Westfield Capital Management Co Lp
Institutional manager — quarterly 13F holdings, Q ending 2026-03-31
Reported value
$23.83B
Q ending 2026-03-31
Prior quarter
$24.01B
Q ending 2025-12-31
Change
-0.7% QoQ · +16.0% YoY
Positions
250
reported holdings
Largest positions
Top 100 of 250 reported positions by value, Q ending 2026-03-31. A manager can hold shares, calls and puts on the same security at once — such positions are listed as separate rows. Type: Shares = common stock, Put/Call = option positions (valued at the underlying), Principal = debt. Tickers link to stock pages where covered.
| Holding | Ticker | Type | Value ▼ | Shares |
|---|---|---|---|---|
| Nvidia Corporation | NVDA | Shares | $1.10B | 6.3M |
| Ascendis Pharma A/S | Shares | $1.10B | 4.8M | |
| Comfort Sys Usa Inc | FIX | Shares | $856.2M | 621K |
| Apple Inc | AAPL | Shares | $795.2M | 3.1M |
| Ftai Aviation Ltd | Shares | $697.8M | 2.8M | |
| Microsoft Corp | MSFT | Shares | $610.6M | 1.6M |
| Alphabet Inc | GOOGL | Shares | $582.8M | 2.0M |
| Howmet Aerospace Inc | HWM | Shares | $527.7M | 2.3M |
| Vertiv Holdings Co | VRT | Shares | $481.5M | 1.9M |
| Amazon Com Inc | AMZN | Shares | $474.8M | 2.3M |
| Axon Enterprise Inc | AXON | Shares | $451.9M | 1.1M |
| Broadcom Inc | AVGO | Shares | $382.8M | 1.2M |
| Eli Lilly & Co | LLY | Shares | $335.3M | 365K |
| Tapestry Inc | TPR | Shares | $310.3M | 2.2M |
| Meta Platforms Inc | META | Shares | $301.4M | 527K |
| Lpl Finl Hldgs Inc | LPLA | Shares | $265.2M | 882K |
| Mks Inc. | MKSI | Shares | $240.6M | 1.0M |
| Insmed Inc | INSM | Shares | $240.1M | 1.5M |
| Vaxcyte Inc | PCVX | Shares | $211.9M | 3.6M |
| Rocket Lab Corp | RKLB | Shares | $203.7M | 3.2M |
| Netflix Inc. | NFLX | Shares | $189.4M | 2.0M |
| Api Group Corp | APG | Shares | $187.8M | 4.6M |
| Quanta Svcs Inc | PWR | Shares | $182.2M | 332K |
| Ge Vernova Inc | GEV | Shares | $174.0M | 199K |
| Ares Management Corporation | ARES | Shares | $171.6M | 1.6M |
| Rhythm Pharmaceuticals Inc | RYTM | Shares | $167.8M | 1.9M |
| Taiwan Semiconductor Manufac | TSM | Shares | $166.8M | 494K |
| Marvell Technology Inc | MRVL | Shares | $165.7M | 1.7M |
| Bloom Energy Corp | BE | Shares | $161.4M | 1.2M |
| Samsara Inc | IOT | Shares | $160.8M | 5.1M |
| Ametek Inc | AME | Shares | $159.9M | 746K |
| Permian Resources Corp | PR | Shares | $159.5M | 7.5M |
| Dynatrace Inc | DT | Shares | $155.7M | 4.2M |
| Revolution Medicines Inc | RVMD | Shares | $151.4M | 1.6M |
| Natera Inc | NTRA | Shares | $150.9M | 755K |
| Fabrinet | Shares | $148.6M | 285K | |
| Abivax Sa | ABVX | Shares | $147.3M | 1.3M |
| Servicenow Inc | NOW | Shares | $145.8M | 1.4M |
| Technipfmc Plc | Shares | $140.6M | 2.0M | |
| Royal Caribbean Group | Shares | $139.2M | 506K | |
| Hilton Worldwide Hldgs Inc | HLT | Shares | $139.1M | 457K |
| Visa Inc | V | Shares | $138.0M | 457K |
| Cencora Inc | COR | Shares | $137.3M | 437K |
| Itt Inc | ITT | Shares | $134.0M | 703K |
| Celsius Hldgs Inc | CELH | Shares | $133.7M | 3.8M |
| Nextpower Inc | NXT | Shares | $133.5M | 1.1M |
