Westfield Capital Management Co. LP

Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q3 2024Q2 2024Q1 2024

In its 13F for Q4 2024 (holdings as of December 31, 2024, filed February 11, 2025), Westfield Capital Management Co. LP reported 239 stock positions worth $23.0 billion. Its top holding was Nvidia (NVDA) at 4.3% of the portfolio, followed by Apple (AAPL, 4.0%) and Microsoft (MSFT, 3.4%). Compared with Q3 2024, it opened 31 new positions, sold out of 39, added to 100 and reduced 95. The biggest buy was Tapestry (TPR, shares +112%) and the biggest sale Sap SE-Sponsored ADR (SAP, shares −99%).

Most Recent 13F: Q2 2026
Location: BOSTON, MA
CIK: 0001177719
Portfolio Value: $23.0B (Q4 2024)
SEC Filing: 0001085146-25-000986 ↗ filed Feb 11, 2025

Holdings Value

Holdings 239 stocks · $23.0B


NVDA Nvidia Corp.	4.33%	7,399,837	$993.7M	Reduce -2.4%
AAPL Apple Inc.	3.98%	3,655,031	$915.3M	Reduce -2.2%
MSFT Microsoft Corp.	3.44%	1,872,811	$789.4M	Reduce -2.2%
ASND Ascendis Pharma A/S	3.31%	5,528,239	$761.1M	Add +7.7%
AMZN Amazon.com Inc.	3.29%	3,442,248	$755.2M	Reduce -0.5%
GOOGL Alphabet Inc. Class A	2.86%	3,475,412	$657.9M	Add +10.7%
META Meta Platforms Inc. Class A	2.30%	900,959	$527.5M	Reduce -1.2%
TDG Transdigm Group Inc.	2.00%	362,218	$459.0M	Reduce -2.6%
AXON Axon Enterprise Inc.	1.85%	714,870	$424.9M	Reduce -39.2%
VRT Vertiv Holdings Co. Class A	1.84%	3,720,010	$422.6M	Add +3.0%
FIX Comfort Systems USA Inc.	1.63%	885,127	$375.3M	Add +25.0%
FTAI Ftai Aviation Ltd.	1.56%	2,488,704	$358.5M	Add +49.9%
NOW ServiceNow Inc.	1.45%	315,043	$334.0M	Reduce -7.8%
AVGO Broadcom Inc.	1.37%	1,354,977	$314.1M	Add +15.1%
V Visa Inc. Class A	1.24%	899,652	$284.3M	Add +0.3%
TSLA Tesla Inc.	1.16%	660,107	$266.6M	Add +26.6%
TPR Tapestry Inc.	1.03%	3,604,918	$235.5M	Add +112.2%
LPLA LPL Financial Holdings Inc.	1.00%	705,919	$230.5M	Reduce -0.7%
PCVX Vaxcyte Inc.	0.91%	2,566,759	$210.1M	Add +47.5%
GEV GE Vernova Inc.	0.88%	611,800	$201.2M	Add +48.1%
CRM Salesforce Inc.	0.87%	597,103	$199.6M	Add +28.5%
LEGN Legend Biotech Corp.-ADR	0.81%	5,713,696	$185.9M	Add +13.4%
DXCM Dexcom Inc.	0.79%	2,345,601	$182.4M	Reduce -17.5%
PGR Progressive Corp.	0.78%	748,166	$179.3M	Reduce -9.7%
NFLX Netflix Inc.	0.78%	200,346	$178.6M	Reduce -36.2%
