Westfield Capital Management Co Lp Top Holdings and 13F Report (2026)

About Westfield Capital Management Co Lp

Investment Activity

Westfield Capital Management Co Lp has $30.61 billion in total holdings as of June 30, 2026.
Westfield Capital Management Co Lp owns shares of 278 different stocks, but just 101 companies or ETFs make up 80% of its holdings.
Approximately 30.39% of the portfolio was purchased this quarter.
About 24.93% of the portfolio was sold this quarter.
This quarter, Westfield Capital Management Co Lp has purchased 250 new stocks and bought additional shares in 98 stocks.
Westfield Capital Management Co Lp sold shares of 103 stocks and completely divested from 41 stocks this quarter.

Largest Holdings

NVIDIA: $1,616,712,338
Alphabet: $1,339,806,415
ASCENDIS PHARMA A/S: $1,279,793,795
Axon Enterprise: $836,144,444
FTAI AVIATION LTD: $794,608,199

Largest New Holdings this Quarter

K08588103 - ASCENDIS PHARMA A/S: $1,279,793,795 Holding
144285103 - Carpenter Technology: $193,738,341 Holding
69366J200 - PTC Therapeutics: $159,563,645 Holding
512807306 - LAM RESEARCH CORP: $123,765,288 Holding
N07059210 - ASML: $114,253,539 Holding

Largest Purchases this Quarter

ASCENDIS PHARMA A/S: 4,798,267 shares (about $1.28B)
Alphabet: 1,722,330 shares (about $615.51M)
NVIDIA: 1,762,887 shares (about $352.74M)
Snowflake: 1,017,688 shares (about $259.00M)
Axon Enterprise: 427,356 shares (about $239.58M)

Largest Sales this Quarter

Comfort Systems USA: 265,482 shares (about $526.17M)
Marvell Technology: 1,660,188 shares (about $494.54M)
Bloom Energy: 1,181,002 shares (about $357.49M)
Amazon.com: 1,419,848 shares (about $338.41M)
ASTERA LABS INC: 610,814 shares (about $295.04M)

