MondegarAI
WESTFIELD CAPITAL MANAGEMENT CO LP

Q1 2026 · 13F-HR

WESTFIELD CAPITAL MANAGEMENT CO LPholdings as filed

Filed 2026-05-11 · accession 0001177719-26-000018

$23.83B
Reported value
250
Positions
2026-03-31
Period end
View analyzed profile →PRO

The Brief · WESTFIELD CAPITAL MANAGEMENT CO LP · Q1 2026

AI · grounded in 13F

WESTFIELD CAPITAL MANAGEMENT CO LP closed its position in CVLT for a reduction of $132.5M. The fund also exited its position in TEAM for $131.7M and established new positions in LNG for $130.3M and AS for $129.6M. Additionally, the manager increased its stake in INSM by 239.5% and reduced its holding in MASI by 77.6%.

Holdings as filed

CUSIPTickerIssuerValue% port.SharesClassVoting
67066G104NVDANVIDIA CORPORATION$1.10B4.62%6,317,039CommonSOLE
04351P101ASNDUSDASCENDIS PHARMA A/S$1.10B4.62%4,813,440CommonSOLE
199908104FIXCOMFORT SYS USA INC$856.2M3.59%620,915CommonSOLE
037833100AAPLAPPLE INC$795.2M3.34%3,133,113CommonSOLE
G3730V105FTAIFTAI AVIATION LTD$697.8M2.93%2,848,227CommonSOLE
594918104MSFTMICROSOFT CORP$610.6M2.56%1,649,513CommonSOLE
02079K305GOOGLALPHABET INC$582.8M2.45%2,026,744CommonSOLE
443201108HWMHOWMET AEROSPACE INC$527.7M2.21%2,289,697CommonSOLE
92537N108VRTVERTIV HOLDINGS CO$481.5M2.02%1,921,696CommonSOLE
023135106AMZNAMAZON COM INC$474.8M1.99%2,279,654CommonSOLE
05464C101AXONAXON ENTERPRISE INC$451.9M1.90%1,064,134CommonSOLE
11135F101AVGOBROADCOM INC$382.8M1.61%1,236,925CommonSOLE
532457108LLYELI LILLY & CO$335.3M1.41%364,579CommonSOLE
876030107TPRTAPESTRY INC$310.3M1.30%2,198,862CommonSOLE
30303M102METAMETA PLATFORMS INC$301.4M1.26%526,822CommonSOLE
50212V100LPLALPL FINL HLDGS INC$265.2M1.11%881,506CommonSOLE
55306N104MKSIMKS INC.$240.6M1.01%1,046,763CommonSOLE
457669307INSMINSMED INC$240.1M1.01%1,468,459CommonSOLE
92243G108PCVXVAXCYTE INC$211.9M0.89%3,646,138CommonSOLE
773121108RKLBROCKET LAB CORP$203.7M0.85%3,172,611CommonSOLE
64110L106NFLXNETFLIX INC.$189.4M0.79%1,969,994CommonSOLE
00187Y100APGAPI GROUP CORP$187.8M0.79%4,634,929CommonSOLE
74762E102QUREQUANTA SVCS INC$182.2M0.76%331,816CommonSOLE
36828A101GEVGE VERNOVA INC$174.0M0.73%199,306CommonSOLE
03990B101ARESARES MANAGEMENT CORPORATION$171.6M0.72%1,572,787CommonSOLE
76243J105RYTMRHYTHM PHARMACEUTICALS INC$167.8M0.70%1,929,123CommonSOLE
874039100TSMTAIWAN SEMICONDUCTOR MANUFAC$166.8M0.70%493,504CommonSOLE
573874104MRVLMARVELL TECHNOLOGY INC$165.7M0.70%1,673,381CommonSOLE
093712107BEBLOOM ENERGY CORP$161.4M0.68%1,191,572CommonSOLE
79589L106IOTSAMSARA INC$160.8M0.67%5,072,821CommonSOLE
031100100AMEAMETEK INC$159.9M0.67%745,832CommonSOLE
