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Institutional

CASTLEARK MANAGEMENT LLC

CIK 0001106832
$3.02B
Reported AUM
292
Positions
Q1 2026
Period
2026-05-15
Filed

The Brief · CASTLEARK MANAGEMENT LLC · Q1 2026

AI · grounded in 13F

CASTLEARK MANAGEMENT LLC closed its position in BX for a reduction of $37.65M. The fund also exited positions in EFA and PODD, while trimming holdings in AMZN by 47.93% and MSFT by 28.52%. On the buy side, the manager established new positions in FANG for $28.68M and CVX for $28.25M.

Portfolio · Q1 2026

NVDA$219.4MGOOGLMSFTSPIBAAPLGOVTLRCXMETAVMBSLLYAVGOOther$1.93BCL

Top holdings

#StockIssuerPriceDay %1Y Gr.5Y Gr.Value% of bookΔ shares (QoQ)Status
1NVDANVIDIA CORPORATION$190.01-3.55%13.56%782.99%$219.4M7.26%HELD
2GOOGLALPHABET INC$336.710.90%76.51%132.04%$120.2M3.98%HELD
3MSFTMICROSOFT CORP$390.54-0.71%-24.89%34.54%$97.8M3.23%HELD
4SPIBSPDR SERIES TRUST$33.13-0.12%2.58%7.86%$90.2M2.98%HELD
5AAPLAPPLE INC$338.19-0.56%67.77%128.17%$88.8M2.94%HELD
6GOVTISHARES TR$22.50-0.35%1.50%-4.07%$76.3M2.52%HELD
7LRCXLAM RESEARCH CORP$252.35-6.40%181.31%369.59%$71.9M2.38%HELD
8METAMETA PLATFORMS INC$585.61-1.31%-20.62%57.79%$70.9M2.35%HELD
9VMBSVANGUARD SCOTTSDALE FDS$46.19-0.39%4.01%2.03%$69.9M2.31%HELD
10LLYELI LILLY & CO$1210.02-0.87%61.25%393.83%$67.6M2.24%HELD
11AVGOBROADCOM INC$370.32-2.78%31.81%734.42%$62.7M2.08%HELD
12ANETARISTA NETWORKS INC$157.97-6.92%34.36%583.98%$52.9M1.75%HELD
13AMZNAMAZON COM INC$226.65-1.82%5.54%30.60%$51.2M1.69%HELD
14GILDGILEAD SCIENCES INC$132.73-1.18%21.77%121.51%$47.7M1.58%HELD
15SCHWSCHWAB CHARLES CORP$104.47-1.42%12.19%54.86%$47.4M1.57%HELD
16VVISA INC$368.730.58%9.62%67.02%$46.5M1.54%HELD
17MAMASTERCARD INCORPORATED$563.320.10%1.24%67.59%$46.0M1.52%HELD
18SPTSSPDR SERIES TRUST$28.970.07%2.69%9.86%$38.9M1.29%HELD
19SHOPSHOPIFY INC$129.17-0.85%8.91%-15.29%$36.8M1.22%HELD
20GEVGE VERNOVA INC$900.28-4.57%44.02%516.33%$36.2M1.20%HELD
21VCLTVANGUARD SCOTTSDALE FDS$72.01-1.11%1.04%-14.96%$33.5M1.11%HELD
22NOWSERVICENOW INC$115.764.65%-36.70%-10.07%$31.8M1.05%HELD
23TPRTAPESTRY INC$150.11-0.52%43.77%326.06%$28.9M0.95%HELD
24FANGDIAMONDBACK ENERGY INC$199.134.63%39.78%217.26%$28.7M0.95%HELD
25CVXCHEVRON CORPORATION$191.862.28%32.10%140.30%$28.3M0.93%HELD
