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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) |
|---|---|---|---|---|---|
| NVIDIA CORPORATION | COM | 67066G104 | — | 8,079,926 shares | $1,616,712,338 |
| ALPHABET INC | CAP STK CL A | 02079K305 | — | 3,749,074 shares | $1,339,806,415 |
| ASCENDIS PHARMA A/S | ORD SHS | K08588103 | — | 4,798,267 shares | $1,279,793,795 |
| AXON ENTERPRISE INC | COM | 05464C101 | — | 1,491,490 shares | $836,144,444 |
| FTAI AVIATION LTD | SHS | G3730V105 | — | 2,937,228 shares | $794,608,199 |
| APPLE INC | COM | 037833100 | — | 2,573,774 shares | $744,747,287 |
| COMFORT SYS USA INC | COM | 199908104 | — | 355,433 shares | $704,451,409 |
| BROADCOM INC | COM | 11135F101 | — | 1,556,522 shares | $587,976,343 |
| MICROSOFT CORP | COM | 594918104 | — | 1,414,294 shares | $527,559,770 |
| HOWMET AEROSPACE INC | COM | 443201108 | — | 1,921,476 shares | $516,608,027 |
| ELI LILLY & CO | COM | 532457108 | — | 416,732 shares | $499,840,862 |
| SNOWFLAKE INC | COM SHS | 833445109 | — | 1,736,498 shares | $441,938,647 |
| MKS INC. | COM | 55306N104 | — | 928,617 shares | $413,048,645 |
| META PLATFORMS INC | CL A | 30303M102 | — | 677,389 shares | $381,566,445 |
| VERTIV HOLDINGS CO | COM CL A | 92537N108 | — | 1,054,361 shares | $353,021,161 |
| GE VERNOVA INC | COM | 36828A101 | — | 241,272 shares | $283,461,275 |
| MICRON TECHNOLOGY INC | COM | 595112103 | — | 228,203 shares | $263,412,188 |
| VISA INC | COM CL A | 92826C839 | — | 762,403 shares | $261,572,839 |
| API GROUP CORP | COM STK | 00187Y100 | — | 6,154,301 shares | $260,634,647 |
| TAPESTRY INC | COM | 876030107 | — | 1,696,569 shares | $248,343,835 |
| RHYTHM PHARMACEUTICALS INC | COM | 76243J105 | — | 2,208,595 shares | $245,220,303 |
| LIFE TIME GROUP HOLDINGS INC | COMMON STOCK | 53190C102 | — | 5,995,254 shares | $244,846,173 |
| TAIWAN SEMICONDUCTOR MANUFAC | SPONSORED ADS | 874039100 | — | 510,999 shares | $244,037,920 |
| GUARDANT HEALTH INC | COM | 40131M109 | — | 1,624,459 shares | $243,717,584 |
| QUANTA SVCS INC | COM | 74762E102 | — | 331,489 shares | $238,685,542 |
| SERVICENOW INC | COM | 81762P102 | — | 2,373,711 shares | $235,661,989 |
| ADVANCED MICRO DEVICES INC | COM | 007903107 | — | 403,081 shares | $234,153,542 |
| PALO ALTO NETWORKS INC | COM | 697435105 | — | 658,331 shares | $224,504,060 |
| WOODWARD INC | COM | 980745103 | — | 526,505 shares | $223,996,287 |
| ARISTA NETWORKS INC | COM SHS | 040413205 | — | 1,317,096 shares | $223,748,310 |
| LPL FINL HLDGS INC | COM | 50212V100 | — | 793,061 shares | $223,389,290 |
| ROCKET LAB CORP | COM | 773121108 | — | 2,114,005 shares | $214,888,621 |
| AMER SPORTS INC | COM SHS | G0260P102 | — | 6,344,923 shares | $214,712,179 |
| CLOUDFLARE INC | CL A COM | 18915M107 | — | 835,502 shares | $204,931,901 |
| AMAZON COM INC | COM | 023135106 | — | 859,806 shares | $204,926,241 |
| GARMIN LTD | SHS | H2906T109 | — | 861,057 shares | $204,535,458 |
| REGAL REXNORD CORPORATION | COM | 758750103 | — | 856,976 shares | $204,123,113 |
| NATERA INC | COM | 632307104 | — | 726,628 shares | $197,243,187 |
| MORGAN STANLEY | COM NEW | 617446448 | — | 940,560 shares | $196,614,709 |
| CARPENTER TECHNOLOGY CORP | COM | 144285103 | — | 314,082 shares | $193,738,341 |
| SAMSARA INC | COM CL A | 79589L106 | — | 5,836,459 shares | $189,276,373 |
| DYNATRACE INC | COM NEW | 268150109 | — | 4,249,229 shares | $186,583,645 |
| CATERPILLAR INC | COM | 149123101 | — | 174,620 shares | $185,952,922 |
| SEMTECH CORP | COM | 816850101 | — | 1,133,268 shares | $183,419,455 |
| AMETEK INC | COM | 031100100 | — | 723,798 shares | $175,115,699 |
| ABIVAX SA | SPONSORED ADS | 00370M103 | — | 1,309,825 shares | $174,547,280 |
| INSMED INC | COM PAR $.01 | 457669307 | — | 1,629,561 shares | $173,743,795 |
| ITT INC | COM | 45073V108 | — | 830,382 shares | $164,216,344 |
| GILEAD SCIENCES INC | COM | 375558103 | — | 1,287,629 shares | $162,679,071 |
