AMERICAN TOWER CORP

CUSIP: 029912201 Class: COM

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

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

Q1 2010
Shares 36,100 Value ($000) $1,538 Avg Close — Range —
Q4 2009
Shares 50,500 Value ($000) $2,182 Avg Close — Range —