Ardsley Advisory Partners LP

In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 14, 2025), Ardsley Advisory Partners LP reported 99 stock positions worth $652.1 million. Its top holding was First Solar (FSLR) at 4.4% of the portfolio, followed by Hut 8 (HUT, 4.3%) and Sunrun (RUN, 4.2%). Compared with Q2 2025, it opened 43 new positions, sold out of 52, added to 26 and reduced 23. The biggest buy was First Solar (FSLR, shares +760%) and the biggest sale Fluor (FLR, shares −83%).

Most Recent 13F
Q2 2026
Location
Norwalk, CT
CIK
0000900529
Portfolio Value
$652.1M (Q3 2025)
SEC Filing
0001172661-25-004897 ↗ filed Nov 14, 2025

Holdings Value

0$200.0M$400.0M$600.0M$800.0M$1.0B Q1 2024: $696.1M Q1 2024 Q2 2024: $552.7M Q2 2024 Q3 2024: $528.5M Q3 2024 Q4 2024: $516.3M Q4 2024 Q1 2025: $431.7M Q1 2025 Q2 2025: $611.9M Q2 2025 Q3 2025: $652.1M $652.1M Q3 2025 Q4 2025: $785.4M Q4 2025 Q1 2026: $656.4M Q1 2026 Q2 2026: $921.1M Q2 2026

