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Castleark Management LLC

13F for June 30, 2026, filed August 14, 2026 · SEC CIK 1106832 · Holdings history from December 31, 1999

Reported value
$3.7bn
88% in companies we cover
Positions we cover
268
Largest NVDA 7.0%
Copy, a year
+12.0%
S&P 500 +11.7%
Copy Sharpe ratio
0.57
S&P 500 0.62

Copy-performance statistics: February 22, 2008 to November 2, 2026. Holdings history can start earlier than the price data used for performance.

Historical holdings

Holdings across the available history, including securities outside our stock coverage. Select a date to view the holdings for that period.

Related reporting managers

SEC notices identify these reporting relationships. Each manager retains its own holdings history; changes in reporting scope can involve several managers.

309 reported entries for June 30, 2026.

IssuerClass / typeReported valueQuantity
WESCO INTL INC95082P105 · WCC COM $9.4m 27,347
WESTERN MIDSTREAM PARTNERS L958669103 · WES COM UNIT LP INT $585,946 13,390
WILLIAMS COS INC969457100 · WMB COM $9.8m 131,770
WILLSCOT HLDGS CORP971378104 · WSC COM CL A $9.4m 325,950
WOODWARD INC980745103 · WWD COM $1.2m 2,720
WYNDHAM HOTELS & RESORTS INC98311A105 · WH COM $6.1m 72,400
XPO INC983793100 · XPO COM $11.7m 57,079
XENON PHARMACEUTICALS INC98420N105 · XENE COM $3.7m 61,763
XOMETRY INC98423F109 · XMTR CLASS A COM $11.3m 117,518

Values use the units disclosed in the source. Where a dollar scale cannot be established, the original amount is shown as filed. Rows may include separate allocations, options and principal amounts; these are kept separate from the covered-stock portfolio used for performance.

How copying its 13F would have done

$5.0k$10.0k$20.0k$40.0k$80.0k 2008201020122014201620182020202220242026 $83.8k$78.5k
CopyS&P 500 $10,000 copying Castleark Management LLC's usable filed holdings in companies we cover from February 22, 2008, rebalancing at the first weekly close after each usable filing and holding until the next, against the S&P 500 (total return). Missing prices carry their last observed value. Marked weekly, log scale. Before costs and taxes; misses trading within each quarter and anything 13F does not show (shorts, cash, bonds, non-US holdings).

Biggest drop −56.8% (S&P 500 −50.8%); beta 1.12; alpha −0.3% a year (t = −0.22); last 12 months +8.3% against +12.1%.

