POWERSHARES DB CMDTY IDX TRA

CUSIP: 73935S105 Class: EXCHANGE TRADED

TETRAD CORP's Holding History (CIK: 0000883597)

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

Q1 2012
Shares 20,100 Value ($000) $579 Avg Close — Range —
Q4 2011
Shares 18,900 Value ($000) $507 Avg Close — Range —
Q3 2011
Shares 18,900 Value ($000) $487 Avg Close — Range —
Q2 2011
Shares 16,800 Value ($000) $487 Avg Close — Range —
Q1 2011
Shares 16,800 Value ($000) $513 Avg Close — Range —