ARDSLEY ADVISORY PARTNERS LP
Reported holdings as of Q2 2026, from 31 quarterly filings.
This filer last reported in Q2 2026; the most recent quarter on file across all filers is Q3 2026. Firms that restructure stop filing under one CIK and start under another, so a successor entity may hold these positions now under a similar name.
Holdings
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| Security | Ticker | Value | Shares | Weight | Weight change | Held | Change |
|---|---|---|---|---|---|---|---|
| SANDISK CORP | SNDK | $56.7M | 25,000 | +1.45pp | 4q | -40.5%-$38.5M | |
| ADVANCED MICRO DEVICES INC | AMD | $54.0M | 93,000 | +5.42pp | 2q | +1062.5%+$49.4M | |
| SEZZLE INC | SEZL | $36.9M | 215,000 | +1.42pp | 3q | -28.3%-$14.6M | |
| TERAWULF INC | WULF | $23.7M | 966,000 | +0.54pp | 9q | -8.0%-$2.1M | |
| BRIGHTSPRING HEALTH SVCS INC | BTSG | $22.7M | 325,000 | +0.46pp | 5q | -7.1%-$1.7M | |
| EBAY INC. | EBAY | $22.3M | 201,000 | +0.69pp | 4q | +43.1%+$6.7M | |
| SUNRUN INC | RUN | $21.4M | 1,600,000 | +0.27pp | 21q | +41.0%+$6.2M | |
| EVERPURE INC CALL | P | $20.7M | 233,000 | - | new | NEW | |
| VIAVI SOLUTIONS INC | VIAV | $18.6M | 390,000 | +0.24pp | 3q | -2.5%-$477.5K | |
| ARM HOLDINGS PLC | ARM | $16.6M | 47,000 | +1.38pp | 7q | +161.1%+$10.3M | |
| SHOALS TECHNOLOGIES GROUP IN | SHLS | $16.5M | 1,665,000 | -0.18pp | 6q | -26.3%-$5.9M | |
| AMAZON COM INC | AMZN | $16.4M | 69,000 | -2.38pp | 21q | -34.9%-$8.8M | |
| UNITED THERAPEUTICS CORP DEL | UTHR | $16.3M | 30,000 | -2.09pp | 2q | -40.0%-$10.8M | |
| TEVA PHARMACEUTICAL INDS LTD | TEVA | $15.8M | 465,000 | -0.49pp | 9q | -16.2%-$3.0M | |
| ALPHABET INC | GOOG | $15.3M | 43,500 | +0.50pp | 23q | +45.0%+$4.8M | |
| PALO ALTO NETWORKS INC | PANW | $14.6M | 43,000 | - | new | NEW | |
| TWILIO INC | TWLO | $14.2M | 69,000 | +0.65pp | 3q | +46.2%+$4.5M | |
| ZOOM COMMUNICATIONS INC CALL | ZM | $13.6M | 145,000 | +0.33pp | 2q | +74.7%+$5.8M | |
| PRIMORIS SVCS CORP | PRIM | $13.4M | 135,000 | - | new | NEW | |
| APPLE INC | AAPL | $13.0M | 45,000 | +0.38pp | 2q | HELD | |
| MODINE MFG CO | MOD | $12.0M | 45,000 | -1.27pp | 3q | -50.6%-$12.3M | |
| ONTO INNOVATION INC | ONTO | $11.9M | 31,500 | - | new | NEW | |
| TD SYNNEX CORPORATION | SNX | $11.6M | 43,500 | - | new | NEW | |
| BROOKDALE SR LIVING INC CALL | BKD | $11.1M | options only | -0.48pp | 3q | OPTIONS | |
| ENPHASE ENERGY INC | ENPH | $10.8M | 220,000 | +0.71pp | 3q | +158.8%+$6.6M | |
