← Back to Discover
WESTFIELD CAPITAL MANAGEMENT CO LP
Period ended Jun 30, 2026 · Latest filing Aug 12, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Jun 30, 2026: $30,614,527,190
More quarters will appear as history becomes available.
Top holdings
Top 10 at Jun 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- NVIDIA CORPORATION · COM · 67066G104 · shares: $1,616,712,338
- ALPHABET INC · CAP STK CL A · 02079K305 · shares: $1,339,806,415
- ASCENDIS PHARMA A/S · ORD SHS · K08588103 · shares: $1,279,793,795
- AXON ENTERPRISE INC · COM · 05464C101 · shares: $836,144,444
- FTAI AVIATION LTD · SHS · G3730V105 · shares: $794,608,199
- APPLE INC · COM · 037833100 · shares: $744,747,287
- COMFORT SYS USA INC · COM · 199908104 · shares: $704,451,409
- BROADCOM INC · COM · 11135F101 · shares: $587,976,343
- MICROSOFT CORP · COM · 594918104 · shares: $527,559,770
- HOWMET AEROSPACE INC · COM · 443201108 · shares: $516,608,027
Reported holdings
278 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| PACKAGING CORP AMER | COM | 695156109 | — | 356,291 shares | $84,897,019 |
| BIRKENSTOCK HOLDING PLC | COM SHS | M2029K104 | — | 1,967,122 shares | $84,645,260 |
| PALOMAR HLDGS INC | COM | 69753M105 | — | 668,854 shares | $84,536,457 |
| EAST WEST BANCORP INC | COM | 27579R104 | — | 649,641 shares | $83,862,157 |
| RED ROCK RESORTS INC | CL A | 75700L108 | — | 1,261,559 shares | $82,077,029 |
| WINTRUST FINL CORP | COM | 97650W108 | — | 504,042 shares | $81,009,630 |
| CLEAN HARBORS INC | COM | 184496107 | — | 268,348 shares | $80,168,965 |
| CASELLA WASTE SYS INC | CL A | 147448104 | — | 812,525 shares | $78,790,549 |
| TTM TECHNOLOGIES INC | COM | 87305R109 | — | 416,052 shares | $77,810,045 |
| TARGA RES CORP | COM | 87612G101 | — | 287,128 shares | $76,990,519 |
| FORGENT POWER SOLUTIONS INC | COM SHS CL A | 34631F102 | — | 1,370,928 shares | $76,580,038 |
| ALNYLAM PHARMACEUTICALS INC | COM | 02043Q107 | — | 252,383 shares | $75,974,872 |
| VITA COCO CO INC | COM | 92846Q107 | — | 1,137,802 shares | $75,254,224 |
| RUBRIK INC. | CL A | 781154109 | — | 937,308 shares | $75,247,086 |
| AUTOZONE INC | COM | 053332102 | — | 23,395 shares | $74,769,700 |
| DOORDASH INC | CL A | 25809K105 | — | 401,737 shares | $74,132,450 |
| WYNN RESORTS LTD | COM | 983134107 | — | 761,352 shares | $73,919,666 |
| IDEXX LABS INC | COM | 45168D104 | — | 139,925 shares | $73,662,240 |
| SPROUTS FMRS MKT INC | COM | 85208M102 | — | 866,638 shares | $73,300,242 |
| PRAXIS PRECISION MEDICINES I | COM NEW | 74006W207 | — | 218,898 shares | $73,284,861 |
| SALESFORCE INC | COM | 79466L302 | — | 467,006 shares | $73,161,088 |
| PRIMORIS SVCS CORP | COM | 74164F103 | — | 737,493 shares | $73,100,306 |
| NUVALENT INC | COM | 670703107 | — | 585,583 shares | $72,319,501 |
| DYCOM INDS INC | COM | 267475101 | — | 141,978 shares | $71,782,657 |
| STEPSTONE GROUP INC | COM CL A | 85914M107 | — | 1,729,424 shares | $71,528,977 |