Sector Allocation Over Time

Selling

Neutral

Buying

Latest 13F Holdings and Changes Since Previous Quarterly Filing

Issuer Name	Holdings Value	Approximate Purchase/Sale	Change in Shares	Shares Held	% of Portfolio	Sector
NVDA NVIDIA	$1,616,712,338	$352,736,048 â–²	27.9%	8,079,926	5.3%	Technology
GOOGL Alphabet	$1,339,806,415	$615,508,998 â–²	85.0%	3,749,074	4.4%	Communication Services
ASCENDIS PHARMA A/S	$1,279,793,795	$1,279,793,795 â–²	New Holding	4,798,267	4.2%	ORD SHS
AXON Axon Enterprise	$836,144,444	$239,580,115 â–²	40.2%	1,491,490	2.7%	Industrials
FTAI AVIATION LTD	$794,608,199	$24,077,438 â–²	3.1%	2,937,228	2.6%	SHS
AAPL Apple	$744,747,287	$161,850,342 â–¼	-17.9%	2,573,774	2.4%	Technology
FIX Comfort Systems USA	$704,451,409	$526,172,778 â–¼	-42.8%	355,433	2.3%	Industrials
AVGO Broadcom	$587,976,343	$120,727,799 â–²	25.8%	1,556,522	1.9%	Technology
MSFT Microsoft	$527,559,770	$87,741,362 â–¼	-14.3%	1,414,294	1.7%	Technology
HWM Howmet Aerospace	$516,608,027	$98,999,896 â–¼	-16.1%	1,921,476	1.7%	Industrials
LLY Eli Lilly and Company	$499,840,862	$62,553,873 â–²	14.3%	416,732	1.6%	Healthcare
SNOW Snowflake	$441,938,647	$259,001,541 â–²	141.6%	1,736,498	1.4%	Technology
MKSI MKS	$413,048,645	$52,551,316 â–¼	-11.3%	928,617	1.3%	Technology
META Meta Platforms	$381,566,445	$84,812,884 â–²	28.6%	677,389	1.2%	Communication Services
VRT Vertiv	$353,021,161	$290,401,114 â–¼	-45.1%	1,054,361	1.2%	Industrials
GE VERNOVA INC	$283,461,275	$49,304,254 â–²	21.1%	241,272	0.9%	COM
MU Micron Technology	$263,412,188	$147,482,337 â–²	127.2%	228,203	0.9%	Technology
V Visa	$261,572,839	$104,935,789 â–²	67.0%	762,403	0.9%	Finance
APG APi Group	$260,634,647	$64,345,404 â–²	32.8%	6,154,301	0.9%	Industrials
TPR Tapestry	$248,343,835	$73,525,669 â–¼	-22.8%	1,696,569	0.8%	Consumer Discretionary
RYTM Rhythm Pharmaceuticals	$245,220,303	$31,029,776 â–²	14.5%	2,208,595	0.8%	Healthcare
LTH Life Time Group	$244,846,173	$114,749,741 â–²	88.2%	5,995,254	0.8%	Consumer Discretionary
TSM Taiwan Semiconductor Manufacturing	$244,037,920	$8,355,092 â–²	3.5%	510,999	0.8%	Technology
GH Guardant Health	$243,717,584	$39,295,858 â–²	19.2%	1,624,459	0.8%	Healthcare
PWR Quanta Services	$238,685,542	$235,453 â–¼	-0.1%	331,489	0.8%	Industrials
NOW ServiceNow	$235,661,989	$97,247,127 â–²	70.3%	2,373,711	0.8%	Technology
AMD Advanced Micro Devices	$234,153,542	$231,237,377 â–²	7,929.5%	403,081	0.8%	Technology
PANW Palo Alto Networks	$224,504,060	$7,450,606 â–²	3.4%	658,331	0.7%	Technology
WWD Woodward	$223,996,287	$108,197,901 â–²	93.4%	526,505	0.7%	Industrials
ARISTA NETWORKS INC	$223,748,310	$91,173,594 â–²	68.8%	1,317,096	0.7%	COM SHS
LPLA LPL Financial	$223,389,290	$24,913,173 â–¼	-10.0%	793,061	0.7%	Finance
ROCKET LAB CORP	$214,888,621	$107,607,306 â–¼	-33.4%	2,114,005	0.7%	COM
AMER SPORTS INC	$214,712,179	$81,466,478 â–²	61.1%	6,344,923	0.7%	COM SHS
NET Cloudflare	$204,931,901	$72,096,612 â–²	54.3%	835,502	0.7%	Technology
AMZN Amazon.com	$204,926,241	$338,406,703 â–¼	-62.3%	859,806	0.7%	Consumer Discretionary
GRMN Garmin	$204,535,458	$115,134,438 â–²	128.8%	861,057	0.7%	Consumer Discretionary
RRX Regal Rexnord	$204,123,113	$41,744,941 â–²	25.7%	856,976	0.7%	Industrials
NTRA Natera	$197,243,187	$7,628,017 â–¼	-3.7%	726,628	0.6%	Healthcare
MS Morgan Stanley	$196,614,709	$92,814,200 â–²	89.4%	940,560	0.6%	Finance
CRS Carpenter Technology	$193,738,341	$193,738,341 â–²	New Holding	314,082	0.6%	Industrials
IOT Samsara	$189,276,373	$24,764,781 â–²	15.1%	5,836,459	0.6%	Technology
DT Dynatrace	$186,583,645	$1,740,373 â–²	0.9%	4,249,229	0.6%	Technology
CAT Caterpillar	$185,952,922	$151,530,014 â–²	440.2%	174,620	0.6%	Industrials
SMTC Semtech	$183,419,455	$23,844,717 â–¼	-11.5%	1,133,268	0.6%	Technology
AME AMETEK	$175,115,699	$5,330,906 â–¼	-3.0%	723,798	0.6%	Technology
ABIVAX SA	$174,547,280	$1,747,438 â–¼	-1.0%	1,309,825	0.6%	SPONSORED ADS
INSM Insmed	$173,743,795	$17,176,695 â–²	11.0%	1,629,561	0.6%	Healthcare
ITT ITT	$164,216,344	$25,129,956 â–²	18.1%	830,382	0.5%	Industrials
GILD Gilead Sciences	$162,679,071	$159,307,056 â–²	4,724.4%	1,287,629	0.5%	Healthcare
PTCT PTC Therapeutics	$159,563,645	$159,563,645 â–²	New Holding	1,956,156	0.5%	Healthcare
BROS Dutch Bros	$156,833,112	$9,289,054 â–¼	-5.6%	2,184,001	0.5%	Consumer Discretionary
CELH Celsius	$155,900,804	$45,547,090 â–²	41.3%	5,324,481	0.5%	Consumer Staples
MTZ MasTec	$155,796,579	$51,789,900 â–²	49.8%	374,457	0.5%	Industrials
