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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1375557	Guidance Software Inc.	GUID	Services-Prepackaged Software (7372)	954661210

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1383366	Mark Harrington	C/O Guidance Software, Inc. 215 North Marengo Ave. Pasadena CA 91101	General Counsel & Corp. Sec.	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	2012-02-28	9,398	$4.54	83,158	No	4	M	Direct
Common Stock	Disposition	2012-02-28	9,398	$11.48	73,760	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	Employee Stock Option (right to buy)	Disposition	2012-02-28	9,398	$0.00	9,398	$4.54

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
90,000		2014-08-13	No	4	M	Direct

Footnotes

Pursuant to a Section 10b5-1 Plan established by Mr. Harrington on February 10, 2012, vested employee stock options representing a total of 9,398 shares of Common Stock were exercised and sold, at an average price of $11.48 per share.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.40 to $11.54 per share, inclusive.
The reporting person undertakes to provide Guidance Software, Inc., any security holder of Guidance Software, Inc., 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 indicated in the footnotes to this Form 4.
The exercised options are part of an award granted to Mr. Harrington on August 13, 2004, which fully vested over a four-year period after the grant date.