WESTFIELD CAPITAL MANAGEMENT CO LP

Q3 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
9/30/2026
Date filed
11/12/2026
Form type
13F-HR
Num holdings
281
Total value ($000)
$30,564,680
Net value change ($000)
-49,847 (-0.2%)
New positions
44
Sold out positions
41
Turnover %
14.1%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/12/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q2 2026
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)
PLTR 246,944 NEW
NVDA 230,537 14.3%
EAT 229,715 NEW
META 221,745 58.1%
RBRK 197,869 263.0%
USFD 196,173 NEW
CLS 152,110 NEW
MSFT 151,291 28.7%
MU 147,570 56.0%
SNOW 147,199 33.3%
Top Reduces (Value $000, Stocks/ETFs)
FTAI -794,608 -100.0%
FIX -603,755 -85.7%
VRT -353,021 -100.0%
RKLB -168,936 -78.6%
BROS -155,700 -99.3%
AXON -155,275 -18.6%
GILD -154,444 -94.9%
MAR -147,851 -100.0%
MKSI -139,841 -33.9%
LGN -114,376 -100.0%
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