26VRTVERTIV HOLDINGS CO$223.04-17.26%90.59%861.48%$28.2M0.93%HELD
27ULTAULTA BEAUTY INC$508.091.31%0.07%31.18%$26.5M0.88%HELD
28TLHISHARES TR$97.11-1.19%0.28%-22.86%$26.0M0.86%HELD
29ADIANALOG DEVICES INC$353.37-3.41%64.05%138.71%$24.8M0.82%HELD
30BKRBAKER HUGHES COMPANY$58.720.44%37.29%188.06%$23.6M0.78%HELD
31BKNGBOOKING HOLDINGS INC$201.301.00%$20.6M0.68%HELD
32SNOWSNOWFLAKE INC$282.904.64%$20.5M0.68%HELD
33MBBISHARES TR$93.23-0.47%$19.4M0.64%HELD
34RRCRANGE RES CORP$39.914.31%$18.5M0.61%HELD
35AMDADVANCED MICRO DEVICES INC$429.56-5.51%$18.1M0.60%HELD
36CFCF INDUSTRIES HOLD$127.353.60%$16.8M0.55%HELD
37DOCNDIGITALOCEAN HLDGS INC$106.76-5.11%$15.6M0.52%HELD
38ASNDUSDASCENDIS PHARMA A/S$15.5M0.51%HELD
39AEISADVANCED ENERGY INDS$252.49-7.65%$15.0M0.50%HELD
40JPMJPMORGAN CHASE & CO$344.71-3.53%$14.9M0.49%HELD
41GHGUARDANT HEALTH INC$144.070.31%$14.8M0.49%HELD
42TSLATESLA INC$298.32-2.97%$14.6M0.48%HELD
43TJXTJX COS INC NEW$161.630.52%$14.5M0.48%HELD
44WMTWALMART INC$114.220.99%$14.1M0.47%HELD
45TSMTAIWAN SEMICONDUCTOR MANUFAC$374.67-4.50%$13.9M0.46%HELD
46IGIBISHARES TR$52.27-0.34%$13.8M0.46%HELD
47NXTNEXTPOWER INC$92.67-2.81%$13.8M0.46%HELD
48PRPERMIAN RESOURCES CORP$20.755.17%$13.5M0.45%HELD
49FCFSFIRSTCASH HOLDINGS INC$202.22-2.18%$13.3M0.44%HELD
50MCHPMICROCHIP TECHNOLOGY INC.$71.37-5.73%$13.2M0.44%HELD
51VIAVVIAVI SOLUTIONS INC$32.23-8.18%$12.6M0.42%HELD
52EQTEQT CORP$52.571.76%$12.3M0.41%HELD
53UBERUBER TECHNOLOGIES INC$71.200.65%$12.2M0.40%HELD
54TLTISHARES TR$82.85-1.65%$11.9M0.39%HELD
55DYDYCOM INDS INC$371.92-7.45%$11.0M0.36%HELD
56XOMEXXON MOBIL CORP$156.752.42%$10.9M0.36%HELD
57BTSGBRIGHTSPRING HEALTH SVCS INC$69.37-4.26%$10.5M0.35%HELD
58HLIOHELIOS TECHNOLOGIES INC$74.83-3.31%$10.4M0.34%HELD
59XBISPDR SERIES TRUST$147.91-1.25%$10.3M0.34%HELD
60CATCATERPILLAR INC$782.71-6.91%$9.9M0.33%HELD
61LGNDLIGAND PHARMACEUTICALS INC$288.01-2.79%$9.7M0.32%HELD
62WMBWILLIAMS COS INC$70.13-0.04%$9.6M0.32%HELD
63ESIELEMENT SOLUTIONS INC$34.79-4.68%$9.4M0.31%HELD
64FTITECHNIPFMC PLC$71.73-0.91%$9.3M0.31%HELD
65TSEMTOWER SEMICONDUCTOR LTD$187.84-7.46%$9.3M0.31%HELD
66VSECVSE CORP$184.98-7.20%$9.2M0.31%HELD
67JAZZJAZZ PHARMACEUTICALS PLC$255.97-0.37%$9.2M0.30%HELD
68FIVEFIVE BELOW INC$209.490.72%$9.2M0.30%HELD
