ATMI INC

CUSIP: 00207R101 Class: COM

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

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

Q1 2014
Shares 58,039 Value ($000) $1,974 Avg Close — Range —
Q4 2013
Shares 57,839 Value ($000) $1,747 Avg Close — Range —
Q3 2013
Shares 57,439 Value ($000) $1,523 Avg Close — Range —
Q2 2013
Shares 55,640 Value ($000) $1,316 Avg Close — Range —
Q1 2013
Shares 55,467 Value ($000) $1,244 Avg Close — Range —