ARCH COAL INC

CUSIP: 039380100 Class: COM

TETRAD CORP's Holding History (CIK: 0000883597)

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

Q3 2012
Shares 50,400 Value ($000) $319 Avg Close — Range —
Q2 2012
Shares 38,400 Value ($000) $265 Avg Close — Range —
Q1 2012
Shares 33,800 Value ($000) $362 Avg Close — Range —
Q4 2011
Shares 31,700 Value ($000) $460 Avg Close — Range —