69EVREVERCORE INC$304.71-10.51%$9.1M0.30%HELD
70TPCTUTOR PERINI CORP$76.68-6.46%$9.0M0.30%HELD
71TTMITTM TECHNOLOGIES INC$101.77-6.37%$8.9M0.29%HELD
72GTXGARRETT MOTION INC$28.78-3.81%$8.9M0.29%HELD
73HASHASBRO INC$95.17-1.21%$8.9M0.29%HELD
74KNSAKINIKSA PHARMACEUTICALS INTL$80.921.86%$8.7M0.29%HELD
75GEGE AEROSPACE$350.63-3.56%$8.7M0.29%HELD
76STRLSTERLING INFRASTRUCTURE INC$494.24-8.15%$8.6M0.29%HELD
77SOLSSOLSTICE ADVANCED MATLS INC$55.66-2.88%$8.6M0.28%HELD
78ELANELANCO ANIMAL HEALTH INC$26.393.41%$8.5M0.28%HELD
79LSCCLATTICE SEMICONDUCTOR CORP$112.96-5.91%$8.5M0.28%HELD
80GOOGALPHABET INC$335.760.95%$8.5M0.28%HELD
81SPXCSPX TECHNOLOGIES INC$187.65-8.14%$8.3M0.27%HELD
82SMTCSEMTECH CORP$103.55-6.96%$8.3M0.27%HELD
83XOPSPDR SERIES TRUST$172.043.41%$8.2M0.27%HELD
84XLVSELECT SECTOR SPDR TR$166.24-0.61%$8.2M0.27%HELD
85MODMODINE MFG CO$178.04-14.43%$8.2M0.27%HELD
86BKDBROOKDALE SR LIVING INC$14.86-3.32%$8.2M0.27%HELD
87KRYSKRYSTAL BIOTECH INC$363.28-0.26%$8.2M0.27%HELD
88APGAPI GROUP CORP$38.45-2.24%$8.1M0.27%HELD
89BWABORGWARNER INC$62.20-1.60%$8.1M0.27%HELD
90ASBASSOCIATED BANC-CORP$30.72-1.09%$8.1M0.27%HELD
91PLPLANET LABS PBC$19.47-4.65%$8.0M0.26%HELD
92ACAARCOSA INC$144.87-0.28%$7.9M0.26%HELD
93PAHCPHIBRO ANIMAL HEALTH CORP$36.951.59%$7.9M0.26%HELD
94WCCWESCO INTL INC$309.36-6.44%$7.8M0.26%HELD
95KTOSKRATOS DEFENSE & SEC SOLUTIO$43.88-9.79%$7.7M0.26%HELD
96ADSKAUTODESK INC$245.253.32%$7.6M0.25%HELD
97LBRTLIBERTY ENERGY INC$17.09-3.45%$7.6M0.25%HELD
98SFSTIFEL FINL CORP$81.92-3.21%$7.5M0.25%HELD
99BEBLOOM ENERGY CORP$163.75-1.85%$7.5M0.25%HELD
100GMGENERAL MTRS CO$89.40-1.00%$7.4M0.24%HELD
101MCOMOODYS CORP$7.4M0.24%HELD
102QXOQXO INC$7.3M0.24%HELD
103KNXKNIGHT-SWIFT TRANSN HLDGS IN$7.3M0.24%HELD
104TOLTOLL BROTHERS INC$7.0M0.23%HELD
105KLICKULICKE & SOFFA INDS INC$7.0M0.23%HELD
106GLDSPDR GOLD TR$7.0M0.23%HELD
107IPGPIPG PHOTONICS CORP$6.9M0.23%HELD
108ARQTARCUTIS BIOTHERAPEUTICS INC$6.9M0.23%HELD
109PATKPATRICK INDS INC$6.9M0.23%HELD
110FASTFASTENAL CO$6.9M0.23%HELD
111PAYPAYMENTUS HOLDINGS INC$6.9M0.23%HELD
112TXRHTEXAS ROADHOUSE INC$6.8M0.23%HELD
113LNGCHENIERE ENERGY INC$6.8M0.23%HELD
114CRLCHARLES RIV LABS INTL INC$6.8M0.23%HELD
115ATMUATMUS FILTRATION TECHNOLOGIE$6.8M0.22%HELD
116EXEEXPAND ENERGY CORPORATION$6.7M0.22%HELD
