.20	956,445	No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-06	165,557	$0.20	454,021	No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-06	494,018	$0.20	1,354,793	No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
Common Stock, $0.001 Par Value	Disposition	2012-09-06	242,227	$0.20	664,285	No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners IV-B, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-A, L.P.
No	4	S	Indirect	By North Bridge Venture Partners V-B, L.P.

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, $0.001 Par Value	10,000	Direct

Footnotes

Includes 7,500 restricted stock units ("RSUs"). Upon vesting thereof, the Reporting Person is entitled to receive one (1) share of common stock for each one (1) RSU.
The transaction was executed in multiple trades in prices ranging from $0.2800 to $0.2916, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.
The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
The transaction was executed in multiple trades in prices ranging from $0.2600 to $0.2657, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.
The transaction was executed in multiple trades in prices ranging from $0.2600 to $0.2625, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.
The transaction was executed in multiple trades in prices ranging from $0.2200 to $0.2250, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.
The transaction was executed in multiple trades in prices ranging from $0.2000 to $0.2106, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.