Institutional Manager · CIK 0000900529
ARDSLEY ADVISORY PARTNERS LP
Norwalk, CT · File #028-04639
Latest AUM
$911.1M
Positions
142
Top-10 Concentration
38.0%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| NEW | ELI LILLY & CO | LLY | +40,000 | +$43.0M | $0 |
| REDUCE | MARVELL TECHNOLOGY INC | MRVL | -405,000 | -$34.4M | +$377,650 |
| REDUCE | FIRST SOLAR INC | FSLR | -119,000 | -$31.1M | +$5.3M |
| REDUCE | HUT 8 CORP | HUT | -440,000 | -$20.2M | +$8.9M |
| NEW | TE CONNECTIVITY PLC | TEL | +73,500 | +$16.7M | $0 |
| REDUCE | CORNING INC | GLW | -147,878 | -$12.9M | +$928,366 |
| EXITED | SILICON MOTION TECHNOLOGY CO | 82706C108 | -133,000 | -$12.6M | $0 |
| REDUCE | EOS ENERGY ENTERPRISES INC | EOSE | -1,045,000 | -$12.0M | +$191,840 |
| REDUCE | APPLIED OPTOELECTRONICS INC | AAOI | -339,500 | -$11.8M | +$3.1M |
| REDUCE | SANDISK CORP | SNDK | -44,000 | -$10.4M | +$12.5M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025142 pos · $911.1M
- 13F HOLDINGS REPORTQ/E Sep 2025130 pos · $808.7M
- 13F HOLDINGS REPORTQ/E Jun 2025145 pos · $760.6M
- 13F HOLDINGS REPORTQ/E Mar 2025139 pos · $522.4M
- 13F HOLDINGS REPORTQ/E Dec 2024143 pos · $630.6M
- 13F HOLDINGS REPORTQ/E Sep 2024128 pos · $608.0M
- 13F HOLDINGS REPORTQ/E Jun 2024140 pos · $680.8M
- 13F HOLDINGS REPORTQ/E Mar 2024124 pos · $696.1M
- 13F HOLDINGS REPORTQ/E Dec 2023114 pos · $447.9M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | ELI LILLY & CO | LLY | 40,000 | $43.0M | 6.34% |
| 2 | FIRST SOLAR INC | FSLR | 117,500 | $30.7M | 4.53% |
| 3 | LUMENTUM HLDGS INC | LITE | 80,000 | $29.5M | 4.35% |
| 4 | BROADCOM INC | AVGO | 84,000 | $29.1M | 4.29% |
| 5 | SUNRUN INC | RUN | 1,480,000 | $27.2M | 4.02% |
| 6 | NVIDIA CORPORATION | NVDA | 125,000 | $23.3M | 3.44% |
| 7 | ARGENX SE | ARGX | 24,000 | $20.2M | 2.98% |
| 8 | ISHARES SILVER TR | SLV | 295,000 | $19.0M | 2.80% |
| 9 | TEVA PHARMACEUTICAL INDS LTD | 881624209 | 580,000 | $18.1M | 2.67% |
| 10 | ALPHABET INC | GOOG | 57,000 | $17.9M | 2.64% |
| 11 | SEMTECH CORP | SMTC | 237,000 | $17.5M | 2.58% |
| 12 | BROADCOM INC | AVGO | 50,000 | $17.3M | 2.55% |
| 13 | TE CONNECTIVITY PLC | TEL | 73,500 | $16.7M | 2.47% |
| 14 | HUT 8 CORP | HUT | 360,000 | $16.5M | 2.44% |
| 15 | SEZZLE INC | SEZL | 245,000 | $15.6M | 2.29% |
| 16 | ADVANCED ENERGY INDS | 007973100 | 73,000 | $15.3M | 2.25% |
| 17 | TERAWULF INC | WULF | 1,165,000 | $13.4M | 1.97% |
| 18 | SANDISK CORP | SNDK | 56,000 | $13.3M | 1.96% |
| 19 | BRIGHTSPRING HEALTH SVCS INC | 10950A106 | 350,000 | $13.1M | 1.93% |
| 20 | ARISTA NETWORKS INC | ANET | 100,000 | $13.1M | 1.93% |