Bel Fuse Inc.

SecurityBELFB / Bel Fuse Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership61,252 shares
Latest Disclosed Value $ 12,126,694
Morgan Stanley reports 47.39% increase in ownership of BELFB / Bel Fuse Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 61,252 shares of Bel Fuse Inc. (US:BELFB) valued at $12,126,671 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 41,559 shares of Bel Fuse Inc.. This represents a change in shares of 47.39% during the quarter. The current value of the position is $16,082,325 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)
2026-05-15 2026-03-31 13F BEL FUSE CL B 077347300 61,252 19,693 47.39 12,127 72.02 0.0007
2026-05-27 2025-12-31 13F/A-1 BEL FUSE CL B 077347300 41,559 3,401 8.91 7,050 31.00 0.0004
2026-02-13 2025-12-31 13F BEL FUSE CL B 077347300 41,559 3,401 7,050 0.0004
2026-05-27 2025-09-30 13F/A-1 BEL FUSE CL B 077347300 38,158 7,117 22.93 5,381 77.47 0.0003
2025-11-14 2025-09-30 13F BEL FUSE CL B 077347300 38,158 7,117 5,381 0.0003
2025-08-15 2025-06-30 13F BEL FUSE CL B 077347300 31,041 -14,165 -31.33 3,032 -10.40 0.0002
2025-05-15 2025-03-31 13F BEL FUSE CL B 077347300 45,206 -7,536 -14.29 3,384 -22.19 0.0002
2025-05-15 2024-12-31 13F/A-1 BEL FUSE CL B 077347300 52,742 -28,052 -34.72 4,350 -31.44 0.0003
2025-02-14 2024-12-31 13F BEL FUSE CL B 077347300 52,742 -28,052 4,350 0.0003
2025-05-14 2024-09-30 13F/A-2 BEL FUSE CL B 077347300 80,794 6,144 8.23 6,343 30.25 0.0005
2025-02-14 2024-09-30 13F/A-1 BEL FUSE CL B 077347300 80,794 6,144 6,343 0.0005
2024-11-14 2024-09-30 13F BEL FUSE CL B 077347300 80,794 6,144 6,343 0.0005
2025-05-14 2024-06-30 13F/A-2 BEL FUSE CL B 077347300 74,650 19,209 34.65 4,870 45.68 0.0004
2024-10-17 2024-06-30 13F/A-1 BEL FUSE CL B 077347300 74,650 72,484 4,870 0.0004
2024-08-14 2024-06-30 13F BEL FUSE CL B 077347300 74,650 72,484 4,870 0.0004
2024-10-17 2024-03-31 13F/A-2 BEL FUSE CL B 077347300 55,441 -23,256 -29.55 3,344 -36.37 0.0003
2024-08-16 2024-03-31 13F/A-1 BEL FUSE CL B 077347300 55,441 3,344
2024-05-15 2024-03-31 13F BEL FUSE CL B 077347300 55,441 3,344
2024-08-16 2023-12-31 13F/A-1 BEL FUSE CL B 077347300 78,697 33,797 75.27 5,255 145.28 0.0005
2024-02-13 2023-12-31 13F BEL FUSE CL B 077347300 78,697 33,797 5,255 0.0005
2023-11-15 2023-09-30 13F BEL FUSE CL B 077347300 44,900 -164,030 -78.51 2,143 -82.14 0.0002
2023-08-14 2023-06-30 13F BEL FUSE CL B 077347300 208,930 -59,480 -22.16 11,995 18.92 0.0012
2023-05-15 2023-03-31 13F BEL FUSE CL B 077347300 268,410 8,916 3.44 10,087 18.08 0.0011
2023-02-14 2022-12-31 13F BEL FUSE CL B 077347300 259,494 -20,408 -7.29 8,543 20.85 0.0010
2022-11-14 2022-09-30 13F BEL FUSE CL B 077347300 279,902 25,470 10.01 7,068 78.58 0.0010
2022-10-27 2022-06-30 13F/A-1 BEL FUSE CL B 077347300 254,432 126,972 99.62 3,958 74.05 0.0005
2022-08-15 2022-06-30 13F BEL FUSE CL B 077347300 254,432 126,972 3,958 0.0005
