Castleark Management LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 15, 2026), Castleark Management LLC reported 292 stock positions worth $3.0 billion. Its top holding was Nvidia (NVDA) at 7.3% of the portfolio, followed by Alphabet Class A (GOOGL, 4.0%) and Microsoft (MSFT, 3.2%). Compared with Q4 2025, it opened 53 new positions, sold out of 55, added to 65 and reduced 101. The biggest buy was a new position in Diamondback Energy (FANG) and the biggest sale Microsoft (MSFT, shares −29%).
- Most Recent 13F
- Q2 2026
- Location
- CHICAGO, IL
- CIK
- 0001106832
- Portfolio Value
- $3.0B (Q1 2026)
- SEC Filing
- 0001106832-26-000003 ↗ filed May 15, 2026
Holdings Value
Holdings 292 stocks · $3.0B
| NVDA Nvidia Corp. | 7.26% | 1,258,012 | $219.4M | Reduce -10.7% |
| GOOGL Alphabet Inc. Class A | 3.98% | 418,019 | $120.2M | Add +9.5% |
| MSFT Microsoft Corp. | 3.23% | 264,102 | $97.8M | Reduce -28.5% |
| SPIB SS SPDR P Int C Corp. ETF | 2.98% | 2,688,380 | $90.2M | Add +6.7% |
| AAPL Apple Inc. | 2.94% | 350,011 | $88.8M | Reduce -9.6% |
| GOVT iShares US Treasury Bond ETF | 2.52% | 3,329,569 | $76.3M | No change |
| LRCX Lam Research Corp. | 2.38% | 336,740 | $71.9M | Reduce -9.7% |
| META Meta Platforms Inc. Class A | 2.35% | 123,965 | $70.9M | Add +1.3% |
| VMBS Vanguard Mortgage-Backed Sec | 2.31% | 1,487,800 | $69.9M | Reduce -12.8% |
| LLY Eli Lilly & Co. | 2.24% | 73,478 | $67.6M | Reduce -9.9% |
| AVGO Broadcom Inc. | 2.08% | 202,704 | $62.7M | Reduce -1.5% |
| ANET Arista Networks Inc. | 1.75% | 430,935 | $52.9M | Add +4.8% |
| AMZN Amazon.com Inc. | 1.69% | 245,861 | $51.2M | Reduce -47.9% |
| GILD Gilead Sciences Inc. | 1.58% | 342,150 | $47.7M | Add +23.4% |
| SCHW Schwab (charles) Corp. | 1.57% | 504,053 | $47.4M | Reduce -19.0% |
| V Visa Inc. Class A | 1.54% | 153,826 | $46.5M | Reduce -9.8% |
| MA Mastercard Inc. Class A | 1.52% | 92,013 | $46.0M | Reduce -10.2% |
| SPTS SS SPDR P St Term TSY ETF | 1.29% | 1,334,080 | $38.9M | No change |
| SHOP Shopify Inc. Class A | 1.22% | 310,590 | $36.8M | Reduce -10.1% |
| GEV GE Vernova Inc. | 1.20% | 41,489 | $36.2M | Reduce -13.1% |
| VCLT Vanguard Long-Term Corp. Bond | 1.11% | 448,330 | $33.5M | Add +89.6% |
| NOW ServiceNow Inc. | 1.05% | 303,756 | $31.8M | Add +12.3% |
| TPR Tapestry Inc. | 0.95% | 204,470 | $28.9M | Add +43.9% |
| FANG Diamondback Energy Inc. | 0.95% | 145,020 | $28.7M | New |
| CVX Chevron Corp. | 0.93% | 136,550 | $28.3M | New |
| VRT Vertiv Holdings Co. Class A | 0.93% | 112,363 | $28.2M | Reduce -9.9% |
| ULTA Ulta Beauty Inc. | 0.88% | 50,629 | $26.5M | Add +1.4% |
| TLH iShares 10-20 Year Treasury | 0.86% | 258,432 | $26.0M | No change |
| ADI Analog Devices Inc. | 0.82% | 77,908 | $24.8M | Add +27.4% |
| BKR Baker Hughes Co. | 0.78% | 387,190 | $23.6M | Add +629.5% |