| ALLEGIANT TRAVEL CO | ALGT | $10.6M | 90,000 | - | new | NEW | |
| OKTA INC | OKTA | $10.4M | 76,500 | +0.36pp | 2q | +13.2%+$1.2M | |
| EQUINIX INC | EQIX | $10.4M | 10,000 | -0.41pp | 2q | +25.8%+$2.1M | |
| HUT 8 CORP | HUT | $10.4M | 90,000 | +0.18pp | 5q | -40.0%-$6.9M | |
| ALPS ETF TR | AMLP | $10.4M | 200,000 | -0.26pp | 2q | HELD | |
| OSCAR HEALTH INC | OSCR | $10.0M | 350,000 | - | new | NEW | |
| BLOOM ENERGY CORP | BE | $9.4M | 31,000 | +0.76pp | 5q | +138.5%+$5.5M | |
| CIPHER DIGITAL INC | CIFR | $9.2M | 375,000 | +0.22pp | 2q | -16.7%-$1.8M | |
| NU HLDGS LTD | NU | $9.0M | 675,000 | -0.30pp | 5q | HELD | |
| FUELCELL ENERGY INC CALL | FCEL | $8.9M | 120,000 | +0.88pp | 2q | +166.7%+$5.5M | |
| CEREBRAS SYSTEMS INC | CBRS | $8.7M | 39,000 | - | new | NEW | |
| LUMENTUM HLDGS INC | LITE | $8.5M | 10,000 | +0.33pp | 4q | +61.3%+$3.2M | |
| REMITLY GLOBAL INC | RELY | $8.4M | 375,000 | - | new | NEW | |
| DEVON ENERGY CORP NEW | DVN | $8.3M | 200,000 | - | new | NEW | |
| BROADCOM INC | AVGO | $7.9M | 21,000 | -4.68pp | 8q | -76.5%-$25.9M | |
| ALASKA AIR GROUP INC | ALK | $7.8M | 150,000 | +0.04pp | 2q | -9.1%-$783.0K | |
| CORNING INC | GLW | $7.7M | 30,000 | - | new | NEW | |
| FLUOR CORP | FLR | $7.5M | 142,500 | +0.29pp | 15q | +72.7%+$3.1M | |
| VERTEX PHARMACEUTICALS INC | VRTX | $7.5M | 15,000 | - | new | NEW | |
| VERACYTE INC | VCYT | $7.3M | 125,000 | +0.25pp | 3q | HELD | |
| SEMTECH CORP | SMTC | $7.3M | 45,000 | -2.07pp | 4q | -82.6%-$34.6M | |
| JAZZ PHARMACEUTICALS PLC | JAZZ | $7.2M | 30,000 | - | new | NEW | |
| FERROGLOBE PLC | GSM | $6.9M | 2,185,000 | - | new | NEW | |
| AKAMAI TECHNOLOGIES INC | AKAM | $6.6M | 56,000 | - | new | NEW | |
| ORACLE CORP CALL | ORCL | $6.6M | options only | - | new | OPTIONS | |
| VERIZON COMMUNICATIONS INC | VZ | $6.6M | 155,000 | -0.15pp | 2q | +19.2%+$1.1M | |
| BOX INC | BOX | $6.4M | 240,000 | -0.35pp | 2q | +1.7%+$106.2K | |
| MICROCHIP TECHNOLOGY INC. | MCHP | $6.3M | 70,000 | - | new | NEW | |
| SLB LIMITED | SLB | $6.3M | 135,000 | - | new | NEW | |
| XPLR INFRASTRUCTURE LP | XIFR | $6.2M | 525,000 | flat | 10q | +10.5%+$590.5K | |
| CAMTEK LTD | CAMT | $6.0M | 37,000 | - | new | NEW | |
| MIRION TECHNOLOGIES INC | MIR | $5.8M | 325,000 | -0.16pp | 13q | HELD | |
| SALESFORCE INC | CRM | $5.6M | 36,000 | - | new | NEW | |
| GUARDIAN METAL RES PLC | GMTL | $5.6M | 400,000 | - | new | NEW | |
| GENEDX HOLDINGS CORP | WGS | $5.1M | 75,000 | -0.28pp | 5q | -25.0%-$1.7M | |
