CASTLEARK MANAGEMENT LLC

CIK

1106832

Location

CHICAGO, IL

Portfolio Value

Mid $3,285,094,317

Diversification

Diversified

Filing Date

Global Rank

#983 / 8,700 ▲ 140

Top Industry

Semiconductors 17.2%

Period ended 2 months ago

Filed Aug 14, 2026 · 30d

26 quarters · since Mar 2020

Portfolio Concentration

279 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

7.9%

+0.7 pts

Top 5

24.7%

+1.5 pts

Top 10

37.8%

+2.3 pts

HHI

211

Diversified+16

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Technology	39.1%	$1,284,463,037	57
Industrials	13.6%	$446,380,276	61
Healthcare	11.7%	$383,179,099	34
Consumer Cyclical	10.9%	$357,795,616	33
Financial Services	9.1%	$299,760,829	18
Communication Services	7.3%	$241,387,521	3
Energy	5.2%	$169,738,697	44
Basic Materials	1.4%	$47,451,515	9
Consumer Defensive	1.0%	$32,785,083	7
Utilities	0.3%	$11,303,880	8
Unclassified	0.3%	$10,315,650	4
Real Estate	0.0%	$533,114	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
RIG	Transocean Ltd.	+976,040	1,813,160	$8,866,352
GILD	Gilead Sciences, Inc.	+185,392	527,542	$66,649,656
MS	Morgan Stanley	+184,862	208,542	$43,593,619
BKNG	Booking Holdings Inc.	+131,880	136,776	$24,378,954
AAPL	Apple Inc.	+122,097	472,108	$136,609,170
GM	General Motors Co	+100,160	199,440	$15,372,835
V	Visa Inc.	+82,340	236,166	$81,026,192
HQY	Healthequity, Inc.	+79,260	127,770	$11,540,186
GOOGL	Alphabet Inc.	+66,464	514,093	$183,693,135
TWLO	Twilio Inc	+65,630	92,390	$19,062,828
XMTR	Xometry, Inc.	+62,750	117,518	$11,342,837
TPR	Tapestry, Inc.	+61,279	265,749	$38,900,338
NOVT	Novanta Inc	+48,200	83,190	$13,496,745
ADI	Analog Devices Inc	+43,026	120,934	$48,031,356
ANET	Arista Networks, Inc.	+42,384	473,319	$80,407,431
NVDA	Nvidia Corp	+41,593	1,299,605	$260,037,964
AVGO	Broadcom Inc.	+41,192	243,896	$92,131,714
FROG	JFrog Ltd	+36,650	129,480	$11,767,142
MCO	Moodys Corp /De/	+36,544	53,444	$24,205,856
C	Citigroup Inc	+36,250	83,734	$11,719,410
COGT	Cogent Biosciences, Inc.	+35,920	99,870	$3,864,969
TKR	Timken Co	+35,010	75,400	$10,957,128
JBHT	Hunt J B Transport Services Inc	+33,920	56,520	$16,358,583
BA	Boeing Co	+33,440	59,520	$12,884,294
LBRT	Liberty Energy Inc.	+31,840	296,629	$7,768,713
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
SCHW	Schwab Charles Corp	−494,693	9,360	$863,647
PR	Permian Resources Corp	−360,030	270,950	$4,988,189
VIAV	Viavi Solutions Inc.	−358,556	20,041	$956,957
SHOP	Shopify Inc.	−223,426	87,164	$9,952,385
RRC	Range Resources Corp	−205,260	205,260	$7,633,619
MCHP	Microchip Technology Inc	−170,874	34,000	$3,100,800
ARQT	Arcutis Biotherapeutics, Inc.	−156,040	137,420	$3,603,152
DOCN	DigitalOcean Holdings, Inc.	−146,712	35,537	$5,580,375
CVX	Chevron Corp	−124,700	11,850	$1,964,256
EUAD	Select STOXX Europe Aerospace & Defense ETF	−116,200	30,800	$1,299,144
NXT	Nextpower Inc.	−96,724	17,350	$2,067,079
FTI	TechnipFMC plc	−90,500	44,676	$2,962,018
GH	Guardant Health, Inc.	−79,990	80,293	$12,046,358
PL	Planet Labs PBC	−64,200	221,450	$7,336,638