| BKNG Booking Holdings Inc. | 0.68% | 4,896 | $20.6M | Reduce -10.5% |
| SNOW Snowflake Inc. | 0.68% | 136,044 | $20.5M | Reduce -10.0% |
| MBB iShares MBS ETF | 0.64% | 204,235 | $19.4M | No change |
| RRC Range Resources Corp. | 0.61% | 410,520 | $18.5M | Add +454.6% |
| AMD Advanced Micro Devices | 0.60% | 88,954 | $18.1M | Reduce -15.1% |
| CF CF Industries Holdings Inc. | 0.55% | 129,150 | $16.8M | New |
| DOCN Digitalocean Holdings Inc. | 0.52% | 182,249 | $15.6M | Reduce -1.5% |
| ASND Ascendis Pharma A/S | 0.51% | 67,616 | $15.5M | Add +1.9% |
| AEIS Advanced Energy Industries | 0.50% | 46,623 | $15.0M | Reduce -5.1% |
| JPM JPMorgan Chase & Co. | 0.49% | 50,525 | $14.9M | Add +13.2% |
| GH Guardant Health Inc. | 0.49% | 160,283 | $14.8M | Reduce -2.9% |
| TSLA Tesla Inc. | 0.48% | 39,180 | $14.6M | Add +39.4% |
| TJX TJX Companies Inc. filed as TJX COS INC NEW | 0.48% | 90,620 | $14.5M | No change |
| WMT Walmart Inc. | 0.47% | 113,270 | $14.1M | No change |
| TSM Taiwan Semiconductor-SP ADR | 0.46% | 41,210 | $13.9M | Add +13.6% |
| IGIB iShares 5-10Y Inv Grade Corp. | 0.46% | 259,994 | $13.8M | No change |
| NXT Nextpower Inc. | 0.46% | 114,074 | $13.8M | Add +8.1% |
| PR Permian Resources Corp. Class A | 0.45% | 630,980 | $13.5M | New |
| FCFS Firstcash Holdings Inc. | 0.44% | 70,730 | $13.3M | Add +15.6% |
| MCHP Microchip Technology Inc. | 0.44% | 204,874 | $13.2M | Reduce -60.3% |
| VIAV Viavi Solutions Inc. | 0.42% | 378,597 | $12.6M | Add +8.4% |
| EQT Eqt Corp. | 0.41% | 193,845 | $12.3M | Reduce -5.8% |
| UBER Uber Technologies Inc. | 0.40% | 169,876 | $12.2M | Reduce -45.0% |
| TLT iShares 20+ Year Treasury BD | 0.39% | 137,270 | $11.9M | Add +45.2% |
| DY Dycom Industries Inc. | 0.36% | 32,506 | $11.0M | Reduce -14.8% |
| XOM Exxon Mobil Corp. | 0.36% | 64,460 | $10.9M | New |
| BTSG Brightspring Health Services | 0.35% | 247,200 | $10.5M | Add +55.9% |
| HLIO Helios Technologies Inc. | 0.34% | 160,409 | $10.4M | Add +9.3% |
| XBI SS SPDR S&P Biotech ETF | 0.34% | 80,890 | $10.3M | No change |
| CAT Caterpillar Inc. | 0.33% | 13,920 | $9.9M | No change |
| LGND Ligand Pharmaceuticals | 0.32% | 48,696 | $9.7M | Reduce -27.0% |
| WMB Williams Cos Inc. | 0.32% | 131,770 | $9.6M | Add +4.8% |
| ESI Element Solutions Inc. | 0.31% | 273,884 | $9.4M | Add +3.9% |
| FTI Technipfmc PLC | 0.31% | 135,176 | $9.3M | Reduce -32.7% |
| TSEM Tower Semiconductor Ltd. | 0.31% | 53,240 | $9.3M | New |
| VSEC Vse Corp. | 0.31% | 50,086 | $9.2M | Add +53.4% |
| JAZZ Jazz Pharmaceuticals PLC | 0.30% | 48,740 | $9.2M | New |
| FIVE Five Below | 0.30% | 40,110 | $9.2M | Reduce -17.0% |
| EVR Evercore Inc. Class A | 0.30% | 30,416 | $9.1M | Reduce -5.1% |
| TPC Tutor Perini Corp. | 0.30% | 116,440 | $9.0M | Add +13.9% |
