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 $23.83 billion in total holdings as of March 31, 2026.
Westfield Capital Management Co Lp owns shares of 250 different stocks, but just 94 companies or ETFs make up 80% of its holdings.
Approximately 18.58% of the portfolio was purchased this quarter.
About 17.85% of the portfolio was sold this quarter.
This quarter, Westfield Capital Management Co Lp has purchased 241 new stocks and bought additional shares in 118 stocks.
Westfield Capital Management Co Lp sold shares of 77 stocks and completely divested from 37 stocks this quarter.

Largest Holdings

NVIDIA: $1,101,691,587
Ascendis Pharma A/S: $1,100,978,089
Comfort Systems USA: $856,235,416
Apple: $795,152,846
FTAI AVIATION LTD: $697,815,609

Largest New Holdings this Quarter

16411R208 - CHENIERE ENERGY INC: $130,258,215 Holding
G0260P102 - AMER SPORTS INC: $129,623,185 Holding
026874784 - American International Group: $109,768,039 Holding
48020Q107 - Jones Lang LaSalle: $105,836,105 Holding
778296103 - Ross Stores: $102,231,254 Holding

Largest Purchases this Quarter

Insmed: 1,035,938 shares (about $169.40M)
CHENIERE ENERGY INC: 459,044 shares (about $130.26M)
AMER SPORTS INC: 3,937,521 shares (about $129.62M)
FTAI AVIATION LTD: 497,602 shares (about $121.91M)
American International Group: 1,458,711 shares (about $109.77M)

Largest Sales this Quarter

Masimo: 1,180,820 shares (about $210.03M)
Bank of America: 2,756,724 shares (about $134.39M)
Revolution Medicines: 1,288,435 shares (about $125.30M)
HealthEquity: 1,239,604 shares (about $103.59M)
Semtech: 1,168,018 shares (about $89.81M)

