CASTLEARK MANAGEMENT LLC

Registered adviser

CIK

1106832

Location

CHICAGO, IL

Portfolio Value

Mid $3,713,497,280

Diversification

Diversified

Filing Date

Global Rank

#1,092 / 8,818 ▲ 31

Top Industry

Semiconductors 17.2%

Period ended 4 months ago

Filed Aug 14, 2026 · 2mo

26 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Oct 1, 2026

Form ADV adviser

CRD 109587

Roster of Oct 1, 2026

Regulatory AUM

$4,585,548,400

Main clients

Governments and sovereign funds (59% of AUM)

Registered funds advised

1 series (0 index, 1 ETF)

$333,425,590 net assets· N-CEN Oct 31, 2025

Private funds on Schedule D 7.B.(1)

As filed Mar 30, 2024; SEC's bulk Form ADV archive ends with 2024 filings.

No private funds listed.

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
May 2026 to Oct 2026	$4,585,548,400	Governments and sovereign funds (59%)
Jun 2025 to Apr 2026	$3,970,780,800	Governments and sovereign funds (69%)
Apr 2025 to May 2025	$3,681,269,800	Governments and sovereign funds (71%)
Apr 2024 to Mar 2025	$3,059,938,100	Governments and sovereign funds (68%)
May 2023 to Mar 2024	$2,782,446,000	Governments and sovereign funds (79%)
Apr 2023	$2,782,446,000	Governments and sovereign funds (79%)

5 earlier changes not shown.

Stated strategy

Fundamental active, Growth Form ADV Part 2A, Apr 1, 2026 · original

In the firm's words

Fundamental active: All our portfolio management teams conduct extensive research on individual companies
Growth: looking for opportunities to invest in companies that are expected to achieve superior earnings growth

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.

Style

Diversified active

Top 10 weight 36.5%, 50.8 effective positions, active share 59.3% against every 13F filer's combined book; it meets none of the index-like, systematic-like or concentrated tests

Turnover

Medium turnover

69.0% over the last four quarters (30% to under 100%)

Horizon

Long horizon

Value-weighted holding period 12.8 quarters (12+), a floor since 35.4% of the book was already held when coverage starts

Closest benchmark: every 13F filer's combined book, active share 59.3%; sector active share 12.5% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

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

Top Position

7.0%

−0.3 pts

Top 5

23.3%

+0.0 pts

Top 10

36.5%

+1.0 pts

HHI

197

Diversified+3

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Technology	34.6%	$1,284,463,037	57
Industrials	12.0%	$446,380,276	61
Unclassified	11.8%	$438,717,766	33
Healthcare	10.3%	$383,179,099	34
Consumer Cyclical	9.6%	$357,796,462	33
Financial Services	8.1%	$299,760,829	18
Communication Services	6.5%	$241,387,521	4
Energy	4.6%	$169,738,698	44
Basic Materials	1.3%	$47,451,515	9
Consumer Defensive	0.9%	$32,785,083	7
Utilities	0.3%	$11,303,880	8
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
EWA	iShares MSCI Australia ETF	+201,290	205,060	$5,774,489
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
GOOGL	Alphabet Inc.	+89,074	507,093	$181,219,825
V	Visa Inc.	+82,340	236,166	$81,026,192
HQY	Healthequity, Inc.	+79,260	127,770	$11,540,186
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	+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
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	Spinnaker ETF Series	−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	$12,475,815
HXL	Hexcel Corp	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
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
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
MANH	Manhattan Associates Inc	30,580	$4,070,809
IQV	Iqvia Holdings Inc.	22,580	$3,850,793
BELFB	Bel Fuse Inc	16,311	$3,229,251
IRTC	iRhythm Holdings, Inc.	27,193	$3,209,317
COIN	Coinbase Global, Inc.	17,630	$3,078,374
EYE	National Vision Holdings, Inc.	117,736	$3,049,362
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

309 tracked positions · $3,713,497,280 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 309 positions by value · page 1 of 7