| TTMI TTM Technologies | 0.29% | 91,230 | $8.9M | Reduce -30.8% |
| GTX Garrett Motion Inc. | 0.29% | 488,000 | $8.9M | Reduce -5.1% |
| HAS Hasbro Inc. | 0.29% | 94,701 | $8.9M | Add +29.9% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.29% | 181,512 | $8.7M | Reduce -5.6% |
| GE General Electric filed as GE AEROSPACE | 0.29% | 30,680 | $8.7M | Reduce -50.0% |
| STRL Sterling Infrastructure Inc. | 0.29% | 21,200 | $8.6M | Reduce -5.1% |
| SOLS Solstice Adv Materials Inc. | 0.28% | 113,050 | $8.6M | New |
| ELAN Elanco Animal Health Inc. | 0.28% | 355,950 | $8.5M | Add +931.4% |
| LSCC Lattice Semiconductor Corp. | 0.28% | 91,639 | $8.5M | Add +2.9% |
| GOOG Alphabet Inc. Class C | 0.28% | 29,610 | $8.5M | Add +323.0% |
| SPXC SPX Technologies Inc. | 0.28% | 41,567 | $8.3M | Reduce -16.6% |
| SMTC Semtech Corp. | 0.27% | 107,758 | $8.3M | Add +4.7% |
| XOP SS SPDR S&P Og Exp & Prod | 0.27% | 45,340 | $8.2M | New |
| XLV SS Health Care Select Sector | 0.27% | 56,130 | $8.2M | No change |
| MOD Modine Manufacturing Co. | 0.27% | 37,850 | $8.2M | Add +216.5% |
| BKD Brookdale Senior Living Inc. | 0.27% | 598,454 | $8.2M | New |
| KRYS Krystal Biotech Inc. | 0.27% | 31,630 | $8.2M | Add +8.1% |
| APG Api Group Corp. | 0.27% | 200,263 | $8.1M | Reduce -5.1% |
| BWA Borgwarner Inc. | 0.27% | 148,506 | $8.1M | Reduce -5.6% |
| ASB Associated Banc-Corp. | 0.27% | 311,423 | $8.1M | Add +7.5% |
| PL Planet Labs PBC | 0.26% | 285,650 | $8.0M | Reduce -26.7% |
| ACA Arcosa Inc. | 0.26% | 74,650 | $7.9M | Add +53.9% |
| PAHC Phibro Animal Health Corp. Class A | 0.26% | 142,900 | $7.9M | New |
| WCC Wesco International Inc. | 0.26% | 28,397 | $7.8M | Reduce -17.1% |
| KTOS Kratos Defense & Security | 0.26% | 109,634 | $7.7M | Reduce -28.3% |
| ADSK Autodesk Inc. | 0.25% | 31,940 | $7.6M | New |
| LBRT Liberty Energy Inc. | 0.25% | 264,789 | $7.6M | New |
| SF Stifel Financial Corp. | 0.25% | 102,010 | $7.5M | Reduce -31.0% |
| BE Bloom Energy Corp. Class A | 0.25% | 55,045 | $7.5M | Reduce -20.9% |
| GM General Motors Co. | 0.24% | 99,280 | $7.4M | No change |
Portfolio Sells Q4 2025 → Q1 2026
| MSFT Microsoft Corp. | Reduce -28.5% | 3.23% | −2.01 |
| AMZN Amazon.com Inc. | Reduce -47.9% | 1.69% | −1.50 |
| BX Blackstone Inc. | Sold out | 0.00% | −1.11 |
| EFA iShares MSCI Eafe ETF | Sold out | 0.00% | −0.98 |
| PODD Insulet Corp. | Sold out | 0.00% | −0.68 |
| SPOT Spotify Technology SA | Sold out | 0.00% | −0.57 |
| DAL Delta Air Lines Inc. | Sold out | 0.00% | −0.53 |
| MCHP Microchip Technology Inc. | Reduce -60.3% | 0.44% | −0.53 |
| NVDA Nvidia Corp. | Reduce -10.7% | 7.26% | −0.45 |
| SHOP Shopify Inc. Class A | Reduce -10.1% | 1.22% | −0.41 |
| ETN Eaton Corp. PLC | Reduce -98.7% | 0.01% | −0.41 |
| LLY Eli Lilly & Co. | Reduce -9.9% | 2.24% | −0.34 |
