Stocks/Funds/CIK 1106832

CASTLEARK MANAGEMENT LLC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1106832
Assets
$2.95B
+5.1% YoY
Holdings
290
Lifetime alpha vs market
+23.43% annual
Average hold time
4.1 yr
median 2.5 yr

Quarterly history

Cum return +304% vs S&P +49% · α +255% lifetimeAUM $3.0B · peak $3.5BFlow $-303M (-9%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-19.33%
trims when stocks drop
when a holding falls −10%+
Middle response
-11.56%
baseline attrition
Rally response
+0.46%
adds into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
NVDANVIDIA Corporation$219M7.4%+60.9%6.3 yr
GOOGLAlphabet Inc.$120M4.1%10.5 yr
MSFTMicrosoft Corporation$98M3.3%-0.6%10.5 yr
SPIBState Street SPDR Portfo$90M3.1%1.5 yr
AAPLApple Inc.$89M3.0%+14.7%10.5 yr
GOVTiShares U.S. Treasury Bo$76M2.6%1.5 yr
LRCXLam Research Corporation$72M2.4%+196.1%1.5 yr
METAMeta Platforms, Inc.$71M2.4%-0.4%10.5 yr
LLYEli Lilly and Company$68M2.3%+12.2%6.5 yr
AVGOBroadcom Inc.$63M2.1%+86.0%3.0 yr
ANETArista Networks, Inc.$53M1.8%+58.5%1.5 yr
AMZNAmazon.com, Inc.$51M1.7%+9.5%10.5 yr
GILDGilead Sciences, Inc.$48M1.6%+27.7%10.5 yr
SCHWThe Charles Schwab Corpo$47M1.6%+21.5%10.5 yr
VVisa Inc.$46M1.6%-13.1%10.5 yr

Portfolio composition (YoY)

Industry mix
Semiconductors17.0%+11.0pp$503M
Internet Content & Information6.8%+1.5pp$200M
Asset Management5.5%-15.6pp$164M
Asset Management - Bonds5.5%+0.9pp$163M
Software - Application4.4%-1.8pp$129M
Software - Infrastructure4.0%-0.4pp$117M
Drug Manufacturers - General3.9%+1.5pp$115M
Financial - Credit Services3.8%-1.8pp$112M
Consumer Electronics3.5%-1.3pp$103M
Oil & Gas Exploration & Production3.0%+2.0pp$89M
Country
US95.2%+1.6pp
CA1.6%+0.2pp
Unknown0.9%+0.7pp
CH0.5%+0.3pp
TW0.5%+0.1pp
IL0.4%+0.0pp
IE0.3%-1.2pp
GB0.3%-1.1pp
Top 5: 20.9% · Top 10: 32.7% · Top 25: 52.5%

Winners

TickerPrev $PnLYoY %
NVDA$122M+0.07B60.9%
ANET$55M+0.03B58.5%
LRCX$16M+0.03B196.1%
AAPL$134M+0.02B14.7%
AMZN$109M+0.01B9.5%

Losers

TickerPrev $PnLYoY %
V$73M-0.01B-13.1%
MA$75M-0.01B-8.5%
NOW$48M-0.00B-34.3%
MSFT$103M-0.00B-0.6%
META$82M-0.00B-0.4%

Top buys this quarter · 15

CVX Chevron Corporation+$28M
FANG Diamondback Energy, Inc.+$26M
BKR Baker Hughes Company+$20M
CF CF Industries Holdings, Inc.new+$17M
RRC Range Resources Corporation+$15M
PR Permian Resources Corporation+$11M
GILD Gilead Sciences, Inc.+$9M
TPR Tapestry, Inc.+$9M
SOLS Solstice Advanced Materials Innew+$9M
BKD Brookdale Senior Living Inc.new+$8M

Top sells this quarter · 15

AMZN Amazon.com, Inc.$47M
MSFT Microsoft Corporation$39M
BX Blackstone Inc.exit$28M
NVDA NVIDIA Corporation$26M
LITE Lumentum Holdings Inc.$21M
MCHP Microchip Technology Incorpora$20M
DAL Delta Air Lines, Inc.exit$17M
PODD Insulet Corporationexit$17M
SPOT Spotify Technology S.A.exit$16M
ETN Eaton Corporation plc$16M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$2.95B290+27.95%+17.59%+10.36%-0.30B
2025-12-31$3.32B292+19.66%+17.72%+1.94%-0.26B
2025-09-30$3.49B282+21.69%+17.52%+4.17%-0.13B
2025-06-30$3.25B273+13.51%+14.94%-1.43%+0.04B
2025-03-31$2.81B278+2.95%+8.30%-5.36%+0.25B
2024-12-31$2.79B281+25.43%+24.89%+0.55%+0.23B
2024-09-30$2.45B271+35.85%+36.04%-0.19%-0.09B
2024-06-30$2.45B270+23.40%+24.49%-1.09%-0.05B
2024-03-31$2.40B278+28.45%+29.62%-1.17%-0.11B
2023-12-31$2.26B281+25.48%+26.18%-0.70%+0.04B
2023-09-30$1.96B274+19.47%+21.57%-2.10%-0.12B
2023-06-30$2.21B274+24.66%+19.42%+5.24%+0.01B
2023-03-31$2.04B272-3.58%-7.82%+4.24%-0.05B
2022-12-31$1.91B282+116.60%-18.17%+134.78%-0.01B
2022-09-30$1.79B281-1.57%-4.93%+3.36%-0.05B
2022-06-30$1.87B305-16.51%-16.11%-0.40%-0.07B