RRX Regal Rexnord Corp.	0.77%	1,138,781	$176.7M	Add +16.3%
LLY Eli Lilly & Co.	0.74%	219,993	$169.8M	Add +734.9%
ARES Ares Management Corp. Class A	0.73%	953,770	$168.8M	Reduce -3.9%
OPCH Option Care Health Inc.	0.73%	7,265,228	$168.6M	Add +11.9%
UNH Unitedhealth Group Inc.	0.72%	329,064	$166.5M	Add +74.9%
MNDY Monday.com Ltd.	0.72%	697,900	$164.3M	Add +16.2%
CMG Chipotle Mexican Grill Inc.	0.70%	2,675,519	$161.3M	Reduce -1.1%
PODD Insulet Corp.	0.70%	617,796	$161.3M	Reduce -18.2%
FOUR SHIFT4 Payments Inc. Class A	0.70%	1,551,549	$161.0M	Add +6.6%
CWST Casella Waste Systems Inc. Class A	0.70%	1,520,303	$160.9M	Add +60.0%
KD Kyndryl Holdings Inc.	0.69%	4,609,799	$159.5M	Add +41.4%
TSM Taiwan Semiconductor-SP ADR	0.69%	803,686	$158.7M	Reduce -14.0%
IOT Samsara Inc. Class A	0.69%	3,603,576	$157.4M	Add +2.8%
DKNG Draftkings Inc. Class A	0.68%	4,223,007	$157.1M	Add +14.2%
TEAM Atlassian Corp. Class A	0.68%	637,778	$155.2M	Add +77.2%
SAIA Saia Inc.	0.67%	339,784	$154.8M	Add +11.9%
DT Dynatrace Inc.	0.67%	2,848,601	$154.8M	Add +5.4%
PLTR Palantir Technologies Inc. Class A	0.63%	1,908,976	$144.4M	Reduce -34.6%
LNTH Lantheus Holdings Inc.	0.61%	1,555,093	$139.1M	Add +2.4%
ORCL Oracle Corp.	0.60%	831,545	$138.6M	Add +41.2%
COST Costco Wholesale Corp.	0.59%	148,514	$136.1M	Add +0.5%
FLYW Flywire Corp.-Voting	0.58%	6,516,044	$134.4M	Add +4.6%
PCOR Procore Technologies Inc.	0.57%	1,753,156	$131.4M	Add +81.5%
MTSI Macom Technology Solutions H	0.56%	990,679	$128.7M	Reduce -18.2%
MASI Masimo Corp.	0.55%	768,858	$127.1M	Reduce -44.9%
OWL Blue Owl Capital Inc.	0.55%	5,452,474	$126.8M	Reduce -19.1%
ICLR Icon PLC	0.55%	602,999	$126.5M	Add +1.9%
TXRH Texas Roadhouse Inc.	0.54%	693,144	$125.1M	Add +24.3%
GKOS Glaukos Corp.	0.53%	807,151	$121.0M	Add +31715.2%
SN Sharkninja Inc.	0.53%	1,238,705	$120.6M	Add +17.2%
XYZ Block Inc.	0.52%	1,416,339	$120.4M	New
CHDN Churchill Downs Inc.	0.52%	894,209	$119.4M	Add +17.1%
PTC PTC Inc.	0.51%	634,650	$116.7M	Reduce -2.4%
HUBS HubSpot Inc.	0.50%	165,637	$115.4M	Reduce -5.8%
APP AppLovin Corp. Class A	0.49%	347,908	$112.7M	New
FLEX Flex Ltd.	0.48%	2,900,838	$111.4M	Reduce -0.6%
GPN Global Payments Inc.	0.48%	988,863	$110.8M	Reduce -2.3%
CSX CSX Corp.	0.47%	3,369,281	$108.7M	Add +11684.8%
