13F Filings History of WESTFIELD CAPITAL MANAGEMENT CO LP
- Latest 13F filing
- Q1 2026 - 11 May 2026
- Latest reported 13F value
- $23,834,799,485
- Largest 13F holdings
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NVDA ASND FIX AAPL FTAI MSFT GOOGL HWM VRT AMZN AXON AVGO
+8 more
LLY TPR META LPLA MKSI INSM PCVX RKLB - Form 13F summary
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- WESTFIELD CAPITAL MANAGEMENT CO LP Form 13F history summarizes parsed U.S.-listed equity disclosures for this manager.
- Form 13F is generally due within 45 days after each calendar quarter ends.
- WESTFIELD CAPITAL MANAGEMENT CO LP reported 250 equity holdings with a total reported market value of $23,834,799,485 for Q1 2026. Top reported holdings included NVDA, ASND, FIX, AAPL, and FTAI.
- Manager signature
- Brandi McMahon - Vice President, Deputy Chief Compliance Officer
- Manager location
- Boston, MA
13F snapshot
Latest parsed holdings, value, and filing-period context.
1 signal
Manager
Names, identifiers, and filing context for this profile.
2 identity fields
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Holdings Value
Form 13F evidence
Quarterly portfolio filings
SEC-reported 13F quarters for this filer, ordered by the latest accepted filing.
Latest quarter
Q1 2026
Latest value
$23,834,799,485
Quarter delta
-$170,212,257
Accepted
11 May 2026, 16:01
Rows shown
1-25 of 50
| Quarter | Holdings | SEC-reported value | Bought | Sold | Net | Top Holdings | Form Type | Accepted by SEC |
|---|---|---|---|---|---|---|---|---|
| Q1 2026 | 250 | $23,834,799,485 | +$4,429,689,901 | -$4,255,474,655 | +$174,215,246 | NVDA, ASND, FIX, AAPL, FTAI | 13F-HR | 11 May 2026, 16:01 |
| Q4 2025 | 241 | $24,005,011,742 | +$3,750,801,374 | -$3,679,483,495 | +$71,317,879 | NVDA, ASND, AAPL, MSFT, GOOGL | 13F-HR | 10 Feb 2026, 19:41 |
| Q3 2025 | 235 | $23,832,915,424 | +$3,486,141,115 | -$5,020,265,406 | -$1,534,124,291 | NVDA, ASND, MSFT, AAPL, FIX | 13F-HR | 10 Nov 2025, 21:49 |
| Q2 2025 | 239 | $23,843,766,396 | +$3,693,685,211 | -$3,733,086,545 | -$39,401,334 | NVDA, ASND, MSFT, AAPL, AMZN | 13F-HR | 11 Aug 2025, 18:43 |
| Q1 2025 | 244 | $20,549,795,430 | +$2,898,409,195 | -$3,273,072,412 | -$374,663,217 | ASND, NVDA, AAPL, MSFT, AMZN | 13F-HR | 09 May 2025, 10:27 |
| Q4 2024 | 239 | $22,971,696,460 | +$3,658,268,087 | -$3,807,933,269 | -$149,665,182 | NVDA, AAPL, MSFT, ASND, AMZN | 13F-HR | 11 Feb 2025, 12:08 |
| Q3 2024 | 247 | $22,133,837,079 | +$3,770,850,152 | -$3,131,397,059 | +$639,453,093 | NVDA, AAPL, MSFT, ASND, AMZN | 13F-HR | 12 Nov 2024, 17:12 |
