Ardsley Advisory Partners LP holds a diversified book of 116 stocks worth $656.4M as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). This quarter they opened UNITED THERAPEUTICS CORP and trimmed SANDISK CORP. Their largest long position is UNITED THERAPEUTICS CORP at 5% of the equity book. They also disclosed $18.5M in put options (a bearish bet) and $109.4M in call options (bullish), shown separately below and excluded from the equity book.
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Use Arkolith to show ARDSLEY ADVISORY PARTNERS LP's latest holdings, largest changes, and filing provenance.
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.
20% mapped to company sectors
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, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | United Therapeutics Corp Del COM | $29.6M | 50.0K | 4.5% | ▲New New position | |
| 2 | Broadcom Inc COM | $27.7M | 89.5K | 4.2% | ▲+6.5% Added · +6K sh | |
| 3 | Sandisk Corp COM | $26.7M | 42.0K | 4.1% | ▼−25% Reduced · −14K sh | |
| 4 | Amazon Com Inc COM | $22.1M | 106.0K | 3.4% | ▲+96% Added · +52K sh | |
| 5 | Arista Networks Inc COM SHS | $21.3M | 173.7K | 3.2% | ▲+74% Added · +74K sh | |
| 6 | Semtech Corp COM | $19.9M | 258.8K | 3.0% | ▲+9.2% Added · +22K sh | |
| 7 | Modine MFG Co COM | $19.7M | 91.1K | 3.0% | ▲25× Added · +88K sh | |
| 8 | Sezzle Inc COM | $19.0M | 300.0K | 2.9% | ▲+22% Added · +55K sh | |
| 9 | Teva Pharmaceutical Inds Ltd SPONSORED ADS | $16.7M | 555.0K | 2.5% | ▼−4.3% Reduced · −25K sh | |
| 10 | Meta Platforms Inc CL A | $16.0M | 28.0K | 2.4% | ▲14× Added · +26K sh | |
| 11 | Sunrun Inc COM | $15.4M | 1.14M | 2.3% | ▼−23% Reduced · −345K sh | |
| 12 | Nvidia Corporation COM | $15.3M | 87.5K | 2.3% | ▼−30% Reduced · −38K sh | |
| 13 | Terawulf Inc COM | $15.1M | 1.05M | 2.3% | ▼−9.9% Reduced · −115K sh | |
| 14 | Brightspring Health Svcs Inc COM | $14.9M | 350.0K | 2.3% | —Held | |
| 15 | Shoals Technologies Group In CL A | $14.9M | 2.26M | 2.3% | ▲90× Added · +2.2M sh | |
| 16 | Viavi Solutions Inc COM | $13.3M | 400.0K | 2.0% | ▼−9.1% Reduced · −40K sh | |
| 17 | Ebay Inc. COM | $12.8M | 140.5K | 1.9% | ▲+65% Added · +56K sh | |
| 18 | ALPS ETF TR ALERIAN MLP | $10.5M | 200.0K | 1.6% | ▲New New position | |
| 19 | Nu Hldgs Ltd ORD SHS CL A | $9.7M | 675.0K | 1.5% | ▲+5.5% Added · +35K sh | |
| 20 | Boston Scientific Corp COM | $9.4M | 150.0K | 1.4% | ▲New New position | |
| 21 | Alphabet Inc CAP STK CL C | $8.6M | 30.0K | 1.3% | ▼−47% Reduced · −27K sh | |
| 22 | Applied Matls Inc COM | $8.5M | 25.0K | 1.3% | ▲New New position | |
| 23 | Equinix Inc COM | $7.8M | 8.0K | 1.2% | ▲New New position | |
| 24 | Alamos Gold Inc COM CL A | $7.8M | 175.0K | 1.2% | ▼−42% Reduced · −125K sh | |
| 25 | Servicenow Inc COM | $7.6M | 72.5K | 1.2% | ▲+512% Added · +61K sh | |
| 26 | Lattice Semiconductor Corp COM | $7.6M | 81.5K | 1.2% | ▼−5.2% Reduced · −5K sh | |
| 27 | Hut 8 Corp COM | $7.0M | 150.0K | 1.1% | ▼−58% Reduced · −210K sh | |
| 28 | Avery Dennison Corp COM | $6.9M | 40.0K | 1.1% | ▲+90% Added · +19K sh | |
| 29 | Select Sector SPDR TR STATE STREET UTI | $6.9M | 150.0K | 1.0% | ▲+50% Added · +50K sh | |
| 30 | Zoom Communications Inc CL A | $6.7M | 83.0K | 1.0% | ▲New New position | |
| 31 | Verizon Communications Inc COM | $6.5M | 130.0K | 1.0% | ▲New New position | |
| 32 | Genedx Holdings Corp COM CL A | $6.4M | 100.0K | 1.0% | ▲+82% Added · +45K sh | |
| 33 | CVS Health Corp COM | $6.1M | 85.0K | 0.9% | —Held | |
| 34 | Alaska Air Group Inc COM | $6.1M | 165.0K | 0.9% | ▲New New position | |
| 35 | Mirion Technologies Inc COM CL A | $6.0M | 325.0K | 0.9% | —Held | |
| 36 | Twilio Inc CL A | $5.9M | 47.2K | 0.9% | ▼−24% Reduced · −15K sh | |
| 37 | Cipher Digital Inc COM | $5.8M | 450.0K | 0.9% | ▲New New position | |
| 38 | Box Inc CL A | $5.6M | 236.0K | 0.8% | ▲New New position | |
| 39 | Clearway Energy Inc CL C | $5.5M | 140.0K | 0.8% | ▼−6.7% Reduced · −10K sh | |
| 40 | Okta Inc CL A | $5.3M | 67.6K | 0.8% | ▲Added Added · +68K sh | |
| 41 | Skeena Res Ltd New COM | $5.2M | 175.0K | 0.8% | ▲New New position | |