TTMI	Ttm Technologies Inc	−63,140	28,090	$5,253,391
ACA	Arcosa, Inc.	−60,560	14,090	$2,047,136
PTCT	Ptc Therapeutics, Inc.	−57,980	33,900	$2,765,223
BKR	Baker Hughes Co	−57,170	330,020	$18,316,110
CF	CF Industries Holdings, Inc.	−55,540	73,610	$7,969,018
FANG	Diamondback Energy, Inc.	−54,340	90,680	$15,939,730
BE	Bloom Energy Corp	−53,585	1,460	$441,942
LRCX	Lam Research Corp	−52,932	283,808	$122,982,520
TSEM	Tower Semiconductor Ltd	−49,560	3,680	$959,155
APG	APi Group Corp	−47,450	152,813	$6,471,630
SGI	Somnigroup International Inc.	−46,695	2,090	$163,856
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
SN	SharkNinja, Inc.	127,170	$19,364,175
RUSHA	Rush Enterprises Inc \Tx\	113,950	$12,474,969
HXL	Hexcel Corp /De/	106,050	$10,611,363
CROX	Crocs, Inc.	85,810	$10,352,118
SXT	Sensient Technologies Corp	82,920	$10,223,206
MXL	Maxlinear, Inc	79,780	$10,214,233
ULS	UL Solutions Inc.	96,780	$9,858,010
CWST	Casella Waste Systems Inc	100,460	$9,741,606
CDNL	Cardinal Infrastructure Group Inc.	103,023	$9,704,766
RAL	Ralliant Corp	128,740	$9,479,126
WSC	WillScot Holdings Corp	325,950	$9,406,917
LTH	Life Time Group Holdings, Inc.	229,298	$9,364,530
OPLN	OPENLANE, Inc.	217,210	$8,957,740
WULF	Terawulf Inc.	353,080	$8,721,076
INTC	Intel Corp	61,560	$8,595,622
TGTX	Tg Therapeutics, Inc.	150,990	$8,295,390
PRAX	Praxis Precision Medicines, Inc.	24,390	$8,165,528
BRKR	Bruker Corp	134,270	$8,080,368
MOH	Molina Healthcare, Inc.	33,790	$7,727,773
PENN	PENN Entertainment, Inc.	351,920	$7,517,011
HRI	Herc Holdings Inc	48,490	$6,950,556
MSM	Msc Industrial Direct Co Inc	58,250	$6,928,837
CAVA	Cava Group, Inc.	86,440	$6,783,811
DGX	Quest Diagnostics Inc	31,480	$6,672,186
PTGX	Protagonist Therapeutics, Inc	50,570	$6,198,870
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
AAXJ	iShares MSCI All Country Asia ex Japan ETF	4,245,180	$155,576,625
BWX	State Street SPDR Bloomberg International Treasury Bond ETF	2,769,270	$100,500,344
BNDW	Vanguard Total World Bond ETF	1,487,800	$69,852,210
—		1,379,420	$47,172,626
—		448,330	$33,499,217
ULTA	Ulta Beauty, Inc.	50,629	$26,464,284
FIVE	Five Below, Inc	40,110	$9,164,332
TPC	Tutor Perini Corp	116,440	$8,988,003
HAS	Hasbro, Inc.	94,701	$8,864,013
SPXC	SPX Technologies, Inc.	41,567	$8,310,905
XLBI	State Street Materials Select Sector SPDR Premium Income ETF	56,130	$8,229,219
PAHC	Phibro Animal Health Corp	142,900	$7,903,799
KTOS	Kratos Defense & Security Solutions, Inc.	109,634	$7,730,293
ADSK	Autodesk, Inc.	31,940	$7,646,436
IPGP	Ipg Photonics Corp	60,456	$6,927,653
PATK	Patrick Industries Inc	62,180	$6,906,332
ATMU	Atmus Filtration Technologies Inc.	119,350	$6,775,499
SSD	Simpson Manufacturing Co., Inc.	38,382	$6,587,118
CHDN	Churchill Downs Inc	67,810	$6,091,372
IDCC	InterDigital, Inc.	19,876	$6,002,552
ONTO	Onto Innovation Inc.	29,030	$5,953,182
FSLY	Fastly, Inc.	177,688	$5,163,613
MEDP	Medpace Holdings, Inc.	10,030	$4,816,305
RYTM	Rhythm Pharmaceuticals, Inc.	52,279	$4,546,704
F	Ford Motor Co	380,230	$4,387,854
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