71424F105PRPERMIAN RESOURCES CORP$159.5M0.67%7,481,457CommonSOLE
268150109DTDYNATRACE INC$155.7M0.65%4,209,594CommonSOLE
76155X100RVMDREVOLUTION MEDICINES INC$151.4M0.64%1,556,578CommonSOLE
632307104NTRANATERA INC$150.9M0.63%754,729CommonSOLE
G3323L100FNFABRINET$148.6M0.62%284,874CommonSOLE
00370M103ABVXABIVAX SA$147.3M0.62%1,322,938CommonSOLE
81762P102NOWSERVICENOW INC$145.8M0.61%1,394,187CommonSOLE
G87110105FTITECHNIPFMC PLC$140.6M0.59%2,033,755CommonSOLE
V7780T103RCLROYAL CARIBBEAN GROUP$139.2M0.58%505,765CommonSOLE
43300A203HLTHILTON WORLDWIDE HLDGS INC$139.1M0.58%457,425CommonSOLE
92826C839VVISA INC$138.0M0.58%456,548CommonSOLE
03073E105CORCENCORA INC$137.3M0.58%436,909CommonSOLE
45073V108ITTITT INC$134.0M0.56%703,309CommonSOLE
15118V207CELHCELSIUS HLDGS INC$133.7M0.56%3,768,911CommonSOLE
65290E101NXTNEXTPOWER INC$133.5M0.56%1,107,346CommonSOLE
16411R208LNGCHENIERE ENERGY INC$130.3M0.55%459,044CommonSOLE
G0260P102ASAMER SPORTS INC$129.6M0.54%3,937,521CommonSOLE
758750103RRXREGAL REXNORD CORPORATION$127.7M0.54%681,717CommonSOLE
55354G100MSCIMSCI INC$126.0M0.53%233,764CommonSOLE
40131M109GHGUARDANT HEALTH INC$125.9M0.53%1,362,539CommonSOLE
538034109LYVLIVE NATION ENTERTAINMENT IN$123.6M0.52%810,710CommonSOLE
88160R101TSLATESLA INC$117.5M0.49%316,102CommonSOLE
37959E102GLGLOBE LIFE INC$117.2M0.49%842,423CommonSOLE
26701L100BROSDUTCH BROS INC$117.2M0.49%2,313,357CommonSOLE
18915M107NETCLOUDFLARE INC$111.7M0.47%541,566CommonSOLE
77543R102ROKUROKU INC$111.5M0.47%1,178,219CommonSOLE
983793100XPOXPO INC$111.3M0.47%571,992CommonSOLE
316773100FITBFIFTH THIRD BANCORP$110.8M0.46%2,385,422CommonSOLE
74624M102PEVERPURE INC$110.7M0.46%1,874,763CommonSOLE
50077B207KTOSKRATOS DEFENSE & SEC SOLUTIO$110.2M0.46%1,563,146CommonSOLE
026874784AIGAMERICAN INTL GROUP INC$109.8M0.46%1,458,711CommonSOLE
833445109SNOWSNOWFLAKE INC$108.4M0.45%718,810CommonSOLE
74164F103PRIMPRIMORIS SVCS CORP$106.3M0.45%743,269CommonSOLE
48020Q107JLLJONES LANG LASALLE INC$105.8M0.44%347,779CommonSOLE
52476L109LGNLEGENCE CORP$105.1M0.44%1,861,653CommonSOLE
52490G102LEGNLEGEND BIOTECH CORP$104.3M0.44%5,763,475CommonSOLE
493267108KEYKEYCORP$104.1M0.44%5,193,334CommonSOLE
778296103ROSTROSS STORES INC$102.2M0.43%471,916CommonSOLE
69753M105PLMRPALOMAR HLDGS INC$102.1M0.43%854,116CommonSOLE
697435105PANWPALO ALTO NETWORKS INC$102.0M0.43%636,483CommonSOLE
25278X109FANGDIAMONDBACK ENERGY INC$99.6M0.42%503,474CommonSOLE
69608A108PLTRPALANTIR TECHNOLOGIES INC$98.7M0.41%674,557CommonSOLE
816850101SMTCSEMTECH CORP$98.5M0.41%1,280,594CommonSOLE
980745103WWDWOODWARD INC$97.4M0.41%272,185CommonSOLE
