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FRONTIER CAPITAL MANAGEMENT CO LLC Information

99 SUMMER STREET, BOSTON, Massachusetts, 02110,

Report Date: 03/31/2013

Position Statistics:

Total Positions 342
New Positions 29
Increased Positions 180
Decreased Positions 162
Positions with Activity 342
Sold Out Positions 27
Total Mkt Value
(in $ millions)		 11,324

Sector Weighting

Basic Materials 6.98%
Capital Goods 9.4%
Conglomerates 0.05%
Consumer Cyclical 7.96%
Consumer/Non-Cyclical 0.5%
Energy 8.38%
Financial 12.03%
Healthcare 13.47%
Services 15.28%
Technology 21.19%
Transportation 4.47%
Utilities 0.3%

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

29 New Positions as of 03/31/2013

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
CHART INDS INC COM PAR $0.01 53,010 53,010 New 543,920
HORNBECK OFFSHORE SVCS INC NEW COM 42,788 42,788 New 777,820
TRW AUTOMOTIVE HLDGS CORP COM 40,363 40,363 New 613,890
OCEANEERING INTL INC COM 37,991 37,991 New 512,360
HERTZ GLOBAL HOLDINGS INC COM 37,712 37,712 New 1,488,840
SIRIUS XM RADIO INC COM 33,175 33,175 New 9,757,240
BLOCK H & R INC COM 31,659 31,659 New 1,083,485
COMPUTER SCIENCES CORP COM 30,169 30,169 New 660,300
TIFFANY & CO NEW COM 29,991 29,991 New 391,580
HEARTLAND PMT SYS INC COM 28,952 28,952 New 812,812
GLOBE SPECIALTY METALS INC COM 27,207 27,207 New 2,397,085
ATWOOD OCEANICS INC COM 27,074 27,074 New 479,100
CHARLES RIV LABS INTL INC COM 22,877 22,877 New 537,520
CARBO CERAMICS INC COM 21,769 21,769 New 299,190
TRONOX LTD SHS CL A 16,031 16,031 New 716,005
ENVESTNET INC COM 15,271 15,271 New 626,127
XILINX INC COM 14,898 14,898 New 370,650
PANDORA MEDIA INC COM 13,957 13,957 New 897,570
INCYTE CORP COM 13,608 13,608 New 635,580
HEARTWARE INTL INC COM 12,746 12,746 New 135,180