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One William Street Capital Management, L.P.

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13F filer, CIK 1534300, New York, NY

One William Street Capital Management, L.P. reported $1,179,060,959 across 16 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-14. Its ten largest share positions make up 99.95% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001172661-26-001917

Period
2026-03-31
Reported value
$1.18B
Holdings
16
Top 10 weight
99.95%
New
11
Sold out
3

Largest buys vs the previous quarter

SecurityShares changeApprox. value
BKLNnew+725,000$14.8M
VCITnew+71,700$5.93M
SPYnew+7,500$4.88M
TRTXadded+593,039$4.63M
CUZnew+200,500$4.53M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
RSPexited-150,000-$28.7M
HYGexited-50,000-$4.03M
GSBDexited-80,000-$742K

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0001172661-26-001917, largest first. % of portfolio is the value over $52,029,455, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
BKLNINVESCO EXCH TRADED FD TR IIQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 425,000 shares; 2025Q1: not reported; 2025Q2: 500,000 shares; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 725,000 shares 725,000$14.8M28.44%newTimeline
TRTXTPG RE FIN TR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 420,670 shares; 2025Q4: 476,961 shares; 2026Q1: 1,070,000 shares 1,070,000$8.36M16.06%+593,039Timeline
VCITVANGUARD SCOTTSDALE FDSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 71,700 shares; 2025Q4: not reported; 2026Q1: 71,700 shares 71,700$5.93M11.4%newTimeline
FLGFLAGSTAR BANK NATIONAL ASSOCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 205,000 shares; 2025Q4: 400,000 shares; 2026Q1: 400,000 shares 400,000$5.27M10.13%0Timeline
SPYSTATE STR SPDR S&P 500 ETF TQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 7,500 shares 7,500$4.88M9.37%newTimeline
CUZCOUSINS PPTYS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 200,500 shares 200,500$4.53M8.7%newTimeline
RKTROCKET COS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 158,337 shares 158,337$2.26M4.34%newTimeline
ARIAPOLLO COML REAL ESTATE FINQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 200,000 shares 200,000$2.11M4.06%newTimeline
STWDSTARWOOD PPTY TR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 114,000 shares 114,000$1.96M3.77%newTimeline
BXMTBLACKSTONE MORTGAGE TRUST INQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 100,000 shares 100,000$1.92M3.68%newTimeline
NFENEW FORTRESS ENERGY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 50,000 shares; 2024Q4: 50,000 shares; 2025Q1: 50,000 shares; 2025Q2: 50,000 shares; 2025Q3: 42,564 shares; 2025Q4: 42,564 shares; 2026Q1: 42,564 shares 42,564$25.1K0.05%0Timeline

Options

Puts and calls, as filed. The amount and value describe the underlying shares, not the option premium, so they stay out of % of portfolio (H5).

SecurityTypeAmountValueChange
HYGISHARES TR IBOXX HI YD ETFput12,815,900$1.02B+4,191,900
BKLNINVESCO EXCH TRADED FD TR II SR LN ETFcall2,000,000$40.8Mnew
HYGISHARES TR IBOXX HI YD ETFcall500,000$39.8Mnew
SPYSTATE STR SPDR S&P 500 ETF T SHSput25,000$16.3Mnew
IWMISHARES TR SHSput42,500$10.5M+12,500

Sold out in Q1 2026

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
RSPINVESCO EXCHANGE TRADED FD T150,000$28.7Mshares
HYGISHARES TR50,000$4.03Mshares
GSBDGOLDMAN SACHS BDC INC80,000$742Kshares

How Q1 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001172661-26-001917 base2026-05-14acceptance time not in the bulk data set