040413205ANETARISTA NETWORKS INC$95.8M0.40%780,402CommonSOLE
053332102AZOAUTOZONE INC$95.8M0.40%28,363CommonSOLE
G8068L108SNSHARKNINJA INC$95.8M0.40%904,541CommonSOLE
19247G107COHRCOHERENT CORP$94.5M0.40%396,644CommonSOLE
04626A103ALABASTERA LABS INC$94.3M0.40%860,113CommonSOLE
10576N102BRZEBRAZE INC$93.8M0.39%3,973,906CommonSOLE
466313103JBLJABIL INC$92.8M0.39%349,209CommonSOLE
533900106LECOLINCOLN ELEC HLDGS INC$89.2M0.37%358,165CommonSOLE
45245E109IMAXIMAX CORP$88.9M0.37%2,338,776CommonSOLE
81663L200WGSGENEDX HOLDINGS CORP$87.9M0.37%1,369,108CommonSOLE
H2906T109GRMNGARMIN LTD$87.3M0.37%376,362CommonSOLE
G25457105CRDOCREDO TECHNOLOGY GROUP HOLDI$86.9M0.36%926,219CommonSOLE
315616102FFIVF5 INC$86.4M0.36%298,542CommonSOLE
27579R104EWBCEAST WEST BANCORP INC$86.0M0.36%805,956CommonSOLE
53190C102LTHLIFE TIME GROUP HOLDINGS INC$85.8M0.36%3,185,515CommonSOLE
M2029K104BIRKBIRKENSTOCK HOLDING PLC$83.8M0.35%2,338,779CommonSOLE
67103H107ORLYOREILLY AUTOMOTIVE INC$82.0M0.34%887,999CommonSOLE
617446448MSMORGAN STANLEY$81.7M0.34%496,558CommonSOLE
98420N105XENEXENON PHARMACEUTICALS INC$81.5M0.34%1,401,483CommonSOLE
02043Q107ALNYALNYLAM PHARMACEUTICALS INC$81.2M0.34%245,539CommonSOLE
33768G107FCFSFIRSTCASH HOLDINGS INC$81.2M0.34%431,993CommonSOLE
45167R104IEXIDEX CORP$80.8M0.34%426,019CommonSOLE
576323109MTZMASTEC INC$80.4M0.34%249,980CommonSOLE
441593100HLIHOULIHAN LOKEY INC$78.1M0.33%543,611CommonSOLE
729132100PLXSPLEXUS CORP$77.9M0.33%384,493CommonSOLE
485924104KRMNKARMAN HLDGS INC$77.2M0.32%964,305CommonSOLE
03820C105AITAPPLIED INDL TECHNOLOGIES IN$76.7M0.32%289,201CommonSOLE
87612G101TRGPTARGA RES CORP$76.5M0.32%304,997CommonSOLE
13100M509CALXCALIX INC$75.7M0.32%1,546,101CommonSOLE
00650F109ADPTADAPTIVE BIOTECHNOLOGIES COR$75.5M0.32%5,436,718CommonSOLE
983134107WYNNWYNN RESORTS LTD$75.1M0.32%740,013CommonSOLE
184496107CLHCLEAN HARBORS INC$74.9M0.31%261,092CommonSOLE
45168D104IDXXIDEXX LABS INC$74.7M0.31%132,860CommonSOLE
92840M102VSTVISTRA CORP$74.4M0.31%494,875CommonSOLE
773903109ROKROCKWELL AUTOMATION INC$74.0M0.31%206,277CommonSOLE
40171V100GWREGUIDEWIRE SOFTWARE INC$72.8M0.31%486,581CommonSOLE
12541W209CHRWC H ROBINSON WORLDWIDE IN$71.3M0.30%429,500CommonSOLE
548661107LOWLOWES COS INC$71.1M0.30%300,962CommonSOLE
N62509109NAMSNEWAMSTERDAM PHARMA COMPANY$70.5M0.30%2,202,913CommonSOLE
126408103CSXCSX CORP$68.1M0.29%1,658,299CommonSOLE
683344105ONTOONTO INNOVATION INC$67.0M0.28%326,960CommonSOLE
25809K105DASHDOORDASH INC$66.7M0.28%443,921CommonSOLE
75700L108RRRRED ROCK RESORTS INC$65.5M0.27%1,228,158CommonSOLE
147448104CWSTCASELLA WASTE SYS INC$65.3M0.27%822,492CommonSOLE
