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Institutional Holdings of IRON MOUNTAIN INC (IRM) on 12/31/2011

1. Company Information

Company/StockIRON MOUNTAIN INC (stock symbol: IRM)
Funds Ownership298 out of total 3028 funds (10%) own this stock
Funds own total 163,204,087 shares, 81.32% of all outstanding shares
Funds SOLD -22,534,033 shares (-12.13%) in the quarter ended on 12/31/2011

2. Top 20 Funds Held IRM in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)DAVIS SELECTED ADVISERS32,254,418Cut -20.60%2.17%16.07%
2.)JANUS CAPITAL MANAGEMENT LLC13,281,379New0.48%6.62%
3.)VANGUARD GROUP INC11,041,657Added 7.72%0.05%5.50%
4.)SCHOONER CAPITAL TRUST9,234,256Unchanged99.91%4.60%
5.)CAPITAL RESEARCH GLOBAL INVESTORS9,165,000Unchanged0.13%4.57%
6.)ELLIOTT MANAGEMENT CORP8,510,000New8.30%4.24%
7.)STATE STREET CORP6,278,723Cut -4.40%0.03%3.13%
8.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA4,637,474Added 0.45%0.04%2.31%
9.)CAPITAL WORLD INVESTORS4,152,200Cut -36.29%0.05%2.07%
10.)CAPITAL GUARDIAN TRUST CO3,088,131Cut -5.78%0.63%1.54%
11.)NEUBERGER BERMAN GROUP LLC2,715,934Cut -3.81%0.12%1.35%
12.)PARNASSUS INVESTMENTS CA2,693,000Added 10.60%1.63%1.34%
13.)INVESCO LTD2,552,478Cut -12.61%0.05%1.27%
14.)BANK OF NEW YORK MELLON CORP2,358,705Added 22.96%0.03%1.18%
15.)MUNDER CAPITAL MANAGEMENT2,237,664New0.71%1.11%
16.)NORTHERN TRUST CORP1,975,522Cut -6.92%0.03%0.98%
17.)BLACKROCK FUND ADVISORS1,906,851Added 0.37%0.03%0.95%
18.)JENNISON ASSOCIATES LLC1,658,619Cut -18.12%0.07%0.83%
19.)BREEDEN CAPITAL MANAGEMENT LLC1,633,459Cut -12.72%7.61%0.81%
20.)HIGHFIELDS CAPITAL MANAGEMENT LP1,626,402Cut -58.39%0.56%0.81%



3. Top 20 Funds Held IRM in this Quarter (By % of Portfolio) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)SCHOONER CAPITAL TRUST9,234,256Unchanged99.91%4.60%
2.)MAKAIRA PARTNERS LLC389,549New12.70%0.19%
3.)ELLIOTT MANAGEMENT CORP8,510,000New8.30%4.24%
4.)BREEDEN CAPITAL MANAGEMENT LLC1,633,459Cut -12.72%7.61%0.81%
5.)VEGASOUL CAPITAL MANAGEMENT (ASIA) LTD33,700New5.64%0.02%
6.)BISLETT MANAGEMENT LLC129,000Cut -26.29%3.41%0.06%
7.)BLUEMOUNTAIN CAPITAL MANAGEMENT LLC368,365Cut -1.48%3.19%0.18%
8.)BERNZOTT CAPITAL ADVISORS290,380Cut -9.27%2.75%0.14%
9.)MARBLE HARBOR INVESTMENT COUNSEL LLC208,008Added 0.46%2.59%0.10%
10.)DAVIS SELECTED ADVISERS32,254,418Cut -20.60%2.17%16.07%
11.)SOLARIS ASSET MANAGEMENT LLC70,425Cut -14.27%2.01%0.04%
12.)NANTAHALA CAPITAL MANAGEMENT LLC321,600CALLNew1.89%0.16%
13.)WELCH & FORBES LLC1,274,795Cut -1.72%1.64%0.64%
14.)PARNASSUS INVESTMENTS CA2,693,000Added 10.60%1.63%1.34%
15.)ARCHIPEL ASSET MANAGEMENT AB175,837New1.60%0.09%
16.)JET CAPITAL INVESTORS L P200,000CALLCut -33.33%1.44%0.10%
17.)GW CAPITAL INC545,071Added 1.72%1.13%0.27%
18.)APEX CAPITAL MANAGEMENT288,151Cut -0.92%1.03%0.14%
19.)GARRISON BRADFORD & ASSOCIATES INC24,855Cut -12.34%0.94%0.01%
20.)JACOBS & CO CA49,327Cut -0.65%0.90%0.02%