279 tracked positions · $3,285,094,317 total · filing declares 309 positions · $3,709,338,225 · as of Jun 30, 2026

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

Showing 1–50 of 279 positions by value · page 1 of 6

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
NVDA	Nvidia Corp Technology	Added	1,299,605	+41,593	$260,037,964	+18.5%	7.92%
GOOGL	Alphabet Inc. Communication Services	Added	514,093	+66,464	$183,693,135	+42.7%	5.59%
AAPL	Apple Inc. Technology	Added	472,108	+122,097	$136,609,170	+53.8%	4.16%
LRCX	Lam Research Corp Technology	Reduced	283,808	-52,932	$122,982,520	+70.9%	3.74%
MSFT	Microsoft Corp Technology	Added	292,770	+28,668	$109,209,065	+11.7%	3.32%
LLY	ELI LILLY & Co Healthcare	Added	87,697	+14,219	$105,186,421	+55.6%	3.20%
AVGO	Broadcom Inc. Technology	Added	243,896	+41,192	$92,131,714	+46.8%	2.80%
V	Visa Inc. Financial Services	Added	236,166	+82,340	$81,026,192	+74.3%	2.47%
ANET	Arista Networks, Inc. Technology	Added	473,319	+42,384	$80,407,431	+52.0%	2.45%
AMD	Advanced Micro Devices Inc Technology	Added	118,865	+29,911	$69,049,867	+281.6%	2.10%
GILD	Gilead Sciences, Inc. Healthcare	Added	527,542	+185,392	$66,649,656	+39.8%	2.03%
AMZN	Amazon Com Inc Consumer Cyclical	Added	268,249	+22,388	$63,934,466	+24.9%	1.95%
GEV	GE Vernova Inc. Industrials	Added	46,101	+4,612	$54,162,220	+49.6%	1.65%
META	Meta Platforms, Inc. Communication Services	Reduced	93,744	-30,221	$52,805,057	−25.5%	1.61%
ADI	Analog Devices Inc Technology	Added	120,934	+43,026	$48,031,356	+93.8%	1.46%
MA	Mastercard Inc Financial Services	Reduced	91,462	-551	$46,974,883	+2.2%	1.43%
MS	Morgan Stanley Financial Services	Added	208,542	+184,862	$43,593,619	+1018.6%	1.33%
SNOW	Snowflake Inc. Technology	Added	166,818	+30,774	$42,455,181	+106.9%	1.29%
VRT	Vertiv Holdings Co Industrials	Added	123,901	+11,538	$41,484,532	+47.3%	1.26%
TPR	Tapestry, Inc. Consumer Cyclical	Added	265,749	+61,279	$38,900,338	+34.8%	1.18%
NOW	ServiceNow, Inc. Technology	Added	321,623	+17,867	$31,930,731	+0.5%	0.97%
BKNG	Booking Holdings Inc. Consumer Cyclical	Added	136,776	+131,880	$24,378,954	+18.3%	0.74%
MCO	Moodys Corp /De/ Financial Services	Added	53,444	+36,544	$24,205,856	+228.3%	0.74%
TSLA	Tesla, Inc. Consumer Cyclical	Added	48,070	+8,890	$20,218,242	+38.8%	0.62%
CAT	Caterpillar Inc Industrials	Added	18,980	+5,060	$20,211,802	+105.0%	0.62%
GE	General Electric Co Industrials	Added	52,830	+22,150	$19,744,155	+126.8%	0.60%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Held	41,210	0	$19,680,659	+41.3%	0.60%
LGND	Ligand Pharmaceuticals Inc Healthcare	Added	62,043	+13,347	$19,611,171	+101.7%	0.60%
SN	SharkNinja, Inc. Consumer Cyclical	NEW	127,170	NEW	$19,364,175	NEW	0.59%
TWLO	Twilio Inc Technology	Added	92,390	+65,630	$19,062,828	+466.2%	0.58%
BKR	Baker Hughes Co Energy	Reduced	330,020	-57,170	$18,316,110	−22.5%	0.56%
GTX	Garrett Motion Inc. Consumer Cyclical	Reduced	469,470	-18,530	$17,008,898	+91.8%	0.52%
JPM	Jpmorgan Chase & Co Financial Services	Held	50,525	0	$16,538,348	+11.3%	0.50%
ASND	Ascendis Pharma A/S Healthcare	Reduced	61,696	-5,920	$16,455,557	+6.4%	0.50%
JBHT	Hunt J B Transport Services Inc Industrials	Added	56,520	+33,920	$16,358,583	+241.6%	0.50%
FANG	Diamondback Energy, Inc. Energy	Reduced	90,680	-54,340	$15,939,730	−44.4%	0.49%
GM	General Motors Co Consumer Cyclical	Added	199,440	+100,160	$15,372,835	+107.8%	0.47%
BTSG	BrightSpring Health Services, Inc. Healthcare	Reduced	212,430	-34,770	$14,814,868	+40.6%	0.45%
SMTC	Semtech Corp Technology	Reduced	91,218	-16,540	$14,763,633	+78.2%	0.45%
FCFS	FirstCash Holdings, Inc. Financial Services	Reduced	68,190	-2,540	$14,750,860	+10.9%	0.45%
MAR	Marriott International Inc /Md/ Consumer Cyclical	Added	37,910	+29,550	$14,049,066	+413.8%	0.43%
TJX	Tjx Companies Inc /De/ Consumer Cyclical	Held	90,620	0	$13,728,930	−5.1%	0.42%
UBER	Uber Technologies, Inc Technology	Added	189,417	+19,541	$13,668,330	+11.9%	0.42%
UCTT	Ultra Clean Holdings, Inc. Technology	Reduced	95,770	-4,360	$13,655,844	+119.3%	0.42%
NOVT	Novanta Inc Technology	Added	83,190	+48,200	$13,496,745	+226.6%	0.41%
AXON	Axon Enterprise, Inc. Industrials	Added	23,423	+14,562	$13,131,168	+248.9%	0.40%
BA	Boeing Co Industrials	Added	59,520	+33,440	$12,884,294	+148.2%	0.39%
ESI	Element Solutions Inc Basic Materials	Reduced	263,644	-10,240	$12,589,001	+34.6%	0.38%
RUSHA	Rush Enterprises Inc \Tx\ Consumer Cyclical	NEW	113,950	NEW	$12,474,969	NEW	0.38%
MYRG	Myr Group Inc. Industrials	Added	24,920	+7,360	$12,469,968	+151.5%	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.