| APPLIED OPTOELECTRONICS INC | AAOI | $5.1M | 35,000 | - | new | NEW | |
| SERVICENOW INC CALL | NOW | $5.1M | 21,500 | -0.59pp | 3q | -70.3%-$12.1M | |
| ADMA BIOLOGICS INC | ADMA | $5.0M | 600,000 | +0.03pp | 2q | +41.2%+$1.5M | |
| CLEARWAY ENERGY INC | CWEN | $4.8M | 140,000 | -0.20pp | 6q | HELD | |
| AEVA TECHNOLOGIES INC CALL | AEVA | $4.8M | 121,500 | - | new | NEW | |
| TRANSALTA CORP | TAC | $4.8M | 345,000 | +0.04pp | 8q | +25.5%+$968.4K | |
| IMPINJ INC | PI | $4.7M | 33,000 | +0.34pp | 3q | +187.0%+$3.1M | |
| BORGWARNER INC | BWA | $4.6M | 70,000 | - | new | NEW | |
| NAVAN INC | NAVN | $4.6M | 200,000 | - | new | NEW | |
| GLOBALFOUNDRIES INC | GFS | $4.5M | 54,500 | - | new | NEW | |
| FLOWSERVE CORP | FLS | $4.4M | 60,000 | - | new | NEW | |
| LAM RESEARCH CORP | LRCX | $4.3M | 10,000 | - | new | NEW | |
| CVS HEALTH CORP | CVS | $4.1M | 40,000 | -0.35pp | 5q | -52.9%-$4.7M | |
| MANHATTAN ASSOCIATES INC | MANH | $4.0M | 28,500 | - | new | NEW | |
| GLOBAL E ONLINE LTD | GLBE | $3.9M | 113,000 | - | new | NEW | |
| BWX TECHNOLOGIES INC | BWXT | $3.9M | 20,000 | -0.25pp | 5q | -20.0%-$973.2K | |
| AMPHENOL CORP | APH | $3.9M | 22,000 | - | new | NEW | |
| TEXAS INSTRS INC | TXN | $3.9M | 13,000 | +0.26pp | 3q | +116.7%+$2.1M | |
| SKEENA RES LTD NEW | SKE | $3.9M | 145,000 | -0.26pp | 2q | -17.1%-$799.8K | |
| PROFOUND MED CORP | PROF | $3.8M | 575,000 | -0.08pp | 10q | HELD | |
| WILLIAMS COS INC | WMB | $3.7M | 50,000 | -0.08pp | 4q | HELD | |
| SHOPIFY INC | SHOP | $3.7M | 32,500 | - | new | NEW | |
| WESTERN DIGITAL CORP | WDC | $3.5M | 5,500 | - | new | NEW | |
| ORION GROUP HLDGS INC | ORN | $3.4M | 200,000 | +0.07pp | 8q | HELD | |
| ATLASSIAN CORPORATION CALL | TEAM | $3.3M | 7,000 | - | new | NEW | |
| TIC SOLUTIONS INC | TIC | $3.2M | 400,000 | +0.02pp | 4q | +6.7%+$202.2K | |
| EOS ENERGY ENTERPRISES INC | EOSE | $3.2M | 550,000 | +0.15pp | 4q | +83.3%+$1.5M | |
| ALAMOS GOLD INC | AGI | $3.2M | 105,000 | -0.66pp | 4q | -40.0%-$2.1M | |
| COHU INC | COHU | $3.1M | 41,700 | - | new | NEW | |
| FLEX LTD | FLEX | $3.1M | 19,000 | - | new | NEW | |
| FORTREA HLDGS INC | FTRE | $3.0M | 175,000 | - | new | NEW | |
| STMICROELECTRONICS N V | STM | $3.0M | 41,000 | - | new | NEW | |
| WOLFSPEED INC | WOLF | $2.9M | 60,000 | +0.01pp | 3q | -57.1%-$3.9M | |
| VEECO INSTRS INC DEL | VECO | $2.8M | 37,000 | - | new | NEW | |
| ALDEYRA THERAPEUTICS INC CALL | ALDX | $2.7M | 975,000 | +0.01pp | 8q | +2.6%+$69.6K | |
| KBR INC | KBR | $2.6M | 75,000 | - | new | NEW | |
