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Institutional Investment Manager
WESTFIELD CAPITAL MANAGEMENT CO LP
WESTFIELD CAPITAL MANAGEMENT CO LP (CIK: 0001177719) incorporated in Delaware, located at One Financial Center, Boston, MA. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q2)
Portfolio Summary: 257 holdings with a total value of $12,120,551,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 LKQ CORP 2,455,028 77,824,000 0.64%
52 ICON PLC 1,079,645 75,586,000 0.62%
53 ALIGN TECHNOLOGY INC 892,968 71,929,000 0.59%
54 KELLOGG CO 855,694 69,867,000 0.58%
55 MSCI INC 895,159 69,035,000 0.57%
56 WR GRACE & CO 935,978 68,523,000 0.57%
57 QUEST DIAGNOSTICS INC 834,546 67,940,000 0.56%
58 HD SUPPLY HLDGS INCORPORATED 1,906,698 66,391,000 0.55%
59 ULTA BEAUTY INC 271,803 66,222,000 0.55%
60 MIDDLEBY CORP 570,199 65,715,000 0.54%
61 IHS INC A 566,671 65,513,000 0.54%
62 ON SEMICONDUCTOR CORP 7,253,093 63,972,000 0.53%
63 FORTINET INC 1,997,059 63,087,000 0.52%
64 POLYONE CORP 1,769,227 62,348,000 0.51%
65 VULCAN MATLS CO 513,109 61,758,000 0.51%
66 NEXSTAR MEDIA GROUP INC 1,283,796 61,083,000 0.50%
67 BROADCOM LTD 385,820 59,956,000 0.49%
68 BIOGEN INC 245,663 59,406,000 0.49%
69 AFFILIATED MANAGERS GROUP 421,088 59,277,000 0.49%
70 NEUROCRINE BIOSCIE COM USD0.001 1,275,575 57,975,000 0.48%
71 MICROSEMI CORP 1,771,088 57,879,000 0.48%
72 SCHWAB CHARLES CORP 2,285,518 57,846,000 0.48%
73 DEXCOM INC 710,001 56,324,000 0.46%
74 SABRE CORP 2,099,585 56,248,000 0.46%
75 ALKERMES PLC 1,272,500 54,997,000 0.45%
76 TRANSUNION 1,643,851 54,970,000 0.45%
77 TEAM HEALTH HOLDINGS INC 1,323,590 53,830,000 0.44%
78 TOTAL SYS SVCS INC 1,006,731 53,467,000 0.44%
79 VANTIV INC 935,657 52,958,000 0.44%
80 RED HAT INC 727,661 52,828,000 0.44%
81 Wright Medical Group NV 3,025,577 52,554,000 0.43%
82 LIBERTY MEDIA HOLDING CP INTER A 2,034,811 51,623,000 0.43%
83 QLIK TECHNOLOGIES INC COM 1,714,038 50,701,000 0.42%
84 BAKER HUGHES INC 1,122,733 50,669,000 0.42%
85 BAXTER INTL INC 1,112,610 50,312,000 0.42%
86 ALLEGIANT TRAVEL CO 326,617 49,482,000 0.41%
87 SANOFI SPOND FUNSPONSORED ADR 9,074,557 48,912,000 0.40%
88 HALLIBURTON CO 1,077,006 48,778,000 0.40%
89 MONOLITHIC PWR SYS INC 701,438 47,922,000 0.40%
90 COGNIZANT TECHNOLOGY SOLUTIO 813,708 46,577,000 0.38%
91 SNAP ON INC 291,642 46,027,000 0.38%
92 PACIRA PHARMACEUTICALS INC 1,333,868 44,991,000 0.37%
93 TELEFLEX INC 250,933 44,493,000 0.37%
94 EAST WEST BANCORP INC 1,283,965 43,886,000 0.36%
95 MASIMO CORP 825,464 43,349,000 0.36%
96 ULTIMATE SOFTWARE GROUP INCORPORATED 203,867 42,871,000 0.35%
97 BRIGHT HORIZONS FAM SOL IN DEL COM 640,474 42,470,000 0.35%
98 LULULEMON ATHLETICA INC 574,130 42,405,000 0.35%
99 WATSCO INC 297,908 41,913,000 0.35%
100 SPLUNK INC 765,947 41,499,000 0.34%
Page 2 of 6

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001085146-16-004272, filed 2016.08.12).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.