SEC 13F Intelligence

Managers / Q3 2025 · view latest →

ARDSLEY ADVISORY PARTNERS LP

CIK 0000900529 · 105 ROWAYTON AVE, NORWALK, CT, 06853 · 203-564-4230

Reported Value
$809M
Q3 2025
Positions
130
Filings on Record
31
2019–present window
Filed
Nov 14, 2025
original filing

Summary

Ardsley Advisory Partners LP reported $809M in U.S.-listed holdings across 130 positions for Q3 2025.

Its largest position, FSLR, represents 3.5% of the portfolio.

Compared with Q2 2025, the fund opened 49 new positions and exited 66.

Portfolio Metrics

Turnover
+51.0%
vs prior filed quarter
Top-10 Concentration
+26.7%
share of reported value
Largest Position
+3.5%
First Solar
New / Exited
49 / 66
positions this quarter

Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $398MQ4 ’18Q1 ’19: $521MQ2 ’19: $634MQ3 ’19: $446MQ4 ’19: $627MQ4 ’19Q1 ’20: $255MQ2 ’20: $470MQ3 ’20: $518MQ4 ’20: $609MQ4 ’20Q1 ’21: $822MQ2 ’21: $851MQ3 ’21: $656MQ4 ’21: $525MQ4 ’21Q1 ’22: $599MQ2 ’22: $608MQ3 ’22: $447MQ4 ’22: $483MQ4 ’22Q1 ’23: $455MQ2 ’23: $592MQ3 ’23: $448MQ4 ’23: $648MQ4 ’23Q1 ’24: $696MQ2 ’24: $681MQ3 ’24: $608MQ4 ’24: $631MQ4 ’24Q1 ’25: $522MQ2 ’25: $761MQ3 ’25: $809MQ4 ’25: $911MQ4 ’25Q1 ’26: $784Mfilingsflow.com

Portfolio Composition

By security type
Common Stock: 86.8%ADR: 8.8%ETP: 2.8%Other: 1.5%
  • Common Stock · 86.8% · $702M
  • ADR · 8.8% · $71M
  • ETP · 2.8% · $23M
  • Other · 1.5% · $12M

Quarter-over-Quarter Changes full breakdown →

vs Q2 2025 (amended baseline)

IssuerMoveShare ΔShares nowValue ΔValue now
EOSEEOS ENERGY ENTERPRISES INCNEW+1.60M1.60M+$18M$18M
LITELUMENTUM HLDGS INCNEW+86.0K86.0K+$14M$14M
AAOIAPPLIED OPTOELECTRONICS INCNEW+529.5K529.5K+$14M$14M
SIMOSILICON MOTION TECHNOLOGY CONEW+133.0K133.0K+$13M$13M
AGIALAMOS GOLD INC NEWNEW+325.0K325.0K+$11M$11M
SNDKSANDISK CORPNEW+100.0K100.0K+$11M$11M
ARGXARGENX SENEW+15.0K15.0K+$11M$11M
PPURE STORAGE INCNEW+120.0K120.0K+$10M$10M

Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.

