# One William Street Capital Management, LP.

> One William Street Capital Management, LP. is an SEC-registered investment advisory firm in New York, NY, registered since 2009, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 31, 2026.

- CRD: 150522
- Filed as: ONE WILLIAM STREET CAPITAL MANAGEMENT, LP.
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: New York, NY
- Filing period: October 2026
- Form ADV filing dated: March 31, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/150522
- AdvisorCensus page: https://advisorcensus.com/firm/one-william-street-capital-management-lp-new-york-ny-150522

## Quick answers

**How is One William Street Capital Management, LP. compensated?**
On its Form ADV (Item 5.E, October 2026), One William Street Capital Management, LP. reports these compensation arrangements: a percentage of assets under its management; performance-based fees. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is One William Street Capital Management, LP. located?**
One William Street Capital Management, LP.'s principal office is in New York, NY, according to its Form ADV.

**Is One William Street Capital Management, LP. registered with the SEC or a state?**
One William Street Capital Management, LP. is an SEC-registered investment advisory firm, registered since 2009. Status as filed: Approved. CRD 150522.

**How much does One William Street Capital Management, LP. manage?**
One William Street Capital Management, LP. reports $11,302,484,622 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (100% discretionary).

**How have One William Street Capital Management, LP.'s assets and staff changed since 2021?**
In the Form ADV data for One William Street Capital Management, LP.: Regulatory assets under management: $7,676,777,161 in the October 2021 data and $11,302,484,622 in the October 2026 data, up 47%. Total employees: 75 in October 2021 and 124 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does One William Street Capital Management, LP. serve?**
By number of clients on Form ADV Item 5.D: pooled investment vehicles (other than investment companies and business development companies) (21).

**Which custodians does One William Street Capital Management, LP. use?**
One William Street Capital Management, LP.'s most recent Form ADV filing (Schedule D, Section 5.K(3)) lists J.P. Morgan Securities LLC as a custodian holding 10% or more of its separately managed account assets.

**Does One William Street Capital Management, LP. report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/150522

**What changed in One William Street Capital Management, LP.'s recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 53 to 62. Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Performance-based fees

### Custodians (Schedule D, Section 5.K(3))
- J.P. Morgan Securities LLC

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $11,302,484,622
- Discretionary: $11,302,484,622
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 0 | $0 |
| High net worth individuals | 0 | $0 |
| Banking or thrift institutions | 0 | $0 |
| Investment companies | 0 | $0 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 21 | $11,300,174,677 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | Fewer than 5 | $2,309,945 |
| Charitable organizations | 0 | $0 |
| State or municipal government entities (including government pension plans) | 0 | $0 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 0 | $0 |
| Sovereign wealth funds and foreign official institutions | 0 | $0 |
| Corporations or other businesses not listed above | 0 | $0 |
| Other | 0 | $0 |

### Advisory services (Item 5.G)
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients

### Firm details
- Registered since: 2009 (17 years)
- Employees: 124 total, 62 performing advisory functions
- Wrap fee program participation: No
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- [onewilliamstreet.com](https://onewilliamstreet.com)
- [owslp.com](https://owslp.com)
- LinkedIn @ONE-WILLIAM-STREET-CAPITAL

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $7,676,777,161 | 75 | June 18, 2021 |
| October 2022 | $7,968,913,751 | 87 | July 1, 2022 |
| October 2023 | $8,108,843,527 | 96 | April 6, 2023 |
| October 2024 | $9,657,372,124 | 97 | March 27, 2024 |
| October 2025 | $10,791,180,746 | 110 | March 28, 2025 |
| October 2026 | $11,302,484,622 | 124 | March 31, 2026 |

Regulatory assets under management: $7,676,777,161 in the October 2021 data and $11,302,484,622 in the October 2026 data, up 47%.
Total employees: 75 in October 2021 and 124 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 53 to 62.
- Updated its list of owners and control persons (Schedule A).

### December 2025
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. One William Street Capital Management, LP. (CRD 150522): Form ADV filing data as of October 2026.