ATP OIL & GAS CORP

CUSIP: 00208J702 Class: PREF

TETRAD CORP's Holding History (CIK: 0000883597)

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

Q2 2012
Shares 8,500 Value ($000) $149 Avg Close — Range —
Q1 2012
Shares 7,500 Value ($000) $381 Avg Close — Range —
Q4 2011
Shares 7,000 Value ($000) $270 Avg Close — Range —
Q3 2011
Shares 7,000 Value ($000) $412 Avg Close — Range —
Q2 2011
Shares 6,000 Value ($000) $543 Avg Close — Range —
Q1 2011
Shares 6,000 Value ($000) $626 Avg Close — Range —
Q4 2010
Shares 6,000 Value ($000) $539 Avg Close — Range —