P Everpure Inc. Class A filed as PURE STORAGE INC	0.46%	1,733,666	$106.5M	Add +74.2%
ITT Itt Inc.	0.46%	742,929	$106.1M	Add +11.0%
ITCI Intra-Cellular Therapies Inc.	0.44%	1,218,728	$101.8M	Add +5.1%
ANF Abercrombie & Fitch Co. Class A	0.43%	667,113	$99.7M	Add +27.8%
TRU Transunion	0.43%	1,061,400	$98.4M	Add +19.9%
AJG Arthur J Gallagher & Co. filed as GALLAGHER ARTHUR J & CO	0.43%	346,232	$98.3M	Add +51.0%
UNP Union Pacific Corp.	0.42%	427,029	$97.4M	Reduce -25.1%
BAC Bank of America Corp. filed as BANK AMERICA CORP	0.42%	2,194,025	$96.4M	Add +20.3%
TGT Target Corp.	0.40%	684,053	$92.5M	Add +0.1%
WSC Willscot Holdings Corp.	0.40%	2,754,583	$92.1M	Add +4.7%
LRCX Lam Research Corp.	0.40%	1,256,870	$90.8M	New
FN Fabrinet	0.39%	411,422	$90.5M	Add +172.2%
MSCI MSCI Inc.	0.39%	148,940	$89.4M	Reduce -3.3%
BIO Bio-Rad Laboratories-A	0.38%	264,605	$86.9M	Add +4.7%
MHO M/I Homes Inc.	0.37%	644,854	$85.7M	Reduce -41.8%
FICO Fair Isaac Corp.	0.37%	42,644	$84.9M	Reduce -29.0%
NTRA Natera Inc.	0.37%	535,794	$84.8M	New
TTD Trade Desk Inc./the Class A filed as THE TRADE DESK INC	0.37%	720,451	$84.7M	Reduce -2.2%
ROKU Roku Inc.	0.36%	1,119,183	$83.2M	Reduce -27.1%
DDOG Datadog Inc. Class A	0.35%	566,408	$80.9M	Reduce -5.3%
AXTA Axalta Coating Systems Ltd.	0.35%	2,349,318	$80.4M	Add +12.0%
JBHT Hunt (jb) Transprt SVCS Inc.	0.34%	461,641	$78.8M	Reduce -2.5%
BFAM Bright Horizons Family Solut	0.34%	707,105	$78.4M	Reduce -0.0%
TWLO Twilio Inc. Class A	0.34%	721,627	$78.0M	New
TW Tradeweb Markets Inc. Class A	0.33%	576,568	$75.5M	Reduce -3.0%
SPGI S&P Global Inc.	0.33%	150,474	$74.9M	Add +17.5%
AME Ametek Inc.	0.32%	411,359	$74.2M	Reduce -4.0%
IEX Idex Corp.	0.32%	354,256	$74.1M	Reduce -0.5%
AVY Avery Dennison Corp.	0.32%	395,054	$73.9M	Reduce -20.6%
RMBS Rambus Inc.	0.32%	1,389,538	$73.5M	Add +54.0%
PR Permian Resources Corp. Class A	0.32%	5,089,083	$73.2M	Reduce -0.6%
S Sentinelone Inc. Class A	0.32%	3,294,695	$73.1M	Reduce -0.5%
KMPR Kemper Corp.	0.32%	1,094,894	$72.7M	Add +30.6%
COIN Coinbase Global Inc. Class A	0.31%	290,306	$72.1M	Reduce -11.6%
VMC Vulcan Materials Co.	0.31%	280,200	$72.1M	Reduce -1.7%
FFIV F5 Inc.	0.31%	286,165	$72.0M	Reduce -36.6%
MLTX Moonlake Immunotherapeutics	0.31%	1,311,619	$71.0M	Add +12.4%

