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Institutional Holdings of AMERICAN TOWER CORP. (AMT) on 12/31/2011

1. Company Information

Company/StockAMERICAN TOWER CORP. (stock symbol: AMT)
Funds Ownership377 out of total 3028 funds (12%) own this stock
Funds own total 255,448,241 shares, 64.88% of all outstanding shares
Funds SOLD -110,025,174 shares (-30.10%) in the quarter ended on 12/31/2011

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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)FMR LLC27,580,553Added 12.23%0.34%7.01%
2.)PRICE T ROWE ASSOCIATES INC MD 27,557,461Cut -2.04%0.58%7.00%
3.)VANGUARD GROUP INC15,536,040Cut -0.40%0.15%3.95%
4.)GOLDMAN SACHS GROUP INC11,150,781Cut -22.49%0.34%2.83%
5.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA10,078,238Added 7.75%0.15%2.56%
6.)WINSLOW CAPITAL MANAGEMENT INC MN9,271,333Added 7.95%2.16%2.35%
7.)WELLS FARGO & CO MN6,692,246Cut -5.91%0.29%1.70%
8.)NEUBERGER BERMAN GROUP LLC6,515,645Cut -8.07%0.56%1.65%
9.)TCW GROUP INC6,125,146Added 3.81%1.68%1.56%
10.)GENERAL ELECTRIC CO6,039,013Cut -1.81%1.58%1.53%
11.)BLACKROCK FUND ADVISORS5,952,756Added 61.05%0.19%1.51%
12.)MASSACHUSETTS FINANCIAL SERVICES CO MA 5,865,082Cut -5.65%0.39%1.49%
13.)EDGEWOOD MANAGEMENT LLC5,141,116Cut -3.37%5.12%1.31%
14.)BANK OF NEW YORK MELLON CORP3,899,984Added 11.57%0.10%0.99%
15.)INVESCO LTD3,776,310Added 6.28%0.13%0.96%
16.)NORTHERN TRUST CORP3,746,523Cut -21.65%0.12%0.95%
17.)VIKING GLOBAL INVESTORS LP3,271,887Cut -31.39%2.05%0.83%
18.)RAINIER INVESTMENT MANAGEMENT INC 3,156,962Cut -4.54%1.29%0.80%
19.)AMERICAN CENTURY COMPANIES INC2,926,095Cut -21.37%0.29%0.74%
20.)PERRY CORP2,882,849New7.11%0.73%



