OYO GEOSPACE CORP

CUSIP: 671074102 Class: COM

RATIONAL ADVISORS LLC's Holding History (CIK: 0001143565)

Note: Option positions (PUT/CALL) are excluded.

Q3 2012
Shares 105,000 Value ($000) $12,853 Avg Close — Range —
Q2 2012
Shares 91,000 Value ($000) $8,189 Avg Close — Range —
Q1 2012
Shares 83,000 Value ($000) $8,742 Avg Close — Range —
Q4 2011
Shares 76,000 Value ($000) $5,877 Avg Close — Range —
Q3 2011
Shares 67,000 Value ($000) $3,771 Avg Close — Range —
Q2 2011
Shares 71,000 Value ($000) $7,100 Avg Close — Range —
Q1 2011
Shares 70,000 Value ($000) $6,901 Avg Close — Range —
Q4 2010
Shares 58,000 Value ($000) $5,748 Avg Close — Range —
Q1 2010
Shares 51,000 Value ($000) $2,438 Avg Close — Range —
Q4 2009
Shares 46,000 Value ($000) $1,973 Avg Close — Range —
Q3 2009
Shares 46,000 Value ($000) $1,188 Avg Close — Range —
Q2 2009
Shares 46,000 Value ($000) $1,180 Avg Close — Range —
Q1 2009
Shares 46,000 Value ($000) $601 Avg Close — Range —