One William Street Capital Management, L.P. holds a concentrated book of 12 stocks worth $42.3M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened KKR Real Estate Finance Trus and trimmed Flagstar Bank Na. Their largest long position is Invesco Senior Loan ETF at 37% of the equity book. They also disclosed $128.2M in put options (a bearish bet) and $72.0M in call options (bullish), shown separately below and excluded from the equity book.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
49% mapped to company sectors
+1 sector below the cut, under 0.5% together
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as One William Street Capital Management, L.P.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Financial Advisory Partners, LLC | 2 / 12 | $61.6M |
| Legacy Edge Advisors, LLC | 2 / 12 | $113.7M |
| Long Pond Capital, LP | 2 / 12 | $98.6M |
| DecisionPoint Financial, LLC | 3 / 12 | $49.4M |
| GRS Advisors, LLC | 3 / 12 | $78.2M |
| Crabel Capital Management, LLC | 2 / 12 | $9.8M |
| RFG Holdings, Inc. | 2 / 12 | $29.4M |
| Cordant, Inc. | 2 / 12 | $15.6M |
Ranked by the share of each fund's own book sitting in the names it shares with One William Street Capital Management, L.P.: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Invesco Exch Traded FD TR II SR LN ETF | $15.7M | 771.0K | 37.1% | ▲+6.3% Added · +46K sh | |
| 2 | TPG Re Fin TR Inc COM | $9.0M | 1.07M | 21.2% | —Held | |
| 3 | Vanguard Scottsdale FDS INT-TERM CORP | $5.9M | 71.7K | 14.0% | —Held | |
| 4 | Flagstar Bank National Assoc COM NEW | $2.3M | 156.0K | 5.5% | ▼−61% Reduced · −244K sh | |
| 5 | Apollo Coml Real Estate Fin COM | $2.1M | 200.0K | 5.0% | —Held | |
| 6 | Starwood Ppty TR Inc COM | $1.9M | 114.0K | 4.4% | —Held | |
| 7 | Blackstone Mortgage Trust In COM CL A | $1.7M | 100.0K | 4.0% | —Held | |
| 8 | KKR Real Estate Fin TR Inc COM | $1.4M | 202.0K | 3.3% | ▲New New position | |
| 9 | Service Pptys TR COM SH BEN INT | $1.1M | 630.0K | 2.5% | ▲New New position | |
| 10 | Cousins Pptys Inc COM NEW | $617K | 20.6K | 1.5% | ▼−90% Reduced · −180K sh | |
| 11 | Rocket Cos Inc COM CL A | $603K | 38.3K | 1.4% | ▼−76% Reduced · −120K sh | |
| 12 | New Fortress Energy Inc COM CL A | $15K | 42.6K | <0.1% | —Held |
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1534300/holdings"
Use Arkolith to show One William Street Capital Management, L.P.'s latest holdings, largest changes, and filing provenance.
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | ISHR IBX USD HIYLD CB ETF-UIHYG | $120.0M | 1.5M |
| CALL · bullish | ISHR IBX USD HIYLD CB ETF-UIHYG | $72.0M | 900K |
| PUT · bearish | ISHARES RUSSELL 2000 ETFIWM | $8.3M | 28K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.