One William Street Capital Management, L.P.
CIK
1534300
Location
New York, NY
Portfolio Value
Micro
$47,557,529
Diversification
Highly concentrated
Filing Date
Global Rank
#6,550
/ 8,232
▲ 1420
Top Industry
REIT - Mortgage
54.3%
3Y Alpha vs SPY
-72.2%
Period ended 2 months ago
Filed May 14, 2026 · 30d
16 quarters · since Mar 2020
Clone Performance
Jun 2023–Jun 2026 · vs SPYHypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.
Cloned portfolio
-88.5%
SPY
+76.5%
Annualised alpha
-72.2%
Max drawdown
−93.7%
Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.
Portfolio Concentration
9 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
44.4%
−6.3 pts
Top 5
87.4%
−12.6 pts
Top 10
100.0%
0.0 pts
HHI
2,573
Highly concentrated−1,763
Portfolio Trend
16 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Unclassified | 44.4% | $21,136,050 |
| Real Estate | 39.7% | $18,872,065 |
| Financial Services | 15.8% | $7,524,302 |
| Energy | 0.1% | $25,112 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
1 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| TRTX | TPG RE Finance Trust, Inc. | +593,039 | 1,070,000 | $8,356,700 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reducedNo qualifying positions this quarter.
New Positions
Positions the filer opened this quarter
6 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| SPY | Spdr S&P 500 ETF Trust | 32,500 | $21,136,050 | |
| CUZ | Cousins Properties Inc | 200,500 | $4,525,285 | |
| RKT | Rocket Companies, Inc. | 158,337 | $2,256,302 | |
| ARI | Apollo Commercial Real Estate Finance, Inc. | 200,000 | $2,112,000 | |
| STWD | Starwood Property Trust, Inc. | 114,000 | $1,963,080 | |
| BXMT | Blackstone Mortgage Trust, Inc. | 100,000 | $1,915,000 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited
1 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| GSBD | Goldman Sachs BDC, Inc. | 80,000 | $742,400 | |
| No positions match the current search. | ||||
9 positions ·
$47,557,529 total
· as of Mar 31, 2026
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| SPY |
Spdr S&P 500 ETF Trust
|
NEW | 32,500 | $21,136,050 | 44.44% | |
| TRTX |
TPG RE Finance Trust, Inc.
Real Estate
|
Added | 1,070,000 | $8,356,700 | 17.57% | |
| FLG |
Flagstar Bank, National Association
Financial Services
|
Held | 400,000 | $5,268,000 | 11.08% | |
| CUZ |
Cousins Properties Inc
Real Estate
|
NEW | 200,500 | $4,525,285 | 9.52% | |
| RKT |
Rocket Companies, Inc.
Financial Services
|
NEW | 158,337 | $2,256,302 | 4.74% | |
| ARI |
Apollo Commercial Real Estate Finance, Inc.
Real Estate
|
NEW | 200,000 | $2,112,000 | 4.44% | |
| STWD |
Starwood Property Trust, Inc.
Real Estate
|
NEW | 114,000 | $1,963,080 | 4.13% | |
| BXMT |
Blackstone Mortgage Trust, Inc.
Real Estate
|
NEW | 100,000 | $1,915,000 | 4.03% | |
| NFE |
New Fortress Energy Inc.
Energy
|
Held | 42,564 | $25,112 | 0.05% |