Reported value by quarter

Castleark Management LLC: 13F reported value Total reported value where the source's dollar units can be established. Earlier filings in thousands of dollars are converted; dates with unresolved value units are omitted.
$0 $2B $4B $6B Reported value, 2000-09-30: $785M Reported value, 2008-03-31: $1.9B Reported value, 2008-06-30: $2B Reported value, 2008-09-30: $1.5B Reported value, 2008-12-31: $1.2B Reported value, 2009-03-31: $1.3B Reported value, 2009-06-30: $1.6B Reported value, 2013-06-30: $3B Reported value, 2013-09-30: $3.5B Reported value, 2013-12-31: $3.4B Reported value, 2014-03-31: $3.5B Reported value, 2014-06-30: $3.6B Reported value, 2014-09-30: $3.5B Reported value, 2014-12-31: $3.9B Reported value, 2015-03-31: $4.1B Reported value, 2015-06-30: $3.7B Reported value, 2015-09-30: $3.1B Reported value, 2015-12-31: $3.3B Reported value, 2016-03-31: $3.2B Reported value, 2016-06-30: $3.1B Reported value, 2016-09-30: $3.3B Reported value, 2016-12-31: $3.1B Reported value, 2017-03-31: $3.2B Reported value, 2017-06-30: $3.1B Reported value, 2017-09-30: $3.2B Reported value, 2017-12-31: $3.3B Reported value, 2018-03-31: $3.2B Reported value, 2018-06-30: $3.2B Reported value, 2018-09-30: $3.5B Reported value, 2018-12-31: $2.3B Reported value, 2019-03-31: $2.7B Reported value, 2019-06-30: $2.6B Reported value, 2019-09-30: $2.5B Reported value, 2019-12-31: $2.5B Reported value, 2020-03-31: $1.7B Reported value, 2020-06-30: $2.3B Reported value, 2020-09-30: $2.6B Reported value, 2020-12-31: $2.7B Reported value, 2021-03-31: $2.8B Reported value, 2021-06-30: $3B Reported value, 2021-09-30: $2.6B Reported value, 2021-12-31: $2.7B Reported value, 2022-03-31: $2.3B Reported value, 2022-06-30: $1.9B Reported value, 2022-09-30: $1.8B Reported value, 2022-12-31: $1.9B Reported value, 2023-03-31: $2B Reported value, 2023-06-30: $2.2B Reported value, 2023-09-30: $2B Reported value, 2023-12-31: $2.3B Reported value, 2024-03-31: $2.4B Reported value, 2024-06-30: $2.4B Reported value, 2024-09-30: $2.5B Reported value, 2024-12-31: $2.9B Reported value, 2025-03-31: $2.9B Reported value, 2025-06-30: $3.3B Reported value, 2025-09-30: $3.6B Reported value, 2025-12-31: $3.4B Reported value, 2026-03-31: $3B Reported value, 2026-06-30: $3.7B 2000-09-30 2014-09-30 2017-09-30 2020-09-30 2023-09-30 2026-06-30 $3.7B
View chart data
Period Reported value
2000-09-30 $785M
2008-03-31 $1.9B
2008-06-30 $2B
2008-09-30 $1.5B
2008-12-31 $1.2B
2009-03-31 $1.3B
2009-06-30 $1.6B
2013-06-30 $3B
2013-09-30 $3.5B
2013-12-31 $3.4B
2014-03-31 $3.5B
2014-06-30 $3.6B
2014-09-30 $3.5B
2014-12-31 $3.9B
2015-03-31 $4.1B
2015-06-30 $3.7B
2015-09-30 $3.1B
2015-12-31 $3.3B
2016-03-31 $3.2B
2016-06-30 $3.1B
2016-09-30 $3.3B
2016-12-31 $3.1B
2017-03-31 $3.2B
2017-06-30 $3.1B
2017-09-30 $3.2B
2017-12-31 $3.3B
2018-03-31 $3.2B
2018-06-30 $3.2B
2018-09-30 $3.5B
2018-12-31 $2.3B
2019-03-31 $2.7B
2019-06-30 $2.6B
2019-09-30 $2.5B
2019-12-31 $2.5B
2020-03-31 $1.7B
2020-06-30 $2.3B
2020-09-30 $2.6B
2020-12-31 $2.7B
2021-03-31 $2.8B
2021-06-30 $3B
2021-09-30 $2.6B
2021-12-31 $2.7B
2022-03-31 $2.3B
2022-06-30 $1.9B
2022-09-30 $1.8B
2022-12-31 $1.9B
2023-03-31 $2B
2023-06-30 $2.2B
2023-09-30 $2B
2023-12-31 $2.3B
2024-03-31 $2.4B
2024-06-30 $2.4B
2024-09-30 $2.5B
2024-12-31 $2.9B
2025-03-31 $2.9B
2025-06-30 $3.3B
2025-09-30 $3.6B
2025-12-31 $3.4B
2026-03-31 $3B
2026-06-30 $3.7B

Latest covered holdings and moves

Covered holdings as of June 30, 2026.