| HUNT J B TRANS SVCS INC | COM | 445658107 | — | 245,804 shares | $71,142,938 |
| VISTRA CORP | COM | 92840M102 | — | 445,739 shares | $70,707,506 |
| GLAUKOS CORP | COM | 377322102 | — | 483,411 shares | $67,561,521 |
| MACOM TECH SOLUTIONS HLDGS I | COM | 55405Y100 | — | 175,952 shares | $66,926,743 |
| TERADYNE INC | COM | 880770102 | — | 136,491 shares | $66,039,624 |
| SAIA INC | COM | 78709Y105 | — | 153,571 shares | $64,677,962 |
| NXP SEMICONDUCTORS N V | COM | N6596X109 | — | 227,356 shares | $63,893,952 |
| SENSATA TECHNOLOGIES HLDG PL | SHS | G8060N102 | — | 1,333,853 shares | $63,678,142 |
| HEALTHEQUITY INC | COM | 42226A107 | — | 703,313 shares | $63,523,230 |
| BRIGHTSPRING HEALTH SVCS INC | COM | 10950A106 | — | 897,804 shares | $62,612,851 |
| RELAY THERAPEUTICS INC | COM | 75943R102 | — | 3,343,496 shares | $62,556,810 |
| HOULIHAN LOKEY INC | CL A | 441593100 | — | 463,415 shares | $62,157,854 |
| ENTEGRIS INC | COM | 29362U104 | — | 344,956 shares | $62,043,788 |
| CORE SCIENTIFIC INC NEW | COM | 21874A106 | — | 2,409,894 shares | $61,669,187 |
| RADNET INC | COM | 750491102 | — | 975,542 shares | $60,161,675 |
| ORUKA THERAPEUTICS INC | COM | 687604108 | — | 631,433 shares | $60,093,479 |
| CREDO TECHNOLOGY GROUP HOLDI | ORDINARY SHARES | G25457105 | — | 216,976 shares | $59,006,708 |
| BUILDERS FIRSTSOURCE INC | COM | 12008R107 | — | 656,421 shares | $58,736,551 |
| LATTICE SEMICONDUCTOR CORP | COM | 518415104 | — | 381,803 shares | $58,400,587 |
| DESCARTES SYS GROUP INC | COM | 249906108 | — | 835,437 shares | $57,845,658 |
| AVIENT CORPORATION | COM | 05368V106 | — | 1,549,939 shares | $57,285,745 |
| BRAZE INC | COM CL A | 10576N102 | — | 2,617,532 shares | $56,774,269 |
| FABRINET | SHS | G3323L100 | — | 97,376 shares | $54,732,897 |
| CHENIERE ENERGY INC | COM NEW | 16411R208 | — | 228,475 shares | $54,607,920 |
| INSULET CORP | COM | 45784P101 | — | 352,717 shares | $53,701,163 |
| ROBLOX CORP | CL A | 771049103 | — | 985,802 shares | $53,607,921 |
| ARGENX SE | SPONSORED ADR | 04016X101 | — | 57,082 shares | $52,958,761 |
| NEWAMSTERDAM PHARMA COMPANY | ORDINARY SHARES | N62509109 | — | 1,536,472 shares | $52,071,036 |
| JABIL INC | COM | 466313103 | — | 134,783 shares | $51,956,008 |
| TALEN ENERGY CORP | COM | 87422Q109 | — | 135,079 shares | $51,905,457 |
| HAPPEN INC | COM NEW | 52603A208 | — | 2,500,134 shares | $51,852,779 |
| RAMBUS INC DEL | COM | 750917106 | — | 385,811 shares | $51,212,552 |
| FLEX LTD | ORD | Y2573F102 | — | 314,008 shares | $50,891,259 |
| SPOTIFY TECHNOLOGY S A | SHS | L8681T102 | — | 110,179 shares | $50,586,408 |
| MADRIGAL PHARMACEUTICALS INC | COM | 558868105 | — | 93,931 shares | $50,436,250 |
| ANALOG DEVICES INC | COM | 032654105 | — | 126,445 shares | $50,220,312 |
| MONGODB INC | CL A | 60937P106 | — | 149,255 shares | $50,134,909 |
| NASDAQ INC | COM | 631103108 | — | 635,713 shares | $50,106,934 |
