Golub Capital BDC, Inc.
US ˙ NasdaqGS ˙ US38173M1027

SecurityGBDC / Golub Capital BDC, Inc.
InstitutionTranquility Partners, LLC
Latest Disclosed Ownership362,806 shares
Latest Disclosed Value $ 4,593,126
Tranquility Partners, LLC reports 2.63% increase in ownership of GBDC / Golub Capital BDC, Inc.

On April 20, 2026 - Tranquility Partners, LLC filed a 13F-HR form disclosing ownership of 362,806 shares of Golub Capital BDC, Inc. (US:GBDC) valued at $4,593,124 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 353,494 shares of Golub Capital BDC, Inc.. This represents a change in shares of 2.63% during the quarter. The current value of the position is $4,785,411 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)
2026-04-20 2026-03-31 13F GOLUB CAP BDC COM 38173M102 362,806 9,312 2.63 4,593 -4.23 1.7327
2026-02-03 2025-12-31 13F GOLUB CAP BDC COM 38173M102 353,494 4,115 1.18 4,797 0.29 1.7280
2025-10-30 2025-09-30 13F GOLUB CAP BDC COM 38173M102 349,379 -2,313 -0.66 4,783 -7.18 1.6149
2025-07-25 2025-06-30 13F GOLUB CAP BDC COM 38173M102 351,692 -123 -0.03 5,152 -3.27 1.8401
2025-04-24 2025-03-31 13F GOLUB CAP BDC COM 38173M102 351,815 9,470 2.77 5,326 0.81 2.0570
2025-01-29 2024-12-31 13F GOLUB CAP BDC COM 38173M102 342,345 -8,343 -2.38 5,284 -0.28 1.9870
2024-11-07 2024-09-30 13F GOLUB CAP BDC COM 38173M102 350,688 3,848 1.11 5,299 -2.75 1.9213
2024-07-25 2024-06-30 13F GOLUB CAP BDC COM 38173M102 346,840 3,479 1.01 5,449 -4.59 2.0964
2024-05-07 2024-03-31 13F GOLUB CAP BDC COM 38173M102 343,361 4,036 1.19 5,710 11.46 2.2069
2024-01-31 2023-12-31 13F GOLUB CAP BDC COM 38173M102 339,325 -159,488 -31.97 5,124 -29.98 2.1482
2023-10-31 2023-09-30 13F GOLUB CAP BDC COM 38173M102 498,813 77,535 18.40 7,318 28.66 3.1368
2023-07-17 2023-06-30 13F GOLUB CAP BDC COM 38173M102 421,278 79,340 23.20 5,687 22.67 2.4499
2023-05-08 2023-03-31 13F GOLUB CAP BDC COM 38173M102 341,938 141,526 70.62 4,637 75.81 2.2090
2023-02-02 2022-12-31 13F GOLUB CAP BDC COM 38173M102 200,412 -146,939 -42.30 2,637 -38.73 1.3416
2022-11-01 2022-09-30 13F GOLUB CAP BDC COM 38173M102 347,351 13,307 3.98 4,304 -0.58 2.3951
2022-08-01 2022-06-30 13F GOLUB CAP BDC COM 38173M102 334,044 28,916 9.48 4,329 -6.72 2.2394
2022-04-29 2022-03-31 13F GOLUB CAP BDC COM 38173M102 305,128 19,354 6.77 4,641 5.17 2.1731
2022-01-31 2021-12-31 13F GOLUB CAP BDC COM 38173M102 285,774 24,611 9.42 4,413 6.88 2.0423
2021-10-20 2021-09-30 13F GOLUB CAP BDC COM 38173M102 261,163 25,137 10.65 4,129 13.43 2.0954
2021-07-23 2021-06-30 13F GOLUB CAP BDC COM 38173M102 236,026 68,122 40.57 3,640 48.27 2.0451
2021-04-30 2021-03-31 13F GOLUB CAP BDC COM 38173M102 167,904 54,029 47.45 2,455 52.48 1.5268
2021-01-29 2020-12-31 13F GOLUB CAP BDC COM 38173M102 113,875 12,341 12.15 1,610 19.79 1.1375
2020-11-10 2020-09-30 13F GOLUB CAP BDC COM 38173M102 101,534 -1,063 -1.04 1,344 12.47 1.1419
2020-07-29 2020-06-30 13F GOLUB CAP BDC COM 38173M102 102,597 30,417 42.14 1,195 31.75 1.1252
2020-04-20 2020-03-31 13F GOLUB CAP BDC COM 38173M102 72,180 72,180 907 1.0439
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.