| PTC THERAPEUTICS INC | COM | 69366J200 | — | 1,956,156 shares | $159,563,645 |
| DUTCH BROS INC | CL A | 26701L100 | — | 2,184,001 shares | $156,833,112 |
| CELSIUS HLDGS INC | COM NEW | 15118V207 | — | 5,324,481 shares | $155,900,804 |
| MASTEC INC | COM | 576323109 | — | 374,457 shares | $155,796,579 |
| SHARKNINJA INC | COM SHS | G8068L108 | — | 1,008,349 shares | $153,541,302 |
| CSX CORP | COM | 126408103 | — | 3,154,419 shares | $149,929,537 |
| FIRSTCASH HOLDINGS INC | COM | 33768G107 | — | 693,085 shares | $149,928,147 |
| KEYCORP | COM | 493267108 | — | 6,493,467 shares | $149,674,414 |
| MICROCHIP TECHNOLOGY INC. | COM | 595017104 | — | 1,639,111 shares | $149,486,918 |
| APPLIED MATLS INC | COM | 038222105 | — | 205,592 shares | $148,642,862 |
| MARRIOTT INTL INC NEW | CL A | 571903202 | — | 398,962 shares | $147,851,416 |
| VAXCYTE INC | COM | 92243G108 | — | 2,472,428 shares | $143,722,240 |
| GLOBE LIFE INC | COM | 37959E102 | — | 770,990 shares | $137,760,493 |
| TECHNIPFMC PLC | COM | G87110105 | — | 2,059,689 shares | $136,557,381 |
| XPO INC | COM | 983793100 | — | 629,011 shares | $129,129,668 |
| LEGEND BIOTECH CORP | SPONSORED ADS | 52490G102 | — | 4,430,063 shares | $127,940,224 |
| EVERPURE INC | CL A | 74624M102 | — | 1,611,958 shares | $127,006,190 |
| LAM RESEARCH CORP | COM NEW | 512807306 | — | 285,614 shares | $123,765,288 |
| JONES LANG LASALLE INC | COM | 48020Q107 | — | 398,453 shares | $123,500,507 |
| ASTERA LABS INC | COM | 04626A103 | — | 249,299 shares | $120,416,534 |
| ROCKWELL AUTOMATION INC | COM | 773903109 | — | 237,136 shares | $117,401,415 |
| IDEX CORP | COM | 45167R104 | — | 513,564 shares | $116,553,350 |
| COHERENT CORP | COM | 19247G107 | — | 291,040 shares | $114,806,662 |
| LEGENCE CORP | CL A | 52476L109 | — | 1,341,963 shares | $114,375,506 |
| LINCOLN ELEC HLDGS INC | COM | 533900106 | — | 430,681 shares | $114,350,112 |
| ASML HLDG NV | N Y REGISTRY SHS | N07059210 | — | 57,430 shares | $114,253,539 |
| PLANET LABS PBC | COM CL A | 72703X106 | — | 3,428,007 shares | $113,569,872 |
| ONTO INNOVATION INC | COM | 683344105 | — | 299,383 shares | $113,301,496 |
| CENCORA INC | COM | 03073E105 | — | 400,058 shares | $113,208,499 |
| REVOLUTION MEDICINES INC | COM | 76155X100 | — | 600,821 shares | $112,521,763 |
| SANDISK CORP | COM | 80004C200 | — | 49,024 shares | $111,466,432 |
| AFFIRM HLDGS INC | COM CL A | 00827B106 | — | 1,352,200 shares | $110,271,910 |
| LIVE NATION ENTERTAINMENT IN | COM | 538034109 | — | 590,764 shares | $108,174,743 |
| ENPRO INC | COM | 29355X107 | — | 286,554 shares | $108,010,799 |
| PERMIAN RESOURCES CORP | CLASS A COM | 71424F105 | — | 5,756,888 shares | $105,984,308 |
| ARES MANAGEMENT CORPORATION | CL A COM STK | 03990B101 | — | 952,032 shares | $105,970,698 |
| IMAX CORP | COM | 45245E109 | — | 2,654,014 shares | $105,788,998 |
| GUIDEWIRE SOFTWARE INC | COM | 40171V100 | — | 839,337 shares | $103,280,418 |
| NEXTPOWER INC | CLASS A COM | 65290E101 | — | 857,399 shares | $102,150,517 |
| JFROG LTD | ORD SHS | M6191J100 | — | 1,114,561 shares | $101,291,304 |
| SYNOPSYS INC | COM | 871607107 | — | 226,856 shares | $101,193,710 |
| ROKU INC | COM CL A | 77543R102 | — | 716,557 shares | $98,985,184 |
| PLEXUS CORP | COM | 729132100 | — | 321,808 shares | $96,758,011 |
| APPLIED INDL TECHNOLOGIES IN | COM | 03820C105 | — | 285,691 shares | $96,606,412 |
| MSCI INC | COM | 55354G100 | — | 171,958 shares | $96,303,610 |
| ROBINHOOD MKTS INC | COM CL A | 770700102 | — | 955,544 shares | $95,821,962 |
| ROSS STORES INC | COM | 778296103 | — | 442,420 shares | $94,169,075 |
| ADAPTIVE BIOTECHNOLOGIES COR | COM | 00650F109 | — | 4,267,645 shares | $91,540,985 |
| XENON PHARMACEUTICALS INC | COM | 98420N105 | — | 1,507,294 shares | $90,980,266 |
| OREILLY AUTOMOTIVE INC | COM | 67103H107 | — | 933,255 shares | $85,943,469 |
| CITIGROUP INC | COM NEW | 172967424 | — | 608,124 shares | $85,112,990 |