ARBITRON INC

CUSIP: 03875Q108 Class: COM

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

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

Q2 2013
Shares 46,797 Value ($000) $2,174 Avg Close — Range —
Q1 2013
Shares 45,946 Value ($000) $2,153 Avg Close — Range —