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One William Street Capital Management, L.P. Holdings Report (Q2 2026) — 13F Stock Portfolio
One William Street Capital Management, L.P.CIK: 0001534300
High-turnover traderConcentrated strategySector-focused
Total reported value
$242.5M
Reporting period: 2026-06-30 · Number of holdings: 15
One William Street Capital Management, L.P. disclosed 15 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $242.5M and a quarterly turnover rate of 132.6%.
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Personality snowflake
- Concentration
- 100
- Portfolio Stability
- 100
- Momentum
- 0
- Sector conviction
- 100
- Diversification
- 28
- Sizing Uniformity
- 70.87
One William Street Capital Management, L.P.'s disclosed holdings carry a Herfindahl concentration index of 0.634 — mathematically equivalent to about 2 equally-sized positions, well below its 15 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 2.91), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 3% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govTrim HYG
-82.0% -$867.5M
Add TRTX
0.0% $599.2K
Add IWM
-35.3% -$2.3M
Add VCIT
0.0% -$7.2K
Sold out SPY
Add BKLN
-71.7% -$39.9M
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
Showing top 14 holdings (of 15 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | HYG | Ishr Ibx Usd Hiyld Cb Etf-ui | ETF-High Yield | 79.15% | -10.70% | -81.98% | |
| 2 | BKLN | Invesco Senior Loan ETF | ETF-Other | 6.48% | +1.76% | -71.71% | |
| 3 | TRTX | Tpg Re Finance Trust Inc | Stock-Other | 3.69% | +2.98% | — | |
| 4 | IWM | Ishares Russell 2000 ETF | ETF-Small Cap | 3.41% | +2.52% | -35.29% | |
| 5 | VCIT | Vanguard Int-term Corporate | ETF-Corp Bonds | 2.44% | +1.94% | — | |
| 6 | FLG | Flagstar Bank NA | Stock-Financials | 0.96% | +0.51% | -61.00% | |
| 7 | ARI | Apollo Commercial Real Estat | Stock-Other | 0.88% | +0.70% | — | |
| 8 | STWD | Starwood Property Trust Inc | Stock-Real Estate | 0.77% | +0.60% | — | |
| 9 | BXMT | Blackstone Mortgage Tru-cl A | Stock-Real Estate | 0.70% | +0.54% | — | |
| 10 | KREF | Kkr Real Estate Finance Trus | Stock-Other | 0.57% | +0.57% | NEW | |
| 11 | SVC | Service Properties Trust | Stock-Other | 0.44% | +0.44% | NEW | |
| 12 | CUZ | Cousins Properties Inc | Stock-Real Estate | 0.25% | -0.13% | -89.73% | |
| 13 | RKT | Rocket Cos Inc-class A | Stock-Financials | 0.25% | +0.06% | -75.81% | |
| 14 | NFE | New Fortress Energy Inc | Stock-Other | 0.01% | +0.01% | — |
Portfolio Performance
Performance for Q3 2026
+0.7%
Performance Last 4 Quarters
+6.7%
- Stdev
- +10.1%
- Beta
- +0.59
- Alpha
- -5.7%
- Max Drawdown
- -8.4%
- Annualized Perf
- +5.7%
- Batting Avg vs S&P
- +25%
- Sortino
- +0.89
- Stutzer
- +0.17
- Treynor
- +0.1
- Sterling
- +0.37
- Calmar
- +0.68
- Information Ratio
- -1.63
- Tracking Error
- +8.5%
- Stdev Down
- +6.8%
- Winning Months %
- +66.7%
- Losing Months %
- +33.3%
- Best 12 Months
- +16.1%
- Worst 12 Months
- -0.2%
- Efficiency Ratio
- +0.23
- Sharpe
- +0.6
- Stdev Sectors
- +8.8%
- Skewness
- -0.51
- Kurtosis
- +0.54
- Upside Potential
- +2.4
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 15 | $242.5M | 100 | ||
| 2026 Q1 | 16 | $1.2B | 51 | ||
| 2025 Q4 | 8 | $745.4M | 92 | ||
| 2025 Q3 | 7 | $287.6M | 100 | ||
| 2025 Q2 | 7 | $54.3M | 0 | ||
| 2025 Q1 | 6 | $33.5M | 100 | ||
| 2024 Q4 | 8 | $213.3M | 0 | ||
| 2024 Q3 | 5 | $284.5M | 0 | ||
| 2024 Q2 | 3 | $145.7M | 0 | ||
| 2024 Q1 | 6 | $66.3M | 0 | ||
| 2023 Q4 | 12 | $701.6M | 0 | ||
| 2023 Q3 | 5 | $40.7M | 0 | ||
| 2023 Q2 | 7 | $25.8M | 0 | ||
| 2023 Q1 | 5 | $433.4M | 0 | ||
| 2022 Q4 | 7 | $104.8M | 0 | ||
| 2020 Q3 | 1 | $4.3M | 18 | ||
| 2020 Q2 | 1 | $3.6M | 8 | ||
| 2020 Q1 | 1 | $3.9M | 37 | ||
| 2019 Q4 | 1 | $5.7M | 7 | ||