CompanyShare of portfolioValueSharesChange in shares
NVDANVIDIA Corporation7.01%$260.0m1.30M+3.3% Added
GOOGLAlphabet Inc. (Class A)4.89%$181.2m507.1K+21.3% Added
AAPLApple Inc.3.68%$136.6m472.1K+34.9% Added
LRCXLam Research3.31%$123.0m283.8K−15.7% Reduced
MSFTMicrosoft Corporation2.94%$109.2m292.8K+10.9% Added
LLYLilly (Eli)2.84%$105.2m87.7K+19.4% Added
AVGOBroadcom2.48%$92.1m243.9K+20.3% Added
VVisa Inc.2.18%$81.0m236.2K+53.5% Added
ANETArista Networks2.17%$80.4m473.3K+9.8% Added
AMDAdvanced Micro Devices1.86%$69.0m118.9K+33.6% Added
GILDGilead Sciences1.80%$66.6m527.5K+54.2% Added
AMZNAmazon1.72%$63.9m268.2K+9.1% Added
GEVGE Vernova1.46%$54.2m46.1K+11.1% Added
METAMeta Platforms1.42%$52.8m93.7K−24.4% Reduced
ADIAnalog Devices1.29%$48.0m120.9K+55.2% Added
MAMastercard1.27%$47.0m91.5K−0.6% Reduced
MSMorgan Stanley1.18%$43.6m208.5K+780.7% Added
SNOWSnowflake Inc.1.15%$42.5m166.8K+22.6% Added
VRTVertiv1.12%$41.5m123.9K+10.3% Added
TPRTapestry, Inc.1.05%$38.9m265.7K+30.0% Added
NOWServiceNow0.86%$31.9m321.6K+5.9% Added
BKNGBooking Holdings0.66%$24.4m136.8K+2693.6% Added
MCOMoody's Corporation0.65%$24.2m53.4K+216.2% Added
TSLATesla, Inc.0.55%$20.2m48.1K+22.7% Added
CATCaterpillar Inc.0.55%$20.2m19.0K+36.4% Added
GEGE Aerospace0.53%$19.7m52.8K+72.2% Added
TSMTaiwan Semiconductor Manufacturing Co LTD0.53%$19.7m41.2K0.0%
LGNDLigand Pharmaceuticals Inc0.53%$19.6m62.0K+27.4% Added
SNSharkninja, Inc.0.52%$19.4m127.2KNew
TWLOTwilio Inc0.51%$19.1m92.4K+245.3% Added
BKRBaker Hughes0.49%$18.3m330.0K−14.8% Reduced
GTXGarrett Motion Inc.0.46%$17.0m469.5K−3.8% Reduced
JPMJPMorgan Chase0.45%$16.5m50.5K0.0%
ASNDAscendis Pharma A/s0.44%$16.5m61.7K−8.8% Reduced
JBHTJ.B. Hunt0.44%$16.4m56.5K+150.1% Added
FANGDiamondback Energy0.43%$15.9m90.7K−37.5% Reduced
GMGeneral Motors0.41%$15.4m199.4K+100.9% Added
BTSGBrightspring Health Services, Inc.0.40%$14.8m212.4K−14.1% Reduced
SMTCSemtech Corp0.40%$14.8m91.2K−15.3% Reduced
FCFSFirstcash Holdings, Inc.0.40%$14.8m68.2K−3.6% Reduced
MARMarriott International0.38%$14.0m37.9K+353.5% Added
TJXTJX Companies0.37%$13.7m90.6K0.0%
UBERUber0.37%$13.7m189.4K+11.5% Added
UCTTUltra Clean Holdings, Inc.0.37%$13.7m95.8K−4.4% Reduced
NOVTNovanta Inc0.36%$13.5m83.2K+137.8% Added
AXONAxon Enterprise0.35%$13.1m23.4K+164.3% Added
BABoeing0.35%$12.9m59.5K+128.2% Added
ESIElement Solutions Inc0.34%$12.6m263.6K−3.7% Reduced
MYRGMYR Group Inc.0.34%$12.5m24.9K+41.9% Added
GHGuardant Health, Inc.0.33%$12.0m80.3K−49.9% Reduced
FROGJfrog Ltd0.32%$11.8m129.5K+39.5% Added
CCitigroup0.32%$11.7m83.7K+76.3% Added
XPOXPO, Inc.0.32%$11.7m57.1K+120.8% Added
KLICKulicke & Soffa Industries Inc0.31%$11.6m87.0K−18.3% Reduced
HQYHealthequity, Inc.0.31%$11.5m127.8K+163.4% Added
XMTRXometry, Inc.0.31%$11.3m117.5K+114.6% Added
LSCCLattice Semiconductor Corp0.30%$11.3m74.0K−19.3% Reduced