117ODFLOLD DOMINION FREIGHT LINE IN$6.6M0.22%HELD
118AIRAAR CORP$6.6M0.22%HELD
119SSDSIMPSON MFG INC$6.6M0.22%HELD
120PTCTPTC THERAPEUTICS INC$6.3M0.21%HELD
121UCTTULTRA CLEAN HLDGS INC$6.2M0.21%HELD
122SITMSITIME CORP$6.1M0.20%HELD
123LINCLINCOLN EDL SVCS CORP$6.1M0.20%HELD
124GWWWW GRAINGER INC$6.1M0.20%HELD
125WHWYNDHAM HOTELS & RESORTS INC$6.1M0.20%HELD
126CHDNCHURCHILL DOWNS INC$6.1M0.20%HELD
127BBIOBRIDGEBIO PHARMA INC$6.1M0.20%HELD
128IDCCINTERDIGITAL INC$6.0M0.20%HELD
129EUADSPINNAKER ETF SERIES$6.0M0.20%HELD
130ONTOONTO INNOVATION INC$6.0M0.20%HELD
131ALSNALLISON TRANSMISSION HLDGS I$5.9M0.20%HELD
132BCBRUNSWICK CORP$5.8M0.19%HELD
133SJMSMUCKER J M CO$5.7M0.19%HELD
134RIGTRANSOCEAN LTD$5.6M0.18%HELD
135MPCMARATHON PETE CORP$5.5M0.18%HELD
136CGNXCOGNEX CORP$5.4M0.18%HELD
137TRGPTARGA RES CORP$5.4M0.18%HELD
138CCITIGROUP INC$5.4M0.18%HELD
139SEISOLARIS ENERGY INFRAS INC$5.3M0.18%HELD
140MUSAMURPHY USA INC$5.3M0.18%HELD
141BABOEING CO$5.2M0.17%HELD
142FSLYFASTLY INC$5.2M0.17%HELD
143IWDISHARES TR$5.1M0.17%HELD
144LASRNLIGHT INC$5.1M0.17%HELD
145ENVAENOVA INTL INC$5.1M0.17%HELD
146XPOXPO INC$5.0M0.17%HELD
147ESEESCO TECHNOLOGIES INC$5.0M0.17%HELD
148PLXSPLEXUS CORP$5.0M0.17%HELD
149MYRGMYR GROUP INC$5.0M0.16%HELD
150MEDPMEDPACE HLDGS INC$4.8M0.16%HELD
151JBHTHUNT J B TRANS SVCS INC$4.8M0.16%HELD
152COCOVITA COCO CO INC$4.7M0.15%HELD
153ALGMALLEGRO MICROSYSTEMS INC$4.6M0.15%HELD
154ETENERGY TRANSFER L P$4.6M0.15%HELD
155RYTMRHYTHM PHARMACEUTICALS INC$4.5M0.15%HELD
156TEXTEREX CORP NEW$4.4M0.15%HELD
157FFORD MTR CO$4.4M0.15%HELD
158FROGJFROG LTD$4.4M0.14%HELD
159HDHOME DEPOT INC$4.2M0.14%HELD
160NOVTNOVANTA INC$4.1M0.14%HELD
161MANHMANHATTAN ASSOCIATES INC$4.1M0.13%HELD
162TKRTIMKEN CO$4.1M0.13%HELD
163TRPTC ENERGY CORP$4.1M0.13%HELD
164HQYHEALTHEQUITY INC$4.1M0.13%HELD
165MSMORGAN STANLEY$3.9M0.13%HELD
166AXSMAXSOME THERAPEUTICS INC.$3.9M0.13%HELD
167IQVIQVIA HLDGS INC$3.9M0.13%HELD
168KMIKINDER MORGAN INC DEL$3.8M0.13%HELD
169AXONAXON ENTERPRISE INC$3.8M0.12%HELD
170XENEXENON PHARMACEUTICALS INC$3.8M0.12%HELD
171MUMICRON TECHNOLOGY INC$3.7M0.12%HELD
172RRXREGAL REXNORD CORPORATION$3.6M0.12%HELD
173SGISOMNIGROUP INTERNATIONAL INC$3.6M0.12%HELD
174HOODROBINHOOD MKTS INC$3.5M0.12%HELD
175OXYOCCIDENTAL PETE CORP$3.4M0.11%HELD