Holdings 99 stocks · $652.1M

FSLR First Solar Inc. 4.36% 129,000 $28.4M Add +760.0%
HUT Hut 8 Corp. 4.27% 800,000 $27.8M Add +52.4%
RUN Sunrun Inc. 4.24% 1,600,000 $27.7M Add +416.1%
ORCL Oracle Corp. 3.66% 85,000 $23.9M Reduce -15.0%
AVGO Broadcom Inc. 3.06% 60,500 $20.0M Reduce -21.4%
MSFT Microsoft Corp. 2.93% 37,000 $19.1M Reduce -11.9%
GOOG Alphabet Inc. Class C 2.91% 78,000 $19.0M Add +34.5%
EOSE Eos Energy Enterprises Inc. 2.78% 1,600,000 $18.1M New
AMZN Amazon.com Inc. 2.54% 75,500 $16.6M Add +19.8%
ARM Arm Holdings PLC-ADR 2.34% 108,000 $15.3M Add +0.5%
NVDA Nvidia Corp. 2.26% 79,000 $14.7M Reduce -47.7%
LITE Lumentum Holdings Inc. 2.15% 86,000 $14.0M New
GLW Corning Inc. 2.11% 167,878 $13.8M Add +10.4%
WULF Terawulf Inc. 2.11% 1,200,000 $13.7M Reduce -27.3%
BTSG Brightspring Health Services 2.04% 450,000 $13.3M Add +200.0%
SIMO Silicon Motion Technol-ADR 1.93% 133,000 $12.6M New
SHOP Shopify Inc. Class A 1.90% 83,200 $12.4M Add +40.1%
TER Teradyne Inc. 1.86% 88,000 $12.1M Add +453.5%
AGI Alamos Gold Inc. Class A 1.74% 325,000 $11.3M New
SNDK Sandisk Corp. 1.72% 100,000 $11.2M New
ARGX Argenx SE - ADR 1.70% 15,000 $11.1M New
TEVA Teva Pharmaceutical-SP ADR 1.55% 500,000 $10.1M Add +25.0%
NU Nu Holdings Ltd./Cayman Isl-A filed as NU HLDGS LTD 1.53% 625,000 $10.0M Add +25.0%
ALDX Aldeyra Therapeutics Inc. 1.52% 1,900,000 $9.9M Reduce -7.3%
OKTA Okta Inc. 1.49% 106,000 $9.7M New
AAOI Applied Optoelectronics Inc. 1.47% 364,500 $9.6M New
XIFR XPLR Infrastructure LP 1.37% 880,000 $8.9M Add +20.6%
RIOT Riot Platforms Inc. 1.31% 450,000 $8.6M Add +38.5%
SLV iShares Silver Trust 1.30% 200,000 $8.5M New
LSCC Lattice Semiconductor Corp. 1.29% 114,500 $8.4M Add +76.2%
P Everpure Inc. Class A filed as PURE STORAGE INC 1.29% 100,000 $8.4M New
MIR Mirion Technologies Inc. 1.17% 328,220 $7.6M Reduce -29.1%
AEIS Advanced Energy Industries 1.16% 44,500 $7.6M Add +27.1%
CVS CVS Health Corp. 1.16% 100,000 $7.5M Reduce -9.1%
BWXT BWX Technologies Inc. 1.13% 40,000 $7.4M Reduce -52.9%
THC Tenet Healthcare Corp. 1.09% 35,000 $7.1M New
OSCR Oscar Health Inc. Class A 1.09% 375,000 $7.1M New
WGS Genedx Holdings Corp. 0.99% 60,000 $6.5M Reduce -25.0%
PANW Palo Alto Networks Inc. 0.98% 31,300 $6.4M Add +60.5%
ADMA Adma Biologics Inc. 0.96% 425,000 $6.2M Add +6.3%
STKL Sunopta Inc. 0.92% 1,020,000 $6.0M No change
APP AppLovin Corp. Class A 0.88% 8,000 $5.7M No change
SMTC Semtech Corp. 0.88% 80,000 $5.7M New
FLR Fluor Corp. 0.87% 135,000 $5.7M Reduce -83.0%
DNN Denison Mines Corp. 0.84% 2,000,000 $5.5M No change
DKNG Draftkings Inc. Class A 0.83% 145,000 $5.4M Add +16.0%
EBAY eBay Inc. 0.82% 59,000 $5.4M New
ONTO Onto Innovation Inc. 0.80% 40,500 $5.2M New
IBM Intl Business Machines Corp. filed as INTERNATIONAL BUSINESS MACHS 0.78% 18,000 $5.1M New
ANET Arista Networks Inc. 0.76% 34,000 $5.0M Reduce -84.4%
WMB Williams Cos Inc. 0.73% 75,000 $4.8M New
PYPL PayPal Holdings Inc. 0.68% 66,000 $4.4M Add +120.0%
MTZ Mastec Inc. 0.65% 20,000 $4.3M New
BKR Baker Hughes Co. 0.64% 85,000 $4.1M New
FLS Flowserve Corp. 0.61% 75,000 $4.0M Add +200.0%
TSM Taiwan Semiconductor-SP ADR 0.60% 14,000 $3.9M New
PD Pagerduty Inc. 0.58% 227,000 $3.8M New
INTC Intel Corp. 0.57% 110,500 $3.7M New
COHR Coherent Corp. 0.55% 33,500 $3.6M Reduce -61.5%
WDC Western Digital Corp. 0.55% 30,000 $3.6M New
CWEN Clearway Energy Inc. Class C 0.54% 125,000 $3.5M Add +127.3%
ORN Orion Group Holdings Inc. 0.48% 375,000 $3.1M Add +15.4%
AAON Aaon Inc. 0.46% 32,200 $3.0M New
DQ Daqo New Energy Corp.-ADR 0.43% 100,000 $2.8M New
CFLT Confluent Inc. Class A 0.41% 135,000 $2.7M New
ETSY Etsy Inc. 0.39% 38,000 $2.5M New
NXE Nexgen Energy Ltd. 0.34% 250,000 $2.2M Add +400.0%
HASI Ha Sustainable Infrastructur 0.26% 55,000 $1.7M No change
AMRC Ameresco Inc. Class A 0.26% 50,000 $1.7M New
AES AES Corp. 0.25% 125,000 $1.6M Add +25.0%
PROF Profound Medical Corp. 0.25% 330,000 $1.6M No change
NOK Nokia Corp.-Spon ADR 0.25% 334,906 $1.6M Reduce -11.9%
TAC Transalta Corp. 0.24% 115,000 $1.6M Add +9.5%
AFRM Affirm Holdings Inc. 0.22% 20,000 $1.5M Reduce -89.8%
CRM Salesforce Inc. 0.22% 6,000 $1.4M New
METC Ramaco Resources Inc. Class A 0.20% 40,000 $1.3M New
MGNI Magnite Inc. 0.20% 60,000 $1.3M Reduce -83.8%
TTI Tetra Technologies Inc. 0.15% 175,000 $1.0M No change
DOCU Docusign Inc. 0.14% 13,000 $937K New
AIOT Powerfleet Inc. 0.14% 175,000 $917K No change
CCJ Cameco Corp. 0.13% 10,000 $839K Reduce -73.7%
ROKU Roku Inc. 0.12% 8,000 $801K New
ESOA Energy Services of America 0.12% 75,000 $776K New
EVLV Evolv Technologies Holdings 0.12% 100,000 $755K Reduce -50.0%
TIC Tic Solutions Inc. filed as ACUREN CORP 0.10% 50,000 $666K New
SVIIF Spring Valley Acquisition-A 0.10% 50,000 $626K New
BE Bloom Energy Corp. Class A 0.06% 5,000 $423K Reduce -95.8%
SPWR Sunpower Inc. filed as COMPLETE SOLARIA INC 0.06% 210,000 $370K New
IDR Idaho Strategic Resources Inc. 0.05% 10,000 $338K New
NPWR Net Power Inc. 0.05% 107,817 $325K New
LGN Legence Corp. Class A 0.05% 10,000 $308K New
NRGV Energy Vault Holdings Inc. 0.05% 100,000 $297K New
TRIP Tripadvisor Inc. 0.04% 18,000 $293K Reduce -90.5%
NKE Nike Inc. Class B 0.03% 3,000 $209K New
PTON Peloton Interactive Inc. Class A 0.03% 20,000 $180K New
SHLS Shoals Technologies Group -A 0.02% 20,000 $148K Reduce -93.3%
CLNE Clean Energy Fuels Corp. 0.02% 50,000 $129K Reduce -50.0%
BFLY Butterfly Network Inc. 0.01% 50,000 $97K New
BIOX Bioceres Crop Solutions Corp. 0.01% 60,000 $85K Reduce -94.0%