| Cheniere Energy Inc | LNG | Shares | $130.3M | 459K |
| Amer Sports Inc | Shares | $129.6M | 3.9M | |
| Regal Rexnord Corporation | RRX | Shares | $127.7M | 682K |
| Msci Inc | MSCI | Shares | $126.0M | 234K |
| Guardant Health Inc | GH | Shares | $125.9M | 1.4M |
| Live Nation Entertainment In | LYV | Shares | $123.6M | 811K |
| Tesla Inc | TSLA | Shares | $117.5M | 316K |
| Globe Life Inc | GL | Shares | $117.2M | 842K |
| Dutch Bros Inc | BROS | Shares | $117.2M | 2.3M |
| Cloudflare Inc | NET | Shares | $111.7M | 542K |
| Roku Inc | ROKU | Shares | $111.5M | 1.2M |
| Xpo Inc | XPO | Shares | $111.3M | 572K |
| Fifth Third Bancorp | FITB | Shares | $110.8M | 2.4M |
| Everpure Inc | P | Shares | $110.7M | 1.9M |
| Kratos Defense & Sec Solutio | KTOS | Shares | $110.2M | 1.6M |
| American Intl Group Inc | AIG | Shares | $109.8M | 1.5M |
| Snowflake Inc | SNOW | Shares | $108.4M | 719K |
| Primoris Svcs Corp | PRIM | Shares | $106.3M | 743K |
| Jones Lang Lasalle Inc | JLL | Shares | $105.8M | 348K |
| Legence Corp | LGN | Shares | $105.1M | 1.9M |
| Legend Biotech Corp | LEGN | Shares | $104.3M | 5.8M |
| Keycorp | KEY | Shares | $104.1M | 5.2M |
| Ross Stores Inc | ROST | Shares | $102.2M | 472K |
| Palomar Hldgs Inc | PLMR | Shares | $102.1M | 854K |
| Palo Alto Networks Inc | PANW | Shares | $102.0M | 636K |
| Diamondback Energy Inc | FANG | Shares | $99.6M | 503K |
| Palantir Technologies Inc | PLTR | Shares | $98.7M | 675K |
| Semtech Corp | SMTC | Shares | $98.5M | 1.3M |
| Woodward Inc | WWD | Shares | $97.4M | 272K |
| Arista Networks Inc | ANET | Shares | $95.8M | 780K |
| Autozone Inc | AZO | Shares | $95.8M | 28K |
| Sharkninja Inc | Shares | $95.8M | 905K | |
| Coherent Corp | COHR | Shares | $94.5M | 397K |
| Astera Labs Inc | ALAB | Shares | $94.3M | 860K |
| Braze Inc | BRZE | Shares | $93.8M | 4.0M |
| Jabil Inc | JBL | Shares | $92.8M | 349K |
| Lincoln Elec Hldgs Inc | LECO | Shares | $89.2M | 358K |
| Imax Corp | IMAX | Shares | $88.9M | 2.3M |
| Genedx Holdings Corp | WGS | Shares | $87.9M | 1.4M |
| Garmin Ltd | Shares | $87.3M | 376K | |
| Credo Technology Group Holdi | Shares | $86.9M | 926K | |
| F5 Inc | FFIV | Shares | $86.4M | 299K |
| East West Bancorp Inc | EWBC | Shares | $86.0M | 806K |
| Life Time Group Holdings Inc | LTH | Shares | $85.8M | 3.2M |
| Birkenstock Holding Plc | Shares | $83.8M | 2.3M | |
| Oreilly Automotive Inc | ORLY | Shares | $82.0M | 888K |
| Morgan Stanley | MS | Shares | $81.7M | 497K |
| Xenon Pharmaceuticals Inc | XENE | Shares | $81.5M | 1.4M |
| Alnylam Pharmaceuticals Inc | ALNY | Shares | $81.2M | 246K |
| Firstcash Holdings Inc | FCFS | Shares | $81.2M | 432K |
| Idex Corp | IEX | Shares | $80.8M | 426K |
| Mastec Inc | MTZ | Shares | $80.4M | 250K |
| Houlihan Lokey Inc | HLI | Shares | $78.1M | 544K |
| Plexus Corp | PLXS | Shares | $77.9M | 384K |
Values as reported in public regulatory filings (USD); holdings are reported quarterly, up to 45 days after quarter end, and may contain reporting errors. Nothing here is investment advice.