695156109PKGPACKAGING CORP AMER$64.5M0.27%303,771CommonSOLE
97650W108WTFCWINTRUST FINL CORP$63.2M0.27%455,222CommonSOLE
595017104MCHPMICROCHIP TECHNOLOGY INC.$62.7M0.26%970,295CommonSOLE
574795100MASIMASIMO CORP$60.7M0.25%341,229CommonSOLE
98980G102ZSZSCALER INC$60.0M0.25%427,919CommonSOLE
42226A107HQYHEALTHEQUITY INC$59.6M0.25%712,848CommonSOLE
249906108DSGXDESCARTES SYS GROUP INC$57.4M0.24%801,902CommonSOLE
74275K108PCORPROCORE TECHNOLOGIES INC$57.1M0.24%1,001,253CommonSOLE
05368V106AVNTAVIENT CORPORATION$57.0M0.24%1,569,468CommonSOLE
443573100HUBSHUBSPOT INC$56.9M0.24%232,976CommonSOLE
85914M107STEPSTEPSTONE GROUP INC$56.2M0.24%1,177,971CommonSOLE
45780R101IBPINSTALLED BLDG PRODS INC$55.2M0.23%208,248CommonSOLE
92846Q107COCOVITA COCO CO INC$55.2M0.23%1,151,933CommonSOLE
78709Y105SAIASAIA INC$54.7M0.23%155,600CommonSOLE
615369105MCOMOODYS CORP$53.9M0.23%123,603CommonSOLE
871607107SNPSSYNOPSYS INC$52.7M0.22%132,848CommonSOLE
701094104PHPARKER-HANNIFIN CORP$52.4M0.22%58,489CommonNONE
518415104LSCCLATTICE SEMICONDUCTOR CORP$52.3M0.22%563,422CommonSOLE
89055F103BLDTOPBUILD COR$52.2M0.22%148,581CommonSOLE
060505104BACBANK AMERICA CORP$52.0M0.22%1,066,885CommonNONE
377322102GKOSGLAUKOS CORP$51.9M0.22%482,219CommonSOLE
48251W104KKRKKR & CO INC$51.6M0.22%558,136CommonSOLE
192108504CDECOEUR MNG INC$51.4M0.22%2,738,846CommonSOLE
79466L302CRMSALESFORCE INC$50.8M0.21%271,963CommonSOLE
571903202MARMARRIOTT INTL INC NEW$50.1M0.21%153,219CommonSOLE
558868105MDGLMADRIGAL PHARMACEUTICALS INC$49.6M0.21%94,813CommonSOLE
00827B106AFRMAFFIRM HLDGS INC$49.5M0.21%1,080,636CommonSOLE
N6596X109NXPINXP SEMICONDUCTORS N V$48.8M0.20%247,996CommonSOLE
445658107JBHTHUNT J B TRANS SVCS INC$48.4M0.20%228,577CommonSOLE
258278100DORMDORMAN PRODS INC$48.1M0.20%461,282CommonSOLE
888787108TOSTTOAST INC$47.5M0.20%1,790,873CommonSOLE
72703X106PLPLANET LABS PBC$45.8M0.19%1,637,041CommonSOLE
09073M104TECHBIO-TECHNE CORP$44.7M0.19%856,043CommonSOLE
770700102HOODROBINHOOD MKTS INC$43.9M0.18%633,384CommonSOLE
29362U104ENTGENTEGRIS INC$43.6M0.18%371,686CommonSOLE
767292105RIOTRIOT PLATFORMS INC$43.3M0.18%3,499,880CommonSOLE
303250104FICOFAIR ISAAC CORP$42.6M0.18%39,934CommonSOLE
87422Q109TLNTALEN ENERGY CORP$42.0M0.18%131,461CommonSOLE
219948106CPAYCORPAY INC$41.6M0.17%143,120CommonSOLE
60937P106MDBMONGODB INC$40.4M0.17%164,881CommonSOLE
46222L108IONQIONQ INC$39.6M0.17%1,373,788CommonSOLE
407497106HLNEHAMILTON LANE INC$36.2M0.15%364,174CommonSOLE
595112103MUMICRON TECHNOLOGY INC$33.9M0.14%100,434CommonSOLE
35671D857FCXFREEPORT MCMORAN INC$32.0M0.13%544,359CommonSOLE
