DOSSIER · 13F-HR · Q2 2026

ARDSLEY ADVISORY PARTNERS LP

$960M in tracked AUM across 145 positions as of Q2 2026.

AA
CIK 0000900529 · last filed Jun 30, 2026
Total AUM
$960M
as of Q2 2026
Holdings
145
positions
Whale Score
54
54
tracked
Activity
no data
changes this Q
AI Analysis · Q2 2026

Ardsley Advisory Partners cut its SanDisk share count by 54.5% this quarter (55,000 down to 25,000 shares) — a real, more-than-halved reduction — yet the position's dollar value actually rose from $35.0 million to $56.7 million and remains the fund's largest holding, because SanDisk's price more than tripled over the same period. The share-flow figure of -$68.0 million is the only number that shows what really happened. Turnover elsewhere was extreme: 24 positions opened, 24 closed, including a new $54.0 million AMD stake and an 84.9% cut to Broadcom (139,500 to 21,000 shares, -$44.7 million in flow terms). NVIDIA, Meta, and Arista Networks were all fully exited.

Extreme turnover across the book

SanDisk's disguised sale sits inside a quarter of genuinely extreme turnover: 24 positions opened, 24 closed, out of 145 total holdings — roughly a third of the book changed identity in three months. A new $54.0 million stake in AMD is the single largest new position, alongside ARM Holdings ($16.6 million) and Palo Alto Networks ($14.6 million).

Quarter at a glance — Q2 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q2 2026.

#HoldingValueSharesWeight
01
SNDK
SANDISK CORP
$57M25K5.9%
02
AMD
ADVANCED MICRO DEVICES INC
$54M93K5.6%
03
SEZL
SEZZLE INC
$37M215K3.8%
04
WULF
TERAWULF INC
$24M966K2.5%
05
BTSG
BRIGHTSPRING HEALTH SVCS INC
$23M325K2.4%
06
EBAY
EBAY INC.
$22M201K2.3%
07
RUN
SUNRUN INC
$21M1.6M2.2%
08
PSTG
EVERPURE INC
$21M263K2.2%
09
VIAV
VIAVI SOLUTIONS INC
$19M390K1.9%
10
ARM
ARM HOLDINGS PLC
$17M47K1.7%

Filing history

2026Q2Jun 30
$960M 22.4%
145 positionsView →
2026Q1Mar 31
$784M 13.9%
151 positionsView →
2025Q4Dec 31
$911M 88.2%
142 positionsView →
2025Q3Sep 30
$484M 36.3%
80 positionsView →
2025Q2Jun 30
$761M 127.5%
145 positionsLocked
2025Q1Mar 31
$334M 47.0%
99 positionsLocked
2024Q4Dec 31
$631M 3.7%
143 positionsLocked
2024Q3Sep 30
$608M 10.7%
128 positionsLocked
2024Q2Jun 30
$681M 2.2%
140 positionsLocked
2024Q1Mar 31
$696M 7.4%
124 positionsLocked
2023Q4Dec 31
$648M 44.7%
138 positionsLocked
2023Q3Sep 30
$448M 24.3%
114 positionsLocked
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