DIAMOND OFFSHORE DRILLING IN

CUSIP: 25271C102 Class: COM

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

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

Q3 2013
Shares 4,375 Value ($000) $273 Avg Close — Range —
Q2 2013
Shares 3,475 Value ($000) $239 Avg Close — Range —