Show all 239 holdings

Portfolio Sells Q3 2024 → Q4 2024


SAP Sap SE-Sponsored ADR	Reduce -99.0%	0.01%	−0.67
CDNS Cadence Design SYS Inc.	Sold out	0.00%	−0.65
MDB Mongodb Inc.	Sold out	0.00%	−0.61
SUI Sun Communities Inc.	Sold out	0.00%	−0.59
ASML ASML Holding NV-NY Reg SHS	Sold out	0.00%	−0.56
ROST Ross Stores Inc.	Sold out	0.00%	−0.54
ABBV Abbvie Inc.	Reduce -91.0%	0.04%	−0.52
AIG American International Group	Reduce -88.7%	0.06%	−0.51
MHO M/I Homes Inc.	Reduce -41.8%	0.37%	−0.48
MTH Meritage Homes Corp.	Sold out	0.00%	−0.45
CSGP Costar Group Inc.	Reduce -94.5%	0.02%	−0.44
TDG Transdigm Group Inc.	Reduce -2.6%	2.00%	−0.40
STZ Constellation Brands Inc. Class A	Sold out	0.00%	−0.37
NSIT Insight Enterprises Inc.	Sold out	0.00%	−0.33
HUBB Hubbell Inc.	Sold out	0.00%	−0.33
ZS Zscaler Inc.	Sold out	0.00%	−0.31
PHM Pultegroup Inc.	Sold out	0.00%	−0.30
MASI Masimo Corp.	Reduce -44.9%	0.55%	−0.29
MSFT Microsoft Corp.	Reduce -2.2%	3.44%	−0.29
AVTR Avantor Inc.	Sold out	0.00%	−0.29
TOL Toll Brothers Inc.	Reduce -44.6%	0.22%	−0.28
ST Sensata Technologies Holdplc	Sold out	0.00%	−0.28
AXON Axon Enterprise Inc.	Reduce -39.2%	1.85%	−0.27
VKTX Viking Therapeutics Inc.	Sold out	0.00%	−0.27
STAG Stag Industrial Inc.	Reduce -84.7%	0.04%	−0.26
AMD Advanced Micro Devices	Sold out	0.00%	−0.26
CE Celanese Corp.	Sold out	0.00%	−0.25
WING Wingstop Inc.	Reduce -18.3%	0.28%	−0.24
ALAB Astera Labs Inc.	Sold out	0.00%	−0.24
NFLX Netflix Inc.	Reduce -36.2%	0.78%	−0.23
CCC CCC Intelligent Solutions Ho	Sold out	0.00%	−0.21
UNP Union Pacific Corp.	Reduce -25.1%	0.42%	−0.21
MOG.A Moog Inc. Class A	Reduce -38.0%	0.27%	−0.19
MQ Marqeta Inc.	Sold out	0.00%	−0.19
MU Micron Technology Inc.	Sold out	0.00%	−0.18
AVY Avery Dennison Corp.	Reduce -20.6%	0.32%	−0.17
INVA Innoviva Inc.	Sold out	0.00%	−0.17
PGR Progressive Corp.	Reduce -9.7%	0.78%	−0.17
FICO Fair Isaac Corp.	Reduce -29.0%	0.37%	−0.16
ROKU Roku Inc.	Reduce -27.1%	0.36%	−0.16
ENPH Enphase Energy Inc.	Sold out	0.00%	−0.15
CIEN Ciena Corp.	Reduce -94.5%	0.01%	−0.15
PRCT Procept Biorobotics Corp.	Reduce -42.3%	0.18%	−0.14
WEX Wex Inc.	Sold out	0.00%	−0.14
FFIV F5 Inc.	Reduce -36.6%	0.31%	−0.14
NXPI NXP Semiconductors NV	Reduce -21.3%	0.25%	−0.13
CLS Celestica Inc.	Sold out	0.00%	−0.12
APO Apollo Global Management Inc.	Reduce -44.2%	0.30%	−0.12
XPRO Expro Group Holdings NV	Sold out	0.00%	−0.12
GLOB Globant SA	Reduce -34.3%	0.25%	−0.11