Options reported separately and not counted above: MRVL puts ($34.9M), GOOG calls ($17.0M), ICLN calls ($10.1M), AVGO calls ($9.9M), HUT calls ($9.6M), CRM calls ($6.4M), DQ calls ($5.6M), APH puts ($5.6M), TAN calls ($4.4M), AAOI calls ($4.3M), MGNI calls ($4.2M), ORCL calls ($4.2M), and 19 more.

Portfolio Sells Q2 2025 → Q3 2025

FLR Fluor Corp. Reduce -83.0% 0.87% −5.80
CLS Celestica Inc. Sold out 0.00% −3.44
ANET Arista Networks Inc. Reduce -84.4% 0.76% −2.88
HUM Humana Inc. Sold out 0.00% −2.00
AFRM Affirm Holdings Inc. Reduce -89.8% 0.22% −1.99
NOW ServiceNow Inc. Sold out 0.00% −1.93
NFLX Netflix Inc. Sold out 0.00% −1.86
INDV Indivior Ltd. Sold out 0.00% −1.75
TEL Te Connectivity PLC Sold out 0.00% −1.64
NVDA Nvidia Corp. Reduce -47.7% 2.26% −1.63
DAVE Dave Inc. Sold out 0.00% −1.54
CIEN Ciena Corp. Sold out 0.00% −1.46
SPRY Ars Pharmaceuticals Inc. Sold out 0.00% −1.35
MGNI Magnite Inc. Reduce -83.8% 0.20% −1.26
CORZ Core Scientific Inc. Sold out 0.00% −1.26
CYBR Cyberark Software Ltd./Israel Sold out 0.00% −1.21
GSM Ferroglobe PLC Sold out 0.00% −1.20
META Meta Platforms Inc. Class A Sold out 0.00% −1.15
SGRY Surgery Partners Inc. Sold out 0.00% −1.09
MDT Medtronic PLC Sold out 0.00% −1.00
RELY Remitly Global Inc. Sold out 0.00% −0.92
BWXT BWX Technologies Inc. Reduce -52.9% 1.13% −0.87
ZS Zscaler Inc. Sold out 0.00% −0.82
MELI MercadoLibre Inc. Sold out 0.00% −0.77
SMIN iShares MSCI India Small-Cap Sold out 0.00% −0.76
COHR Coherent Corp. Reduce -61.5% 0.55% −0.71
BIOX Bioceres Crop Solutions Corp. Reduce -94.0% 0.01% −0.71
STM Stmicroelectronics NV-NY SHS Sold out 0.00% −0.65
FLEX Flex Ltd. Sold out 0.00% −0.55
MP MP Materials Corp. Sold out 0.00% −0.52
MSFT Microsoft Corp. Reduce -11.9% 2.93% −0.48
MIR Mirion Technologies Inc. Reduce -29.1% 1.17% −0.46
AESI Atlas Energy Solutions Inc. Sold out 0.00% −0.44
AMPL Amplitude Inc. Class A Sold out 0.00% −0.43
AVGO Broadcom Inc. Reduce -21.4% 3.06% −0.41
ADSK Autodesk Inc. Sold out 0.00% −0.40
BE Bloom Energy Corp. Class A Reduce -95.8% 0.06% −0.40
HOOD Robinhood Markets Inc. Class A Sold out 0.00% −0.40
WNS WNS Holdings Ltd. Sold out 0.00% −0.36
TRIP Tripadvisor Inc. Reduce -90.5% 0.04% −0.36
CCJ Cameco Corp. Reduce -73.7% 0.13% −0.33
FISV Fiserv Inc. Sold out 0.00% −0.29
BOX Box Inc. Class A Sold out 0.00% −0.27
MANH Manhattan Associates Inc. Sold out 0.00% −0.26
RBLX Roblox Corp. Class A Sold out 0.00% −0.26
WGS Genedx Holdings Corp. Reduce -25.0% 0.99% −0.22
FIP Ftai Infrastructure Inc. Sold out 0.00% −0.20
SHLS Shoals Technologies Group -A Reduce -93.3% 0.02% −0.19
BABA Alibaba Group Holding-SP ADR Sold out 0.00% −0.19
OKLO Oklo Inc. Sold out 0.00% −0.18