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	Held (qtrs)	Est. cost/share	% of Portfolio
NVDA	Nvidia Corp Technology	Added	1,299,605	+41,593	$260,037,964	+18.5%	26+	before history	7.00%
GOOGL	Alphabet Inc. Communication Services	Added	507,093	+89,074	$181,219,825	+50.8%	26+	before history	4.88%
AAPL	Apple Inc. Technology	Added	472,108	+122,097	$136,609,170	+53.8%	26+	before history	3.68%
LRCX	Lam Research Corp Technology	Reduced	283,808	-52,932	$122,982,520	+70.9%	26+	before history	3.31%
MSFT	Microsoft Corp Technology	Added	292,770	+28,668	$109,209,065	+11.7%	26+	before history	2.94%
LLY	ELI LILLY & Co Healthcare	Added	87,697	+14,219	$105,186,421	+55.6%	24	$749.46	2.83%
AVGO	Broadcom Inc. Technology	Added	243,896	+41,192	$92,131,714	+46.8%	4	$322.69	2.48%
SPIB	State Street(R) SPDR(R) Portfolio Intermediate Term Corporate Bond ETF	Held	2,688,380	0	$89,953,194	−0.2%	7	$33.15	2.42%
V	Visa Inc. Financial Services	Added	236,166	+82,340	$81,026,192	+74.3%	26+	before history	2.18%
ANET	Arista Networks, Inc. Technology	Added	473,319	+42,384	$80,407,431	+52.0%	7	unpriced	2.17%
GOVT	iShares U.S. Treasury Bond ETF	Held	3,329,569	0	$75,847,581	−0.6%	7	unpriced	2.04%
VMBS	VANGUARD MORTGAGE-BACKED SECURITIES INDEX FUND	Held	1,487,800	0	$69,643,918	−0.3%	7	$45.97	1.88%
AMD	Advanced Micro Devices Inc Technology	Added	118,865	+29,911	$69,049,867	+281.6%	3	$271.25	1.86%
GILD	Gilead Sciences, Inc. Healthcare	Added	527,542	+185,392	$66,649,656	+39.8%	26+	before history	1.79%
AMZN	Amazon Com Inc Consumer Cyclical	Added	268,249	+22,388	$63,934,466	+24.9%	26+	before history	1.72%
GEV	GE Vernova Inc. Industrials	Added	46,101	+4,612	$54,162,220	+49.6%	5	$629.97	1.46%
META	Meta Platforms, Inc. Communication Services	Reduced	93,744	-30,221	$52,805,057	−25.5%	26+	before history	1.42%
ADI	Analog Devices Inc Technology	Added	120,934	+43,026	$48,031,356	+93.8%	4	$306.62	1.29%
MA	Mastercard Inc Financial Services	Reduced	91,462	-551	$46,974,883	+2.2%	26+	before history	1.26%
MS	Morgan Stanley Financial Services	Added	208,542	+184,862	$43,593,619	+1018.6%	8	$188.64	1.17%
SNOW	Snowflake Inc. Technology	Added	166,818	+30,774	$42,455,181	+106.9%	5	$182.44	1.14%
VRT	Vertiv Holdings Co Industrials	Added	123,901	+11,538	$41,484,532	+47.3%	4	$151.25	1.12%
TPR	Tapestry, Inc. Consumer Cyclical	Added	265,749	+61,279	$38,900,338	+34.8%	3	$127.43	1.05%
		Held	1,334,080	0	$38,701,660	−0.6%	7	$29.13	1.04%
		Held	448,330	0	$33,736,832	+0.7%	5	$74.88	0.91%
NOW	ServiceNow, Inc. Technology	Added	321,623	+17,867	$31,930,731	+0.5%	16	unpriced	0.86%
TLH	iShares 10-20 Year Treasury Bond ETF	Held	258,432	0	$25,933,651	−0.4%	7	unpriced	0.70%
BKNG	Booking Holdings Inc. Consumer Cyclical	Added	136,776	+131,880	$24,378,954	+18.3%	5	unpriced	0.66%
MCO	Moodys Corp Financial Services	Added	53,444	+36,544	$24,205,856	+228.3%	2	$456.67	0.65%
TSLA	Tesla, Inc. Consumer Cyclical	Added	48,070	+8,890	$20,218,242	+38.8%	26+	before history	0.54%
CAT	Caterpillar Inc Industrials	Added	18,980	+5,060	$20,211,802	+105.0%	4	$547.30	0.54%
GE	General Electric Co Industrials	Added	52,830	+22,150	$19,744,155	+126.8%	6	$271.53	0.53%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Held	41,210	0	$19,680,659	+41.3%	26+	before history	0.53%
LGND	Ligand Pharmaceuticals Inc Healthcare	Added	62,043	+13,347	$19,611,171	+101.7%	4	$168.42	0.53%
SN	SharkNinja, Inc. Consumer Cyclical	NEW	127,170	NEW	$19,364,175	NEW	1	$119.77	0.52%
MBB	iShares MBS ETF	Held	204,235	0	$19,304,292	−0.5%	7	unpriced	0.52%
TWLO	Twilio Inc Technology	Added	92,390	+65,630	$19,062,828	+466.2%	2	$161.56	0.51%
BKR	Baker Hughes Co Energy	Reduced	330,020	-57,170	$18,316,110	−22.5%	7	$55.31	0.49%
GTX	Garrett Motion Inc. Consumer Cyclical	Reduced	469,470	-18,530	$17,008,898	+91.8%	3	$15.92	0.46%
JPM	Jpmorgan Chase & Co Financial Services	Held	50,525	0	$16,538,348	+11.3%	13	$244.98	0.45%
ASND	Ascendis Pharma A/S Healthcare	Reduced	61,696	-5,920	$16,455,557	+6.4%	4	$194.24	0.44%
JBHT	Hunt J B Transport Services Inc Industrials	Added	56,520	+33,920	$16,358,583	+241.6%	26+	before history	0.44%
FANG	Diamondback Energy, Inc. Energy	Reduced	90,680	-54,340	$15,939,730	−44.4%	2	$169.93	0.43%
GM	General Motors Co Consumer Cyclical	Added	199,440	+100,160	$15,372,835	+107.8%	3	$74.55	0.41%
BTSG	BrightSpring Health Services, Inc. Healthcare	Reduced	212,430	-34,770	$14,814,868	+40.6%	3	$35.96	0.40%
SMTC	Semtech Corp Technology	Reduced	91,218	-16,540	$14,763,633	+78.2%	4	$62.85	0.40%
FCFS	FirstCash Holdings, Inc. Financial Services	Reduced	68,190	-2,540	$14,750,860	+10.9%	3	$160.70	0.40%
MAR	Marriott International Inc Consumer Cyclical	Added	37,910	+29,550	$14,049,066	+413.8%	3	$350.45	0.38%
IGIB	iShares 5-10 Year Investment Grade Corporate Bond ETF	Held	259,994	0	$13,823,880	−0.1%	7	unpriced	0.37%
TJX	Tjx Companies Inc Consumer Cyclical	Held	90,620	0	$13,728,930	−5.1%	26+	before history	0.37%

Showing the top 50 of 309 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

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.