Ardsley Advisory Partners LP

In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 15, 2026), Ardsley Advisory Partners LP reported 117 stock positions worth $656.4 million. Its top holding was United Therapeutics (UTHR) at 4.5% of the portfolio, followed by Broadcom (AVGO, 4.2%) and Sandisk (SNDK, 4.1%). Compared with Q4 2025, it opened 48 new positions, sold out of 44, added to 30 and reduced 29. The biggest buy was a new position in United Therapeutics (UTHR) and the biggest sale Eli Lilly (LLY, shares −88%).

Most Recent 13F
Q2 2026
Location
Norwalk, CT
CIK
0000900529
Portfolio Value
$656.4M (Q1 2026)
SEC Filing
0001172661-26-002039 ↗ filed May 15, 2026

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 Q3 2025 Q4 2025: $785.4M Q4 2025 Q1 2026: $656.4M $656.4M Q1 2026 Q2 2026: $921.1M Q2 2026

Holdings 117 stocks · $656.4M

UTHR United Therapeutics Corp. 4.52% 50,000 $29.6M New
AVGO Broadcom Inc. 4.22% 89,500 $27.7M Add +6.5%
SNDK Sandisk Corp. 4.07% 42,000 $26.7M Reduce -25.0%
AMZN Amazon.com Inc. 3.36% 106,000 $22.1M Add +96.3%
ANET Arista Networks Inc. 3.25% 173,700 $21.3M Add +73.7%
SMTC Semtech Corp. 3.03% 258,750 $19.9M Add +9.2%
MOD Modine Manufacturing Co. 3.01% 91,100 $19.7M Add +2430.6%
SEZL Sezzle Inc. 2.89% 300,000 $19.0M Add +22.4%
TEVA Teva Pharmaceutical-SP ADR 2.55% 555,000 $16.7M Reduce -4.3%
META Meta Platforms Inc. Class A 2.44% 28,000 $16.0M Add +1300.0%
RUN Sunrun Inc. 2.34% 1,135,000 $15.4M Reduce -23.3%
NVDA Nvidia Corp. 2.32% 87,500 $15.3M Reduce -30.0%
WULF Terawulf Inc. 2.30% 1,050,000 $15.1M Reduce -9.9%
BTSG Brightspring Health Services 2.27% 350,000 $14.9M No change
SHLS Shoals Technologies Group -A 2.27% 2,260,000 $14.9M Add +8940.0%
VIAV Viavi Solutions Inc. 2.03% 400,000 $13.3M Reduce -9.1%
EBAY eBay Inc. 1.95% 140,500 $12.8M Add +65.3%
AMLP Alerian MLP ETF 1.60% 200,000 $10.5M New
NU Nu Holdings Ltd./Cayman Isl-A filed as NU HLDGS LTD 1.48% 675,000 $9.7M Add +5.5%
BSX Boston Scientific Corp. 1.43% 150,000 $9.4M New
GOOG Alphabet Inc. Class C 1.31% 30,000 $8.6M Reduce -47.4%
AMAT Applied Materials Inc. 1.30% 25,000 $8.5M New
EQIX Equinix Inc. 1.19% 7,950 $7.8M New
AGI Alamos Gold Inc. Class A 1.18% 175,000 $7.8M Reduce -41.7%
NOW ServiceNow Inc. 1.15% 72,500 $7.6M Add +511.8%
LSCC Lattice Semiconductor Corp. 1.15% 81,500 $7.6M Reduce -5.2%
HUT Hut 8 Corp. 1.07% 150,000 $7.0M Reduce -58.3%
AVY Avery Dennison Corp. 1.05% 40,000 $6.9M Add +90.5%
XLU St Sr Utl SL SE SPDR ETF-Usd 1.05% 150,000 $6.9M Add +50.0%
ZM Zoom Communications Inc. 1.02% 83,000 $6.7M New
VZ Verizon Communications Inc. 0.99% 130,000 $6.5M New
WGS Genedx Holdings Corp. 0.98% 100,000 $6.4M Add +81.8%
CVS CVS Health Corp. 0.93% 85,000 $6.1M No change
ALK Alaska Air Group Inc. 0.92% 165,000 $6.1M New
MIR Mirion Technologies Inc. 0.92% 325,000 $6.0M No change
TWLO Twilio Inc. Class A 0.90% 47,200 $5.9M Reduce -24.5%
CIFR Cipher Digital Inc. 0.88% 450,000 $5.8M New
BOX Box Inc. Class A 0.85% 236,000 $5.6M New
CWEN Clearway Energy Inc. Class C 0.84% 140,000 $5.5M Reduce -6.7%
OKTA Okta Inc. 0.81% 67,600 $5.3M New
SKE Skeena Resources Ltd. 0.79% 175,000 $5.2M New
BWXT BWX Technologies Inc. 0.78% 25,000 $5.1M No change
ADI Analog Devices Inc. 0.78% 16,000 $5.1M New
XIFR XPLR Infrastructure LP 0.77% 475,000 $5.0M Add +5.6%
DNN Denison Mines Corp. 0.75% 1,400,000 $4.9M Reduce -65.8%
MU Micron Technology Inc. 0.72% 14,000 $4.7M New
LLY Eli Lilly & Co. 0.70% 5,000 $4.6M Reduce -87.5%
LITE Lumentum Holdings Inc. 0.66% 6,200 $4.4M Reduce -92.3%
ATEX Anterix Inc. 0.64% 110,000 $4.2M New
