WESTFIELD CAPITAL MANAGEMENT CO LP

CIK 0001177719 · BOSTON, MA · Quarter end: 2026-06-30 · Filed on: 2026-08-12 · Open the SEC source

WESTFIELD CAPITAL MANAGEMENT CO LP reported 278 positions worth $30.61B as of June 30, 2026 (13F filed August 12, 2026). Largest holding: NVDA (5.3%).

Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$30.61B
2026 Q2
Positions
278
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
29.2%
Est. Net Flow (Q)
2026 Q2
10 / 278 positions shown
#SymbolCompanyTypeValue% Port.Shares1YYTD
1NVDANVIDIA CORPORATIONSH$1.62B5.28%8,079,926
2GOOGLALPHABET INCSH$1.34B4.38%3,749,074
3ASNDASCENDIS PHARMA A/SSH$1.28B4.18%4,798,267
4AXONAXON ENTERPRISE INCSH$836.1M2.73%1,491,490
5FTAIFTAI AVIATION LTDSH$794.6M2.60%2,937,228
6AAPLAPPLE INCSH$744.7M2.43%2,573,774
7FIXCOMFORT SYS USA INCSH$704.5M2.30%355,433
8AVGOBROADCOM INCSH$588.0M1.92%1,556,522
9MSFTMICROSOFT CORPSH$527.6M1.72%1,414,294
10HWMHOWMET AEROSPACE INCSH$516.6M1.69%1,921,476

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Read the 2026-Q2 quarterly report · 13F Filing Calendar

Frequently Asked Questions

What stocks does WESTFIELD CAPITAL MANAGEMENT CO LP hold as of Q2 2026?

WESTFIELD CAPITAL MANAGEMENT CO LP reported 278 positions worth $30.61B in its Q2 2026 13F filing. Largest positions: NVDA (5.3%), GOOGL (4.4%), ASND (4.2%), AXON (2.7%) and FTAI (2.6%).

What did WESTFIELD CAPITAL MANAGEMENT CO LP buy in Q2 2026?

No previous quarter is available yet; the comparison appears with the next filing.

What did WESTFIELD CAPITAL MANAGEMENT CO LP sell in Q2 2026?

No previous quarter is available yet.

13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.