| ENERGY TRANSFER L P | ET | $2.4M | 125,000 | +0.07pp | 3q | +66.7%+$957.5K | |
| PAGAYA TECHNOLOGIES LTD | PGY | $2.3M | 125,000 | - | new | NEW | |
| TRIPADVISOR INC | TRIP | $2.3M | 166,000 | - | new | NEW | |
| HA SUSTAINABLE INFRA CAP INC | HASI | $2.1M | 55,000 | -0.03pp | 11q | HELD | |
| SENTINELONE INC | S | $2.0M | 118,000 | +0.13pp | 2q | +156.5%+$1.2M | |
| AVERY DENNISON CORP | AVY | $1.9M | 12,000 | -0.68pp | 3q | -70.0%-$4.5M | |
| BAKER HUGHES COMPANY | BKR | $1.9M | 35,000 | - | new | NEW | |
| COGNIZANT TECHNOLOGY SOLUTIO PUT | CTSH | $1.9M | options only | - | new | OPTIONS | |
| ENERGY SERVICES OF AMER CORP | ESOA | $1.9M | 100,000 | +0.03pp | 4q | HELD | |
| NEBIUS GROUP N.V. | NBIS | $1.9M | 7,000 | - | new | NEW | |
| AXT INC CALL | AXTI | $1.8M | 17,000 | - | new | NEW | |
| CAMECO CORP | CCJ | $1.8M | 17,500 | -0.13pp | 8q | -22.2%-$509.3K | |
| SNAP INC | SNAP | $1.6M | 350,000 | +0.13pp | 3q | HELD | |
| COMSTOCK INC | LODE | $1.5M | 350,000 | +0.02pp | 2q | HELD | |
| COSTAR GROUP INC PUT | CSGP | $1.4M | options only | - | new | OPTIONS | |
| VIANT TECHNOLOGY INC CALL | DSP | $1.4M | 95,000 | - | new | NEW | |
| TC ENERGY CORP | TRP | $1.3M | 20,000 | - | new | NEW | |
| RAMACO RES INC | METC | $1.3M | 100,000 | -0.18pp | 4q | -37.5%-$793.8K | |
| DENISON MINES CORP | DNN | $1.2M | 400,000 | -0.50pp | 14q | -71.4%-$3.1M | |
| NETSKOPE INC | NTSK | $1.2M | 109,500 | - | new | NEW | |
| OPERA LTD | OPRA | $1.2M | 60,000 | - | new | NEW | |
| EQUIFAX INC | EFX | $1.1M | 7,000 | - | new | NEW | |
| WESTERN MIDSTREAM PARTNERS L | WES | $1.1M | 25,000 | - | new | NEW | |
| MAGNITE INC | MGNI | $1.1M | 57,500 | -0.10pp | 2q | -26.3%-$389.1K | |
| HIMAX TECHNOLOGIES INC CALL | HIMX | $1.1M | options only | -0.05pp | 2q | OPTIONS | |
| SUNPOWER INC | SPWR | $973.3K | 1,416,065 | -0.05pp | 4q | +47.5%+$313.5K | |
| COMMVAULT SYS INC | CVLT | $864.6K | 6,100 | - | new | NEW | |
| AMERICAN SUPERCONDUCTOR CORP | AMSC | $830.2K | 20,000 | -0.02pp | 2q | -20.0%-$207.6K | |
| LSB INDS INC | LXU | $810.8K | 75,000 | +0.04pp | 2q | +200.0%+$540.5K | |
| KORN FERRY PUT | KFY | $665.8K | options only | - | new | OPTIONS | |
| ITRON INC | ITRI | $649.0K | 7,500 | -0.10pp | 3q | -50.0%-$649.0K | |
| NIOCORP DEVS LTD | NB | $602.5K | 125,000 | - | new | NEW | |
| FTAI INFRASTRUCTURE INC | FIP | $464.0K | 100,000 | - | new | NEW | |
| FLUENCE ENERGY INC | FLNC | $395.4K | 20,000 | -0.28pp | 2q | -89.2%-$3.3M | |