| HILTON WORLDWIDE HLDGS INC | COM | 43300A203 | — | 149,936 shares | $49,547,951 |
| CALIX INC | COM | 13100M509 | — | 1,324,534 shares | $49,431,609 |
| SEAGATE TECHNOLOGY HLDNGS PL | ORD SHS | G7997R103 | — | 50,734 shares | $48,958,249 |
| KEYSIGHT TECHNOLOGIES INC | COM | 49338L103 | — | 134,908 shares | $47,227,081 |
| CORNING INC | COM | 219350105 | — | 184,428 shares | $47,108,373 |
| LUMENTUM HLDGS INC | COM | 55024U109 | — | 53,807 shares | $46,169,789 |
| DORMAN PRODS INC | COM | 258278100 | — | 330,809 shares | $45,138,888 |
| COEUR MNG INC | COM NEW | 192108504 | — | 2,748,441 shares | $44,854,557 |
| CELCUITY INC | COM | 15102K100 | — | 417,816 shares | $43,711,910 |
| TARGET HOSPITALITY CORP | COM | 87615L107 | — | 2,103,813 shares | $42,833,633 |
| INDIVIOR PHARMACEUTICALS INC | COM | 45579U109 | — | 1,041,191 shares | $42,720,067 |
| MAREX GROUP PLC | ORD | G5S37H101 | — | 688,665 shares | $41,974,132 |
| PATTERN GROUP INC | COM SER A | 70339W104 | — | 1,656,169 shares | $41,718,897 |
| PENUMBRA INC | COM | 70975L107 | — | 131,394 shares | $41,487,656 |
| ROYAL CARIBBEAN GROUP | COM | V7780T103 | — | 128,165 shares | $40,696,378 |
| PROCORE TECHNOLOGIES INC | COM | 74275K108 | — | 989,417 shares | $40,190,119 |
| FIFTH THIRD BANCORP | COM | 316773100 | — | 711,015 shares | $40,079,931 |
| APPLIED DIGITAL CORP | COM NEW | 038169207 | — | 1,039,641 shares | $38,778,609 |
| IMPINJ INC | COM | 453204109 | — | 270,646 shares | $38,764,627 |
| FREEPORT MCMORAN INC | CL B | 35671D857 | — | 613,078 shares | $38,556,464 |
| TOAST INC | CL A | 888787108 | — | 1,373,221 shares | $38,203,008 |
| RIGETTI COMPUTING INC | COMMON STOCK | 76655K103 | — | 1,951,807 shares | $37,708,911 |
| DIAMONDBACK ENERGY INC | COM | 25278X109 | — | 212,709 shares | $37,390,041 |
| SITIME CORP | COM | 82982T106 | — | 49,998 shares | $37,276,509 |
| APPLIED OPTOELECTRONICS INC | COM | 03823U102 | — | 249,553 shares | $36,973,772 |
| KRYSTAL BIOTECH INC | COM | 501147102 | — | 98,707 shares | $36,686,431 |
| EVERUS CONSTR GROUP | COM | 300426103 | — | 221,067 shares | $36,686,069 |
| SPX TECHNOLOGIES INC | COM | 78473E103 | — | 147,481 shares | $36,157,917 |
| AXSOME THERAPEUTICS INC. | COM | 05464T104 | — | 145,145 shares | $35,527,142 |
| SILICON MOTION TECHNOLOGY CO | SPONSORED ADR | 82706C108 | — | 106,466 shares | $35,488,312 |
| CORPAY INC | COM SHS | 219948106 | — | 103,975 shares | $34,651,748 |
| IRHYTHM HOLDINGS INC | COM | 450056106 | — | 288,924 shares | $34,367,510 |
| TERAWULF INC | COM | 88080T104 | — | 1,336,673 shares | $33,015,823 |
| KAISER ALUMINIUM CORPORATION | COM PAR $0.01 | 483007704 | — | 163,465 shares | $31,978,658 |
| D-WAVE QUANTUM INC | COM | 26740W109 | — | 1,313,161 shares | $31,502,732 |
| DIANTHUS THERAPEUTICS INC | COM | 252828108 | — | 314,914 shares | $30,697,817 |
| KODIAK GAS SVCS INC | COM | 50012A108 | — | 402,126 shares | $30,211,726 |