68404L201OPCHOPTION CARE HEALTH INC$31.8M0.13%1,182,814CommonSOLE
52603A208LCLENDINGCLUB ISSUANCE TR SER$30.3M0.13%2,117,543CommonSOLE
78473E103SPXCSPX TECHNOLOGIES INC$29.8M0.13%149,276CommonSOLE
750491102RDNTRADNET INC$29.7M0.12%531,893CommonSOLE
311900104FASTFASTENAL CO$29.6M0.12%638,334CommonSOLE
55405Y100MTSIMACOM TECH SOLUTIONS HLDGS I$29.4M0.12%132,457CommonSOLE
76655K103RGTIRIGETTI COMPUTING INC$26.6M0.11%1,895,313CommonSOLE
149123101CATCATERPILLAR INC$22.9M0.10%32,325CommonSOLE
21874A106CORZCORE SCIENTIFIC INC NEW$22.1M0.09%1,480,013CommonSOLE
916896103UECURANIUM ENERGY CORP$21.2M0.09%1,567,772CommonSOLE
235851102DHRDANAHER CORP DEL$20.9M0.09%110,492CommonSOLE
687604108ORKAORUKA THERAPEUTICS INC$15.4M0.06%313,130CommonSOLE
893641100TDGTRANSDIGM GROUP INC$15.0M0.06%12,950CommonSOLE
70339W104PTRNPATTERN GROUP INC$14.6M0.06%1,172,891CommonSOLE
02079K107GOOGALPHABET INC$14.5M0.06%50,487CommonSOLE
624756102MLIMUELLER INDS INC$14.0M0.06%126,059CommonSOLE
969457100WMBWILLIAMS COS INC$13.2M0.06%181,444CommonSOLE
038169207APLDAPPLIED DIGITAL CORP$12.9M0.05%542,092CommonSOLE
171779309CIENCIENA CORP$12.3M0.05%31,750CommonSOLE
191216100KOCOCA COLA CO$10.2M0.04%133,867CommonSOLE
86562M209SMFGSUMITOMO MITSUI FIN GRP INC$9.0M0.04%457,584CommonSOLE
931142103WMTWALMART INC$8.9M0.04%71,561CommonSOLE
478160104JNJJOHNSON & JOHNSON$8.8M0.04%35,912CommonSOLE
606822104MUFGMITSUBISHI UFJ FINANCIAL GRO$8.8M0.04%516,054CommonSOLE
231021106CMICUMMINS INC$8.3M0.03%15,415CommonSOLE
65339F101NEENEXTERA ENERGY INC$8.1M0.03%87,251CommonSOLE
872540109TJXTJX COS INC NEW$7.8M0.03%48,621CommonSOLE
949746101WMT2WELLS FARGO & CO$7.0M0.03%87,713CommonSOLE
775711104ROLROLLINS INC$7.0M0.03%130,617CommonSOLE
437076102HDHOME DEPOT INC$6.7M0.03%20,405CommonSOLE
883556102TMOTHERMO FISHER SCIENTIFIC INC$6.6M0.03%13,474CommonSOLE
G8994E103TTTRANE TECHNOLOGIES PLC$6.6M0.03%15,841CommonSOLE
55261F104MTBM & T BK CORP$6.2M0.03%29,839CommonSOLE
427866108HSYHERSHEY CO$6.1M0.03%29,158CommonSOLE
31946M103FCNCAFIRST CTZNS BANCSHARES INC D$6.0M0.03%3,185CommonSOLE
031162100AMGNAMGEN INC$6.0M0.03%17,052CommonSOLE
38141G104GSGOLDMAN SACHS GROUP INC$6.0M0.03%7,074CommonSOLE
58155Q103MCKMCKESSON CORP$6.0M0.03%6,901CommonSOLE
05946K101BBVABANCO BILBAO VIZCAYA ARGENTA$5.8M0.02%268,690CommonSOLE
754730109RJFRAYMOND JAMES FINL INC$5.8M0.02%40,095CommonSOLE
580135101MCDMCDONALDS CORP$5.6M0.02%18,034CommonSOLE
G5960L103MDTMEDTRONIC PLC$5.2M0.02%60,349CommonSOLE
58933Y105MRKMERCK & CO INC$5.2M0.02%42,901CommonSOLE
172967424CCITIGROUP INC$5.0M0.02%44,457CommonSOLE
422806208HEI/AHEICO CORP NEW$4.2M0.02%20,130CommonSOLE
