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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
86264	Carbon Natural Gas Co	CRBO	Crude Petroleum & Natural Gas (1311)	260818050

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1535264	Awm Investment Company, Inc.	527 Madison Avenue Suite 2600 New York NY 10022		No	No	Yes	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	Disposition	2015-07-01	20,000	$0.62	10,868,889	No	4	S	Indirect	By Limited Partnerships

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Limited Partnerships

Footnotes

This is a weighted average price.
AWM Investment Company, Inc., a Delaware Corporation (AWM), is the investment adviser to Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman) & Special Situations Private Equity Fund, L.P. (PE and together with QP and Cayman, the Funds). As the investment adviser to the Funds, AWM holds sole voting and investment power over. 7,540,556 shares of Common Stock of the Issuer (the Shares) held by QP, 2,217,222 Shares held by Cayman & 1,111,111 Shares held by PE. Austin W. Marxe (Marxe), David M. Greenhouse (Greenhouse) & Adam C. Stettner (Stettner) are the controlling principals of AWM. The reporting person disclaims beneficial ownership of the Shares, except to the extent of its pecuniary interest therein. This report shall not be deemed an admission that the reporting person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.