| 42 | BWX Technologies Inc COM | $5.1M | 25.0K | 0.8% | —Held | |
| 43 | Analog Devices Inc COM | $5.1M | 16.0K | 0.8% | ▲New New position | |
| 44 | XPLR Infrastructure LP COM UNIT PART IN | $5.0M | 475.0K | 0.8% | ▲+5.5% Added · +25K sh | |
| 45 | Denison Mines Corp COM | $4.9M | 1.40M | 0.8% | ▼−66% Reduced · −2.7M sh | |
| 46 | Micron Technology Inc COM | $4.7M | 14.0K | 0.7% | ▲New New position | |
| 47 | Eli Lilly & Co COM | $4.6M | 5.0K | 0.7% | ▼−88% Reduced · −35K sh | |
| 48 | Lumentum Hldgs Inc COM | $4.4M | 6.2K | 0.7% | ▼−92% Reduced · −74K sh | |
| 49 | Anterix Inc COM | $4.2M | 110.0K | 0.6% | ▲New New position | |
| 50 | Veracyte Inc COM | $4.0M | 125.0K | 0.6% | —Held |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| CALL · bullish | SS SPDR S&P 500 ETF TRUST-USSPY | $31.9M | 49K |
| CALL · bullish | BROADCOM INC | $15.5M | 50K |
| CALL · bullish | AMAZON COM INC | $10.0M | 48K |
| CALL · bullish | BROOKDALE SR LIVING INC | $9.4M | 690K |
| CALL · bullish | SANDISK CORP | $8.3M | 13K |
| PUT · bearish | APPLE INC | $7.6M | 30K |
| CALL · bullish | MICRON TECHNOLOGY INC | $5.7M | 17K |
| CALL · bullish | EQUINIX INCEQIX | $3.9M | 4K |
| PUT · bearish | HEWLETT PACKARD ENTERPRISE C | $3.7M | 155K |
| CALL · bullish | ARISTA NETWORKS INC | $3.1M | 25K |
| PUT · bearish | DIGITALOCEAN HLDGS INC | $3.0M | 35K |
| PUT · bearish | COHERENT CORP | $2.4M | 10K |
| CALL · bullish | BOX INC | $2.4M | 100K |
| CALL · bullish | SEMTECH CORP | $2.3M | 30K |
| CALL · bullish | FORTINET INC | $2.0M | 25K |
| CALL · bullish | ZOOM COMMUNICATIONS INC | $1.8M | 23K |
| CALL · bullish | NVIDIA CORPORATION | $1.7M | 10K |
| CALL · bullish | MOSAIC CO/THEMOS | $1.3M | 50K |
| CALL · bullish | SERVICENOW INC | $1.3M | 12K |
| CALL · bullish | TASKUS INC | $1.1M | 170K |
| PUT · bearish | CONCENTRIX CORP | $1.1M | 40K |
| CALL · bullish | DAQO NEW ENERGY CORP | $1.1M | 50K |
| CALL · bullish | SS FINANCIAL SELECT SECTORXLF | $987K | 20K |
| CALL · bullish | INTEL CORP | $794K | 18K |
| CALL · bullish | MAGNITE INC | $772K | 65K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above. Showing the largest 25 of 34 option legs.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 151 | $784.4M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 17, 2026 | 142 | $911.1M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 14, 2025 | 130 | $808.7M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 14, 2025 | 145 | $760.6M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 15, 2025 | 139 | $522.4M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 14, 2025 | 143 | $630.6M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 14, 2024 | 128 | $608.0M | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 14, 2024 | 140 | $680.8M | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 15, 2024 | 124 | $696.1M | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 14, 2024 | 138 | $647.9M | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 14, 2023 | 114 | $447.9M | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 14, 2023 | 121 | $591.7M | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 15, 2023 | 101 | $455.2M | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 14, 2023 | 119 | $482.9M | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 14, 2022 | 103 | $446.6M | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 15, 2022 | 124 | $607.8M | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 16, 2022 | 126 | $599.4M | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 14, 2022 | 106 | $524.7M | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 15, 2021 | 126 | $656.0M | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 16, 2021 | 130 | $851.1M | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 17, 2021 | 123 | $822.1M | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 16, 2021 | 128 | $609.2M | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 13, 2020 | 145 | $518.3M | 13F-HR |
| Q2 2020 | Jun 30, 2020 | Aug 14, 2020 | 132 | $470.1M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; 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.