WESTFIELD CAPITAL MANAGEMENT CO LP

Q2 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
6/30/2026
Date filed
8/12/2026
Form type
13F-HR
Num holdings
278
Total value ($000)
$30,614,527
Net value change ($000)
+6,779,728 (28.4%)
New positions
69
Sold out positions
41
Turnover %
21.8%
Sector allocation + QoQ delta (equities-only)
Prev filing: 5/11/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q1 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)
Ascendis Pharma AS 1,279,794 NEW
GOOGL 756,995 129.9%
NVDA 515,020 46.7%
AXON 384,217 85.0%
SNOW 333,528 307.7%
AMD 233,133 22833.8%
MU 229,481 676.3%
AVGO 205,135 53.6%
CRS 193,738 NEW
MKSI 172,492 71.7%
Top Reduces (Value $000, Stocks/ETFs)
ASND -1,100,978 -100.0%
AMZN -269,858 -56.8%
NFLX -168,650 -89.0%
MRVL -161,818 -97.6%
BE -158,246 -98.0%
FIX -151,784 -17.7%
VRT -128,517 -26.7%
KTOS -110,217 -100.0%
AIG -109,768 -100.0%
PLTR -98,674 -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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Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type