Holdings — Q3 2025

44 positions
Export to Excel
#IssuerClass% PortfolioValue ↓Shares
1FSLRFIRST SOLAR INChistory →COM3.52%$28M129.0K
2HUTHUT 8 CORPhistory →COM3.44%$28M800.0K
3RUNSUNRUN INChistory →COM3.42%$28M1.60M
4ORCLORACLE CORPhistory →COM2.95%$24M85.0K
5AVGOBROADCOM INChistory →COM2.47%$20M60.5K
6MSFTMICROSOFT CORPhistory →COM2.36%$19M37.0K
7GOOGALPHABET INChistory →CAP STK CL C2.35%$19M78.0K
8EOSEEOS ENERGY ENTERPRISES INChistory →COM CL A2.24%$18M1.60M
9AMZNAMAZON COM INChistory →COM2.05%$17M75.5K
10ARMARM HOLDINGS PLChistory →SPONSORED ADS1.89%$15M108.0K
11NVDANVIDIA CORPORATIONhistory →COM1.82%$15M79.0K
12LITELUMENTUM HLDGS INChistory →COM1.73%$14M86.0K
13GLWCORNING INChistory →COM1.70%$14M167.9K
14WULFTERAWULF INChistory →COM1.70%$14M1.20M
15BTSGBRIGHTSPRING HEALTH SVCS INChistory →COM1.64%$13M450.0K
16SIMOSILICON MOTION TECHNOLOGY COhistory →SPONSORED ADR1.56%$13M133.0K
17SHOPSHOPIFY INChistory →CL A SUB VTG SHS1.53%$12M83.2K
18TERTERADYNE INChistory →COM1.50%$12M88.0K
19AGIALAMOS GOLD INC NEWhistory →COM CL A1.40%$11M325.0K
20SNDKSANDISK CORPhistory →COM1.39%$11M100.0K
21ARGXARGENX SEhistory →SPONSORED ADR1.37%$11M15.0K
22TEVATEVA PHARMACEUTICAL INDS LTDhistory →SPONSORED ADS1.25%$10M500.0K
23NU HLDGS LTDORD SHS CL A1.24%$10M625.0K
24ALDXALDEYRA THERAPEUTICS INChistory →COM1.23%$10M1.90M
25OKTAOKTA INChistory →CL A1.20%$10M106.0K
26AAOIAPPLIED OPTOELECTRONICS INChistory →COM1.18%$10M364.5K
27XIFRXPLR INFRASTRUCTURE LPhistory →COM UNIT PART IN1.11%$9M880.0K
28RIOTRIOT PLATFORMS INChistory →COM1.06%$9M450.0K
29SLVISHARES SILVER TRhistory →ISHARES1.05%$8M200.0K
30LSCCLATTICE SEMICONDUCTOR CORPhistory →COM1.04%$8M114.5K
31PPURE STORAGE INChistory →CL A1.04%$8M100.0K
32MIRMIRION TECHNOLOGIES INCCOM CL A0.94%$8M328.2K
33AEISADVANCED ENERGY INDSCOM0.94%$8M44.5K
34CVSCVS HEALTH CORPCOM0.93%$8M100.0K
35BWXTBWX TECHNOLOGIES INCCOM0.91%$7M40.0K
36THCTENET HEALTHCARE CORPCOM NEW0.88%$7M35.0K
37OSCROSCAR HEALTH INCCL A0.88%$7M375.0K
38WGSGENEDX HOLDINGS CORPCOM CL A0.80%$6M60.0K
39PANWPALO ALTO NETWORKS INCCOM0.79%$6M31.3K
40ADMAADMA BIOLOGICS INCCOM0.77%$6M425.0K
41STKLSUNOPTA INCCOM0.74%$6M1.02M
42APPAPPLOVIN CORPCOM CL A0.71%$6M8.0K
43SMTCSEMTECH CORPCOM0.71%$6M80.0K
44FLRFLUOR CORP NEWCOM0.70%$6M135.0K

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$784M151May 15, 202613F-HRchanges · EDGAR ↗
Q4 2025$911M142Feb 17, 202613F-HRchanges · EDGAR ↗
Q3 2025$809M130Nov 14, 202513F-HRchanges · EDGAR ↗
Q2 2025$761M145Aug 14, 202513F-HRchanges · EDGAR ↗
Q1 2025$522M139May 15, 202513F-HRchanges · EDGAR ↗
Q4 2024$631M143Feb 14, 202513F-HRchanges · EDGAR ↗
Q3 2024$608M128Nov 14, 202413F-HRchanges · EDGAR ↗
Q2 2024$681M140Aug 14, 202413F-HRchanges · EDGAR ↗
Q1 2024$696M124May 15, 202413F-HRchanges · EDGAR ↗
Q4 2023$648M138Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$448M114Nov 14, 202313F-HRchanges · EDGAR ↗
Q2 2023$592M121Aug 14, 202313F-HRchanges · EDGAR ↗
Q1 2023$455M101May 15, 202313F-HRchanges · EDGAR ↗
Q4 2022$483M119Feb 14, 202313F-HRchanges · EDGAR ↗
Q3 2022$447M103Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$608M124Aug 15, 202213F-HRchanges · EDGAR ↗
Q1 2022$599M126May 16, 202213F-HRchanges · EDGAR ↗
Q4 2021$525M106Feb 14, 202213F-HRchanges · EDGAR ↗
Q3 2021$656M126Nov 15, 202113F-HRchanges · EDGAR ↗
Q2 2021$851M130Aug 16, 202113F-HRchanges · EDGAR ↗
Q1 2021$822M123May 17, 202113F-HRchanges · EDGAR ↗
Q4 2020$609M128Feb 16, 202113F-HRchanges · EDGAR ↗
Q3 2020$518M145Nov 13, 202013F-HRchanges · EDGAR ↗
Q2 2020$470M132Aug 14, 202013F-HRchanges · EDGAR ↗
Q1 2020$255M101May 15, 202013F-HRchanges · EDGAR ↗
Q4 2019$627M150Feb 14, 202013F-HRchanges · EDGAR ↗
Q3 2019$446M133Nov 14, 201913F-HRchanges · EDGAR ↗
Q2 2019$634M148Aug 15, 2019RESTATEMENTchanges · EDGAR ↗
Q1 2019$521M131May 15, 201913F-HRchanges · EDGAR ↗
Q4 2018$398M104Feb 14, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.