| UBER Uber Technologies Inc. | Reduce -45.0% | 0.40% | −0.34 |
| PIPR Piper Sandler Cos | Sold out | 0.00% | −0.32 |
| LITE Lumentum Holdings Inc. | Reduce -97.5% | 0.02% | −0.32 |
| SANM Sanmina Corp. | Sold out | 0.00% | −0.32 |
| SNOW Snowflake Inc. | Reduce -10.0% | 0.68% | −0.29 |
| MS Morgan Stanley | Reduce -70.2% | 0.13% | −0.29 |
| WGS Genedx Holdings Corp. | Sold out | 0.00% | −0.28 |
| CECO Ceco Environmental Corp. | Sold out | 0.00% | −0.28 |
| GE General Electric | Reduce -50.0% | 0.29% | −0.27 |
| JBTM JBT Marel Corp. | Sold out | 0.00% | −0.26 |
| SCHW Schwab (charles) Corp. | Reduce -19.0% | 1.57% | −0.26 |
| RMBS Rambus Inc. | Sold out | 0.00% | −0.26 |
| RKT Rocket Cos Inc. Class A | Reduce -92.7% | 0.02% | −0.26 |
| PLNT Planet Fitness Inc. Class A | Sold out | 0.00% | −0.26 |
| HCI Hci Group Inc. | Sold out | 0.00% | −0.24 |
| MIR Mirion Technologies Inc. | Sold out | 0.00% | −0.24 |
| AR Antero Resources Corp. | Sold out | 0.00% | −0.24 |
| COF Capital One Financial Corp. | Sold out | 0.00% | −0.23 |
| PEGA Pegasystems Inc. | Sold out | 0.00% | −0.23 |
| VMI Valmont Industries | Sold out | 0.00% | −0.23 |
| CRDO Credo Technology Group Holdi | Sold out | 0.00% | −0.23 |
| GTES Gates Industrial Corp. UK Ltd. | Sold out | 0.00% | −0.23 |
| C Citigroup Inc. | Reduce -59.6% | 0.18% | −0.22 |
| ODFL Old Dominion Freight Line | Reduce -64.6% | 0.22% | −0.22 |
| XMTR Xometry Inc. Class A | Reduce -67.3% | 0.07% | −0.22 |
| SIG Signet Jewelers Ltd. | Sold out | 0.00% | −0.22 |
| V Visa Inc. Class A | Reduce -9.8% | 1.54% | −0.22 |
| PI Impinj Inc. | Sold out | 0.00% | −0.21 |
| DG Dollar General Corp. | Sold out | 0.00% | −0.20 |
| HRI Herc Holdings Inc. | Sold out | 0.00% | −0.20 |
| TPB Turning Point Brands Inc. | Sold out | 0.00% | −0.20 |
| MA Mastercard Inc. Class A | Reduce -10.2% | 1.52% | −0.20 |
| SLV iShares Silver Trust | Sold out | 0.00% | −0.19 |
| MRCY Mercury Systems Inc. | Reduce -78.8% | 0.06% | −0.19 |
| ADPT Adaptive Biotechnologies | Sold out | 0.00% | −0.19 |
| RACE Ferrari NV | Reduce -76.3% | 0.06% | −0.18 |
| ATEC Alphatec Holdings Inc. | Sold out | 0.00% | −0.18 |
| BKNG Booking Holdings Inc. | Reduce -10.5% | 0.68% | −0.18 |
Portfolio Buys Q4 2025 → Q1 2026
| FANG Diamondback Energy Inc. | New | 0.95% | +0.95 |
| CVX Chevron Corp. | New | 0.93% | +0.93 |
| BKR Baker Hughes Co. | Add +629.5% | 0.78% | +0.71 |
| VCLT Vanguard Long-Term Corp. Bond | Add +89.6% | 1.11% | +0.58 |
| GILD Gilead Sciences Inc. | Add +23.4% | 1.58% | +0.58 |
| CF CF Industries Holdings Inc. | New | 0.55% | +0.55 |
| RRC Range Resources Corp. | Add +454.6% | 0.61% | +0.54 |
| SPIB SS SPDR P Int C Corp. ETF | Add +6.7% | 2.98% | +0.48 |
| GOOGL Alphabet Inc. Class A | Add +9.5% | 3.98% | +0.47 |
| PR Permian Resources Corp. Class A | New | 0.45% | +0.45 |