4. Top 20 Funds BOUGHT NEW IRM in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)JANUS CAPITAL MANAGEMENT LLC13,281,3790.48%6.62%
2.)ELLIOTT MANAGEMENT CORP8,510,0008.30%4.24%
3.)MUNDER CAPITAL MANAGEMENT2,237,6640.71%1.11%
4.)J P MORGAN CHASE & CO600,000PUT0.01%0.30%
5.)MAKAIRA PARTNERS LLC389,54912.70%0.19%
6.)RENAISSANCE TECHNOLOGIES LLC327,5500.04%0.16%
7.)NANTAHALA CAPITAL MANAGEMENT LLC321,600CALL1.89%0.16%
8.)TWO SIGMA INVESTMENTS LLC283,6140.10%0.14%
9.)F&C ASSET MANAGEMENT PLC233,2860.13%0.12%
10.)PINEBRIDGE INVESTMENTS LTD231,4660.24%0.12%
11.)ARCHIPEL ASSET MANAGEMENT AB175,8371.60%0.09%
12.)MILLENNIUM MANAGEMENT LLC170,6780.04%0.09%
13.)NATIONAL RURAL ELECTRIC COOPERATIVE ASSOCIATION107,9000.10%0.05%
14.)ANDRA AP FONDEN104,2000.10%0.05%
15.)J P MORGAN CHASE & CO100,000CALL0.00%0.05%
16.)EULAV ASSET MANAGEMENT76,8000.16%0.04%
17.)MADISON SQUARE INVESTORS LLC72,9830.02%0.04%
18.)FJARDE AP FONDEN (THE FOURTH SWEDISH NATIONAL PENSIONFUND)64,3790.05%0.03%
19.)TD SECURITIES (USA) LLC59,5760.05%0.03%
20.)JEFFERIES GROUP INC DE 55,9040.02%0.03%

5. Top 20 Funds SOLD OUT IRM in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)JANUS CAPITAL MANAGEMENT LLC12,181,8320.47%6.07%
2.)ELLIOTT ASSOCIATES LP9,977,87613.45%4.97%
3.)PERRY CORP4,505,0005.96%2.24%
4.)ETON PARK CAPITAL MANAGEMENT LP2,063,0000.83%1.03%
5.)ROUNDKEEP CAPITAL ADVISORS LLC806,6004.75%0.40%
6.)RIVERFRONT INVESTMENT GROUP LLC710,4141.26%0.35%
7.)INTERNATIONAL VALUE ADVISERS LLC454,5100.32%0.23%
8.)DIAMONDBACK CAPITAL MANAGEMENT LLC398,6740.52%0.20%
9.)FORCE CAPITAL MANAGEMENT LLC339,0002.31%0.17%
10.)LOCUST WOOD CAPITAL ADVISERS LLC240,0003.20%0.12%
11.)CITIGROUP INC165,000CALL0.01%0.08%
12.)GW CAPITAL MANAGEMENT LLC157,8390.17%0.08%
13.)UBS OCONNOR LLC133,8000.08%0.07%
14.)MADISON SQUARE INVESTORS LLC133,0520.05%0.07%
15.)BROWN CAPITAL MANAGEMENT INC114,9720.13%0.06%
16.)OXFORD ASSET MANAGEMENT91,8790.09%0.05%
17.)EULAV ASSET MANAGEMENT LLC62,8000.14%0.03%
18.)TIMBER HILL LLC56,100CALL0.00%0.03%
19.)TIMBER HILL LLC53,400PUT0.00%0.03%
20.)MERU CAPITAL GROUP LP50,000CALL0.71%0.02%