ENSCO PLC ADR

CUSIP: 29358Q109 Class: COMMON STOCK-FO

RATIONAL ADVISORS LLC's Holding History (CIK: 0001143565)

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

Q2 2011
Shares 3,065 Value ($000) $163 Avg Close — Range —
Q1 2011
Shares 3,065 Value ($000) $177 Avg Close — Range —
Q4 2010
Shares 3,065 Value ($000) $164 Avg Close — Range —
Q1 2010
Shares 700 Value ($000) $31 Avg Close — Range —
Q4 2009
Shares 700 Value ($000) $28 Avg Close — Range —