JAZZJazz Pharmaceuticals plc0.30%$11.3m46.9K−3.7% Reduced
HLIOHelios Technologies, Inc.0.30%$11.2m125.4K−21.8% Reduced
KNSAKiniksa Pharmaceuticals International, plc0.30%$11.1m174.0K−4.1% Reduced
ESEEsco Technologies Inc0.30%$11.1m31.6K+76.9% Added
VSECVSE Corp0.30%$11.0m48.2K−3.7% Reduced
TKRTimken Co0.29%$11.0m75.4K+86.7% Added
HXLHexcel Corp0.29%$10.6m106.0KNew
BWABorgwarner Inc0.28%$10.5m158.7K+6.9% Added
AIRAAR Corp0.28%$10.5m73.7K+22.2% Added
WMTWalmart0.28%$10.4m91.6K−19.2% Reduced
CROXCrocs, Inc.0.28%$10.4m85.8KNew
EQTEQT Corporation0.28%$10.3m193.8K0.0%
SXTSensient Technologies Corp0.28%$10.2m82.9KNew
MXLMaxlinear, Inc0.28%$10.2m79.8KNew
SEISolaris Energy Infrastructure, Inc.0.27%$10.1m125.8K+33.5% Added
EVREvercore Inc.0.27%$10.0m29.3K−3.8% Reduced
SHOPShopify Inc.0.27%$10.0m87.2K−71.9% Reduced
ALGMAllegro Microsystems, Inc.0.27%$9.9m141.9K−3.7% Reduced
ULSUL Solutions Inc.0.27%$9.9m96.8KNew
WMBWilliams Companies0.26%$9.8m131.8K0.0%
CWSTCasella Waste Systems Inc0.26%$9.7m100.5KNew
CDNLCardinal Infrastructure Group Inc.0.26%$9.7m103.0KNew
SOLSSolstice Advanced Materials Inc.0.26%$9.7m109.0K−3.6% Reduced
DYDycom Industries Inc0.26%$9.5m18.8K−42.1% Reduced
RALRalliant Corp0.26%$9.5m128.7KNew
WCCWesco International Inc0.26%$9.4m27.3K−3.7% Reduced
WSCWillscot Holdings Corp0.25%$9.4m325.9KNew
KNXKnight-swift Transportation Holdings Inc.0.25%$9.4m120.6K−4.3% Reduced
LTHLife Time Group Holdings, Inc.0.25%$9.4m229.3KNew
CGNXCognex Corp0.25%$9.3m128.7K+16.8% Added
AXPAmerican Express0.25%$9.2m27.3K+920.4% Added
ASBAssociated Banc-corp0.25%$9.2m299.4K−3.9% Reduced
BKDBrookdale Senior Living Inc.0.25%$9.2m570.1K−4.7% Reduced
MUMicron Technology0.25%$9.1m7.9K−28.1% Reduced
GWWW. W. Grainger0.24%$9.0m6.6K+17.8% Added
OPLNOpenlane, Inc.0.24%$9.0m217.2KNew
RIGTransocean Ltd.0.24%$8.9m1.81M+116.6% Added
ELANElanco Animal Health Inc0.24%$8.8m358.9K+0.8% Added
WULFTerawulf Inc.0.23%$8.7m353.1KNew
ENVAEnova International, Inc.0.23%$8.7m36.1K−3.7% Reduced
INTCIntel0.23%$8.6m61.6KNew
RUSHARush Enterprises Inc \tx\0.22%$8.3m114.0KNew
TGTXTG Therapeutics, Inc.0.22%$8.3m151.0KNew
FASTFastenal0.22%$8.2m171.4K+15.3% Added
CRLCharles River Laboratories0.22%$8.2m36.0K−8.6% Reduced
PRAXPraxis Precision Medicines, Inc.0.22%$8.2m24.4KNew
FFIVF5, Inc.0.22%$8.1m19.6K+13864.3% Added
LINCLincoln Educational Services Corp0.22%$8.1m162.9K+8.2% Added
BRKRBruker Corp0.22%$8.1m134.3KNew
CFCF Industries0.21%$8.0m73.6K−43.0% Reduced
LBRTLiberty Energy Inc.0.21%$7.8m296.6K+12.0% Added
MOHMolina Healthcare, Inc.0.21%$7.7m33.8KNew
RRCRange Resources Corp0.21%$7.6m205.3K−50.0% Reduced
PENNPenn Entertainment, Inc.0.20%$7.5m351.9KNew
MODModine Manufacturing Co0.20%$7.5m28.0K−26.1% Reduced
HHyatt Hotels Corp0.20%$7.4m38.1K+114.2% Added
PLPlanet Labs PBC0.20%$7.3m221.4K−22.5% Reduced
ALSNAllison Transmission Holdings Inc0.20%$7.3m64.9K+28.2% Added
