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Westfield Capital Management Co. LP
Westfield Capital Management Company LP is a Boston-based investment management firm focused on growth equity investing. Founded in 1989, the firm serves institutional investors, including corporations, public and corporate pension plans, endowments, foundations, and high-net-worth individuals. It specializes in actively managed equities with a mid and large-cap focus and employs more than 50 professionals.
Investment Strategy
Westfield Capital Management employs a fundamental, bottom-up research approach focused on growth-oriented equity investing. The firm seeks to identify high-quality companies with above-average growth prospects, strong management teams, and sustainable competitive advantages. Portfolios are typically concentrated and constructed with a long-term investment horizon, focusing on U.S. mid- and large-cap stocks across various growth styles.
Latest 13F Filing Activity
Westfield Capital Management Co. LP filed their most recent 13F report on Jun 30, 2025 disclosing 237 equity positions with a total 13F market value of $24B. The fund increased holdings in Nvidia Corporation, Comfort SYS USA Inc., Howmet Aerospace Inc. among other positions. Westfield Capital Management Co. LP reduced exposure to Palantir Technologies Inc., Dicks Sporting Goods Inc., Atlassian Corporation among others.
Top Holdings
Equity Positions (237)
| Ticker | Security | Weight | Market Value | Shares | Avg Cost | Price | Change (QoQ) |
|---|---|---|---|---|---|---|---|
N NVDA | NVIDIA CORPORATION | 5.00% | $1.19B | 7,545,345 | $46.54 | $157.99 | +$396.9M |
A ASND | ASCENDIS PHARMA A/S | 3.95% | $940.9M | 5,451,401 | $119.97 | $172.60 | +$86.9M |
M MSFT | MICROSOFT CORP | 3.67% | $874.2M | 1,757,424 | $196.35 | $497.41 | +$186.2M |
A AAPL | APPLE INC | 3.01% | $716.9M | 3,494,184 | $84.79 | $205.17 | -$38.6M |
A AMZN | AMAZON COM INC | 2.85% | $680.2M | 3,100,452 | $103.90 | $219.39 | +$21.4M |
Industry Allocation
Investment Team (29)
| Name | Role | Location | |
|---|---|---|---|
A Amanda Schoewe | Research Analyst | Denver, CO , United States | |
D Dee Silveira-Baptista | partner | Boston, MA , United States | |
E Edward Richardson | Senior Equity Analyst | Boston, MA , United States | |
E Ethan Meyers | Partner | Boston, MA , United States | |
J John Montgomery | Managing Director and COO | Boston, MA , United States | |
J Joseph Kearney | Senior Security Analyst | Cambridge, MA , United States | |
 | Partner | Boston, MA , United States | |
 | Partner and CFO and CCO | Needham, MA , United States | |
K Kevin Shin | Analyst | Boston, MA , United States | |
 | Partner | Boston, MA , United States |
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