Castleark Management LLC holds a diversified book of 309 reported positions worth $3.7B as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter Space Exploration Techn-CL A first appears in 13F filings (one of 2 new listings in the book), a listing rather than a purchase; they opened Sharkninja Inc and trimmed Lam Research Corp. Their largest long position is Nvidia Corp at 7% of the reported non-option book. Cloning the disclosed picks since 2013 would be +347% (+12.4%/yr). That is a simulation of the disclosed long book, not audited returns.
The reported book (valued from quarter-end) returned +355.6%, a 9.0-point gap that is the cost of the ~45-day 13F disclosure lag a real follower can't avoid.
Growth of $10,000 cloning Castleark Management LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~45 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
88% mapped to company sectors
+4 sectors below the cut, 3% together
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Castleark Management LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| BlueSpruce Investments, LP | 12 / 80 | $643.9M |
| Draper Asset Management, LLC | 9 / 80 | $175.4M |
| Ketron Financial | 16 / 80 | $276.6M |
| Hamilton Capital Partners, LLC | 9 / 80 | $282.1M |
| Hoey Investments, Inc | 33 / 80 | $625.2M |
| Howard Hughes Medical Institute | 13 / 80 | $359.0M |
| New World Advisors LLC | 24 / 80 | $462.1M |
| Integrated Financial Solutions, Inc. | 13 / 80 | $141.9M |
Ranked by the share of each fund's own book sitting in the names it shares with Castleark Management LLC: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Nvidia Corporation COM | $260.0M | 1.30M | 7.0% | ▲+3.3% Added · +42K sh | |
| 2 | Alphabet Inc CAP STK CL A | $181.2M | 507.1K | 4.9% | ▲+21% Added · +89K sh | |
| 3 | Apple Inc COM | $136.6M | 472.1K | 3.7% | ▲+35% Added · +122K sh | |
| 4 | Lam Research Corp COM NEW | $123.0M | 283.8K | 3.3% | ▼−16% Reduced · −53K sh | |
| 5 | Microsoft Corp COM | $109.2M | 292.8K | 2.9% | ▲+11% Added · +29K sh | |
| 6 | Eli Lilly & Co COM | $105.2M | 87.7K | 2.8% | ▲+19% Added · +14K sh | |
| 7 | Broadcom Inc COM | $92.1M | 243.9K | 2.5% | ▲+20% Added · +41K sh | |
| 8 | SPDR Series Trust ST INTER BD ETF | $90.0M | 2.69M | 2.4% | —Held | |
| 9 | Visa Inc COM CL A | $81.0M | 236.2K | 2.2% | ▲+54% Added · +82K sh | |
| 10 | Arista Networks Inc COM SHS | $80.4M | 473.3K | 2.2% | ▲+9.8% Added · +42K sh | |
| 11 | Ishares TR US TREAS BD ETF | $75.8M | 3.33M | 2.0% | —Held | |
| 12 | Vanguard Scottsdale FDS MTG-BKD SECS ETF | $69.6M | 1.49M | 1.9% | —Held | |
| 13 | Advanced Micro Devices Inc COM | $69.0M | 118.9K | 1.9% | ▲+34% Added · +30K sh | |
| 14 | Gilead Sciences Inc COM | $66.6M | 527.5K | 1.8% | ▲+54% Added · +185K sh | |
| 15 | Amazon Com Inc COM | $63.9M | 268.2K | 1.7% | ▲+9.1% Added · +22K sh | |
| 16 | Ge Vernova Inc COM | $54.2M | 46.1K | 1.5% | ▲+11% Added · +5K sh | |
| 17 | Meta Platforms Inc CL A | $52.8M | 93.7K | 1.4% | ▼−24% Reduced · −30K sh | |
| 18 | Analog Devices Inc COM | $48.0M | 120.9K | 1.3% | ▲+55% Added · +43K sh | |
| 19 | Mastercard Incorporated CL A | $47.0M | 91.5K | 1.3% | ▼−0.6% Reduced · −551 sh | |
| 20 | Morgan Stanley COM NEW | $43.6M | 208.5K | 1.2% | ▲+781% Added · +185K sh | |
| 21 | Snowflake Inc COM SHS | $42.5M | 166.8K | 1.1% | ▲+23% Added · +31K sh | |
| 22 | Vertiv Holdings Co COM CL A | $41.5M | 123.9K | 1.1% | ▲+10% Added · +12K sh | |
| 23 | Tapestry Inc COM | $38.9M | 265.7K | 1.0% | ▲+30% Added · +61K sh | |
| 24 | SPDR Series Trust ST SHO TREAS ETF | $38.7M | 1.33M | 1.0% | —Held | |
| 25 | Vanguard Scottsdale FDS LG-TERM COR BD | $33.7M | 448.3K | 0.9% | —Held | |
| 26 | Servicenow Inc COM | $31.9M | 321.6K | 0.9% | ▲+5.9% Added · +18K sh | |
| 27 | Ishares TR 10-20 YR TRS ETF | $25.9M | 258.4K | 0.7% | —Held | |
| 28 | Booking Holdings Inc COM | $24.4M | 136.8K | 0.7% | ▲28× Added · +132K sh | |