176TWLOTWILIO INC$3.4M0.11%HELD
177JLLJONES LANG LASALLE INC$3.3M0.11%HELD
178BELFBBEL FUSE INC$3.2M0.11%HELD
179IRTCIRHYTHM HOLDINGS INC$3.2M0.11%HELD
180OKEONEOK INC NEW$3.1M0.10%HELD
181COINCOINBASE GLOBAL INC$3.1M0.10%HELD
182QQQINVESCO QQQ TR$3.1M0.10%HELD
183EYENATIONAL VISION HLDGS INC$3.0M0.10%HELD
184EPDENTERPRISE PRODS PARTNERS L$3.0M0.10%HELD
185FIGSFIGS INC$2.9M0.10%HELD
186COSTCOSTCO WHOLESALE CORPORATION$2.8M0.09%HELD
187MDGLMADRIGAL PHARMACEUTICALS INC$2.8M0.09%HELD
188MARMARRIOTT INTL INC NEW$2.7M0.09%HELD
189ENBENBRIDGE INC$2.7M0.09%HELD
190HHYATT HOTELS CORP$2.6M0.08%HELD
191URIUNITED RENTALS INC$2.5M0.08%HELD
192COGTCOGENT BIOSCIENCES INC$2.5M0.08%HELD
193CELHCELSIUS HLDGS INC$2.4M0.08%HELD
194MPLXMPLX LP$2.4M0.08%HELD
195MGYMAGNOLIA OIL & GAS CORP$2.4M0.08%HELD
196CAMTCAMTEK LTD$2.3M0.08%HELD
197CDECOEUR MNG INC$2.3M0.08%HELD
198XMTRXOMETRY INC$2.2M0.07%HELD
199AAOIAPPLIED OPTOELECTRONICS INC$2.2M0.07%HELD
200IWPISHARES TR$2.0M0.07%HELD
201FTAIFTAI AVIATION LTD$1.9M0.06%HELD
202MRCYMERCURY SYS INC$1.8M0.06%HELD
203VLOVALERO ENERGY CORP$1.8M0.06%HELD
204RACEFERRARI N V$1.8M0.06%HELD
205AROCARCHROCK INC$1.8M0.06%HELD
206DKSDICKS SPORTING GOODS INC$1.7M0.06%HELD
207LECOLINCOLN ELEC HLDGS INC$1.7M0.06%HELD
208IWFISHARES TR$1.6M0.05%HELD
209PAAPLAINS ALL AMERN PIPELINE L$1.6M0.05%HELD
210TERTERADYNE INC$1.6M0.05%HELD
211CEGCONSTELLATION ENERGY CORP$1.4M0.05%HELD
212REALTHE REALREAL INC$1.4M0.05%HELD
213DTMDT MIDSTREAM INC$1.3M0.04%HELD
214INSMINSMED INC$1.3M0.04%HELD
215VNOMVIPER ENERGY INC$1.1M0.04%HELD
216HESMHESS MIDSTREAM LP$1.1M0.04%HELD
217LQDISHARES TR$1.1M0.04%HELD
218CHRWC H ROBINSON WORLDWIDE IN$1.1M0.04%HELD
219FSLRFIRST SOLAR INC$1.1M0.04%HELD
220MLMMARTIN MARIETTA MATLS INC$1.0M0.03%HELD
221CMECME GROUP INC$1.0M0.03%HELD
222AMANTERO MIDSTREAM CORP$996K0.03%HELD
223WMSADVANCED DRAIN SYS INC DEL$986K0.03%HELD
224FANFIRST TR EXCHANGE-TRADED FD$975K0.03%HELD
225WWDWOODWARD INC$974K0.03%HELD
226SUNSUNOCO LP/SUNOCO FIN CORP$939K0.03%HELD
227RKLBROCKET LAB CORP$931K0.03%HELD
228QCOMQUALCOMM INC$895K0.03%HELD
229KGSKODIAK GAS SVCS INC$893K0.03%HELD
230TDGTRANSDIGM GROUP INC$892K0.03%HELD
231MTZMASTEC INC$865K0.03%HELD
232IEVISHARES TR$822K0.03%HELD
233NEXTNEXTDECADE CORP$814K0.03%HELD