VCYT Veracyte Inc. 0.61% 125,000 $4.0M No change
ROKU Roku Inc. 0.60% 41,500 $3.9M Add +361.1%
FLR Fluor Corp. 0.59% 82,500 $3.8M Add +3.1%
NFLX Netflix Inc. 0.59% 40,000 $3.8M Add +566.7%
ADMA Adma Biologics Inc. 0.58% 425,000 $3.8M New
HON Honeywell International Inc. 0.57% 16,500 $3.7M New
PROF Profound Medical Corp. 0.57% 575,000 $3.7M Add +27.8%
WMB Williams Cos Inc. 0.55% 50,000 $3.6M No change
TAC Transalta Corp. 0.55% 275,000 $3.6M Add +52.8%
NXE Nexgen Energy Ltd. 0.53% 300,000 $3.5M Reduce -73.3%
BKD Brookdale Senior Living Inc. 0.52% 250,000 $3.4M New
ORA Ormat Technologies Inc. 0.51% 30,000 $3.4M No change
ENPH Enphase Energy Inc. 0.49% 85,000 $3.2M Add +126.7%
MSFT Microsoft Corp. 0.45% 8,000 $3.0M Reduce -64.0%
BRBR Bellring Brands Inc. 0.43% 175,000 $2.8M Reduce -27.1%
ARM Arm Holdings PLC-ADR 0.41% 18,000 $2.7M New
FLNC Fluence Energy Inc. 0.39% 185,000 $2.5M New
METC Ramaco Resources Inc. Class A 0.38% 160,000 $2.5M Add +433.3%
TIC Tic Solutions Inc. 0.38% 375,000 $2.5M Add +150.0%
CCJ Cameco Corp. 0.37% 22,500 $2.4M Reduce -35.7%
INTC Intel Corp. 0.36% 53,000 $2.3M Add +3.9%
WOLF Wolfspeed Inc. 0.35% 140,000 $2.3M Reduce -15.2%
NET Cloudflare Inc. Class A 0.34% 10,800 $2.2M New
TER Teradyne Inc. 0.34% 7,500 $2.2M Reduce -87.5%
ORN Orion Group Holdings Inc. 0.33% 200,000 $2.2M Reduce -50.0%
RSP Invesco S&P 500 Equal Weight 0.32% 11,000 $2.1M New
AMPX Amprius Technologies Inc. 0.32% 125,000 $2.1M New
FTNT Fortinet Inc. 0.32% 25,600 $2.1M New
UPWK Upwork Inc. 0.32% 190,000 $2.1M New
FFIV F5 Inc. 0.31% 7,100 $2.1M New
HASI Ha Sustainable Infrastructur 0.31% 55,000 $2.0M No change
DIOD Diodes Inc. 0.31% 29,500 $2.0M New
UBER Uber Technologies Inc. 0.27% 24,500 $1.8M New
BE Bloom Energy Corp. Class A 0.27% 13,000 $1.8M Reduce -74.5%
AMD Advanced Micro Devices 0.25% 8,000 $1.6M New
AEIS Advanced Energy Industries 0.25% 5,000 $1.6M Reduce -93.2%
MTZ Mastec Inc. 0.25% 5,000 $1.6M Reduce -66.7%
ALDX Aldeyra Therapeutics Inc. 0.24% 950,000 $1.6M Reduce -34.5%
EQT Eqt Corp. 0.24% 25,000 $1.6M No change
EOSE Eos Energy Enterprises Inc. 0.23% 300,000 $1.5M Reduce -46.0%
DT Dynatrace Inc. 0.23% 40,000 $1.5M New
ET Energy Transfer LP 0.22% 75,000 $1.4M Add +200.0%
STKL Sunopta Inc. 0.22% 220,000 $1.4M Reduce -68.1%
CEG Constellation Energy 0.21% 5,000 $1.4M New
ITRI Itron Inc. 0.20% 15,000 $1.3M Add +7.1%
ESOA Energy Services of America 0.20% 100,000 $1.3M Add +100.0%
SPWR Sunpower Inc. 0.19% 960,000 $1.2M Add +84.6%
PI Impinj Inc. 0.18% 11,500 $1.2M Add +76.9%
TXN Texas Instruments Inc. 0.18% 6,000 $1.2M Reduce -90.0%
XLF SS Financial Select Sector 0.17% 23,000 $1.1M New
LODE Comstock Inc. 0.16% 350,000 $1.1M New
MGNI Magnite Inc. 0.14% 78,000 $927K New
PLXS Plexus Corp. 0.14% 4,500 $911K New
CRTO Criteo SA-Spon 0.14% 50,500 $905K New
AMSC American Superconductor Corp. 0.13% 25,000 $846K New
MP MP Materials Corp. 0.11% 15,000 $724K New
ARRY Array Technologies Inc. 0.11% 100,000 $723K Add +300.0%
HIMX Himax Technologies Inc.-ADR 0.09% 79,000 $622K New
S Sentinelone Inc. Class A 0.09% 46,000 $592K New
DIS The Walt Disney Co. filed as DISNEY WALT CO 0.09% 6,000 $578K New
TASK Taskus Inc. Class A 0.07% 65,000 $436K New
LXU LSB Industries Inc. 0.06% 25,000 $373K New
RAMP Liveramp Holdings Inc. 0.06% 14,000 $371K New
IE Ivanhoe Electric Inc. / US 0.04% 25,000 $296K New
FCEL Fuelcell Energy Inc. 0.04% 45,000 $294K New
ALB Albemarle Corp. 0.04% 1,500 $269K New
BIOX Bioceres Crop Solutions Corp. 0.03% 475,000 $211K No change
TDC Teradata Corp. 0.03% 8,000 $205K New

