WESTFIELD CAPITAL MANAGEMENT CO LP

Q1 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
3/31/2026
Date filed
5/11/2026
Form type
13F-HR
Num holdings
250
Total value ($000)
$23,834,799
Net value change ($000)
-170,213 (-0.7%)
New positions
46
Sold out positions
37
Turnover %
15.1%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/11/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
FTAI 235,095 50.8%
FIX 232,018 37.2%
INSM 164,846 219.0%
LNG 130,258 NEW
AS 129,623 NEW
VRT 112,525 30.5%
AIG 109,768 NEW
MKSI 106,361 79.3%
JLL 105,836 NEW
ROST 102,231 NEW
Top Reduces (Value $000, Stocks/ETFs)
MSFT -173,454 -22.1%
BAC -158,288 -75.3%
MASI -137,264 -69.3%
CVLT -132,515 -100.0%
TEAM -131,692 -100.0%
META -131,136 -30.3%
ADMA -127,551 -100.0%
HQY -119,291 -66.7%
PODD -109,497 -99.7%
HEI -99,763 -95.9%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type