Mistras Group, Inc.

CUSIP: 60649t107 Class: COM

GREAT LAKES ADVISORS, LLC's Holding History (CIK: 0001078013)

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

Q4 2013
Shares 28,187 Value ($000) $589 Avg Close — Range —
Q3 2013
Shares 20,350 Value ($000) $346 Avg Close — Range —