CASTLEARK MANAGEMENT LLC

CIK

1106832

Location

CHICAGO, IL

Portfolio Value

Mid $2,553,542,391

Diversification

Diversified

Filing Date

Global Rank

#1,046 / 8,603 ▼ 87 · as of Mar 2026

Top Industry

Semiconductors 15.7%

3Y Alpha vs SPY

-3.5%

Period ended 3 months ago

Filed May 15, 2026 · 55d

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+63.0%

SPY

+76.0%

Annualised alpha

-3.0%

Max drawdown

−26.3%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

262 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

8.6%

−0.4 pts

Top 5

23.4%

−3.2 pts

Top 10

35.4%

−3.7 pts

HHI

202

Diversified−32

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	37.4%	$955,520,956	52
Industrials	11.7%	$298,751,617	55
Healthcare	10.9%	$278,270,311	30
Consumer Cyclical	10.7%	$272,802,986	35
Energy	9.2%	$234,431,802	44
Financial Services	8.8%	$223,473,685	18
Communication Services	7.5%	$191,129,638	2
Basic Materials	1.8%	$44,928,809	8
Consumer Defensive	1.4%	$36,632,778	8
Unclassified	0.4%	$10,167,955	3
Utilities	0.2%	$4,147,937	6
Real Estate	0.1%	$3,283,917	1