Portfolio Buys Q2 2025 → Q3 2025

FSLR First Solar Inc. Add +760.0% 4.36% +3.96
RUN Sunrun Inc. Add +416.1% 4.24% +3.83
EOSE Eos Energy Enterprises Inc. New 2.78% +2.78
HUT Hut 8 Corp. Add +52.4% 4.27% +2.67
LITE Lumentum Holdings Inc. New 2.15% +2.15
SIMO Silicon Motion Technol-ADR New 1.93% +1.93
AGI Alamos Gold Inc. Class A New 1.74% +1.74
SNDK Sandisk Corp. New 1.72% +1.72
ARGX Argenx SE - ADR New 1.70% +1.70
TER Teradyne Inc. Add +453.5% 1.86% +1.62
OKTA Okta Inc. New 1.49% +1.49
AAOI Applied Optoelectronics Inc. New 1.47% +1.47
BTSG Brightspring Health Services Add +200.0% 2.04% +1.46
SLV iShares Silver Trust New 1.30% +1.30
P Everpure Inc. Class A New 1.29% +1.29
GOOG Alphabet Inc. Class C Add +34.5% 2.91% +1.23
THC Tenet Healthcare Corp. New 1.09% +1.09
OSCR Oscar Health Inc. Class A New 1.09% +1.09
SMTC Semtech Corp. New 0.88% +0.88
EBAY eBay Inc. New 0.82% +0.82
GLW Corning Inc. Add +10.4% 2.11% +0.81
ONTO Onto Innovation Inc. New 0.80% +0.80
IBM Intl Business Machines Corp. New 0.78% +0.78
SHOP Shopify Inc. Class A Add +40.1% 1.90% +0.78
LSCC Lattice Semiconductor Corp. Add +76.2% 1.29% +0.77
WMB Williams Cos Inc. New 0.73% +0.73
RIOT Riot Platforms Inc. Add +38.5% 1.31% +0.71
MTZ Mastec Inc. New 0.65% +0.65
BKR Baker Hughes Co. New 0.64% +0.64
TSM Taiwan Semiconductor-SP ADR New 0.60% +0.60
PD Pagerduty Inc. New 0.58% +0.58
INTC Intel Corp. New 0.57% +0.57
WDC Western Digital Corp. New 0.55% +0.55
AAON Aaon Inc. New 0.46% +0.46
TEVA Teva Pharmaceutical-SP ADR Add +25.0% 1.55% +0.45
DQ Daqo New Energy Corp.-ADR New 0.43% +0.43
NU Nu Holdings Ltd./Cayman Isl-A Add +25.0% 1.53% +0.41
CFLT Confluent Inc. Class A New 0.41% +0.41
AEIS Advanced Energy Industries Add +27.1% 1.16% +0.40
FLS Flowserve Corp. Add +200.0% 0.61% +0.40
XIFR XPLR Infrastructure LP Add +20.6% 1.37% +0.39
ETSY Etsy Inc. New 0.39% +0.39
PANW Palo Alto Networks Inc. Add +60.5% 0.98% +0.33
PYPL PayPal Holdings Inc. Add +120.0% 0.68% +0.31
NXE Nexgen Energy Ltd. Add +400.0% 0.34% +0.29
AMZN Amazon.com Inc. Add +19.8% 2.54% +0.28
AMRC Ameresco Inc. Class A New 0.26% +0.26
CWEN Clearway Energy Inc. Class C Add +127.3% 0.54% +0.25
CRM Salesforce Inc. New 0.22% +0.22
METC Ramaco Resources Inc. Class A New 0.20% +0.20