PAYPaymentus Holdings, Inc.0.19%$7.2m298.5K+10.3% Added
MUSAMurphy USA Inc.0.19%$7.2m13.3K+23.3% Added
PLXSPlexus Corp0.19%$7.1m23.8K−3.8% Reduced
TXRHTexas Roadhouse, Inc.0.19%$7.1m36.5K−11.9% Reduced
HRIHerc Holdings Inc0.19%$7.0m48.5KNew
MSMMSC Industrial Direct Co Inc0.19%$6.9m58.3KNew
SFStifel Financial Corp0.18%$6.9m98.2K−3.7% Reduced
CAVACAVA Group, Inc.0.18%$6.8m86.4KNew
DGXQuest Diagnostics0.18%$6.7m31.5KNew
APGApi Group Corp0.17%$6.5m152.8K−23.7% Reduced
LNGCheniere Energy, Inc.0.17%$6.3m26.5K+10.1% Added
RRXRegal Rexnord Corp0.17%$6.3m26.3K+35.8% Added
QXOQXO, Inc.0.17%$6.3m362.3K−3.6% Reduced
PTGXProtagonist Therapeutics, Inc0.17%$6.2m50.6KNew
AAONAAON, Inc.0.17%$6.2m48.7KNew
CTRICenturi Holdings, Inc.0.17%$6.2m203.8KNew
JHXJames Hardie Industries plc0.17%$6.1m233.8KNew
WHWyndham Hotels & Resorts, Inc.0.16%$6.1m72.4K−3.7% Reduced
AEISAdvanced Energy Industries Inc0.16%$6.0m16.2K−65.3% Reduced
KRYSKrystal Biotech, Inc.0.16%$6.0m16.1K−48.9% Reduced
BBIOBridgebio Pharma, Inc.0.16%$5.8m78.5K−4.0% Reduced
TEXTerex Corp0.16%$5.8m79.9K+6.1% Added
TRGPTarga Resources0.15%$5.8m21.5K0.0%
COCOVita Coco Company, Inc.0.15%$5.8m87.0K−10.9% Reduced
MPCMarathon Petroleum0.15%$5.7m22.4K0.0%
HOODRobinhood Markets0.15%$5.7m56.7K+12.7% Added
EXEExpand Energy0.15%$5.6m61.2K0.0%
DOCNDigitalocean Holdings, Inc.0.15%$5.6m35.5K−80.5% Reduced
AXSMAxsome Therapeutics, Inc.0.15%$5.4m22.1K−3.9% Reduced
TTMITTM Technologies Inc0.14%$5.3m28.1K−69.2% Reduced
SXIStandex International Corp0.14%$5.2m14.5KNew
SJMThe J.M. Smucker Company0.14%$5.1m45.2K−24.2% Reduced
PRPermian Resources Corp0.13%$5.0m270.9K−57.1% Reduced
GENIGenius Sports Ltd0.13%$4.9m806.8KNew
BCBrunswick Corp0.13%$4.8m56.7K−28.3% Reduced
CompanyBought (value)Shares
MSMorgan Stanley$38.6m184.9K
AAPLApple Inc.$35.3m122.1K
GOOGLAlphabet Inc. (Class A)$31.8m89.1K
VVisa Inc.$28.3m82.3K
BKNGBooking Holdings$23.5m131.9K
GILDGilead Sciences$23.4m185.4K
SNSharkninja, Inc.$19.4m127.2K
AMDAdvanced Micro Devices$17.4m29.9K
ADIAnalog Devices$17.1m43.0K
LLYLilly (Eli)$17.1m14.2K
MCOMoody's Corporation$16.6m36.5K
AVGOBroadcom$15.6m41.2K
TWLOTwilio Inc$13.5m65.6K
MARMarriott International$11.0m29.6K
MSFTMicrosoft Corporation$10.7m28.7K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanySold (value)Shares
SCHWCharles Schwab Corporation−$45.6m−494.7K
ULTAUlta Beauty−$26.5m−50.6K
SHOPShopify Inc.−$25.5m−223.4K
DOCNDigitalocean Holdings, Inc.−$23.0m−146.7K
LRCXLam Research−$22.9m−52.9K
CVXChevron Corporation−$20.7m−124.7K
VIAVViavi Solutions Inc.−$17.1m−358.6K
METAMeta Platforms−$17.0m−30.2K
BEBloom Energy−$16.2m−53.6K
STRLSterling Infrastructure, Inc.−$15.6m−18.6K
MCHPMicrochip Technology Inc−$15.6m−170.9K
TSEMTower Semiconductor LTD−$12.9m−49.6K
GHGuardant Health, Inc.−$12.0m−80.0K
TTMITTM Technologies Inc−$11.8m−63.1K
NXTNextpower Inc.−$11.5m−96.7K