234AXPAMERICAN EXPRESS CO$809K0.03%HELD
235GWREGUIDEWIRE SOFTWARE INC$775K0.03%HELD
236QUREQUANTA SVCS INC$758K0.03%HELD
237NFGNATIONAL FUEL GAS CO$720K0.02%HELD
238CRKCOMSTOCK RES INC$703K0.02%HELD
239FLEXFLEXTRONICS INTL LTD$693K0.02%HELD
240EMEEMCOR GROUP INC$672K0.02%HELD
241ETRENTERGY CORP NEW$671K0.02%HELD
242PCARPACCAR INC$667K0.02%HELD
243GLNGGOLAR LNG LTD$661K0.02%HELD
244CRSCARPENTER TECHNOLOGY CORP$631K0.02%HELD
245VSTVISTRA CORP$625K0.02%HELD
246NEENEXTERA ENERGY INC$618K0.02%HELD
247TLNTALEN ENERGY CORP$613K0.02%HELD
248BKVBKV CORP$556K0.02%HELD
249ISRGINTUITIVE SURGICAL INC$553K0.02%HELD
250WESWESTERN MIDSTREAM PARTNERS L$551K0.02%HELD
251PGPROCTER & GAMBLE CO$549K0.02%HELD
252SNPSSYNOPSYS INC$544K0.02%HELD
253USACUSA COMPRESSION PARTNERS LP$542K0.02%HELD
254LITELUMENTUM HLDGS INC$541K0.02%HELD
255GELGENESIS ENERGY L P$535K0.02%HELD
256MTDRMATADOR RES CO$528K0.02%HELD
257KNTKKINETIK HOLDINGS INC$502K0.02%HELD
258CTASCINTAS CORP$501K0.02%HELD
259RKTROCKET COS INC$498K0.02%HELD
260EOGEOG RES INC$434K0.01%HELD
261SBUXSTARBUCKS CORP$414K0.01%HELD
262IWOISHARES TR$377K0.01%HELD
263FDXFEDEX CORP$356K0.01%HELD
264EWJISHARES INC$327K0.01%HELD
265VRTXVERTEX PHARMACEUTICALS INC$326K0.01%HELD
266KOCOCA COLA CO$258K0.01%HELD
267MOG/AMOOG INC$252K0.01%HELD
268POWLPOWELL INDS INC$222K0.01%HELD
269FCXFREEPORT MCMORAN INC$212K0.01%HELD
270ETNEATON CORP PLC$211K0.01%HELD
271EWCISHARES INC$201K0.01%HELD
272IWNISHARES TR$201K0.01%HELD
273ITWILLINOIS TOOL WKS INC$200K0.01%HELD
274PRIMPRIMORIS SVCS CORP$199K0.01%HELD
275NRGNRG ENERGY INC$191K0.01%HELD
276GNTXGENTEX CORP$188K0.01%HELD
277IRENIREN LIMITED$180K0.01%HELD
278EWTISHARES INC$178K0.01%HELD
279CMICUMMINS INC$161K0.01%HELD
280TRMBTRIMBLE INC$141K0.00%HELD
281EEMISHARES TR$114K0.00%HELD
282SYKSTRYKER CORPORATION$112K0.00%HELD
283FISVFISERV INC$112K0.00%HELD
284NKENIKE INC$106K0.00%HELD
285EWAISHARES INC$105K0.00%HELD
286EWYISHARES INC$103K0.00%HELD
287PFEPFIZER INC$83K0.00%HELD
288LUVSOUTHWEST AIRLS CO$59K0.00%HELD
289RPMRPM INTL INC$58K0.00%HELD
290FFIVF5 INC$41K0.00%HELD
291PAYXPAYCHEX INC$33K0.00%HELD
292SDASEALED AIR CORP NEW$30K0.00%HELD

Source: SEC EDGAR · accession 0001106832-26-000003. 13F discloses long positions only — shorts, foreign equities, and options are excluded.