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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1001115	Oyo Geospace Corp	OYOG	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	2010-09-03	4,519	$17.94	59,519	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	1,938	$50.00	57,581	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	109	$50.05	57,472	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	15	$50.15	57,457	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	1,234	$50.25	56,223	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	43	$50.33	56,180	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	2	$50.35	56,178	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	35	$50.36	56,143	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	1,008	$50.40	55,135	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	62	$50.45	55,073	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-03	73	$50.50	55,000	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Acquisiton	2010-09-07	709	$17.94	55,709	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2010-09-07	709	$50.00	55,000	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
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
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	2010-09-03	4,519	$0.00	4,519	$17.94
Common Stock	Options (right to buy)	Disposition	2010-09-08	709	$0.00	709	$17.94

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
101,256	2004-11-10	2010-11-10	No	4	M	Direct
100,547	2004-11-10	2010-11-10	No	4	M	Direct

Footnotes

The 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 became exercisable in equal annual installments over a four year period. The option became fully exercisable on November 10, 2004.
This number represents the partial exercise of the option issued to Mr. Sheen in November 2000 to purchase shares of common stock, par value $.01 per share, of OYO Geospace Corporation.
Pursuant to General Instruction 4(c)(iii) of Form 4, the exercise price is reported in Cell 2 of this Table II.
Includes options to purchase shares of common stock, par value $.01 per share, of OYO Geospace Corporation having varying exercise dates, expiration dates and exercise prices.