One William Street Capital Management
Hedge Fund SEC-registered adviser
Legal name: One William Street Capital Management, LP.
New York, NY Website
AUM
$11.3B
Regulatory AUM
Private funds
8
Hedge Fund 6 · Private Equity 2
Private fund assets
$11.3B
Gross asset value
Employees
124
Last Form D raise
Jun 2026
Most recent fund filing
From SEC Form ADV filing (filed Mar 31, 2026). View on SEC
People(5)
Owners and executive officers named on the firm's SEC Form ADV.
D
F
H
J
K
Funds(8)
Private funds reported on Form ADV, with amounts raised from the funds' SEC Form D filings.
| Fund | Type | Gross assets | Raised (Form D) | Investors | Last Form D | Recency |
|---|---|---|---|---|---|---|
| Ows Affirm Partnership Fund, LTD. | Private Equity | $51.5M | $50.0M | 3 | Jun 2026 | Hot |
| One William Street Capital Master Fund, LTD. | Hedge Fund | $6.2B | $322.2M | 9 | Mar 2026 | Warm |
| Ows Lsar Master Fund, L.P. | Hedge Fund | $1.1B | $23.8M | 4 | Feb 2026 | Warm |
| Ows Abs IV, LP | Hedge Fund | $766.1M | $325.2M | 1 | Dec 2025 | Warm |
| Ows Credit Opportunity Master Fund, LTD. | Hedge Fund | $2.0B | $275.0M | 1 | Dec 2025 | Warm |
| Ows Abs Fund VIII, LTD. | Hedge Fund | $378.1M | $5.9M | 1 | May 2024 | Cold |
| Ows Abs Master Fund II, LP | Hedge Fund | $865.5M | — | — | — | |
| Ows Abs Master Fund II, LP, Class Bb Shares | Private Equity | — | — | — | — |
Board seats
Companies whose SEC Form D filings name one of this firm's people as a director, matched by name and office ZIP code.
No board seats matched from SEC filings yet.
Regulatory identifiers
- CRD number
- 150522
- SEC file number
- 801-70264
Sources
- SEC Form ADV Oct 14, 2026