Bel Fuse Inc.

SecurityBELFB / Bel Fuse Inc.
InstitutionUBS Group AG
Latest Disclosed Ownership57,231 shares
Latest Disclosed Value $ 11,330,594
UBS Group AG reports 754.07% increase in ownership of BELFB / Bel Fuse Inc.

On May 5, 2026 - UBS Group AG filed a 13F-HR form disclosing ownership of 57,231 shares of Bel Fuse Inc. (US:BELFB) valued at $11,330,593 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 6,701 shares of Bel Fuse Inc.. This represents a change in shares of 754.07% during the quarter. The current value of the position is $16,029,831 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)
2026-05-05 2026-03-31 13F BEL FUSE CL B 077347300 57,231 50,530 754.07 11,331 1,014.06 0.0003
2026-01-29 2025-12-31 13F BEL FUSE CL B 077347300 46,575 31,820 215.66 7,901 279.81 0.0013
2025-11-13 2025-09-30 13F BEL FUSE CL B 077347300 14,755 -14,942 -50.31 2,081 -28.30 0.0003
2025-08-14 2025-06-30 13F BEL FUSE CL B 077347300 29,697 -3,160 -9.62 2,901 17.97 0.0005
2025-05-13 2025-03-31 13F BEL FUSE CL B 077347300 32,857 20,529 166.52 2,460 142.03 0.0005
2025-02-14 2024-12-31 13F BEL FUSE CL B 077347300 12,328 4,929 66.62 1,017 75.17 0.0002
2024-11-14 2024-09-30 13F BEL FUSE CL B 077347300 7,399 2,600 54.18 581 85.30 0.0001
2024-08-14 2024-06-30 13F BEL FUSE CL B 077347300 4,799 -7,312 -60.37 313 -57.12 0.0001
2024-05-13 2024-03-31 13F BEL FUSE CL B 077347300 12,111 -1,187 -8.93 730 -17.70 0.0002
2024-02-09 2023-12-31 13F BEL FUSE CL B 077347300 13,298 4,515 51.41 888 111.69 0.0003
2023-11-09 2023-09-30 13F BEL FUSE CL B 077347300 8,783 -495 -5.34 419 -21.24 0.0001
2023-08-11 2023-06-30 13F BEL FUSE CL B 077347300 9,278 7,909 577.72 533 943.14 0.0002
2023-05-12 2023-03-31 13F BEL FUSE CL B 077347300 1,369 80 6.21 51 21.43 0.0000
2023-02-08 2022-12-31 13F BEL FUSE CL B 077347300 1,289 -1,089 -45.79 42 -30.00 0.0000
2022-11-10 2022-09-30 13F BEL FUSE CL B 077347300 2,378 2,372 39,533.33 60 0.0000
2022-08-10 2022-06-30 13F BEL FUSE CL B 077347300 6 -2,047 -99.71 0 -100.00
2022-05-16 2022-03-31 13F BEL FUSE CL B 077347300 2,053 1,052 105.09 37 184.62 0.0000
2022-02-14 2021-12-31 13F BEL FUSE CL B 077347300 1,001 -961 -48.98 13 -45.83 0.0000
2021-11-15 2021-09-30 13F BEL FUSE CL B 077347300 1,962 -874 -30.82 24 -41.46 0.0000
2021-08-13 2021-06-30 13F BEL FUSE CL B 077347300 2,836 -2,607 -47.90 41 -62.04 0.0000
2021-05-12 2021-03-31 13F BEL FUSE CL B 077347300 5,443 -1,111 -16.95 108 9.09 0.0000
2021-02-11 2020-12-31 13F BEL FUSE CL B 077347300 6,554 2,405 57.97 99 125.00 0.0000
2020-11-12 2020-09-30 13F BEL FUSE CL B 077347300 4,149 -1,541 -27.08 44 -27.87 0.0000
2020-07-31 2020-06-30 13F BEL FUSE CL B 077347300 5,690 -763 -11.82 61 -3.17 0.0000
2020-05-01 2020-03-31 13F BEL FUSE CL B 077347300 6,453 -7,548 -53.91 63 -78.05 0.0000
2020-02-14 2019-12-31 13F BEL FUSE CL B 077347300 14,001 6,004 75.08 287 139.17 0.0001
2019-11-14 2019-09-30 13F BEL FUSE CL B 077347300 7,997 4,986 165.59 120 130.77 0.0000
2019-08-14 2019-06-30 13F BEL FUSE CL B 077347300 3,011 1,141 61.02 52 10.64 0.0000
2019-05-14 2019-03-31 13F BEL FUSE CL B 077347300 1,870 -2,808 -60.03 47 -45.98 0.0000
2019-02-14 2018-12-31 13F BEL FUSE CL B 077347300 4,678 1,482 46.37 87 3.57 0.0000
2018-11-14 2018-09-30 13F BEL FUSE CL B 077347300 3,196 1,961 158.79 84 223.08 0.0000
2018-08-14 2018-06-30 13F BEL FUSE CL B 077347300 1,235 307 33.08 26 52.94 0.0000
2018-05-15 2018-03-31 13F BEL FUSE CL B 077347300 928 2 0.22 17 -26.09 0.0000
2018-02-14 2017-12-31 13F BEL FUSE CL B 077347300 926 -766 -45.27 23 -56.60 0.0000
2017-11-14 2017-09-30 13F BEL FUSE CL B 077347300 1,692 732 76.25 53 120.83 0.0000
2017-11-14 2017-06-30 13F/A-1 BEL FUSE CL B 077347300 960 423 78.77 24 71.43 0.0000
2017-08-14 2017-06-30 13F BEL FUSE CL B 077347300 960 423 24
2017-11-14 2017-03-31 13F/A-1 BEL FUSE CL B 077347300 537 -2,370 -81.53 14 -84.44 0.0000
2017-05-12 2017-03-31 13F BEL FUSE CL B 077347300 537 -2,370 14
2017-02-14 2016-12-31 13F BEL FUSE CL B 077347300 2,907 2,639 984.70 90 1,400.00 0.0000
2016-11-14 2016-09-30 13F BEL FUSE CL B 077347300 268 -2,051 -88.44 6 -85.37 0.0000
2016-08-12 2016-06-30 13F BEL FUSE CL B 077347300 2,319 2,259 3,765.00 41 4,000.00 0.0000
2016-05-12 2016-03-31 13F BEL FUSE CL B 077347300 60 -451 -88.26 1 -88.89 0.0000
2016-02-16 2015-12-31 13F BEL FUSE CL B 077347300 511 442 640.58 9 800.00 0.0000
2015-11-13 2015-09-30 13F BEL FUSE CL B 077347300 69 -35 -33.65 1 -50.00 0.0000
2015-08-14 2015-06-30 13F BEL FUSE CL B 077347300 104 -1,073 -91.16 2 -93.75 0.0000
2015-02-17 2014-12-31 13F BEL FUSE CL B 077347300 1,177 1,177 32 0.0000
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.