WESTFIELD CAPITAL MANAGEMENT CO LP

Est. AUM

$23.83B

13F long equity, this entity only

Positions

250

Period

Mar 2026 (Q1)

SEC EDGAR

View filings ↗

Mar 2026 (Q1)

#	Issuer	Class	Value	Shares	% Portfolio	Discretion
1	NVIDIA CORPORATION	COM	$1.10B	6317039	4.62%	SOLE
2	ASCENDIS PHARMA A/S	SPONSORED ADR	$1.10B	4813440	4.62%	SOLE
3	COMFORT SYS USA INC	COM	$856.2M	620915	3.59%	SOLE
4	APPLE INC	COM	$795.2M	3133113	3.34%	SOLE
5	FTAI AVIATION LTD	SHS	$697.8M	2848227	2.93%	SOLE
6	MICROSOFT CORP	COM	$610.6M	1649513	2.56%	SOLE
7	ALPHABET INC	CAP STK CL A	$582.8M	2026744	2.45%	SOLE
8	HOWMET AEROSPACE INC	COM	$527.7M	2289697	2.21%	SOLE
9	VERTIV HOLDINGS CO	COM CL A	$481.5M	1921696	2.02%	SOLE
10	AMAZON COM INC	COM	$474.8M	2279654	1.99%	SOLE
11	AXON ENTERPRISE INC	COM	$451.9M	1064134	1.90%	SOLE
12	BROADCOM INC	COM	$382.8M	1236925	1.61%	SOLE
13	ELI LILLY & CO	COM	$335.3M	364579	1.41%	SOLE
14	TAPESTRY INC	COM	$310.3M	2198862	1.30%	SOLE
15	META PLATFORMS INC	CL A	$301.4M	526822	1.26%	SOLE
16	LPL FINL HLDGS INC	COM	$265.2M	881506	1.11%	SOLE
17	MKS INC.	COM	$240.6M	1046763	1.01%	SOLE
18	INSMED INC	COM PAR $.01	$240.1M	1468459	1.01%	SOLE
19	VAXCYTE INC	COM	$211.9M	3646138	0.89%	SOLE
20	ROCKET LAB CORP	COM	$203.7M	3172611	0.85%	SOLE
21	NETFLIX INC.	COM	$189.4M	1969994	0.79%	SOLE
22	API GROUP CORP	COM STK	$187.8M	4634929	0.79%	SOLE
23	QUANTA SVCS INC	COM	$182.2M	331816	0.76%	SOLE
24	GE VERNOVA INC	COM	$174.0M	199306	0.73%	SOLE
25	ARES MANAGEMENT CORPORATION	CL A COM STK	$171.6M	1572787	0.72%	SOLE
26	RHYTHM PHARMACEUTICALS INC	COM	$167.8M	1929123	0.70%	SOLE
27	TAIWAN SEMICONDUCTOR MANUFAC	SPONSORED ADS	$166.8M	493504	0.70%	SOLE
28	MARVELL TECHNOLOGY INC	COM	$165.7M	1673381	0.70%	SOLE
29	BLOOM ENERGY CORP	COM CL A	$161.4M	1191572	0.68%	SOLE
30	SAMSARA INC	COM CL A	$160.8M	5072821	0.67%	SOLE
31	AMETEK INC	COM	$159.9M	745832	0.67%	SOLE
32	PERMIAN RESOURCES CORP	CLASS A COM	$159.5M	7481457	0.67%	SOLE
33	DYNATRACE INC	COM NEW	$155.7M	4209594	0.65%	SOLE
34	REVOLUTION MEDICINES INC	COM	$151.4M	1556578	0.64%	SOLE
35	NATERA INC	COM	$150.9M	754729	0.63%	SOLE
36	FABRINET	SHS	$148.6M	284874	0.62%	SOLE
37	ABIVAX SA	SPONSORED ADS	$147.3M	1322938	0.62%	SOLE
38	SERVICENOW INC	COM	$145.8M	1394187	0.61%	SOLE
39	TECHNIPFMC PLC	COM	$140.6M	2033755	0.59%	SOLE
40	ROYAL CARIBBEAN GROUP	COM	$139.2M	505765	0.58%	SOLE
41	HILTON WORLDWIDE HLDGS INC	COM	$139.1M	457425	0.58%	SOLE
42	VISA INC	COM CL A	$138.0M	456548	0.58%	SOLE
43	CENCORA INC	COM	$137.3M	436909	0.58%	SOLE
44	ITT INC	COM	$134.0M	703309	0.56%	SOLE
45	CELSIUS HLDGS INC	COM NEW	$133.7M	3768911	0.56%	SOLE
46	NEXTPOWER INC	CLASS A COM	$133.5M	1107346	0.56%	SOLE
47	CHENIERE ENERGY INC	COM NEW	$130.3M	459044	0.55%	SOLE
48	AMER SPORTS INC	COM SHS	$129.6M	3937521	0.54%	SOLE
49	REGAL REXNORD CORPORATION	COM	$127.7M	681717	0.54%	SOLE
50	MSCI INC	COM	$126.0M	233764	0.53%	SOLE

1–50 of 250

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Values in USD (reported in $thousands on 13F). Source: SEC EDGAR.