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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
1550921	B. Robbin Adams	7007 Pinemont Drive Houston TX 77040	Executive Vice President	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, Par Value $.01 Per Share	Acquisiton	2013-08-28	1,000	$8.78	2,550	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2013-08-28	1,000	$68.80	1,550	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	Options (right to buy)	Disposition	2013-08-28	1,000	$0.00	1,500	$8.78

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
500	2012-12-05	2018-12-05	No	4	M	Direct

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Stock	Options (right to buy)	$21.95	2014-02-25	2020-02-25	13,000	13,000	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2020-02-25	13,000	13,000	Direct

Footnotes

These shares were issued upon the exercise of options (described in Table II) and then immediately sold.
The shares that were issued upon the exercise of options were immediately sold, as is presented in Table I.
This option becomes exercisable in equal annual installments over a four year period. The option will become fully exercisable on February 25, 2014.
Pursuant to General Instruction 4(c)(iii) of Form 4, the exercise price is reported in column 2 of this Table II.
This option became exercisable in equal annual installments over a four year period, and is now fully exercisable.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.78 to $68.88, inclusive. The reporting person undertakes to provide
On October 18, 2012, the common stock of Geospace Technologies Corporation (the "Company") split 2-for-1, resulting in the reporting person's direct ownership of 775 additional shares of common stock.
On October 18, 2012, the common stock of the Company split 2-for-1, resulting in the reporting person's ownership of 6,500 additional options for which the strike price was reduced to $21.945.
On October 18, 2012, the common stock of the Company split 2-for-1, resulting in the reporting person's ownership of 750 additional options for which the strike price was reduced to $8.78.