Holders — by stockHoldings — by fund
WESTFIELD CAPITAL MANAGEMENT CO LP
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0001177719
$30.61B
disclosed book value
278
positions
5.3%
largest position share
Positions, as of 2026-06-30
top 100 of 278 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | NVDANVIDIA CORPORATION | 8.1M | $1.62B | 5.3% |
| 2 | GOOGLALPHABET INC | 3.7M | $1.34B | 4.4% |
| 3 | ASNDASCENDIS PHARMA A/S | 4.8M | $1.28B | 4.2% |
| 4 | AXONAXON ENTERPRISE INC | 1.5M | $836.1M | 2.7% |
| 5 | FTAIFTAI AVIATION LTD | 2.9M | $794.6M | 2.6% |
| 6 | AAPLAPPLE INC | 2.6M | $744.7M | 2.4% |
| 7 | FIXCOMFORT SYS USA INC | 355,433 | $704.5M | 2.3% |
| 8 | AVGOBROADCOM INC | 1.6M | $588.0M | 1.9% |
| 9 | MSFTMICROSOFT CORP | 1.4M | $527.6M | 1.7% |
| 10 | HWMHOWMET AEROSPACE INC | 1.9M | $516.6M | 1.7% |
| 11 | LLYELI LILLY & CO | 416,732 | $499.8M | 1.6% |
| 12 | SNOWSNOWFLAKE INC | 1.7M | $441.9M | 1.4% |
| 13 | MKSIMKS INC. | 928,617 | $413.0M | 1.3% |
| 14 | METAMETA PLATFORMS INC | 677,389 | $381.6M | 1.2% |
| 15 | VRTVERTIV HOLDINGS CO | 1.1M | $353.0M | 1.2% |
| 16 | GEVGE VERNOVA INC | 241,272 | $283.5M | 0.9% |
| 17 | MUMICRON TECHNOLOGY INC | 228,203 | $263.4M | 0.9% |
| 18 | VVISA INC | 762,403 | $261.6M | 0.9% |
| 19 | APGAPI GROUP CORP | 6.2M | $260.6M | 0.9% |
| 20 | TPRTAPESTRY INC | 1.7M | $248.3M | 0.8% |
| 21 | RYTMRHYTHM PHARMACEUTICALS INC | 2.2M | $245.2M | 0.8% |
| 22 | LTHLIFE TIME GROUP HOLDINGS INC | 6.0M | $244.8M | 0.8% |
| 23 | TSMTAIWAN SEMICONDUCTOR MANUFAC | 510,999 | $244.0M | 0.8% |
| 24 | GHGUARDANT HEALTH INC | 1.6M | $243.7M | 0.8% |
| 25 | PWRQUANTA SVCS INC | 331,489 | $238.7M | 0.8% |
| 26 | NOWSERVICENOW INC | 2.4M | $235.7M | 0.8% |
| 27 | AMDADVANCED MICRO DEVICES INC | 403,081 | $234.2M | 0.8% |
| 28 | PANWPALO ALTO NETWORKS INC | 658,331 | $224.5M | 0.7% |
| 29 | WWDWOODWARD INC | 526,505 | $224.0M | 0.7% |
| 30 | ANETARISTA NETWORKS INC | 1.3M | $223.7M | 0.7% |
| 31 | LPLALPL FINL HLDGS INC | 793,061 | $223.4M | 0.7% |
| 32 | RKLBROCKET LAB CORP | 2.1M | $214.9M | 0.7% |
| 33 | ASAMER SPORTS INC | 6.3M | $214.7M | 0.7% |
| 34 | NETCLOUDFLARE INC | 835,502 | $204.9M | 0.7% |
| 35 | AMZNAMAZON COM INC | 859,806 | $204.9M | 0.7% |
| 36 | GRMNGARMIN LTD | 861,057 | $204.5M | 0.7% |
| 37 | RRXREGAL REXNORD CORPORATION | 856,976 | $204.1M | 0.7% |
| 38 | NTRANATERA INC | 726,628 | $197.2M | 0.6% |
| 39 | MSMORGAN STANLEY | 940,560 | $196.6M | 0.6% |
| 40 | CRSCARPENTER TECHNOLOGY CORP | 314,082 | $193.7M | 0.6% |
| 41 | IOTSAMSARA INC | 5.8M | $189.3M | 0.6% |
| 42 | DTDYNATRACE INC | 4.2M | $186.6M | 0.6% |
| 43 | CATCATERPILLAR INC | 174,620 | $186.0M | 0.6% |
| 44 | SMTCSEMTECH CORP | 1.1M | $183.4M | 0.6% |
| 45 | AMEAMETEK INC | 723,798 | $175.1M | 0.6% |
| 46 | ABVXABIVAX SA | 1.3M | $174.5M | 0.6% |
| 47 | INSMINSMED INC | 1.6M | $173.7M | 0.6% |
| 48 | ITTITT INC | 830,382 | $164.2M | 0.5% |
