DRILL RIGS HLDS INC

CUSIP: 262049AA7 Class: CORP

ADVENT CAPITAL MANAGEMENT /DE/'s Holding History (CIK: 0001097278)

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

Q1 2014
Shares 1,600,000 Value ($000) $1,668 Avg Close — Range —
Q4 2013
Shares 1,600,000 Value ($000) $1,728 Avg Close — Range —
Q3 2013
Shares 1,600,000 Value ($000) $1,652 Avg Close — Range —
Q2 2013
Shares 2,100,000 Value ($000) $2,095 Avg Close — Range —