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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1001115	Geospace Technologies Corp	GEOS	Measuring & Controlling Devices, Nec (3829)	760447780

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1049654	J Michael Sheen	7007 Pinemont Drive Houston TX 77040	Svp & Chief Technical Officer	Yes	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
Common Stock, Par Value $.01 Per Share	Acquisiton	2012-12-05	15,000	$8.78	15,000	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-12-05	14,771	$76.29	229	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-12-05	229	$76.73	0	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Options (right to buy)	Disposition	2012-12-05	15,000	$8.78	15,000	$8.78

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2012-12-05	2018-12-05	No	4	M	Direct

Footnotes

These shares were issued upon the exercise of options (described in Table II) and then immediately sold pursuant to Rule 10b5-1 trading plans adopted by the reporting person.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.66 to $76.64, inclusive. The reporting person undertakes to provide to Geospace Technologies Corporation, any security holder of Geospace Technologies Corporation, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
The shares that were issued upon the exercise of options were immediately sold, as is presented in Table I.
This option became exercisable in four equal annual installments, and were fully exercisable on December 5, 2012.
Pursuant to General Instruction C(iii) of Form 4, the exercise price is reported in column 2 of this Table II
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.69 to $76.78, inclusive. The reporting person undertakes to provide to Geospace Technologies Corporation, any security holder of Geospace Technologies Corporation, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.