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	$1,101,691,587	$63,828,655 â–²	6.2%	6,317,039	4.6%	Computer and Technology
ASND Ascendis Pharma A/S	$1,100,978,089	$85,146,112 â–¼	-7.2%	4,813,440	4.6%	Medical
FIX Comfort Systems USA	$856,235,416	$66,081,188 â–¼	-7.2%	620,915	3.6%	Construction
AAPL Apple	$795,152,846	$35,836,421 â–¼	-4.3%	3,133,113	3.3%	Computer and Technology
FTAI AVIATION LTD	$697,815,609	$121,912,489 â–²	21.2%	2,848,227	2.9%	SHS
MSFT Microsoft	$610,600,060	$10,473,587 â–²	1.7%	1,649,513	2.6%	Computer and Technology
GOOGL Alphabet	$582,810,504	$43,632,629 â–¼	-7.0%	2,026,744	2.4%	Computer and Technology
HWM Howmet Aerospace	$527,683,511	$16,264,021 â–²	3.2%	2,289,697	2.2%	Aerospace
VRT Vertiv	$481,538,482	$89,211,473 â–¼	-15.6%	1,921,696	2.0%	Computer and Technology
AMZN Amazon.com	$474,783,586	$10,645,930 â–¼	-2.2%	2,279,654	2.0%	Retail/Wholesale
AXON Axon Enterprise	$451,927,224	$98,934,542 â–²	28.0%	1,064,134	1.9%	Aerospace
AVGO Broadcom	$382,840,683	$38,567,115 â–²	11.2%	1,236,925	1.6%	Computer and Technology
LLY Eli Lilly and Company	$335,329,189	$80,047,670 â–²	31.4%	364,579	1.4%	Medical
TPR Tapestry	$310,281,358	$14,217,959 â–²	4.8%	2,198,862	1.3%	Retail/Wholesale
META Meta Platforms	$301,410,388	$73,496,323 â–¼	-19.6%	526,822	1.3%	Computer and Technology
LPLA LPL Financial	$265,183,525	$76,995,655 â–²	40.9%	881,506	1.1%	Finance
MKSI MKS	$240,556,578	$47,568,367 â–²	24.6%	1,046,763	1.0%	Computer and Technology
INSM Insmed	$240,122,429	$169,396,591 â–²	239.5%	1,468,459	1.0%	Medical
PCVX Vaxcyte	$211,877,079	$6,184,124 â–²	3.0%	3,646,138	0.9%	Medical
ROCKET LAB CORP	$203,745,048	$37,258,383 â–²	22.4%	3,172,611	0.9%	COM
NFLX Netflix	$189,414,876	$35,810,770 â–²	23.3%	1,969,994	0.8%	Consumer Discretionary
APG APi Group	$187,807,323	$47,877,378 â–²	34.2%	4,634,929	0.8%	Business Services
PWR Quanta Services	$182,173,674	$32,001,287 â–²	21.3%	331,816	0.8%	Construction
GE VERNOVA INC	$173,974,371	$18,655,636 â–²	12.0%	199,306	0.7%	COM
ARES Ares Management	$171,591,074	$45,995,145 â–²	36.6%	1,572,787	0.7%	Finance
RYTM Rhythm Pharmaceuticals	$167,775,827	$57,571,096 â–²	52.2%	1,929,123	0.7%	Medical
TSM Taiwan Semiconductor Manufacturing	$166,779,716	$15,988,080 â–²	10.6%	493,504	0.7%	Computer and Technology
MRVL Marvell Technology	$165,748,387	$27,181,895 â–¼	-14.1%	1,673,381	0.7%	Computer and Technology
BE Bloom Energy	$161,446,090	$6,269,935 â–²	4.0%	1,191,572	0.7%	Energy
IOT Samsara	$160,757,713	$35,456,392 â–²	28.3%	5,072,821	0.7%	Computer and Technology
AME AMETEK	$159,876,481	$33,093,740 â–¼	-17.1%	745,832	0.7%	Computer and Technology
PERMIAN RESOURCES CORP	$159,504,663	$32,625,378 â–²	25.7%	7,481,457	0.7%	CLASS A COM
DT Dynatrace	$155,670,786	$31,539,724 â–²	25.4%	4,209,594	0.7%	Computer and Technology
RVMD Revolution Medicines	$151,377,191	$125,300,288 â–¼	-45.3%	1,556,578	0.6%	Medical
NTRA Natera	$150,938,268	$8,007,000 â–²	5.6%	754,729	0.6%	Medical
FN Fabrinet	$148,567,570	$49,390,057 â–²	49.8%	284,874	0.6%	Computer and Technology
ABIVAX SA	$147,309,146	$34,849,432 â–²	31.0%	1,322,938	0.6%	SPONSORED ADS
NOW ServiceNow	$145,762,300	$8,637,506 â–¼	-5.6%	1,394,187	0.6%	Computer and Technology
FTI TechnipFMC	$140,593,483	$5,622,205 â–²	4.2%	2,033,755	0.6%	Energy
RCL Royal Caribbean Cruises	$139,176,354	$15,716,074 â–²	12.7%	505,765	0.6%	Consumer Discretionary
HLT Hilton Worldwide	$139,093,786	$30,317,991 â–²	27.9%	457,425	0.6%	Consumer Discretionary
V Visa	$137,987,039	$44,543,518 â–¼	-24.4%	456,548	0.6%	Business Services
COR Cencora	$137,250,518	$36,972,373 â–²	36.9%	436,909	0.6%	Medical
ITT ITT	$134,001,464	$22,075,377 â–²	19.7%	703,309	0.6%	Multi-Sector Conglomerates
CELH Celsius	$133,720,962	$78,932,214 â–²	144.1%	3,768,911	0.6%	Consumer Staples
NXT Nextpower	$133,490,560	$2,054,895 â–²	1.6%	1,107,346	0.6%	Energy
CHENIERE ENERGY INC	$130,258,215	$130,258,215 â–²	New Holding	459,044	0.5%	COM NEW
AMER SPORTS INC	$129,623,185	$129,623,185 â–²	New Holding	3,937,521	0.5%	COM SHS
RRX Regal Rexnord	$127,658,325	$39,583,580 â–¼	-23.7%	681,717	0.5%	Industrials
MSCI MSCI	$126,000,886	$13,999,140 â–²	12.5%	233,764	0.5%	Finance
GH Guardant Health	$125,857,727	$76,052,747 â–²	152.7%	1,362,539	0.5%	Medical
