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ONE WILLIAM STREET CAPITAL MANAGEMENT, LP.
CRD 150522File 801-70264
APPROVED
Custody
Filing as of Mar 31, 2026
Feed vintage Oct 1, 2026
Regulatory AUM
$11.30B
Top 10% of cohort (national)
Discretionary AUM
$11.30B
Clients
21
22 accounts
Employees
124
Top 25% of cohort in NY
Identity & registration
ADV Item 1- Organization form
- Limited Partnership
- Firm type
- Registered
- SEC region
- NYRO
- Registration date
- Jun 22, 2009
- Principal office
- 299 PARK AVENUE, 25TH FLOOR, NEW YORK, NY, 10171
- Phone
- 212-957-2500
Assets & accounts
ADV Item 5F- Total regulatory AUM
- $11.30B
- Discretionary AUM
- $11.30B
- Non-discretionary AUM
- $0
- Discretionary accounts
- 22
- Non-discretionary accounts
- 0
- Total accounts
- 22
- AUM per client
- $538.2M
Clients by type
ADV Item 5D| Client type | Clients | AUM |
|---|---|---|
| Pooled investment vehicles | 21 | $11.30B |
| Pension and profit sharing plans | Fewer than 5 | $2.3M |
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 | Change |
|---|---|---|---|---|
| Apr 1, 2026 | Employees | 110 | 124 | increased by14 |
| Apr 1, 2026 | Clients | 22 | 21 | decreased by1 |
| Apr 1, 2026 | AUM | $10,791,180,746 | $11,302,484,622 | increased by$511,303,876 |
| Apr 1, 2026 | Accounts | 23 | 22 | decreased by1 |
| May 1, 2025 vs Oct 1, 2022 | Employees | 87 | 110 | increased by23 |
| May 1, 2025 vs Oct 1, 2022 | Clients | 21 | 22 | increased by1 |
| May 1, 2025 vs Oct 1, 2022 | AUM | $7,968,913,751 | $10,791,180,746 | increased by$2,822,266,995 |
| May 1, 2025 vs Oct 1, 2022 | Accounts | 22 | 23 | increased by1 |
| Apr 1, 2022 | Employees | 75 | 87 | increased by12 |
| Apr 1, 2022 | Clients | 24 | 21 | decreased by3 |
| Apr 1, 2022 | AUM | $7,676,777,161 | $7,968,913,751 | increased by$292,136,590 |
| Apr 1, 2022 | Accounts | 26 | 22 | decreased by4 |
| Apr 1, 2021 | Registration | — | APPROVED |
On Form 5500, an adviser usually appears as a plan service provider (Schedule C), not the plan sponsor.
See plans that list “ONE WILLIAM” as a service provider on 5500mcp →Matched by name only — Form ADV and Form 5500 share no identifier, and names are searched loosely (“ONE WILLIAM” may also match similarly-named firms). Confirm identity against each filing.
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.