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Filing Details

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
1373486	Joseph Robert Johnson	C/O A123 Systems, Inc. 321 Arsenal Street Watertown MA 02472	Vp And Gm, Energy Sol'ns Group	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-04-20	30,000	$6.84	30,000	No	4	M	Direct
Common Stock	Disposition	2010-04-20	30,000	$13.45	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-20	30,000	$0.00	30,000	$6.84

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
130,000	2009-01-22	2018-01-25	No	4	M	Direct

Footnotes

25% of the shares subject to the option vest on this date, and 6.25% of the shares subject to the option vest quarterly thereafter until the option is fully vested.
The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.35 to $13.74, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.