SN SharkNinja	$153,541,302	$15,806,844 â–²	11.5%	1,008,349	0.5%	Consumer Discretionary
CSX CSX	$149,929,537	$71,110,585 â–²	90.2%	3,154,419	0.5%	Industrials
FCFS FirstCash	$149,928,147	$56,479,421 â–²	60.4%	693,085	0.5%	Finance
KEY KeyCorp	$149,674,414	$29,968,066 â–²	25.0%	6,493,467	0.5%	Finance
MCHP Microchip Technology	$149,486,918	$60,996,017 â–²	68.9%	1,639,111	0.5%	Technology
AMAT Applied Materials	$148,642,862	$147,966,135 â–²	21,865.0%	205,592	0.5%	Technology
MAR Marriott International	$147,851,416	$91,069,953 â–²	160.4%	398,962	0.5%	Consumer Discretionary
PCVX Vaxcyte	$143,722,240	$68,227,762 â–¼	-32.2%	2,472,428	0.5%	Healthcare
GL Globe Life	$137,760,493	$12,763,648 â–¼	-8.5%	770,990	0.4%	Finance
FTI TechnipFMC	$136,557,381	$1,719,424 â–²	1.3%	2,059,689	0.4%	Energy
XPO XPO	$129,129,668	$11,705,430 â–²	10.0%	629,011	0.4%	Industrials
LEGN Legend Biotech	$127,940,224	$38,508,940 â–¼	-23.1%	4,430,063	0.4%	Healthcare
EVERPURE INC	$127,006,190	$20,706,409 â–¼	-14.0%	1,611,958	0.4%	CL A
LAM RESEARCH CORP	$123,765,288	$123,765,288 â–²	New Holding	285,614	0.4%	COM NEW
JLL Jones Lang LaSalle	$123,500,507	$15,706,406 â–²	14.6%	398,453	0.4%	Real Estate
ASTERA LABS INC	$120,416,534	$295,035,699 â–¼	-71.0%	249,299	0.4%	COM
ROK Rockwell Automation	$117,401,415	$15,277,690 â–²	15.0%	237,136	0.4%	Industrials
IEX IDEX	$116,553,350	$19,868,338 â–²	20.5%	513,564	0.4%	Industrials
COHR Coherent	$114,806,662	$41,657,651 â–¼	-26.6%	291,040	0.4%	Technology
LEGENCE CORP	$114,375,506	$44,293,179 â–¼	-27.9%	1,341,963	0.4%	CL A
LECO Lincoln Electric	$114,350,112	$19,253,723 â–²	20.2%	430,681	0.4%	Industrials
ASML ASML	$114,253,539	$114,253,539 â–²	New Holding	57,430	0.4%	Technology
PL Planet Labs PBC	$113,569,872	$59,334,704 â–²	109.4%	3,428,007	0.4%	Industrials
ONTO Onto Innovation	$113,301,496	$10,436,516 â–¼	-8.4%	299,383	0.4%	Technology
COR Cencora	$113,208,499	$10,428,104 â–¼	-8.4%	400,058	0.4%	Healthcare
RVMD Revolution Medicines	$112,521,763	$178,994,181 â–¼	-61.4%	600,821	0.4%	Healthcare
SANDISK CORP	$111,466,432	$111,466,432 â–²	New Holding	49,024	0.4%	COM
AFRM Affirm	$110,271,910	$22,146,044 â–²	25.1%	1,352,200	0.4%	Finance
LYV Live Nation Entertainment	$108,174,743	$40,274,292 â–¼	-27.1%	590,764	0.4%	Communication Services
NPO Enpro	$108,010,799	$108,010,799 â–²	New Holding	286,554	0.4%	Industrials
PERMIAN RESOURCES CORP	$105,984,308	$31,749,315 â–¼	-23.1%	5,756,888	0.3%	CLASS A COM
ARES Ares Management	$105,970,698	$69,096,250 â–¼	-39.5%	952,032	0.3%	Finance
IMAX IMAX	$105,788,998	$12,565,387 â–²	13.5%	2,654,014	0.3%	Communication Services
GWRE Guidewire Software	$103,280,418	$43,406,626 â–²	72.5%	839,337	0.3%	Technology
NXT Nextpower	$102,150,517	$29,778,686 â–¼	-22.6%	857,399	0.3%	Industrials
FROG JFrog	$101,291,304	$101,291,304 â–²	New Holding	1,114,561	0.3%	Technology
SNPS Synopsys	$101,193,710	$41,934,171 â–²	70.8%	226,856	0.3%	Technology
ROKU Roku	$98,985,184	$63,773,989 â–¼	-39.2%	716,557	0.3%	Communication Services
PLXS Plexus	$96,758,011	$18,847,499 â–¼	-16.3%	321,808	0.3%	Technology
AIT Applied Industrial Technologies	$96,606,412	$1,186,907 â–¼	-1.2%	285,691	0.3%	Industrials
MSCI MSCI	$96,303,610	$34,613,923 â–¼	-26.4%	171,958	0.3%	Finance
HOOD Robinhood Markets	$95,821,962	$32,306,208 â–²	50.9%	955,544	0.3%	Finance
ROST Ross Stores	$94,169,075	$6,278,222 â–¼	-6.3%	442,420	0.3%	Consumer Discretionary
ADPT Adaptive Biotechnologies	$91,540,985	$25,076,616 â–¼	-21.5%	4,267,645	0.3%	Healthcare
XENE Xenon Pharmaceuticals	$90,980,266	$6,386,752 â–²	7.5%	1,507,294	0.3%	Healthcare
ORLY O'Reilly Automotive	$85,943,469	$4,167,626 â–²	5.1%	933,255	0.3%	Consumer Discretionary
C Citigroup	$85,112,990	$78,890,792 â–²	1,267.9%	608,124	0.3%	Finance

Showing largest 100 holdings. View all holdings.

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Westfield Capital Management Co Lp Top Holdings and 13F Report (2026)

About Westfield Capital Management Co Lp

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

Best-in-Class Portfolio Monitoring

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Westfield Capital Management Co Lp Top Holdings and 13F Report (2026)

About Westfield Capital Management Co Lp

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Map of 500 Largest Holdings ofWestfield Capital Management Co Lp

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

MarketBeat All Access Features

Best-in-Class Portfolio Monitoring

Stock Ideas and Recommendations

Advanced Stock Screeners and Research Tools