84265V105SCCOSOUTHERN COPPER CORP$4.2M0.02%24,124CommonSOLE
30212P303EXPEEXPEDIA GROUP INC$3.9M0.02%16,692CommonSOLE
717081103PFEPFIZER INC$3.8M0.02%133,734CommonSOLE
375558103GILDGILEAD SCIENCES INC$3.7M0.02%26,690CommonSOLE
942622200WSOWATSCO INC$3.6M0.01%9,822CommonSOLE
713448108PEPPEPSICO INC$3.5M0.01%22,760CommonSOLE
25746U109DDOMINION ENERGY INC$3.3M0.01%53,262CommonSOLE
14149Y108CAHCARDINAL HEALTH INC$2.8M0.01%13,043CommonSOLE
00287Y109ABBVABBVIE INC$2.3M0.01%10,619CommonSOLE
366651107ITGARTNER INC$2.3M0.01%14,370CommonSOLE
46120E602ISRGINTUITIVE SURGICAL INC$1.9M0.01%4,036CommonSOLE
464287614IWFISHARES TR$1.7M0.01%4,085CommonSOLE
252131107DXCMDEXCOM INC$1.7M0.01%27,074CommonSOLE
75321W103PACKRANPAK HOLDINGS CORP$1.5M0.01%407,328CommonSOLE
750917106RMBSRAMBUS INC DEL$1.2M0.01%14,436CommonSOLE
922908736VUGVANGUARD INDEX FDS$1.1M0.00%2,443CommonSOLE
464287481IWPISHARES TR$1.1M0.00%8,299CommonSOLE
007903107AMDADVANCED MICRO DEVICES INC$1.0M0.00%5,020CommonSOLE
M7S64H106MNDYMONDAY COM LTD$924,0010.00%13,370CommonSOLE
G3934V109GENIGENIUS SPORTS LIMITED$917,6750.00%207,150CommonSOLE
459200101IBMINTERNATIONAL BUSINESS MACHS$804,7350.00%3,320CommonSOLE
91324P102UNHUNITEDHEALTH GROUP INC$748,7230.00%2,767CommonNONE
464287309IVWISHARES TR$733,7310.00%6,487CommonSOLE
94106B101WCNWASTE CONNECTIONS INC$725,4570.00%4,466CommonSOLE
26884L109EQTEQT CORP$677,1300.00%10,640CommonSOLE
670100205NVONOVO-NORDISK A S$628,7190.00%17,108CommonSOLE
929740108WABWABTEC$622,2760.00%2,490CommonSOLE
03831W108APPAPPLOVIN CORP$501,4800.00%1,260CommonSOLE
464287606IJKISHARES TR$493,5360.00%4,905CommonSOLE
92532F100VRTXVERTEX PHARMACEUTICALS INC$385,8110.00%864CommonSOLE
101137107BSXBOSTON SCIENTIFIC CORP$374,3040.00%5,965CommonSOLE
45784P101PODDINSULET CORP$352,8940.00%1,682CommonSOLE
218937100CNRCORE NATURAL RESOURCES INC$351,8930.00%3,360CommonSOLE
13321L108CCJCAMECO CORP$337,7770.00%3,110CommonSOLE
038222105AMATAPPLIED MATLS INC$319,9150.00%936CommonSOLE
462222100IONSIONIS PHARMACEUTICALS INC$262,9650.00%3,502CommonSOLE
80706P103SRRKSCHOLAR ROCK HLDG CORP$254,7470.00%5,182CommonSOLE
05338F306AVTXAVALO THERAPEUTICS INC$233,4900.00%15,639CommonSOLE
85254J102STAGSTAG INDUSTRIAL INC$233,2000.00%6,467CommonSOLE
74006W207PRAXPRAXIS PRECISION MEDICINES I$213,2900.00%662CommonSOLE
45258J102IMVTIMMUNOVANT INC$213,1520.00%8,581CommonSOLE
745848101LUNGPULMONX CORP$141,9000.00%110,000CommonSOLE

Source: SEC EDGAR · raw 13F holdings as filed. The Class column shows the option type when reported (Put/Call) or Common when the issuer's equity is held directly. 13F discloses long positions only.