MARATHON OIL CORP

CUSIP: 565849106 Class: COM

TETRAD CORP's Holding History (CIK: 0000883597)

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

Q1 2013
Shares 17,000 Value ($000) $573 Avg Close — Range —
Q4 2012
Shares 17,000 Value ($000) $521 Avg Close — Range —
Q3 2012
Shares 17,000 Value ($000) $503 Avg Close — Range —
Q2 2012
Shares 17,000 Value ($000) $435 Avg Close — Range —
Q1 2012
Shares 14,900 Value ($000) $472 Avg Close — Range —
Q4 2011
Shares 14,000 Value ($000) $410 Avg Close — Range —
Q3 2011
Shares 14,000 Value ($000) $302 Avg Close — Range —