CASTLEARK MANAGEMENT LLC

CIK

1106832

Location

CHICAGO, IL

Portfolio Value

Mid $2,584,484,916

Diversification

Diversified

Filing Date

Global Rank

#1,042 / 8,622 ▼ 92 · as of Mar 2026

Top Industry

Semiconductors 15.5%

3Y Alpha vs SPY

-2.5%

Period ended 4 months ago

Filed May 15, 2026 · 3mo

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.

Cloned portfolio

+61.9%

SPY

+67.9%

Annualised alpha

-1.4%

Max drawdown

−26.1%

Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.

Portfolio Concentration

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

Top Position

8.5%

−0.4 pts

Top 5

23.1%

−3.1 pts

Top 10

35.0%

−3.7 pts

HHI

198

Diversified−32

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	37.0%	$955,520,956	52
Industrials	11.6%	$298,968,682	55
Consumer Cyclical	11.3%	$292,592,163	35
Healthcare	10.8%	$278,270,311	30
Energy	9.5%	$245,368,085	45
Financial Services	8.6%	$223,473,685	18
Communication Services	7.4%	$191,129,638	2
Basic Materials	1.7%	$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
XOM	ExxonMobil Holdings Corp	64,460	$10,936,283
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
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
PIPR	Piper Sandler Companies	32,456	$11,025,627
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
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

263 tracked positions · $2,584,484,916 total · filing declares 292 positions · $3,022,181,841 · 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 263 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%	8.49%
GOOGL	Alphabet Inc. Communication Services	Added	418,019	+36,380	$120,205,543	+0.6%	4.65%
MSFT	Microsoft Corp Technology	Reduced	264,102	-105,358	$97,762,637	−45.3%	3.78%
AAPL	Apple Inc. Technology	Reduced	350,011	-37,030	$88,829,291	−15.6%	3.44%
LRCX	Lam Research Corp Technology	Reduced	336,740	-36,136	$71,947,868	+12.7%	2.78%
META	Meta Platforms, Inc. Communication Services	Added	123,965	+1,550	$70,924,095	−12.2%	2.74%
LLY	ELI LILLY & Co Healthcare	Reduced	73,478	-8,100	$67,582,860	−22.9%	2.61%
AVGO	Broadcom Inc. Technology	Reduced	202,704	-3,176	$62,738,915	−12.0%	2.43%
ANET	Arista Networks, Inc. Technology	Added	430,935	+19,658	$52,910,199	−1.8%	2.05%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	245,861	-226,288	$51,205,470	−53.0%	1.98%
GILD	Gilead Sciences, Inc. Healthcare	Added	342,150	+64,822	$47,685,445	+40.1%	1.85%
SCHW	Schwab Charles Corp Financial Services	Reduced	504,053	-118,482	$47,370,900	−23.8%	1.83%
V	Visa Inc. Financial Services	Reduced	153,826	-16,652	$46,492,370	−22.2%	1.80%
MA	Mastercard Inc Financial Services	Reduced	92,013	-10,438	$45,975,215	−21.4%	1.78%
SHOP	Shopify Inc. Technology	Reduced	310,590	-34,792	$36,842,185	−33.7%	1.43%
GEV	GE Vernova Inc. Industrials	Reduced	41,489	-6,252	$36,215,748	+16.1%	1.40%
NOW	ServiceNow, Inc. Technology	Added	303,756	+33,336	$31,757,689	−23.3%	1.23%
TPR	Tapestry, Inc. Consumer Cyclical	Added	204,470	+62,386	$28,852,761	+58.9%	1.12%
FANG	Diamondback Energy, Inc. Energy	NEW	145,020	NEW	$28,683,505	NEW	1.11%
CVX	Chevron Corp Energy	NEW	136,550	NEW	$28,252,195	NEW	1.09%
VRT	Vertiv Holdings Co Industrials	Reduced	112,363	-12,374	$28,155,920	+39.3%	1.09%
ULTA	Ulta Beauty, Inc. Consumer Cyclical	Added	50,629	+688	$26,464,284	−12.4%	1.02%
ADI	Analog Devices Inc Technology	Added	77,908	+16,736	$24,785,651	+49.4%	0.96%
BKR	Baker Hughes Co Energy	Added	387,190	+334,110	$23,637,949	+877.9%	0.91%
BKNG	Booking Holdings Inc. Consumer Cyclical	Reduced	4,896	-576	$20,613,726	−29.7%	0.80%
SNOW	Snowflake Inc. Technology	Reduced	136,044	-15,148	$20,518,156	−38.1%	0.79%
RRC	Range Resources Corp Energy	Added	410,520	+336,500	$18,547,293	+610.6%	0.72%
AMD	Advanced Micro Devices Inc Technology	Reduced	88,954	-15,792	$18,095,912	−19.3%	0.70%
CF	CF Industries Holdings, Inc. Basic Materials	NEW	129,150	NEW	$16,768,836	NEW	0.65%
DOCN	DigitalOcean Holdings, Inc. Technology	Reduced	182,249	-2,740	$15,633,319	+75.6%	0.60%
ASND	Ascendis Pharma A/S Healthcare	Added	67,616	+1,280	$15,465,807	+9.3%	0.60%
AEIS	Advanced Energy Industries Inc Industrials	Reduced	46,623	-2,510	$15,045,708	+46.3%	0.58%
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%	0.57%
TSLA	Tesla, Inc. Consumer Cyclical	Added	39,180	+11,080	$14,565,165	+15.3%	0.56%
TJX	Tjx Companies Inc /De/ Consumer Cyclical	Held	90,620	0	$14,472,014	+4.0%	0.56%
WMT	Walmart Inc. Consumer Defensive	Held	113,270	0	$14,077,195	+11.6%	0.54%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Added	41,210	+4,920	$13,926,919	+26.3%	0.54%
NXT	Nextpower Inc. Technology	Added	114,074	+8,590	$13,751,620	+49.7%	0.53%
PR	Permian Resources Corp Energy	NEW	630,980	NEW	$13,452,493	NEW	0.52%
FCFS	FirstCash Holdings, Inc. Financial Services	Added	70,730	+9,530	$13,297,240	+36.3%	0.51%
MCHP	Microchip Technology Inc Technology	Reduced	204,874	-310,620	$13,236,909	−59.7%	0.51%
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%	0.47%
DY	Dycom Industries Inc Industrials	Reduced	32,506	-5,660	$11,013,682	−14.6%	0.43%
XOM	ExxonMobil Holdings Corp Energy	NEW	64,460	NEW	$10,936,283	NEW	0.42%
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%	0.40%
CAT	Caterpillar Inc Industrials	Held	13,920	0	$9,861,763	+23.7%	0.38%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.