Change in shares on the previous quarter's 13F, valued at this quarter's reported price.

CompanyValue last quarterShares
ULTAUlta Beauty$26.5m50.6K
FIVEFive Below, Inc$9.2m40.1K
TPCTutor Perini Corp$9.0m116.4K
HASHasbro$8.9m94.7K
SPXCSPX Technologies, Inc.$8.3m41.6K
PAHCPhibro Animal Health Corp$7.9m142.9K
KTOSKratos Defense & Security Solutions, Inc.$7.7m109.6K
ADSKAutodesk, Inc.$7.6m31.9K
IPGPIPG Photonics Corp$6.9m60.5K
PATKPatrick Industries Inc$6.9m62.2K
ATMUAtmus Filtration Technologies Inc.$6.8m119.3K
SSDSimpson Manufacturing Co., Inc.$6.6m38.4K
CHDNChurchill Downs Inc$6.1m67.8K
IDCCInterdigital, Inc.$6.0m19.9K
ONTOOnto Innovation Inc.$6.0m29.0K
FSLYFastly, Inc.$5.2m177.7K
MEDPMedpace Holdings, Inc.$4.8m10.0K
RYTMRhythm Pharmaceuticals, Inc.$4.5m52.3K
FFord Motor Company$4.4m380.2K
MANHManhattan Associates Inc$4.1m30.6K
IQVIQVIA$3.9m22.6K
BELFABEL Fuse Inc$3.2m16.3K
IRTCIrhythm Holdings, Inc.$3.2m27.2K
COINCoinbase$3.1m17.6K
EYENational Vision Holdings, Inc.$3.0m117.7K
FIGSFigs, Inc.$2.9m199.0K
URIUnited Rentals$2.5m3.4K
CELHCelsius Holdings, Inc.$2.4m67.9K
CDECoeur Mining, Inc.$2.3m122.9K
AAOIApplied Optoelectronics, Inc.$2.2m25.7K
  • Technology38.9%
  • Industrials15.4%
  • Health Care11.8%
  • Consumer Discretionary10.1%
  • Financials9.1%
  • Communication Services7.3%
  • Energy4.9%
  • Materials1.5%
  • Consumer Staples0.8%
  • Utilities0.2%
  • Real Estate0.0%

Share of the value held in companies we cover, by sector.

PeriodCopy, a yearS&P 500SharpeS&P 500Biggest dropBeta
Whole backtestFebruary 22, 2008 to November 2, 2026+12.0%+11.7%0.570.62−56.8%1.12
2010 to 2017January 8, 2010 to December 29, 2017+15.1%+13.5%0.950.98−18.9%1.12
2018 onwardsJanuary 5, 2018 to November 2, 2026+13.6%+13.9%0.560.66−35.8%1.19
Last three yearsNovember 3, 2023 to November 2, 2026+20.5%+21.8%0.861.16−24.0%1.28
Last yearNovember 7, 2025 to November 2, 2026+10.9%+14.2%0.490.84−10.5%1.24

From SEC Form 13F data sets. A 13F lists long positions in US-listed shares at the quarter's end, filed up to 45 days later; it does not show shorts, cash, bonds, non-US holdings or trades within the quarter. Positions in companies outside our coverage are not listed here. Research, not investment advice.