| 29 | Moodys Corp COM | $24.2M | 53.4K | 0.7% | ▲+216% Added · +37K sh | |
| 30 | Tesla Inc COM | $20.2M | 48.1K | 0.5% | ▲+23% Added · +9K sh | |
| 31 | Caterpillar Inc COM | $20.2M | 19.0K | 0.5% | ▲+36% Added · +5K sh | |
| 32 | Ge Aerospace COM NEW | $19.7M | 52.8K | 0.5% | ▲+72% Added · +22K sh | |
| 33 | Taiwan Semiconductor Manufac SPONSORED ADS | $19.7M | 41.2K | 0.5% | —Held | |
| 34 | Ligand Pharmaceuticals Inc COM NEW | $19.6M | 62.0K | 0.5% | ▲+27% Added · +13K sh | |
| 35 | Sharkninja Inc COM SHS | $19.4M | 127.2K | 0.5% | ▲New New position | |
| 36 | Ishares TR MBS ETF | $19.3M | 204.2K | 0.5% | —Held | |
| 37 | Twilio Inc CL A | $19.1M | 92.4K | 0.5% | ▲+245% Added · +66K sh | |
| 38 | Baker Hughes Company CL A | $18.3M | 330.0K | 0.5% | ▼−15% Reduced · −57K sh | |
| 39 | Garrett Motion Inc COM | $17.0M | 469.5K | 0.5% | ▼−3.8% Reduced · −19K sh | |
| 40 | JPMorgan Chase & Co COM | $16.5M | 50.5K | 0.4% | —Held | |
| 41 | Ascendis Pharma A/s ORD SHS | $16.5M | 61.7K | 0.4% | ▲New New position | |
| 42 | Hunt J B Trans Svcs Inc COM | $16.4M | 56.5K | 0.4% | ▲+150% Added · +34K sh | |
| 43 | Diamondback Energy Inc COM | $15.9M | 90.7K | 0.4% | ▼−37% Reduced · −54K sh | |
| 44 | General MTRS Co COM | $15.4M | 199.4K | 0.4% | ▲+101% Added · +100K sh | |
| 45 | Brightspring Health Svcs Inc COM | $14.8M | 212.4K | 0.4% | ▼−14% Reduced · −35K sh | |
| 46 | Semtech Corp COM | $14.8M | 91.2K | 0.4% | ▼−15% Reduced · −17K sh | |
| 47 | Firstcash Holdings Inc COM | $14.8M | 68.2K | 0.4% | ▼−3.6% Reduced · −3K sh | |
| 48 | Marriott Intl Inc New CL A | $14.0M | 37.9K | 0.4% | ▲+353% Added · +30K sh | |
| 49 | Ishares TR ISHS 5-10YR INVT | $13.8M | 260.0K | 0.4% | —Held | |
| 50 | TJX Cos Inc New COM | $13.7M | 90.6K | 0.4% | —Held |
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1106832/holdings"
Use Arkolith to show CASTLEARK MANAGEMENT LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 14, 2026 | 45d | 309 | $3.7B | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 45d | 292 | $3.0B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 13, 2026 | 44d | 294 | $3.4B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 17, 2025 | 48d | 284 | $3.6B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 18, 2025 | 49d | 275 | $3.3B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 15, 2025 | 45d | 280 | $2.9B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 18, 2025 | 49d | 283 | $2.9B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 15, 2024 | 46d | 272 | $2.5B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 14, 2024 | 45d | 271 | $2.4B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 16, 2024 | 46d | 278 | $2.4B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 15, 2024 | 46d | 281 | $2.3B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 15, 2023 | 46d | 274 | $2.0B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 16, 2023 | 47d | 274 | $2.2B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 16, 2023 | 46d | 272 | $2.0B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 10, 2023 | 41d | 282 | $1.9B | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 15, 2022 | 46d | 284 | $1.8B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 16, 2022 | 47d | 306 | $1.9B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 16, 2022 | 46d | 321 | $2.3B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 16, 2022 | 47d | 326 | $2.7B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 12, 2021 | 43d | 328 | $2.6B | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 17, 2021 | 48d | 335 | $3.0B | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 14, 2021 | 44d | 330 | $2.8B | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 17, 2021 | 48d | 328 | $2.7B | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 16, 2020 | 47d | 343 | $2.6B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.