USEC INC

CUSIP: 90333E108 Class: CMN

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

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

Q4 2010
Shares 261,700 Value ($000) $1,575 Avg Close — Range —
Q1 2010
Shares 260,300 Value ($000) $1,502 Avg Close — Range —
Q4 2009
Shares 258,700 Value ($000) $996 Avg Close — Range —
Q3 2009
Shares 101,000 Value ($000) $474 Avg Close — Range —