WESTFIELD CAPITAL MANAGEMENT CO LP
•CIK: 1177719•Filing: Q4 2025
Westfield Capital Management Co. LP, with $24.0B in AUM, is known for its concentrated, high-conviction bets, exemplified by recent significant additions like ABBV (+5125%) and FFIV (+1270%). Led by the seasoned duo of John A. Westfield and John A. Westfield Jr., the fund maintains a tech-heavy portfolio with top holdings in NVDA, ASND, and AAPL, while recently entering positions in ABVX, APG, and BROS.
Total AUM
$24.0B
QoQ Performance
+0.7%
Positions
238
Top 10 Concentration
29.8%
Latest Filing
Q4 2025
Top Holdings Allocation
NVDA4.6%
ASND4.6%
AAPL3.7%
MSFT3.3%
GOOGL2.8%
FIX2.6%
AMZN2.2%
AXON2.0%
📈 Biggest Buys
📉 Biggest Sells
Sector Breakdown
Other71.5%
Technology18.8%
Consumer4.1%
Financial2.5%
Healthcare2.3%
Communication0.6%
Consumer Staples0.0%
Utilities0.0%
🚪 Exited Positionssold since Q3 2025
+54 more exited positions
Changes from Q3 2025
NEW24 new positions
↑113 increased
↓59 decreased
Historical Filings
Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023