| TPR Tapestry Inc. | Add +43.9% | 0.95% | +0.42 |
| XOM Exxon Mobil Corp. | New | 0.36% | +0.36 |
| ADI Analog Devices Inc. | Add +27.4% | 0.82% | +0.33 |
| TSEM Tower Semiconductor Ltd. | New | 0.31% | +0.31 |
| JAZZ Jazz Pharmaceuticals PLC | New | 0.30% | +0.30 |
| SOLS Solstice Adv Materials Inc. | New | 0.28% | +0.28 |
| XOP SS SPDR S&P Og Exp & Prod | New | 0.27% | +0.27 |
| BKD Brookdale Senior Living Inc. | New | 0.27% | +0.27 |
| PAHC Phibro Animal Health Corp. Class A | New | 0.26% | +0.26 |
| ELAN Elanco Animal Health Inc. | Add +931.4% | 0.28% | +0.26 |
| ADSK Autodesk Inc. | New | 0.25% | +0.25 |
| LBRT Liberty Energy Inc. | New | 0.25% | +0.25 |
| MCO Moody's Corp. | New | 0.24% | +0.24 |
| KNX Knight-Swift Transportation | New | 0.24% | +0.24 |
| VIAV Viavi Solutions Inc. | Add +8.4% | 0.42% | +0.23 |
| KLIC Kulicke & Soffa Industries | New | 0.23% | +0.23 |
| PAY Paymentus Holdings Inc. Class A | New | 0.23% | +0.23 |
| MOD Modine Manufacturing Co. | Add +216.5% | 0.27% | +0.22 |
| ATMU Atmus Filtration Technologie | New | 0.22% | +0.22 |
| FAST Fastenal Co. | Add +2048.7% | 0.23% | +0.22 |
| GOOG Alphabet Inc. Class C | Add +323.0% | 0.28% | +0.22 |
| UCTT Ultra Clean Holdings Inc. | New | 0.21% | +0.21 |
| LINC Lincoln Educational Services | New | 0.20% | +0.20 |
| GWW WW Grainger Inc. | New | 0.20% | +0.20 |
| WH Wyndham Hotels & Resorts Inc. | New | 0.20% | +0.20 |
| ALSN Allison Transmission Holding | New | 0.20% | +0.20 |
| BC Brunswick Corp. | New | 0.19% | +0.19 |
| SJM The JM Smucker Co. | New | 0.19% | +0.19 |
| NXT Nextpower Inc. | Add +8.1% | 0.46% | +0.19 |
| MPC Marathon Petroleum Corp. | New | 0.18% | +0.18 |
| CGNX Cognex Corp. | New | 0.18% | +0.18 |
| MUSA Murphy USA Inc. | New | 0.18% | +0.18 |
| BTSG Brightspring Health Services | Add +55.9% | 0.35% | +0.17 |
| FSLY Fastly Inc. Class A | New | 0.17% | +0.17 |
| LASR Nlight Inc. | New | 0.17% | +0.17 |
| ANET Arista Networks Inc. | Add +4.8% | 1.75% | +0.17 |
| ENVA Enova International Inc. | New | 0.17% | +0.17 |
| PLXS Plexus Corp. | New | 0.17% | +0.17 |
| MYRG MYR Group Inc./Delaware | New | 0.16% | +0.16 |
| ALGM Allegro Microsystems Inc. | New | 0.15% | +0.15 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 309 | $3.7B | NVDA, GOOGL, AAPL, LRCX, MSFT |
| Q1 2026 | 292 | $3.0B | NVDA, GOOGL, MSFT, SPIB, AAPL |
| Q4 2025 | 294 | $3.4B | NVDA, MSFT, GOOGL, AMZN, AAPL |
| Q3 2025 | 284 | $3.6B | CARK, NVDA, MSFT, META, AAPL |
| Q2 2025 | 275 | $3.3B | CARK, NVDA, MSFT, AMZN, META |
| Q1 2025 | 280 | $2.9B | CARK, AAPL, NVDA, AMZN, MSFT |
| Q4 2024 | 283 | $2.9B | AAPL, NVDA, MSFT, SPIB, AMZN |
| Q3 2024 | 272 | $2.5B | MSFT, NVDA, AAPL, AMZN, GOOGL |
| Q2 2024 | 271 | $2.4B | NVDA, MSFT, AAPL, AMZN, GOOGL |
| Q1 2024 | 278 | $2.4B | MSFT, NVDA, AAPL, AMZN, META |