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ARDSLEY PARTNERS
Legal name: ARDSLEY ADVISORY PARTNERS LP
CRD 301116File 801-114966
APPROVED
Custody
Filing as of May 6, 2026
Feed vintage Aug 17, 2026
Regulatory AUM
$1.64B
Top 25% of cohort (national)
Discretionary AUM
$1.64B
Clients
9
11 accounts
Employees
11
Above cohort median in CT
Identity & registration
ADV Item 1- Organization form
- Limited Partnership
- Firm type
- Registered
- SEC region
- BRO
- Registration date
- Mar 27, 2019
- Principal office
- 105 ROWAYTON AVE., NORWALK, CT, 06853
- Phone
- 203-564-4200
- Website
- http://www.ardsley.com/
Assets & accounts
ADV Item 5F- Total regulatory AUM
- $1.64B
- Discretionary AUM
- $1.64B
- Non-discretionary AUM
- $0
- Discretionary accounts
- 11
- Non-discretionary accounts
- 0
- Total accounts
- 11
- AUM per client
- $181.7M
Clients by type
ADV Item 5D| Client type | Clients | AUM |
|---|---|---|
| Pooled investment vehicles | 9 | $1.43B |
Compensation & activities
ADV Items 5E, 5GCompensation
- Performance-based fees
- A percentage of assets under your management
Advisory activities
- Portfolio management for businesses
- Portfolio management for pooled investment vehicles
Custody
ADV Item 9- Firm Custody Cash
- Yes
- Firm Custody Assets
- Yes
- Firm Custody Clients
- Yes
- Firm Custody Securities
- Yes
- Related Person Custody Cash
- No
- Related Person Custody Assets
- No
- Related Person Custody Clients
- No
- Related Person Custody Securities
- Yes
Disclosure events
ADV Item 11This firm answered no to every Item 11 disclosure question in this filing.
Filed changes
| Date | Field | From | To |
|---|---|---|---|
| Aug 17, 2026 | Clients | 11 | 9 |
| Aug 12, 2026 | Registration | — | APPROVED |
Every value above is reproduced from this firm's Form ADV filing. Fields the firm left blank are shown as “Not reported” rather than filled in from other sources.