Options reported separately and not counted above: SPY calls ($31.9M), AVGO calls ($15.5M), AMZN calls ($10.0M), BKD calls ($9.4M), SNDK calls ($8.3M), AAPL puts ($7.6M), MU calls ($5.7M), EQIX calls ($3.9M), HPE puts ($3.7M), ANET calls ($3.1M), DOCN puts ($3.0M), COHR puts ($2.4M), and 22 more.

Portfolio Sells Q4 2025 → Q1 2026

LLY Eli Lilly & Co. Reduce -87.5% 0.70% −4.77
FSLR First Solar Inc. Sold out 0.00% −3.91
LITE Lumentum Holdings Inc. Reduce -92.3% 0.66% −3.09
ARGX Argenx SE - ADR Sold out 0.00% −2.57
SLV iShares Silver Trust Sold out 0.00% −2.42
TEL Te Connectivity PLC Sold out 0.00% −2.13
AEIS Advanced Energy Industries Reduce -93.2% 0.25% −1.70
SHOP Shopify Inc. Class A Sold out 0.00% −1.61
GSM Ferroglobe PLC Sold out 0.00% −1.25
SMIN iShares MSCI India Small-Cap Sold out 0.00% −1.25
TXN Texas Instruments Inc. Reduce -90.0% 0.18% −1.15
TER Teradyne Inc. Reduce -87.5% 0.34% −1.14
RUN Sunrun Inc. Reduce -23.3% 2.34% −1.12
CRM Salesforce Inc. Sold out 0.00% −1.11
MDB Mongodb Inc. Sold out 0.00% −1.11
JAZZ Jazz Pharmaceuticals PLC Sold out 0.00% −1.08
HUT Hut 8 Corp. Reduce -58.3% 1.07% −1.03
GOOG Alphabet Inc. Class C Reduce -47.4% 1.31% −0.97
PANW Palo Alto Networks Inc. Sold out 0.00% −0.94
MSFT Microsoft Corp. Reduce -64.0% 0.45% −0.92
ONTO Onto Innovation Inc. Sold out 0.00% −0.87
SANM Sanmina Corp. Sold out 0.00% −0.86
NXE Nexgen Energy Ltd. Reduce -73.3% 0.53% −0.79
ORCL Oracle Corp. Sold out 0.00% −0.74
ALDX Aldeyra Therapeutics Inc. Reduce -34.5% 0.24% −0.71
RH RH Sold out 0.00% −0.68
NVDA Nvidia Corp. Reduce -30.0% 2.32% −0.64
DNN Denison Mines Corp. Reduce -65.8% 0.75% −0.64
THC Tenet Healthcare Corp. Sold out 0.00% −0.63
OWL Blue Owl Capital Inc. Sold out 0.00% −0.62
EOSE Eos Energy Enterprises Inc. Reduce -46.0% 0.23% −0.58
BKR Baker Hughes Co. Sold out 0.00% −0.49
NOK Nokia Corp.-Spon ADR Sold out 0.00% −0.47
DECK Deckers Outdoor Corp. Sold out 0.00% −0.46
ABNB Airbnb Inc. Class A Sold out 0.00% −0.45
NXPI NXP Semiconductors NV Sold out 0.00% −0.40
TE T1 Energy Inc. Sold out 0.00% −0.39
BRBR Bellring Brands Inc. Reduce -27.1% 0.43% −0.39
HAL Halliburton Co. Sold out 0.00% −0.36
DQ Daqo New Energy Corp.-ADR Sold out 0.00% −0.32
MELI MercadoLibre Inc. Sold out 0.00% −0.31
BE Bloom Energy Corp. Class A Reduce -74.5% 0.27% −0.30
AGI Alamos Gold Inc. Class A Reduce -41.7% 1.18% −0.29
SLNH Soluna Holdings Inc. Sold out 0.00% −0.26
NEE Nextera Energy Inc. Sold out 0.00% −0.26
CTSH Cognizant Tech Solutions-A Sold out 0.00% −0.23
TWLO Twilio Inc. Class A Reduce -24.5% 0.90% −0.23
TRIP Tripadvisor Inc. Sold out 0.00% −0.21
SNAP Snap Inc. Class A Sold out 0.00% −0.21
AFRM Affirm Holdings Inc. Sold out 0.00% −0.20