| TRONOX HOLDINGS PLC | TROX | $315.0K | 50,000 | - | new | NEW | |
| SOLAREDGE TECHNOLOGIES INC | SEDG | $292.2K | 5,000 | - | new | NEW | |
| MP MATERIALS CORP | MP | $280.4K | 5,000 | -0.06pp | 2q | -66.7%-$560.8K | |
| IVANHOE ELECTRIC INC | IE | $240.2K | 25,000 | -0.01pp | 2q | HELD | |
| USA RARE EARTH INC | USAR | $216.2K | 10,000 | - | new | NEW | |
| BIOCERES CROP SOLUTIONS CORP | BIOX | $166.3K | 475,000 | -0.01pp | 16q | HELD |
By sector
Industry comes from the SIC code on each company's own SEC filings, which is self-reported and sometimes out of date. Derivative exposure is counted with the shares. Securities the SEC assigns no industry - funds, trusts, foreign issues - are shown as not classified rather than dropped.
| Sector | Value | Share |
|---|---|---|
| Semiconductors & Electronics | $225.0M | 23.4% |
| Software & IT Services | $112.2M | 11.7% |
| Computer Hardware | $108.5M | 11.3% |
| Business Services | $80.6M | 8.4% |
| Banks & Lending | $54.5M | 5.7% |
| Biotech & Pharma | $54.4M | 5.7% |
| Healthcare Services | $53.4M | 5.6% |
| Mining & Metals | $32.9M | 3.4% |
| Construction & Building | $29.7M | 3.1% |
| Instruments & Controls | $27.5M | 2.9% |
| Energy | $23.1M | 2.4% |
| Autos & Aerospace | $21.4M | 2.2% |
| Other sectors | $117.8M | 12.3% |
| Not classified | $19.0M | 2.0% |
What the disclosed book did
This is not the fund's return. A 13F shows long US equity positions only, so shorts, bonds, foreign listings, private holdings and cash are all invisible here. What this measures is the quarter's change in value of the positions this manager disclosed, had they been left untouched - the return a reader following the filing would have earned.
| Quarter | Book | Market | Difference | Priced |
|---|---|---|---|---|
| Q2 2026 | +42.7% | +14.8% | +27.8% | 90% |
| Q1 2026 | +2.9% | -4.6% | +7.5% | 91% |
| Q4 2025 | +10.7% | +2.4% | +8.3% | 88% |
| Q3 2025 | +18.8% | +7.8% | +10.9% | 95% |
| Q2 2025 | +28.7% | +10.5% | +18.2% | 86% |
| Q1 2025 | -15.3% | -4.6% | -10.8% | 88% |
| Q4 2024 | +1.5% | +2.1% | -0.6% | 87% |
| Q3 2024 | +5.7% | +5.4% | +0.3% | 90% |
Market is SPY over the same two quarter ends, priced the same way as everything else here - the median across every filer reporting it. It is a large-cap US proxy, so a manager holding small caps or biotech will beat or trail it for reasons that are not skill. Prices are quarter-end to quarter-end and say nothing about the path in between, or about trades opened and closed inside a quarter.
