GEOSPACE TECHNOLOGIES CORP — Director's Dealing 2005

Aug 17, 2005

SEC Form 4/A — Form 4/A

Issuer: OYO GEOSPACE CORP (OYOG)
CIK: 0001001115
Period of Report: 1998-04-16

Reporting Person: OYO CORP USA (10% Owner)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
1998-04-16	Options (obligation to sell)	$14.00	S	160000	Disposed	2008-04-15	Common Stock (160000)	Direct
2002-06-28	Options (obligation to sell)	$10.01	S	140000	Disposed	2015-05-31	Common Stock (140000)	Direct

Footnotes

F1: Pursuant to a privately negotiated agreement between OYO Corporation U.S.A. and Ernest M. Hall, Jr. dated as of April 16, 1998, as amended by agreement dated as of June 22, 1999, OYO Corporation U.S.A. granted to Mr. Hall options to purchase 160,000 shares of common stock, par value $.01 of OYO Geospace Corporation. The options vested in equal portions over a three year period. OYO Geospace Corporation is not a party to this transaction.

F2: The options were originally issued on April 16, 1998 pursuant to a privately negotiated agreement between OYO Corporation U.S.A. and Ernest M. Hall, Jr. with an exercise price of $21.00 per share. The agreement was amended on June 22, 1998 to reduce the exercise price to $14.00 per share.

F3: The options were granted to Ernest M. Hall, Jr. by OYO Corporation U.S.A. as compensation for services provided to OYO Corporation U.S.A.

F4: Pursuant to a privately negotiated agreement between OYO Corporation U.S.A. and Ernest M. Hall, Jr. dated as of June 28, 2002, OYO Corporation U.S.A. granted to Mr. Hall options to purchase 140,000 shares of common stock, par value $.01 of OYO Geospace Corporation. The options became fully exercisable on May 31, 2005. OYO Geospace Corporation is not a party to this transaction.

F5: The options were granted to Ernest M. Hall, Jr. by OYO Corporation U.S.A. as compensation for consulting and advisory services provided to OYO Corporation U.S.A.