One William Street Capital Management, L.P.: BLACKSTONE MORTGAGE TRUST IN (BXMT): Quarterly 13F Position History
As of Q1 2026, One William Street Capital Management, L.P. reported 100,000 shares of BLACKSTONE MORTGAGE TRUST IN (BXMT), worth $1.9M and representing 3.7% of its 13F equity book. Quarter-over-quarter share count change: + 100,000 (re-initiated) . The position first appeared in Q4 2018 and has been disclosed across 21 13F-HR filings in Pactolio's tracked window.
- 100,000Shares Held (Latest Filing)
- $1.9MReported Market Value (Latest Filing)
- 3.7%Portfolio Weight (% of 13F Equity Book)
- +100,000Quarter-over-Quarter Share Change
- +$1.9MQuarter-over-Quarter Value Change
- 100,000Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 21 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 100,000 | +100,000 | — | $1.9M | 3.7% | $19.1 |
| Q4 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2025 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2023 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2023 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2023 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2023 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2022 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2020 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2020 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2020 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q3 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2019 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2019 | 0 | 30,681 | -100.0% | $0 | 0.0% | — |
| Q4 2018 | 30,681 | — | — | $978.0K | 2.8% | $31.9 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did One William Street Capital Management, L.P. first disclose a BXMT position in 13F-HR filings?
One William Street Capital Management, L.P. first reported BLACKSTONE MORTGAGE TRUST IN (BXMT) on its 13F-HR filing for the period ending 2018-12-31 (Q4 2018). The position has appeared on 21 reported quarters within Pactolio's tracked window.
What was One William Street Capital Management, L.P.'s most recent quarter-over-quarter share-count change in BXMT?
Between Q4 2025 and Q1 2026, One William Street Capital Management, L.P. added 100,000 shares of BXMT (re-initiated), bringing the total reported position to 100,000 shares at a market value of $1.9M.
Does the implied price-per-share represent One William Street Capital Management, L.P.'s cost basis in BXMT?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.