| 2019 Q3 | 1 | $5.3M | 6 | ||
| 2019 Q2 | 1 | $5.7M | 100 | ||
| 2019 Q1 | 2 | $144.4M | 100 | ||
| 2018 Q4 | 5 | $34.4M | 0 |
Holding changes this quarter
One William Street Capital Management, L.P.'s most significant position changes for 2026-06-30: Sold out: Ss Spdr S&p 500 ETF Trust-us (SPY); New buy: Kkr Real Estate Finance Trus (KREF); New buy: Service Properties Trust (SVC); Trim: Ishr Ibx Usd Hiyld Cb Etf-ui (HYG) — shares -81.98%; Trim: Ishares Russell 2000 ETF (IWM) — shares -35.29%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | TRTX | Tpg Re Finance Trust Inc | +3% | — | Unchanged |
| 2 | IWM | Ishares Russell 2000 ETF | +2.5% | -35.29% | Trim |
| 3 | VCIT | Vanguard Int-term Corporate | +1.9% | — | Unchanged |
| 4 | BKLN | Invesco Senior Loan ETF | +1.8% | -71.71% | Trim |
| 5 | ARI | Apollo Commercial Real Estat | +0.7% | — | Unchanged |
| 6 | STWD | Starwood Property Trust Inc | +0.6% | — | Unchanged |
| 7 | KREF | Kkr Real Estate Finance Trus | +0.6% | NEW | New buy |
| 8 | BXMT | Blackstone Mortgage Tru-cl A | +0.5% | — | Unchanged |
| 9 | FLG | Flagstar Bank NA | +0.5% | -61.00% | Trim |
| 10 | SVC | Service Properties Trust | +0.4% | NEW | New buy |
| 11 | RKT | Rocket Cos Inc-class A | +0.1% | -75.81% | Trim |
| 12 | NFE | New Fortress Energy Inc | 0% | — | Unchanged |
| 13 | CUZ | Cousins Properties Inc | -0.1% | -89.73% | Trim |
| 14 | SPY | Ss Spdr S&p 500 ETF Trust-us | -1.8% | EXIT | Sold out |
| 15 | HYG | Ishr Ibx Usd Hiyld Cb Etf-ui | -10.7% | -81.98% | Trim |
Filing History
FAQ
What is One William Street Capital Management, L.P. and what type of investor is it?
One William Street Capital Management, L.P. is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $242.5M, spread across 15 disclosed positions.
What are One William Street Capital Management, L.P.'s largest equity positions?
Based on the latest 13F filing, One William Street Capital Management, L.P.'s top holdings by market value are:
1. Ishr Ibx Usd Hiyld Cb Etf-ui (HYG) — $191.9M (79.2%)
2. Invesco Senior Loan ETF (BKLN) — $15.7M (6.5%)
3. Tpg Re Finance Trust Inc (TRTX) — $9.0M (3.7%)
4. Ishares Russell 2000 ETF (IWM) — $8.3M (3.4%)
5. Vanguard Int-term Corporate (VCIT) — $5.9M (2.4%)
What changes did One William Street Capital Management, L.P. make in its most recent portfolio filing?
In the latest reported quarter, One William Street Capital Management, L.P. made 9 notable position adjustments: 2 new positions were initiated, 0 existing holdings were added to, 6 positions were partially reduced, and 1 were completely exited. The largest of these moves: Sold out: Ss Spdr S&p 500 ETF Trust-us (SPY); New buy: Kkr Real Estate Finance Trus (KREF); New buy: Service Properties Trust (SVC); Trim: Ishr Ibx Usd Hiyld Cb Etf-ui (HYG) — shares -81.98%; Trim: Ishares Russell 2000 ETF (IWM) — shares -35.29%
What sectors does One William Street Capital Management, L.P. focus on?
One William Street Capital Management, L.P. is concentrated in the following sectors based on its current disclosed equity portfolio:
• Real Estate: 58.8%
• Financials: 41.3%
Investment Profile
One William Street Capital Management, L.P. returned an annualized 5.7% over the trailing 36 months — underperforming the S&P 500 by 5.7 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 0.59 (less volatile than the market) and a 25% quarterly batting average against the index.
Its portfolio is concentrated and fast-trading, with 58.8% of the portfolio concentrated in Real Estate.
Its turnover score has risen from 0 to 100 over the past 4 quarters — a shift toward more active trading.
It has added to its TRTX position over the past two quarters (+$4.8M, now $9.0M), while trimming NFE over the same stretch (-$33.1K, still holding $15.5K).
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