Portfolio Buys Q3 2024 → Q4 2024


TPR Tapestry Inc.	Add +112.2%	1.03%	+0.66
LLY Eli Lilly & Co.	Add +734.9%	0.74%	+0.63
FTAI Ftai Aviation Ltd.	Add +49.9%	1.56%	+0.56
TSLA Tesla Inc.	Add +26.6%	1.16%	+0.54
GKOS Glaukos Corp.	Add +31715.2%	0.53%	+0.53
XYZ Block Inc.	New	0.52%	+0.52
GOOGL Alphabet Inc. Class A	Add +10.7%	2.86%	+0.51
APP AppLovin Corp. Class A	New	0.49%	+0.49
CSX CSX Corp.	Add +11684.8%	0.47%	+0.47
AVGO Broadcom Inc.	Add +15.1%	1.37%	+0.45
TEAM Atlassian Corp. Class A	Add +77.2%	0.68%	+0.42
GEV GE Vernova Inc.	Add +48.1%	0.88%	+0.40
LRCX Lam Research Corp.	New	0.40%	+0.40
FIX Comfort Systems USA Inc.	Add +25.0%	1.63%	+0.39
NTRA Natera Inc.	New	0.37%	+0.37
KD Kyndryl Holdings Inc.	Add +41.4%	0.69%	+0.36
TWLO Twilio Inc. Class A	New	0.34%	+0.34
PCOR Procore Technologies Inc.	Add +81.5%	0.57%	+0.30
CRM Salesforce Inc.	Add +28.5%	0.87%	+0.29
EAT Brinker International Inc.	New	0.28%	+0.28
RKLB Rocket Lab USA Inc.	New	0.28%	+0.28
OKTA Okta Inc.	New	0.28%	+0.28
CWST Casella Waste Systems Inc. Class A	Add +60.0%	0.70%	+0.27
TLN Talen Energy Corp.	New	0.27%	+0.27
P Everpure Inc. Class A	Add +74.2%	0.46%	+0.24
WIX Wix.com Ltd.	New	0.24%	+0.24
FN Fabrinet	Add +172.2%	0.39%	+0.23
UNH Unitedhealth Group Inc.	Add +74.9%	0.72%	+0.23
CHKP Check Point Software Tech	New	0.22%	+0.22
ALNY Alnylam Pharmaceuticals Inc.	New	0.22%	+0.22
VRT Vertiv Holdings Co. Class A	Add +3.0%	1.84%	+0.22
ONTO Onto Innovation Inc.	New	0.20%	+0.20
INSM Insmed Inc.	Add +272.8%	0.28%	+0.20
RYAN Ryan Specialty Holdings Inc.	New	0.19%	+0.19
AAON Aaon Inc.	Add +3758.3%	0.19%	+0.19
LYV Live Nation Entertainment Inc.	New	0.18%	+0.18
DOCU Docusign Inc.	New	0.17%	+0.17
TSCO Tractor Supply Company	Add +473.5%	0.20%	+0.16
ORCL Oracle Corp.	Add +41.2%	0.60%	+0.15
RMBS Rambus Inc.	Add +54.0%	0.32%	+0.15
AJG Arthur J Gallagher & Co.	Add +51.0%	0.43%	+0.14
FLYW Flywire Corp.-Voting	Add +4.6%	0.58%	+0.12
V Visa Inc. Class A	Add +0.3%	1.24%	+0.12
IRTC Irhythm Holdings Inc.	Add +44.9%	0.30%	+0.12
FOUR SHIFT4 Payments Inc. Class A	Add +6.6%	0.70%	+0.12
PRIM Primoris Services Corp.	New	0.12%	+0.12
EXTR Extreme Networks Inc.	New	0.11%	+0.11
PLMR Palomar Holdings Inc.	Add +50.5%	0.27%	+0.10
ANF Abercrombie & Fitch Co. Class A	Add +27.8%	0.43%	+0.10
VST Vistra Corp.	Add +41.3%	0.28%	+0.10

All Filings

Quarter	Positions	13F Reported Value	Top Holdings
Q2 2026	278	$30.6B	NVDA, GOOGL, ASND, AXON, FTAI
Q1 2026	250	$23.8B	NVDA, ASND, FIX, AAPL, FTAI
Q4 2025	241	$24.0B	NVDA, ASND, AAPL, MSFT, GOOGL
Q3 2025	235	$23.8B	NVDA, ASND, MSFT, AAPL, FIX
Q2 2025	239	$23.8B	NVDA, ASND, MSFT, AAPL, AMZN
Q1 2025	244	$20.5B	ASND, NVDA, AAPL, MSFT, AMZN
Q4 2024	239	$23.0B	NVDA, AAPL, MSFT, ASND, AMZN
Q3 2024	247	$22.1B	NVDA, AAPL, MSFT, ASND, AMZN
Q2 2024	248	$20.4B	NVDA, MSFT, AAPL, ASND, AMZN
Q1 2024	244	$19.0B	MSFT, ASND, AAPL, NVDA, AMZN