| 49 | GILDGILEAD SCIENCES INC | 1.3M | $162.7M | 0.5% |
| 50 | PTCTPTC THERAPEUTICS INC | 2.0M | $159.6M | 0.5% |
| 51 | BROSDUTCH BROS INC | 2.2M | $156.8M | 0.5% |
| 52 | CELHCELSIUS HLDGS INC | 5.3M | $155.9M | 0.5% |
| 53 | MTZMASTEC INC | 374,457 | $155.8M | 0.5% |
| 54 | SNSHARKNINJA INC | 1.0M | $153.5M | 0.5% |
| 55 | CSXCSX CORP | 3.2M | $149.9M | 0.5% |
| 56 | FCFSFIRSTCASH HOLDINGS INC | 693,085 | $149.9M | 0.5% |
| 57 | KEYKEYCORP | 6.5M | $149.7M | 0.5% |
| 58 | MCHPMICROCHIP TECHNOLOGY INC. | 1.6M | $149.5M | 0.5% |
| 59 | AMATAPPLIED MATLS INC | 205,592 | $148.6M | 0.5% |
| 60 | MARMARRIOTT INTL INC NEW | 398,962 | $147.9M | 0.5% |
| 61 | PCVXVAXCYTE INC | 2.5M | $143.7M | 0.5% |
| 62 | GLGLOBE LIFE INC | 770,990 | $137.8M | 0.4% |
| 63 | FTITECHNIPFMC PLC | 2.1M | $136.6M | 0.4% |
| 64 | XPOXPO INC | 629,011 | $129.1M | 0.4% |
| 65 | LEGNLEGEND BIOTECH CORP | 4.4M | $127.9M | 0.4% |
| 66 | PEVERPURE INC | 1.6M | $127.0M | 0.4% |
| 67 | LRCXLAM RESEARCH CORP | 285,614 | $123.8M | 0.4% |
| 68 | JLLJONES LANG LASALLE INC | 398,453 | $123.5M | 0.4% |
| 69 | ALABASTERA LABS INC | 249,299 | $120.4M | 0.4% |
| 70 | ROKROCKWELL AUTOMATION INC | 237,136 | $117.4M | 0.4% |
| 71 | IEXIDEX CORP | 513,564 | $116.6M | 0.4% |
| 72 | COHRCOHERENT CORP | 291,040 | $114.8M | 0.4% |
| 73 | LGNLEGENCE CORP | 1.3M | $114.4M | 0.4% |
| 74 | LECOLINCOLN ELEC HLDGS INC | 430,681 | $114.4M | 0.4% |
| 75 | ASMLASML HLDG NV | 57,430 | $114.3M | 0.4% |
| 76 | PLPLANET LABS PBC | 3.4M | $113.6M | 0.4% |
| 77 | ONTOONTO INNOVATION INC | 299,383 | $113.3M | 0.4% |
| 78 | CORCENCORA INC | 400,058 | $113.2M | 0.4% |
| 79 | RVMDREVOLUTION MEDICINES INC | 600,821 | $112.5M | 0.4% |
| 80 | SNDKSANDISK CORP | 49,024 | $111.5M | 0.4% |
| 81 | AFRMAFFIRM HLDGS INC | 1.4M | $110.3M | 0.4% |
| 82 | LYVLIVE NATION ENTERTAINMENT IN | 590,764 | $108.2M | 0.4% |
| 83 | NPOENPRO INC | 286,554 | $108.0M | 0.4% |
| 84 | PRPERMIAN RESOURCES CORP | 5.8M | $106.0M | 0.3% |
| 85 | ARESARES MANAGEMENT CORPORATION | 952,032 | $106.0M | 0.3% |
| 86 | IMAXIMAX CORP | 2.7M | $105.8M | 0.3% |
| 87 | GWREGUIDEWIRE SOFTWARE INC | 839,337 | $103.3M | 0.3% |
| 88 | NXTNEXTPOWER INC | 857,399 | $102.2M | 0.3% |
| 89 | FROGJFROG LTD | 1.1M | $101.3M | 0.3% |
| 90 | SNPSSYNOPSYS INC | 226,856 | $101.2M | 0.3% |
| 91 | ROKUROKU INC | 716,557 | $99.0M | 0.3% |
| 92 | PLXSPLEXUS CORP | 321,808 | $96.8M | 0.3% |
| 93 | AITAPPLIED INDL TECHNOLOGIES IN | 285,691 | $96.6M | 0.3% |
| 94 | MSCIMSCI INC | 171,958 | $96.3M | 0.3% |
| 95 | HOODROBINHOOD MKTS INC | 955,544 | $95.8M | 0.3% |
| 96 | ROSTROSS STORES INC | 442,420 | $94.2M | 0.3% |
| 97 | ADPTADAPTIVE BIOTECHNOLOGIES COR | 4.3M | $91.5M | 0.3% |
| 98 | XENEXENON PHARMACEUTICALS INC | 1.5M | $91.0M | 0.3% |
| 99 | ORLYOREILLY AUTOMOTIVE INC | 933,255 | $85.9M | 0.3% |
| 100 | CCITIGROUP INC | 608,124 | $85.1M | 0.3% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.