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
RRC	Range Resources Corp	+336,500	410,520	$18,547,293
BKR	Baker Hughes Co	+334,110	387,190	$23,637,949
ELAN	Elanco Animal Health Inc	+321,440	355,950	$8,517,883
FAST	Fastenal Co	+141,770	148,690	$6,899,216
QXO	QXO, Inc.	+92,280	375,807	$7,298,171
BTSG	BrightSpring Health Services, Inc.	+88,600	247,200	$10,533,192
GILD	Gilead Sciences, Inc.	+64,822	342,150	$47,685,445
TPR	Tapestry, Inc.	+62,386	204,470	$28,852,761
COCO	Vita Coco Company, Inc.	+61,050	97,610	$4,676,495
GOOGL	Alphabet Inc.	+36,380	418,019	$120,205,543
NOW	ServiceNow, Inc.	+33,336	303,756	$31,757,689
OXY	Occidental Petroleum Corp /De/	+29,480	52,585	$3,418,025
VIAV	Viavi Solutions Inc.	+29,227	378,597	$12,599,708
ACA	Arcosa, Inc.	+26,150	74,650	$7,923,351
MOD	Modine Manufacturing Co	+25,890	37,850	$8,202,473
ASB	Associated Banc-Corp	+21,850	311,423	$8,053,398
HAS	Hasbro, Inc.	+21,800	94,701	$8,864,013
IPGP	Ipg Photonics Corp	+21,766	60,456	$6,927,653
ANET	Arista Networks, Inc.	+19,658	430,935	$52,910,199
CHDN	Churchill Downs Inc	+19,240	67,810	$6,091,372
VSEC	Vse Corp	+17,430	50,086	$9,235,858
JBHT	Hunt J B Transport Services Inc	+16,940	22,600	$4,788,940
ADI	Analog Devices Inc	+16,736	77,908	$24,785,651
CRK	Comstock Resources Inc	+15,370	33,370	$703,439
TXRH	Texas Roadhouse, Inc.	+14,490	41,410	$6,838,447
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
RKT	Rocket Companies, Inc.	−446,600	34,960	$498,180
MCHP	Microchip Technology Inc	−310,620	204,874	$13,236,909
RIG	Transocean Ltd.	−304,570	837,120	$5,550,105
AMZN	Amazon Com Inc	−226,288	245,861	$51,205,470
EYE	National Vision Holdings, Inc.	−181,930	117,736	$3,049,362
NVDA	Nvidia Corp	−150,134	1,258,012	$219,397,292
UBER	Uber Technologies, Inc	−139,260	169,876	$12,219,180
SCHW	Schwab Charles Corp	−118,482	504,053	$47,370,900
XMTR	Xometry, Inc.	−112,710	54,768	$2,236,725
MSFT	Microsoft Corp	−105,358	264,102	$97,762,637
PL	Planet Labs PBC	−103,820	285,650	$7,983,917
CELH	Celsius Holdings, Inc.	−101,940	67,902	$2,409,162
MRCY	Mercury Systems Inc	−93,410	25,048	$1,826,249
C	Citigroup Inc	−69,980	47,484	$5,385,160
FTI	TechnipFMC plc	−65,710	135,176	$9,344,716
ODFL	Old Dominion Freight Line, Inc.	−61,820	33,910	$6,626,014
SEI	Solaris Energy Infrastructure, Inc.	−56,740	94,256	$5,326,406
MS	Morgan Stanley	−55,790	23,680	$3,897,017
ETN	Eaton Corp plc	−43,924	590	$211,025
KTOS	Kratos Defense & Security Solutions, Inc.	−43,270	109,634	$7,730,293
TTMI	Ttm Technologies Inc	−40,620	91,230	$8,887,626
AAPL	Apple Inc.	−37,030	350,011	$88,829,291
LRCX	Lam Research Corp	−36,136	336,740	$71,947,868
SHOP	Shopify Inc.	−34,792	310,590	$36,842,185
BBIO	BridgeBio Pharma, Inc.	−32,280	81,737	$6,069,789
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
FANG	Diamondback Energy, Inc.	145,020	$28,683,505
CVX	Chevron Corp	136,550	$28,252,195
CF	CF Industries Holdings, Inc.	129,150	$16,768,836
PR	Permian Resources Corp	630,980	$13,452,493
TSEM	Tower Semiconductor Ltd	53,240	$9,342,555
JAZZ	Jazz Pharmaceuticals plc	48,740	$9,214,297
SOLS	Solstice Advanced Materials Inc.	113,050	$8,609,888
BKD	Brookdale Senior Living Inc.	598,454	$8,186,850
PAHC	Phibro Animal Health Corp	142,900	$7,903,799
ADSK	Autodesk, Inc.	31,940	$7,646,436
LBRT	Liberty Energy Inc.	264,789	$7,625,923
MCO	Moodys Corp /De/	16,900	$7,372,625
KNX	Knight-Swift Transportation Holdings Inc.	126,030	$7,256,807
KLIC	Kulicke & Soffa Industries Inc	106,380	$6,991,293
PAY	Paymentus Holdings, Inc.	270,770	$6,877,558
ATMU	Atmus Filtration Technologies Inc.	119,350	$6,775,499
UCTT	Ultra Clean Holdings, Inc.	100,130	$6,226,083
LINC	Lincoln Educational Services Corp	150,610	$6,126,814
GWW	W.W. Grainger, Inc.	5,610	$6,119,444
WH	Wyndham Hotels & Resorts, Inc.	75,200	$6,108,496
ALSN	Allison Transmission Holdings Inc	50,630	$5,926,747
BC	Brunswick Corp	79,110	$5,756,043
SJM	J M SMUCKER Co	59,580	$5,745,895
MPC	Marathon Petroleum Corp	22,400	$5,469,632
CGNX	Cognex Corp	110,240	$5,400,657
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
BX	Blackstone Inc.	244,268	$37,651,469
PODD	Insulet Corp	80,957	$23,011,217
SPOT	Spotify Technology S.A.	33,465	$19,433,460
DAL	Delta Air Lines, Inc.	260,740	$18,095,356
SANM	Sanmina Corp	72,459	$10,873,922
WGS	GeneDx Holdings Corp.	74,016	$9,626,520
CECO	Ceco Environmental Corp	156,505	$9,366,824
JBTM	JBT MAREL Corp	58,539	$8,820,071
RMBS	Rambus Inc	95,578	$8,782,662
PLNT	Planet Fitness, Inc.	80,305	$8,710,683
HCI	HCI Group, Inc.	42,585	$8,163,118
MIR	Mirion Technologies, Inc.	348,130	$8,153,204
AR	ANTERO RESOURCES Corp	234,290	$8,073,633
COF	Capital One Financial Corp	32,920	$7,978,491
PEGA	Pegasystems Inc	133,167	$7,952,733
VMI	Valmont Industries Inc	19,706	$7,928,117
CRDO	Credo Technology Group Holding Ltd	54,916	$7,901,863
GTES	Gates Industrial Corp plc	357,932	$7,684,800
SIG	Signet Jewelers Ltd	89,388	$7,408,477
PI	Impinj Inc	40,540	$7,054,365
DG	Dollar General Corp	51,930	$6,894,746
HRI	Herc Holdings Inc	45,600	$6,766,128
TPB	Turning Point Brands, Inc.	61,944	$6,714,729
SLV	iShares Silver Trust	102,570	$6,607,559
ADPT	Adaptive Biotechnologies Corp	390,874	$6,347,793
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

262 positions · $2,553,542,391 total · as of Mar 31, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Real Estate Technology Utilities