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

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)AKRE CAPITAL MANAGEMENT LLC1,387,074Added 1.07%12.95%0.35%
2.)AVENIR CORP1,170,854Cut -2.69%11.03%0.30%
3.)PARTNER ADVISORY SERVICES LP167,000New9.87%0.04%
4.)PERRY CORP2,882,849New7.11%0.73%
5.)GLADE BROOK CAPITAL PARTNERS LLC124,900New7.05%0.03%
6.)LAND & BUILDINGS INVESTMENT MANAGEMENT LLC75,900New6.79%0.02%
7.)NEW YORK LIFE INVESTMENT MANAGEMENT LLC193,752Unchanged6.62%0.05%
8.)PARTNER FUND MANAGEMENT LP1,347,497Added 22.10%5.34%0.34%
9.)EDGEWOOD MANAGEMENT LLC5,141,116Cut -3.37%5.12%1.31%
10.)WESTEND ADVISORS LLC1,694,304Cut -5.22%5.09%0.43%
11.)PARTNER INVESTMENT MANAGEMENT LP425,198Added 32.53%4.56%0.11%
12.)MAR VISTA INVESTMENT PARTNERS LLC882,530Added 14.26%4.40%0.22%
13.)FBR CAPITAL MARKETS CORP1,110,595Cut -3.06%4.35%0.28%
14.)RAIL SPLITTER CAPITAL MANAGEMENT LLC220,845Cut -9.91%4.07%0.06%
15.)GLENVIEW CAPITAL MANAGEMENT LLC2,634,280Added 6.65%3.17%0.67%
16.)40 NORTH INDUSTRIES LLC159,100CALLNew2.99%0.04%
17.)GLUSKIN SHEFF & ASSOC INC206,020Added 57.94%2.98%0.05%
18.)FRIEDBERG INVESTMENT MANAGEMENT74,260Added 33.25%2.97%0.02%
19.)GRAND JEAN CAPITAL MANAGEMENT INC91,970Added 3.02%2.96%0.02%
20.)40 NORTH INDUSTRIES LLC138,240New2.60%0.04%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)PERRY CORP2,882,8497.11%0.73%
2.)UBS GLOBAL ASSET MANAGEMENT AMERICAS INC818,0730.08%0.21%
3.)MADISON SQUARE INVESTORS LLC373,2440.24%0.09%
4.)BARING ASSET MANAGEMENT INC MA 204,9320.58%0.05%
5.)PARTNER ADVISORY SERVICES LP167,0009.87%0.04%
6.)40 NORTH INDUSTRIES LLC159,100CALL2.99%0.04%
7.)TD ASSET MANAGEMENT USA INC153,6470.54%0.04%
8.)40 NORTH INDUSTRIES LLC138,2402.60%0.04%
9.)FIDUCIARY TRUST CO133,5860.38%0.03%
10.)TD SECURITIES (USA) LLC126,1460.20%0.03%
11.)GLADE BROOK CAPITAL PARTNERS LLC124,9007.05%0.03%
12.)GREAT WEST LIFE ASSURANCE CO CAN 81,7000.04%0.02%
13.)MAIN STREET RESEARCH LLC78,5602.41%0.02%
14.)LAND & BUILDINGS INVESTMENT MANAGEMENT LLC75,9006.79%0.02%
15.)JANUS CAPITAL MANAGEMENT LLC71,7000.01%0.02%
16.)ANDRA AP FONDEN71,5000.14%0.02%
17.)NATIONAL RURAL ELECTRIC COOPERATIVE ASSOCIATION54,4690.10%0.01%
18.)WESTPAC BANKING CORP40,1120.05%0.01%
19.)WEISS GEORGE A39,5000.08%0.01%
20.)ABSOLUTE RETURN CAPITAL LLC34,3130.32%0.01%

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

No.FundSharesPut/Call% Port.% Out. Shrs
1.)STATE STREET CORP16,246,6770.17%4.13%
2.)CAPITAL WORLD INVESTORS14,796,2380.33%3.76%
3.)JENNISON ASSOCIATES LLC13,309,8041.10%3.38%
4.)CAPITAL GUARDIAN TRUST CO5,596,7012.03%1.42%
5.)TIAA CREF INVESTMENT MANAGEMENT LLC5,042,0570.28%1.28%
6.)EARNEST PARTNERS LLC3,661,3411.80%0.93%
7.)WELLINGTON MANAGEMENT CO LLP3,594,6680.08%0.91%
8.)FRANKLIN RESOURCES INC3,465,5370.15%0.88%
9.)COHEN & STEERS INC2,458,0230.55%0.62%
10.)GEODE CAPITAL MANAGEMENT LLC2,331,3210.17%0.59%
11.)CAPITAL INTERNATIONAL INC CA 1,924,9921.84%0.49%
12.)GOODMAN & COMPANY INVESTMENT COUNSEL LTD1,418,1110.40%0.36%
13.)SUMITOMO MITSUI TRUST HOLDINGS INC1,379,6240.18%0.35%
14.)CAPITAL INTERNATIONAL LTD CA 1,318,4002.44%0.33%
15.)PANAGORA ASSET MANAGEMENT INC1,307,8700.68%0.33%
16.)UBS GLOBAL ASSET MANAGEMENT AMERICAS INC1,302,9350.12%0.33%
17.)YORK CAPITAL MANAGEMENT GLOBAL ADVISORS LLC1,273,4001.97%0.32%
18.)DF DENT & CO INC1,167,9462.48%0.30%
19.)CREDIT AGRICOLE S A1,131,1520.30%0.29%
20.)ALGER FRED MANAGEMENT INC1,105,3160.46%0.28%