IRON MTN INC

CUSIP: 462846106 Class: COM

STATE OF MICHIGAN RETIREMENT SYSTEM's Holding History (CIK: 0000762152)

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

Q4 2014
Shares 76,830 Value ($000) $2,970 Avg Close — Range —
Q3 2014
Shares 70,466 Value ($000) $2,301 Avg Close — Range —
Q2 2014
Shares 69,966 Value ($000) $2,480 Avg Close — Range —
Q1 2014
Shares 69,566 Value ($000) $1,918 Avg Close — Range —
Q4 2013
Shares 69,166 Value ($000) $2,099 Avg Close — Range —
Q3 2013
Shares 69,166 Value ($000) $1,869 Avg Close — Range —
Q2 2013
Shares 68,166 Value ($000) $1,814 Avg Close — Range —