Options Activity Q2 2025 → Q3 2025

MRVL Marvell Technology Inc. put Reduce -7.4% 415,000 $34.9M
SPY SS SPDR S&P 500 ETF Trust-US call Sold out 50,000 $30.9Mbefore exit
AMD Advanced Micro Devices put Sold out 155,000 $22.0Mbefore exit
GOOG Alphabet Inc. Class C call New 70,000 $17.0M
ICLN iShares Global Clean Energy call Add +62.5% 650,000 $10.1M
AVGO Broadcom Inc. call New 30,000 $9.9M
HUT Hut 8 Corp. call Add +266.7% 275,000 $9.6M
CRM Salesforce Inc. call New 27,000 $6.4M
DQ Daqo New Energy Corp.-ADR call New 200,000 $5.6M
APH Amphenol Corp. Class A put New 45,000 $5.6M
FSLR First Solar Inc. call Sold out 30,000 $5.0Mbefore exit
AAOI Applied Optoelectronics Inc. call New 165,000 $4.3M
MGNI Magnite Inc. call New 195,000 $4.2M
ORCL Oracle Corp. call New 15,000 $4.2M
FLR Fluor Corp. call Sold out 75,000 $3.8Mbefore exit
ADI Analog Devices Inc. put New 15,000 $3.7M
COHR Coherent Corp. put New 34,000 $3.7M
MSFT Microsoft Corp. put Sold out 7,000 $3.5Mbefore exit
PDD PDD Holdings Inc. call New 25,000 $3.3M
CFLT Confluent Inc. Class A call New 160,000 $3.2M
CRWD CrowdStrike Holdings Inc. Class A put Sold out 6,000 $3.1Mbefore exit
SMTC Semtech Corp. call New 40,000 $2.9M
ARM Arm Holdings PLC-ADR call Reduce -20.0% 20,000 $2.8M
PD Pagerduty Inc. call New 170,000 $2.8M
ALAB Astera Labs Inc. put New 14,000 $2.7M
MU Micron Technology Inc. put Sold out 20,000 $2.5Mbefore exit
ASML ASML Holding NV-NY Reg SHS put Sold out 3,000 $2.4Mbefore exit
INFY Infosys Ltd.-SP ADR put New 140,000 $2.3M
HUBS HubSpot Inc. put Sold out 4,000 $2.2Mbefore exit
RUN Sunrun Inc. call Reduce -36.7% 125,000 $2.2M
TRIP Tripadvisor Inc. call Add +116.7% 130,000 $2.1M
ACN Accenture PLC Class A put Sold out 7,000 $2.1Mbefore exit
LSCC Lattice Semiconductor Corp. call Sold out 42,000 $2.1Mbefore exit
SMH Vaneck Semiconductor ETF put Sold out 7,000 $2.0Mbefore exit
SMR Nuscale Power Corp. put New 50,000 $1.8M
LRCX Lam Research Corp. put Sold out 18,000 $1.8Mbefore exit
BOX Box Inc. Class A call Sold out 50,000 $1.7Mbefore exit
P Everpure Inc. Class A call New 20,000 $1.7M
UTI Universal Technical Institut put Sold out 45,000 $1.5Mbefore exit
WULF Terawulf Inc. call Sold out 300,000 $1.3Mbefore exit
CORZ Core Scientific Inc. call Sold out 75,000 $1.3Mbefore exit
NOK Nokia Corp.-Spon ADR call Sold out 240,000 $1.2Mbefore exit
INTA Intapp Inc. put Sold out 20,000 $1.0Mbefore exit
PTON Peloton Interactive Inc. Class A call New 100,000 $900K
SHLS Shoals Technologies Group -A call Sold out 200,000 $850Kbefore exit
NKE Nike Inc. Class B call New 10,000 $697K
ZETA Zeta Global Holdings Corp. Class A put Reduce -5.4% 35,000 $695K
IOT Samsara Inc. Class A put Sold out 17,000 $676Kbefore exit
ARLO Arlo Technologies Inc. put Sold out 34,000 $577Kbefore exit
TTD Trade Desk Inc./the Class A put Sold out 8,000 $576Kbefore exit

Showing the first 50 of 54.

Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 130$921.1MSNDK, AMD, SEZL, WULF, BTSG
Q1 2026 117$656.4MUTHR, AVGO, SNDK, AMZN, ANET
Q4 2025 113$785.4MLLY, FSLR, LITE, AVGO, RUN
Q3 2025 99$652.1MFSLR, HUT, RUN, ORCL, AVGO
Q2 2025 108$611.9MFLR, NVDA, ANET, ORCL, AVGO
Q1 2025 102$431.7MFLR, AVGO, AGI, CLS, OKTA
Q4 2024 101$516.3MCRM, FLR, ITRI, OSCR, INDV
Q3 2024 109$528.5MOSCR, ITRI, RUN, FLR, CLS
Q2 2024 108$552.7MRUN, FTAI, CLS, ITRI, OSCR
Q1 2024 124$696.1MSPY, RUN, CLS, STKL, ITRI