Ardsley Advisory Partners Lp
- Regulatory AUM
- $1.6B
- Discretionary
- $1.6B
- Clients
- 11
- Avg AUM / client
- $149M
- Accounts
- 11
- Employees
- 11
AUM over time
Annual snapshots from Form ADV filings · as of May 06, 2026
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Pooled investment vehicles (non-investment companies) | 9 | $1.4B | 87.2% |
| Other | 2 | $209M | 12.8% |
Private funds (6)
Reported in Form ADV Section 7.B.(1), filing of Jan 2024 · $831M combined gross assets
| Fund | Type | Domicile | Gross assets | Owners |
|---|---|---|---|---|
| Ardsley Partners Advanced Healthcare Fund, L.P. | Hedge Fund | Delaware | $299M | 4 |
| Ardsley Sustainable Opportunities Fund, L.P. | Hedge Fund | Delaware | $283M | 40 |
| Ardsley World Information Technology Fund, L.P. | Hedge Fund | Delaware | $108M | 6 |
| Ardsley Partners Fund Ii, Lp | Hedge Fund | Delaware | $60.5M | 11 |
| Ardsley Duckdive Fund Lp | Hedge Fund | Delaware | $53.9M | 5 |
| Ardsley Ridgecrest Partners Fund, L.P. | Hedge Fund | Delaware | $25.8M | 4 |
People (6)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Hempleman, Philip, Jay | Limited Partner | Dec 1986 (40y) | 50% – 75% | |
| Gorman, George, Arthur | Limited Partner | Mar 1994 (32y) | Less than 5% | |
| Balzer, Kirk, Daniel | Limited Partner | Jan 1998 (29y) | 10% – 25% | |
| Napoli, Steven, Nicholas | Limited Partner, Chief Financial Officer, Chief Compliance Officer | Nov 2001 (25y) | Less than 5% | |
| Hempleman, Spencer, Jay | Limited Partner | Jan 2006 (21y) | ≈ 0% – 3.75% via Ardsley Advisory Partners Gp Llc | |
| Block, Benjamin, Ian | Limited Partner | Jun 2007 (19y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Ardsley Advisory Partners Gp Llc | General Partner | Nov 2018 | A | Less than 5% |
Undisclosed: 0% – 30% of the firm is not attributable from the filed Schedule A bands.
Estimated effective ownership (look-through of filed bands):
- Hempleman, Spencer, Jay: 50% – 75% of Ardsley Advisory Partners Gp Llc × 0% – 5% direct ≈ 0% – 3.75% of the firm
Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.
Private funds (6, $831M gross assets)
| Fund | Type | Gross assets | Min. investment | Owners |
|---|---|---|---|---|
| Ardsley Partners Advanced Healthcare Fund, L.P. | Hedge Fund | $299M | $1.0M | 4 |
| Ardsley Sustainable Opportunities Fund, L.P. | Hedge Fund | $283M | $1.0M | 40 |
| Ardsley World Information Technology Fund, L.P. | Hedge Fund | $108M | $1.0M | 6 |
| Ardsley Partners Fund Ii, Lp | Hedge Fund | $60.5M | $1.0M | 11 |
| Ardsley Duckdive Fund Lp | Hedge Fund | $53.9M | $1.0M | 5 |
| Ardsley Ridgecrest Partners Fund, L.P. | Hedge Fund | $25.8M | $1.0M | 4 |
From Form ADV Section 7.B private fund reporting.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 05/06/2026 | 2.41 MB | View · PDF · Source ↗ |
Archived copies of the firm's regulatory filings, versioned by content hash.
Disciplinary disclosures
No disciplinary events reported on the firm's latest Form ADV filing.
How they charge
- • Percentage of assets under management
- • Performance-based fees
Services
- • Portfolio management for pooled investment vehicles
- • Portfolio management for businesses/institutional clients
Custody
Reported custodians
- Morgan Stanley $798M (49% of AUM) May 2026
- Cowen Prime Services Llc $23.3M (2% of AUM) Mar 2021
Amounts as reported in ADV Item 5.K.(3) (custodians holding 10%+ of SMA assets).
Firm reports having custody of client funds or securities (Item 9.A).
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: May 06, 2026.
View current Form ADV (SEC/IAPD) ↗