Portfolio Buys Q4 2025 → Q1 2026

UTHR United Therapeutics Corp. New 4.52% +4.52
MOD Modine Manufacturing Co. Add +2430.6% 3.01% +2.95
META Meta Platforms Inc. Class A Add +1300.0% 2.44% +2.27
SHLS Shoals Technologies Group -A Add +8940.0% 2.27% +2.24
AMZN Amazon.com Inc. Add +96.3% 3.36% +1.78
AMLP Alerian MLP ETF New 1.60% +1.60
ANET Arista Networks Inc. Add +73.7% 3.25% +1.58
BSX Boston Scientific Corp. New 1.43% +1.43
AMAT Applied Materials Inc. New 1.30% +1.30
EQIX Equinix Inc. New 1.19% +1.19
ZM Zoom Communications Inc. New 1.02% +1.02
EBAY eBay Inc. Add +65.3% 1.95% +1.01
VZ Verizon Communications Inc. New 0.99% +0.99
ALK Alaska Air Group Inc. New 0.92% +0.92
NOW ServiceNow Inc. Add +511.8% 1.15% +0.92
SEZL Sezzle Inc. Add +22.4% 2.89% +0.91
CIFR Cipher Digital Inc. New 0.88% +0.88
BOX Box Inc. Class A New 0.85% +0.85
OKTA Okta Inc. New 0.81% +0.81
SMTC Semtech Corp. Add +9.2% 3.03% +0.81
SKE Skeena Resources Ltd. New 0.79% +0.79
ADI Analog Devices Inc. New 0.78% +0.78
MU Micron Technology Inc. New 0.72% +0.72
ATEX Anterix Inc. New 0.64% +0.64
ADMA Adma Biologics Inc. New 0.58% +0.58
HON Honeywell International Inc. New 0.57% +0.57
AVY Avery Dennison Corp. Add +90.5% 1.05% +0.57
BKD Brookdale Senior Living Inc. New 0.52% +0.52
AVGO Broadcom Inc. Add +6.5% 4.22% +0.52
NFLX Netflix Inc. Add +566.7% 0.59% +0.51
XLU St Sr Utl SL SE SPDR ETF-Usd Add +50.0% 1.05% +0.50
ROKU Roku Inc. Add +361.1% 0.60% +0.47
ARM Arm Holdings PLC-ADR New 0.41% +0.41
FLNC Fluence Energy Inc. New 0.39% +0.39
NET Cloudflare Inc. Class A New 0.34% +0.34
ENPH Enphase Energy Inc. Add +126.7% 0.49% +0.34
RSP Invesco S&P 500 Equal Weight New 0.32% +0.32
AMPX Amprius Technologies Inc. New 0.32% +0.32
FTNT Fortinet Inc. New 0.32% +0.32
UPWK Upwork Inc. New 0.32% +0.32
FFIV F5 Inc. New 0.31% +0.31
METC Ramaco Resources Inc. Class A Add +433.3% 0.38% +0.31
DIOD Diodes Inc. New 0.31% +0.31
UBER Uber Technologies Inc. New 0.27% +0.27
TAC Transalta Corp. Add +52.8% 0.55% +0.26
AMD Advanced Micro Devices New 0.25% +0.25
DT Dynatrace Inc. New 0.23% +0.23
CEG Constellation Energy New 0.21% +0.21
XIFR XPLR Infrastructure LP Add +5.6% 0.77% +0.20
TIC Tic Solutions Inc. Add +150.0% 0.38% +0.18

