13F Filings History of WESTFIELD CAPITAL MANAGEMENT CO LP

13F snapshot Latest parsed holdings, value, and filing-period context. 1 signal
Form 13F summary
  • 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 Names, identifiers, and filing context for this profile. 2 identity fields
Manager signature
Brandi McMahon - Vice President, Deputy Chief Compliance Officer
Manager location
Boston, MA

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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
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