LYV Live Nation Entertainment	$123,641,351	$5,410,443 â–²	4.6%	810,710	0.5%	Consumer Discretionary
TSLA Tesla	$117,510,828	$54,116,721 â–¼	-31.5%	316,102	0.5%	Auto/Tires/Trucks
GL Globe Life	$117,240,009	$32,511,504 â–²	38.4%	842,423	0.5%	Finance
BROS Dutch Bros	$117,194,666	$27,039,319 â–²	30.0%	2,313,357	0.5%	Retail/Wholesale
NET Cloudflare	$111,746,725	$4,558,257 â–²	4.3%	541,566	0.5%	Computer and Technology
ROKU Roku	$111,483,082	$6,220,413 â–²	5.9%	1,178,219	0.5%	Consumer Discretionary
XPO XPO	$111,281,044	$29,614,790 â–¼	-21.0%	571,992	0.5%	Transportation
FITB Fifth Third Bancorp	$110,826,718	$63,255,483 â–¼	-36.3%	2,385,422	0.5%	Finance
EVERPURE INC	$110,686,006	$20,932,277 â–²	23.3%	1,874,763	0.5%	CL A
KTOS Kratos Defense & Security Solutions	$110,217,424	$22,391,085 â–²	25.5%	1,563,146	0.5%	Aerospace
AIG American International Group	$109,768,039	$109,768,039 â–²	New Holding	1,458,711	0.5%	Finance
SNOW Snowflake	$108,410,941	$10,512,910 â–²	10.7%	718,810	0.5%	Computer and Technology
PRIMORIS SVCS CORP	$106,317,198	$29,884,918 â–¼	-21.9%	743,269	0.4%	COM
JLL Jones Lang LaSalle	$105,836,105	$105,836,105 â–²	New Holding	347,779	0.4%	Finance
LEGENCE CORP	$105,108,928	$14,020,542 â–²	15.4%	1,861,653	0.4%	CL A
LEGN Legend Biotech	$104,261,271	$7,257,745 â–¼	-6.5%	5,763,475	0.4%	Medical
KEY KeyCorp	$104,126,347	$23,118,392 â–²	28.5%	5,193,334	0.4%	Finance
ROST Ross Stores	$102,231,254	$102,231,254 â–²	New Holding	471,916	0.4%	Retail/Wholesale
PLMR Palomar	$102,066,862	$1,659,855 â–²	1.7%	854,116	0.4%	Finance
PANW Palo Alto Networks	$102,040,950	$30,143,846 â–²	41.9%	636,483	0.4%	Computer and Technology
FANG Diamondback Energy	$99,582,200	$29,434,933 â–²	42.0%	503,474	0.4%	Energy
PALANTIR TECHNOLOGIES INC	$98,674,222	$76,061,523 â–²	336.4%	674,557	0.4%	CL A
SMTC Semtech	$98,464,871	$89,808,903 â–¼	-47.7%	1,280,594	0.4%	Computer and Technology
WWD Woodward	$97,420,455	$97,420,455 â–²	New Holding	272,185	0.4%	Aerospace
ARISTA NETWORKS INC	$95,817,728	$95,817,728 â–²	New Holding	780,402	0.4%	COM SHS
AZO AutoZone	$95,803,684	$76,874,662 â–¼	-44.5%	28,363	0.4%	Retail/Wholesale
SN SharkNinja	$95,790,892	$6,828,538 â–²	7.7%	904,541	0.4%	Retail/Wholesale
COHR Coherent	$94,484,681	$63,954,460 â–¼	-40.4%	396,644	0.4%	Business Services
ASTERA LABS INC	$94,268,376	$72,864,156 â–²	340.4%	860,113	0.4%	COM
BRZE Braze	$93,823,921	$42,182,358 â–²	81.7%	3,973,906	0.4%	Computer and Technology
JBL Jabil	$92,760,387	$5,524,307 â–²	6.3%	349,209	0.4%	Computer and Technology
LECO Lincoln Electric	$89,211,738	$5,091,195 â–²	6.1%	358,165	0.4%	Industrials
IMAX IMAX	$88,896,876	$293,057 â–¼	-0.3%	2,338,776	0.4%	Consumer Discretionary
WGS GeneDx	$87,924,116	$22,531,394 â–²	34.5%	1,369,108	0.4%	Medical
GRMN Garmin	$87,319,632	$9,423,770 â–²	12.1%	376,362	0.4%	Computer and Technology
CRDO Credo Technology Group	$86,944,178	$42,760,789 â–²	96.8%	926,219	0.4%	Computer and Technology
FFIV F5	$86,377,157	$4,988,917 â–²	6.1%	298,542	0.4%	Computer and Technology
EWBC East West Bancorp	$86,043,863	$7,280,605 â–¼	-7.8%	805,956	0.4%	Finance
LTH Life Time Group	$85,817,774	$85,817,774 â–²	New Holding	3,185,515	0.4%	Consumer Discretionary
BIRKENSTOCK HOLDING PLC	$83,798,452	$13,757,932 â–²	19.6%	2,338,779	0.4%	COM SHS
ORLY O'Reilly Automotive	$81,971,195	$5,972,734 â–¼	-6.8%	887,999	0.3%	Retail/Wholesale
MS Morgan Stanley	$81,718,617	$81,718,617 â–²	New Holding	496,558	0.3%	Finance
XENE Xenon Pharmaceuticals	$81,496,236	$10,159,503 â–²	14.2%	1,401,483	0.3%	Medical
ALNY Alnylam Pharmaceuticals	$81,241,478	$50,323,666 â–²	162.8%	245,539	0.3%	Medical
FCFS FirstCash	$81,214,684	$19,879,308 â–¼	-19.7%	431,993	0.3%	Business Services
IEX IDEX	$80,751,901	$4,553,181 â–²	6.0%	426,019	0.3%	Industrials
MTZ MasTec	$80,428,565	$80,428,565 â–²	New Holding	249,980	0.3%	Construction
HLI Houlihan Lokey	$78,073,412	$3,390,725 â–²	4.5%	543,611	0.3%	Finance
PLXS Plexus	$77,875,212	$76,822,004 â–²	7,294.1%	384,493	0.3%	Computer and Technology

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

Stock Ideas and Recommendations

Advanced Stock Screeners and Research Tools

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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