Quarter by quarter
| Quarter | Value | Positions | New | Added | Trimmed | Exited | Top 10 | Days to file |
|---|---|---|---|---|---|---|---|---|
| Q2 2026 | $960.2M | 136 | 60 | 28 | 33 | 51 | 30.6% | 13 |
| Q1 2026 | $784.4M | 127 | 53 | 30 | 31 | 50 | 34.9% | 45 |
| Q4 2025 | $911.1M | 124 | 52 | 29 | 36 | 39 | 30.7% | 48 |
| Q3 2025 | $808.7M | 111 | 49 | 25 | 23 | 66 | 34.6% | 45 |
| Q2 2025 | $760.6M | 128 | 67 | 35 | 24 | 48 | 35.1% | 45 |
| Q1 2025 | $522.4M | 109 | 51 | 26 | 25 | 57 | 32.6% | 45 |
| Q4 2024 | $630.6M | 115 | 48 | 33 | 28 | 47 | 28.0% | 45 |
| Q3 2024 | $608.0M | 114 | 44 | 38 | 27 | 47 | 32.5% | 45 |
| Q2 2024 | $680.8M | 117 | 37 | 33 | 42 | 44 | 39.7% | 45 |
| Q1 2024 | $696.1M | 124 | 52 | 33 | 26 | 44 | 40.4% | 45 |
| Q4 2023 | $647.9M | 116 | 55 | 30 | 24 | 35 | 46.1% | 45 |
| Q3 2023 | $447.9M | 96 | 37 | 18 | 36 | 49 | 41.7% | 45 |
| Q2 2023 | $591.7M | 108 | 45 | 29 | 28 | 38 | 43.8% | 45 |
| Q1 2023 | $455.2M | 101 | 42 | 31 | 24 | 38 | 44.8% | 45 |
| Q4 2022 | $482.9M | 97 | 50 | 25 | 19 | 37 | 42.7% | 45 |
| Q3 2022 | $446.6M | 84 | 31 | 23 | 23 | 47 | 42.4% | 45 |
| Q2 2022 | $607.8M | 100 | 37 | 29 | 30 | 51 | 49.1% | 46 |
| Q1 2022 | $599.4M | 114 | 66 | 24 | 19 | 39 | 44.2% | 46 |
| Q4 2021 | $524.7M | 87 | 39 | 26 | 18 | 61 | 48.1% | 45 |
| Q3 2021 | $656.0M | 109 | 44 | 24 | 30 | 52 | 55.1% | 46 |
| Q2 2021 | $851.1M | 117 | 51 | 26 | 18 | 47 | 48.0% | 47 |
| Q1 2021 | $822.1M | 113 | 47 | 26 | 33 | 49 | 51.5% | 47 |
| Q4 2020 | $609.2M | 115 | 59 | 27 | 21 | 79 | 48.6% | 47 |
| Q3 2020 | $518.3M | 135 | 60 | 27 | 28 | 50 | 48.2% | 44 |
| Q2 2020 | $470.1M | 125 | 73 | 20 | 20 | 45 | 52.9% | 45 |
| Q1 2020 | $255.2M | 97 | 33 | 15 | 37 | 74 | 50.5% | 45 |
| Q4 2019 | $626.7M | 138 | 68 | 28 | 26 | 51 | 47.2% | 45 |
| Q3 2019 | $445.9M | 121 | 37 | 29 | 32 | 58 | 47.1% | 45 |
| Q2 2019 | $633.7M | 142 | 61 | 35 | 29 | 43 | 46.4% | 46 |
| Q1 2019 | $521.2M | 124 | 54 | 32 | 26 | 29 | 44.5% | 45 |
| Q4 2018 | $397.9M | 99 | 0 | 0 | 0 | 0 | 44.2% | 45 |
Rows marked UNVERIFIED ID, PLACEHOLDER ID, TICKER AS ID or NON-CUSIP ID carry an identifier that is not a valid CUSIP. They are shown because the filer reported that money, but treat the security named with caution - hover the chip for what is wrong with it, and see the methodology.
Held counts consecutive filings in which this manager reported the position, and can reach further back than the quarters listed above: the tabs begin at Q4 2018 because earlier coverage is too sparse to describe a market, but tenure is counted over every filing we hold, some reaching to 2007. A position sold and later rebought starts again from one.
Weight change is the shift in this position's share of the whole book, in percentage points. It is the more useful column: when money flows into or out of a broad fund, almost every holding is bought or sold at once, so added and trimmed largely track flows. A weight that rose while the book shrank is a decision. Both compare with the previous quarter this filer reported, not the previous calendar quarter.