| Q2 2024 | 248 | $20,353,525,988 | +$4,936,647,565 | -$2,463,329,738 | +$2,473,317,827 | NVDA, MSFT, AAPL, ASND, AMZN | 13F-HR | 14 Aug 2024, 11:10 |
| Q1 2024 | 244 | $19,047,708,538 | +$2,391,813,557 | -$2,425,850,524 | -$34,036,967 | MSFT, ASND, AAPL, NVDA, AMZN | 13F-HR | 10 May 2024, 16:01 |
| Q4 2023 | 239 | $17,157,520,118 | +$2,498,485,981 | -$1,990,082,468 | +$508,403,513 | MSFT, ASND, AAPL, GOOGL, AMZN | 13F-HR | 09 Feb 2024, 16:01 |
| Q3 2023 | 234 | $14,680,795,887 | +$1,816,690,597 | -$2,132,519,268 | -$315,828,671 | AAPL, GOOGL, MSFT, ASND, AMZN | 13F-HR | 13 Nov 2023, 16:01 |
| Q2 2023 | 227 | $15,739,052,389 | +$2,842,710,882 | -$2,368,124,240 | +$474,586,642 | AAPL, MSFT, GOOGL, ICLR, TDG | 13F-HR | 11 Aug 2023, 16:54 |
| Q1 2023 | 222 | $14,150,980,920 | +$2,071,919,739 | -$2,268,132,224 | -$196,212,485 | AAPL, MSFT, ASND, GOOGL, ICLR | 13F-HR | 12 May 2023, 17:22 |
| Q4 2022 | 226 | $12,964,837,362 | +$1,753,197,010 | -$1,933,949,333 | -$180,752,323 | AAPL, ASND, MSFT, GOOGL, ICLR | 13F-HR | 13 Feb 2023, 16:19 |
| Q3 2022 | 230 | $12,540,062,000 | +$1,996,890,901 | -$1,370,521,183 | +$626,369,718 | AAPL, MSFT, GOOGL, ASND, ICLR | 13F-HR | 14 Nov 2022, 09:05 |
| Q2 2022 | 235 | $12,700,476,000 | +$2,111,386,185 | -$1,354,413,334 | +$756,972,851 | AAPL, GOOGL, MSFT, ICLR, ASND | 13F-HR | 12 Aug 2022, 17:16 |
| Q1 2022 | 235 | $15,601,903,000 | +$2,386,894,418 | -$2,176,533,058 | +$210,361,360 | AAPL, GOOGL, MSFT, AMZN, ICLR | 13F-HR | 16 May 2022, 11:30 |
| Q4 2021 | 244 | $16,825,241,000 | +$2,166,557,630 | -$2,913,773,074 | -$747,215,444 | AAPL, MSFT, GOOGL, AMZN, ICLR | 13F-HR | 10 Feb 2022, 16:00 |
| Q3 2021 | 235 | $16,580,184,000 | +$1,822,347,333 | -$2,018,582,594 | -$196,235,261 | AAPL, GOOGL, MSFT, AMZN, ICLR | 13F-HR | 12 Nov 2021, 10:02 |
| Q2 2021 | 241 | $16,697,140,000 | +$2,273,465,124 | -$2,897,205,528 | -$623,740,404 | AAPL, AMZN, GOOGL, MSFT, META | 13F-HR | 10 Aug 2021, 17:26 |
| Q1 2021 | 243 | $16,089,955,000 | +$2,769,001,842 | -$3,977,947,337 | -$1,208,945,495 | AAPL, AMZN, GOOGL, MSFT, META | 13F-HR | 14 May 2021, 10:42 |
| Q4 2020 | 247 | $16,852,328,000 | +$2,147,904,907 | -$2,987,108,987 | -$839,204,080 | AAPL, AMZN, MSFT, GOOGL, ZEN | 13F-HR | 12 Feb 2021, 07:35 |
| Q3 2020 | 235 | $15,448,316,000 | +$2,499,856,500 | -$2,536,780,598 | -$36,924,098 | AAPL, AMZN, MSFT, GOOGL, META | 13F-HR | 13 Nov 2020, 11:54 |
| Q2 2020 | 230 | $14,541,816,000 | +$2,003,741,236 | -$2,000,796,852 | +$2,944,384 | AMZN, AAPL, MSFT, GOOGL, NOW | 13F-HR | 13 Aug 2020, 09:29 |
| Q1 2020 | 216 | $11,354,045,000 | +$2,178,528,563 | -$2,822,562,779 | -$644,034,216 | AAPL, MSFT, AMZN, GOOGL, NOW | 13F-HR | 14 May 2020, 10:01 |