Showing 1–50 of 262 positions by value · page 1 of 6

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
NVDA	Nvidia Corp Technology	Reduced	1,258,012	-150,134	$219,397,292	−16.5%	8.59%
GOOGL	Alphabet Inc. Communication Services	Added	418,019	+36,380	$120,205,543	+0.6%	4.71%
MSFT	Microsoft Corp Technology	Reduced	264,102	-105,358	$97,762,637	−45.3%	3.83%
AAPL	Apple Inc. Technology	Reduced	350,011	-37,030	$88,829,291	−15.6%	3.48%
LRCX	Lam Research Corp Technology	Reduced	336,740	-36,136	$71,947,868	+12.7%	2.82%
META	Meta Platforms, Inc. Communication Services	Added	123,965	+1,550	$70,924,095	−12.2%	2.78%
LLY	ELI LILLY & Co Healthcare	Reduced	73,478	-8,100	$67,582,860	−22.9%	2.65%
AVGO	Broadcom Inc. Technology	Reduced	202,704	-3,176	$62,738,915	−12.0%	2.46%
ANET	Arista Networks, Inc. Technology	Added	430,935	+19,658	$52,910,199	−1.8%	2.07%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	245,861	-226,288	$51,205,470	−53.0%	2.01%
GILD	Gilead Sciences, Inc. Healthcare	Added	342,150	+64,822	$47,685,445	+40.1%	1.87%
SCHW	Schwab Charles Corp Financial Services	Reduced	504,053	-118,482	$47,370,900	−23.8%	1.86%
V	Visa Inc. Financial Services	Reduced	153,826	-16,652	$46,492,370	−22.2%	1.82%
MA	Mastercard Inc Financial Services	Reduced	92,013	-10,438	$45,975,215	−21.4%	1.80%
SHOP	Shopify Inc. Technology	Reduced	310,590	-34,792	$36,842,185	−33.7%	1.44%
GEV	GE Vernova Inc. Industrials	Reduced	41,489	-6,252	$36,215,748	+16.1%	1.42%
NOW	ServiceNow, Inc. Technology	Added	303,756	+33,336	$31,757,689	−23.3%	1.24%
TPR	Tapestry, Inc. Consumer Cyclical	Added	204,470	+62,386	$28,852,761	+58.9%	1.13%
FANG	Diamondback Energy, Inc. Energy	NEW	145,020	NEW	$28,683,505	NEW	1.12%
CVX	Chevron Corp Energy	NEW	136,550	NEW	$28,252,195	NEW	1.11%
VRT	Vertiv Holdings Co Industrials	Reduced	112,363	-12,374	$28,155,920	+39.3%	1.10%
ULTA	Ulta Beauty, Inc. Consumer Cyclical	Added	50,629	+688	$26,464,284	−12.4%	1.04%
ADI	Analog Devices Inc Technology	Added	77,908	+16,736	$24,785,651	+49.4%	0.97%
BKR	Baker Hughes Co Energy	Added	387,190	+334,110	$23,637,949	+877.9%	0.93%
SNOW	Snowflake Inc. Technology	Reduced	136,044	-15,148	$20,518,156	−38.1%	0.80%
RRC	Range Resources Corp Energy	Added	410,520	+336,500	$18,547,293	+610.6%	0.73%
AMD	Advanced Micro Devices Inc Technology	Reduced	88,954	-15,792	$18,095,912	−19.3%	0.71%
CF	CF Industries Holdings, Inc. Basic Materials	NEW	129,150	NEW	$16,768,836	NEW	0.66%
DOCN	DigitalOcean Holdings, Inc. Technology	Reduced	182,249	-2,740	$15,633,319	+75.6%	0.61%
ASND	Ascendis Pharma A/S Healthcare	Added	67,616	+1,280	$15,465,807	+9.3%	0.61%
AEIS	Advanced Energy Industries Inc Industrials	Reduced	46,623	-2,510	$15,045,708	+46.3%	0.59%
JPM	Jpmorgan Chase & Co Financial Services	Added	50,525	+5,890	$14,862,434	+3.3%	0.58%
GH	Guardant Health, Inc. Healthcare	Reduced	160,283	-4,760	$14,805,340	−12.2%	0.58%
TSLA	Tesla, Inc. Consumer Cyclical	Added	39,180	+11,080	$14,565,165	+15.3%	0.57%
TJX	Tjx Companies Inc /De/ Consumer Cyclical	Held	90,620	0	$14,472,014	+4.0%	0.57%
WMT	Walmart Inc. Consumer Defensive	Held	113,270	0	$14,077,195	+11.6%	0.55%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Added	41,210	+4,920	$13,926,919	+26.3%	0.55%
NXT	Nextpower Inc. Technology	Added	114,074	+8,590	$13,751,620	+49.7%	0.54%
PR	Permian Resources Corp Energy	NEW	630,980	NEW	$13,452,493	NEW	0.53%
FCFS	FirstCash Holdings, Inc. Financial Services	Added	70,730	+9,530	$13,297,240	+36.3%	0.52%
MCHP	Microchip Technology Inc Technology	Reduced	204,874	-310,620	$13,236,909	−59.7%	0.52%
VIAV	Viavi Solutions Inc. Technology	Added	378,597	+29,227	$12,599,708	+102.4%	0.49%
EQT	EQT Corp Energy	Reduced	193,845	-11,920	$12,336,295	+11.9%	0.48%
UBER	Uber Technologies, Inc Technology	Reduced	169,876	-139,260	$12,219,180	−51.6%	0.48%
DY	Dycom Industries Inc Industrials	Reduced	32,506	-5,660	$11,013,682	−14.6%	0.43%
BTSG	BrightSpring Health Services, Inc. Healthcare	Added	247,200	+88,600	$10,533,192	+77.3%	0.41%
HLIO	Helios Technologies, Inc. Industrials	Added	160,409	+13,660	$10,380,066	+32.2%	0.41%
CAT	Caterpillar Inc Industrials	Held	13,920	0	$9,861,763	+23.7%	0.39%
LGND	Ligand Pharmaceuticals Inc Healthcare	Reduced	48,696	-18,040	$9,722,156	−22.9%	0.38%
WMB	Williams Companies, Inc. Energy	Added	131,770	+6,040	$9,590,220	+26.9%	0.38%