Bain Capital Specialty Finance, Inc.
US ˙ NYSE ˙ US05684B1070

SecurityBCSF / Bain Capital Specialty Finance, Inc.
InstitutionMuzinich & Co., Inc.
Latest Disclosed Ownership801,257 shares
Latest Disclosed Value $ 9,935,586
Muzinich & Co., Inc. reports 2.18% increase in ownership of BCSF / Bain Capital Specialty Finance, Inc.

On April 23, 2026 - Muzinich & Co., Inc. filed a 13F-HR form disclosing ownership of 801,257 shares of Bain Capital Specialty Finance, Inc. (US:BCSF) valued at $9,935,587 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 784,147 shares of Bain Capital Specialty Finance, Inc.. This represents a change in shares of 2.18% during the quarter. The current value of the position is $10,600,630 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-23 2026-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 801,257 17,110 2.18 9,936 -8.91 3.4752
2026-01-21 2025-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 784,147 136,613 21.10 10,907 18.21 3.4297
2025-10-20 2025-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 647,534 93,732 16.93 9,227 10.78 3.5655
2025-08-04 2025-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 553,802 191,776 52.97 8,329 38.61 3.6147
2025-05-05 2025-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 362,026 42,501 13.30 6,010 7.34 3.4126
2025-02-05 2024-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 319,525 -4,486 -1.38 5,598 4.09 3.5066
2024-11-06 2024-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 324,011 0 0.00 5,379 1.78 3.7952
2024-08-07 2024-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 324,011 86,728 36.55 5,285 47.80 4.0379
2024-05-13 2024-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 237,283 0 0.00 3,576 0.00 2.3787
2024-02-14 2023-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 237,283 -29,231 -10.97 3,576 -12.38 2.3787
2023-11-13 2023-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 266,514 -17,910 -6.30 4,080 6.19 2.8316
2023-08-11 2023-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 284,424 -13,900 -4.66 3,843 8.04 2.6154
2023-05-11 2023-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 298,324 -8,000 -2.61 3,556 -2.44 2.5843
2023-02-09 2022-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 306,324 19,022 6.62 3,645 5.71 2.7246
2022-11-14 2022-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 287,302 0 0.00 3,448 -11.82 2.9560
2022-08-12 2022-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 287,302 3,500 1.23 3,910 -11.62 2.7511
2022-05-13 2022-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 283,802 -42,433 -13.01 4,424 -10.84 2.1041
2022-02-11 2021-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 326,235 -69,073 -17.47 4,962 -15.43 2.8604
2021-11-12 2021-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 395,308 24,562 6.63 5,867 3.44 3.6832
2021-08-13 2021-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 370,746 -94,522 -20.32 5,672 -17.52 3.0467
2021-05-14 2021-03-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 465,268 10,376 2.28 6,877 24.63 2.6943
2021-02-16 2020-12-31 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 454,892 20,725 4.77 5,518 24.59 2.2701
2020-11-13 2020-09-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 434,167 -27,423 -5.94 4,429 -13.39 1.7861
2020-08-14 2020-06-30 13F BAIN CAP SPECIALTY FIN COM STK 05684B107 461,590 98,077 26.98 5,114 51.75 1.5369
2020-05-15 2020-03-31 13F/A-1 BAIN CAP SPECIALTY FIN COM 05684B107 363,513 -40,914 -10.12 3,370 -57.83 1.7149
2020-05-14 2020-03-31 13F BAIN CAP SPECIALTY FIN COM 05684B107 363,513 -40,914 3,370 2,430,247.5679
2020-02-13 2019-12-31 13F BAIN CAP SPECIALTY FIN COM 05684B107 404,427 -83,691 -17.15 7,991 -13.70 2.8145
2019-11-13 2019-09-30 13F BAIN CAP SPECIALTY FIN COM 05684B107 488,118 -53,780 -9.92 9,260 -8.22 2.7714
2019-08-13 2019-06-30 13F BAIN CAP SPECIALTY FIN COM 05684B107 541,898 0 0.00 10,089 -3.53 2.0934
2019-05-14 2019-03-31 13F BAIN CAP SPECIALTY FIN COM 05684B107 541,898 444,506 456.41 10,458 540.42 0.8535
2019-02-12 2018-12-31 13F Bain Capital Specialty Finan COM 05684B107 97,392 97,392 1,633 0.4622
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.