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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
1550990	R. Walter Wheeler	7007 Pinemont Drive Houston TX 77040	Executive Vice President & Coo	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	2013-02-19	4,000	$4.33	35,930	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2013-02-19	1,505	$108.00	34,425	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	2013-02-19	4,000	$0.00	4,000	$4.33

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2004-03-25	2013-03-25	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)	$8.78	2009-12-05	2018-12-05	6,000	6,000	Direct
21.945	Options (right to buy)	$21.95	2011-02-25	2020-02-25	20,000	20,000	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2018-12-05	6,000	6,000	Direct
2020-02-25	20,000	20,000	Direct

Footnotes

These shares were issued upon the exercise of options (described in Table II) and then immediately sold.
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 15,965 additional shares of common stock.
1505 of the shares that were issued upon the exercise of options were immediately sold, as is presented in Table I.
Pursuant to General Instruction 4(c)(iii) of Form 4, the exercise price is reported in Column 2 of this Table II.
On October 18, 2012, the common stock of the Company split 2-for-1, resulting in the reporting person's ownership of 3,000 additional options for which the strike price was reduced to $8.78.
On October 18, 2012, the common stock of the Company split 2-for-1, resulting in the reporting person's ownership of 10,000 additional options for which the strike price was reduced to $21.945.
This option is fully vested.
This option vests in four equal annual installments beginning February 25, 2011 and will be fully vested on February 25, 2014.