One William Street Capital Management, L.P.

CIK

1534300

Location

New York, NY

Portfolio Value

Micro $20,667,163

Diversification

Moderately concentrated

Filing Date

Global Rank

#7,961 / 8,651 ▼ 605

Top Industry

REIT - Mortgage 77.6%

3Y Alpha vs SPY

-71.3%

Period ended 2 months ago

Filed Aug 14, 2026 · 15d

18 quarters · since Mar 2020

Clone Performance

Aug 2023–Aug 2026 · vs SPY

Hypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.

Not a measure of this manager's performance. Most of One William Street Capital Management, L.P.'s reported book is option positions, which a stock-only clone cannot replicate. The figures below are the return of the 81% that is ordinary stock — as little as 0% in one quarter — so a manager whose options thesis lost money can still show a large gain here.

Cloned portfolio

-88.5%

SPY

+71.7%

Annualised alpha

-71.0%

Max drawdown

−93.7%

Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. Returns use comparable raw closes and exclude dividends. Captured split ratios restate closes onto one basis; only an unusable ratio can exclude earlier closes for that listing. It tracks 81% of reported value on average across 12 quarters. Past performance does not predict future results.

Portfolio Concentration

10 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

43.3%

−1.1 pts

Top 5

82.2%

−5.2 pts

Top 10

100.0%

0.0 pts

HHI

2,349

Moderately concentrated−223

Portfolio Trend

18 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Real Estate	85.7%	$17,717,738	7
Financial Services	14.2%	$2,933,975	2
Energy	0.1%	$15,450	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

No qualifying positions this quarter.

Trimmed

Positions the filer reduced

3 positions

Ticker	Company	Δ Shares	Shares	Value
FLG	Flagstar Bank, National Association	−244,000	156,000	$2,330,640
CUZ	Cousins Properties Inc	−179,915	20,585	$617,138
RKT	Rocket Companies, Inc.	−120,030	38,307	$603,335
No positions match the current search.

New Positions

Positions the filer opened this quarter

2 positions

Ticker	Company	Shares	Value
KREF	KKR Real Estate Finance Trust Inc.	202,000	$1,381,680
SVC	Service Properties Trust	630,000	$1,064,700
No positions match the current search.

Sold Out

Positions the filer fully exited

1 positions

Ticker	Company	Shares	Value	Open
SPY	Spdr S&P 500 ETF Trust	32,500	$21,136,050
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

10 tracked positions · $20,667,163 total · filing declares 15 positions · $242,488,349 · as of Jun 30, 2026

All sectors Energy Financial Services Real Estate

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
TRTX	TPG RE Finance Trust, Inc. Real Estate	Held	1,070,000	0	$8,955,900	+7.2%	43.33%
FLG	Flagstar Bank, National Association Financial Services	Reduced	156,000	-244,000	$2,330,640	−55.8%	11.28%
ARI	Apollo Commercial Real Estate Finance, Inc. Real Estate	Held	200,000	0	$2,136,000	+1.1%	10.34%
STWD	Starwood Property Trust, Inc. Real Estate	Held	114,000	0	$1,867,320	−4.9%	9.04%
BXMT	Blackstone Mortgage Trust, Inc. Real Estate	Held	100,000	0	$1,695,000	−11.5%	8.20%
KREF	KKR Real Estate Finance Trust Inc. Real Estate	NEW	202,000	NEW	$1,381,680	NEW	6.69%
SVC	Service Properties Trust Real Estate	NEW	630,000	NEW	$1,064,700	NEW	5.15%
CUZ	Cousins Properties Inc Real Estate	Reduced	20,585	-179,915	$617,138	−86.4%	2.99%
RKT	Rocket Companies, Inc. Financial Services	Reduced	38,307	-120,030	$603,335	−73.3%	2.92%
NFE	New Fortress Energy Inc. Energy	Held	42,564	0	$15,450	−38.5%	0.07%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.