ATMI INC

CUSIP: 00207R101 Class: COM

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q1 2014
Shares 1,452,146 Value ($000) $49,388 Avg Close — Range —
Q4 2013
Shares 1,432,203 Value ($000) $43,266 Avg Close — Range —
Q3 2013
Shares 1,419,485 Value ($000) $37,644 Avg Close — Range —
Q2 2013
Shares 1,384,997 Value ($000) $32,755 Avg Close — Range —