ATMI INC

CUSIP: 00207R101 Class: COM

CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM's Holding History (CIK: 0000919079)

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

Q1 2014
Shares 75,600 Value ($000) $2,567 Avg Close — Range —
Q4 2013
Shares 73,700 Value ($000) $2,248 Avg Close — Range —
Q3 2013
Shares 72,908 Value ($000) $1,934 Avg Close — Range —
Q2 2013
Shares 60,608 Value ($000) $1,433 Avg Close — Range —