Options Activity Q4 2025 → Q1 2026

SPY SS SPDR S&P 500 ETF Trust-US call New 49,000 $31.9M
AMZN Amazon.com Inc. call New 48,000 $10.0M
ORCL Oracle Corp. call Sold out 48,000 $9.4Mbefore exit
ARM Arm Holdings PLC-ADR call Sold out 85,000 $9.3Mbefore exit
SNDK Sandisk Corp. call New 13,000 $8.3M
AAPL Apple Inc. put New 30,000 $7.6M
ABNB Airbnb Inc. Class A call Sold out 55,000 $7.5Mbefore exit
ICLN iShares Global Clean Energy call Sold out 450,000 $7.4Mbefore exit
TTD Trade Desk Inc./the Class A put Sold out 165,000 $6.3Mbefore exit
MU Micron Technology Inc. call New 17,000 $5.7M
PANW Palo Alto Networks Inc. call Sold out 29,000 $5.3Mbefore exit
TAN Invesco Solar ETF call Sold out 100,000 $4.9Mbefore exit
CRM Salesforce Inc. call Sold out 18,000 $4.8Mbefore exit
DELL Dell Technologies -C put Sold out 36,000 $4.5Mbefore exit
EQIX Equinix Inc. call New 4,000 $3.9M
HPE Hewlett Packard Enterprise put New 155,000 $3.7M
KWEB Kranesh Csi China Internet call Sold out 100,000 $3.4Mbefore exit
ANET Arista Networks Inc. call Reduce -37.5% 25,000 $3.1M
DOCN Digitalocean Holdings Inc. put New 35,000 $3.0M
SANM Sanmina Corp. call Sold out 20,000 $3.0Mbefore exit
FSLR First Solar Inc. call Sold out 10,000 $2.6Mbefore exit
INFY Infosys Ltd.-SP ADR put Sold out 140,000 $2.5Mbefore exit
COHR Coherent Corp. put Add +42.9% 10,000 $2.4M
ONTO Onto Innovation Inc. call Sold out 15,000 $2.4Mbefore exit
BOX Box Inc. Class A call New 100,000 $2.4M
SMTC Semtech Corp. call Add +36.4% 30,000 $2.3M
NFLX Netflix Inc. call Sold out 23,000 $2.2Mbefore exit
FTNT Fortinet Inc. call New 25,000 $2.0M
ZM Zoom Communications Inc. call New 23,000 $1.8M
GLW Corning Inc. put Sold out 20,000 $1.8Mbefore exit
NVDA Nvidia Corp. call New 10,000 $1.7M
TRIP Tripadvisor Inc. call Sold out 100,000 $1.5Mbefore exit
MOS The Mosaic Co. call New 50,000 $1.3M
NOW ServiceNow Inc. call Reduce -54.7% 12,000 $1.3M
TASK Taskus Inc. Class A call New 170,000 $1.1M
CNXC Concentrix Corp. put New 40,000 $1.1M
DQ Daqo New Energy Corp.-ADR call Reduce -66.7% 50,000 $1.1M
XLF SS Financial Select Sector call New 20,000 $987K
MRVL Marvell Technology Inc. put Sold out 10,000 $850Kbefore exit
INTC Intel Corp. call Reduce -70.0% 18,000 $794K
MGNI Magnite Inc. call New 65,000 $772K
EXLS Exlservice Holdings Inc. put New 25,000 $761K
RAMP Liveramp Holdings Inc. call New 28,000 $743K
LSCC Lattice Semiconductor Corp. call New 7,000 $649K
SEZL Sezzle Inc. call Sold out 10,000 $635Kbefore exit
HIMX Himax Technologies Inc.-ADR call New 80,000 $630K
TWLO Twilio Inc. Class A call New 5,000 $629K
ALDX Aldeyra Therapeutics Inc. call Add +500.0% 300,000 $507K
OKTA Okta Inc. call New 5,000 $394K
TDC Teradata Corp. call New 10,000 $256K

Showing the first 50 of 51.

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