2022-10-27 2022-03-31 13F/A-1 BEL FUSE CL B 077347300 127,460 -26,556 -17.24 2,274 14.21 0.0003
2022-05-13 2022-03-31 13F BEL FUSE CL B 077347300 127,460 -26,556 2,274 0.0003
2022-02-14 2021-12-31 13F BEL FUSE CL B 077347300 154,016 44,287 40.36 1,991 45.97 0.0002
2021-11-15 2021-09-30 13F BEL FUSE CL B 077347300 109,729 8,980 8.91 1,364 -6.00 0.0002
2021-08-23 2021-06-30 13F/A-1 BEL FUSE CL B 077347300 100,749 21,344 26.88 1,451 -8.11 0.0002
2021-08-16 2021-06-30 13F BEL FUSE CL B 077347300 100,749 100,149 1,451 0.0002
2021-05-17 2021-03-31 13F BEL FUSE CL B 077347300 79,405 -18,440 -18.85 1,579 7.34 0.0002
2021-02-16 2020-12-31 13F BEL FUSE CL B 077347300 97,845 19,485 24.87 1,471 75.75 0.0002
2020-11-13 2020-09-30 13F BEL FUSE CL B 077347300 78,360 24,306 44.97 837 44.31 0.0002
2020-08-14 2020-06-30 13F BEL FUSE CL B 077347300 54,054 11,186 26.09 580 39.09 0.0001
2020-05-26 2020-03-31 13F/A-1 BEL FUSE CL B 077347300 42,868 -21,155 -33.04 417 -68.24 0.0001
2020-05-15 2020-03-31 13F BEL FUSE CL B 077347300 42,868 -21,155 417 32.0343
2020-02-14 2019-12-31 13F BEL FUSE CL B 077347300 64,023 21,486 50.51 1,313 105.48 0.0003
2019-11-14 2019-09-30 13F BEL FUSE CL B 077347300 42,537 -2,379 -5.30 639 -17.12 0.0002
2019-08-14 2019-06-30 13F BEL FUSE CL B 077347300 44,916 1,964 4.57 771 -29.01 0.0002
2019-05-15 2019-03-31 13F BEL FUSE CL B 077347300 42,952 -4,888 -10.22 1,086 23.13 0.0003
2019-02-14 2018-12-31 13F BEL FUSE CL B 077347300 47,840 -44,107 -47.97 882 -63.79 0.0003
2019-04-23 2018-09-30 13F/A-2 BEL FUSE CL B 077347300 91,947 17,900 24.17 2,436 57.47 0.0006
2018-11-20 2018-09-30 13F/A-1 BEL FUSE CL B 077347300 91,947 91,930 2,436 0.0006
2018-11-14 2018-09-30 13F BEL FUSE CL B 077347300 91,947 17,900 2,436
2019-04-23 2018-06-30 13F/A-1 BEL FUSE CL B 077347300 74,047 -4,197 -5.36 1,547 4.67 0.0004
2018-08-14 2018-06-30 13F BEL FUSE CL B 077347300 74,047 -4,197 1,547
2019-04-23 2018-03-31 13F/A-1 BEL FUSE CL B 077347300 78,244 -12,673 -13.94 1,478 -35.43 0.0004
2018-05-14 2018-03-31 13F BEL FUSE CL B 077347300 78,244 -12,673 1,478
2019-04-23 2017-12-31 13F/A-1 BEL FUSE CL B 077347300 90,917 17,781 24.31 2,289 0.35 0.0006
2018-02-14 2017-12-31 13F BEL FUSE CL B 077347300 90,917 17,781 2,289
2017-11-14 2017-09-30 13F BEL FUSE CL B 077347300 73,136 21,202 40.82 2,281 77.79 0.0007
2017-08-11 2017-06-30 13F BEL FUSE CL B 077347300 51,934 -35,649 -40.70 1,283 -42.65 0.0004
2017-05-22 2017-03-31 13F/A-1 BEL FUSE CL B 077347300 87,583 -13,527 -13.38 2,237 -28.39 0.0007
2017-05-12 2017-03-31 13F BEL FUSE CL B 077347300 87,583 2,237
2017-02-22 2016-12-31 13F/A-1 BEL FUSE CL B 077347300 101,110 27,011 36.45 3,124 74.62 0.0010
2017-02-13 2016-12-31 13F BEL FUSE CL B 077347300 101,110 3,124
2016-11-10 2016-09-30 13F BEL FUSE CL B 077347300 74,099 -33,604 -31.20 1,789 -6.63 0.0006
2016-08-12 2016-06-30 13F BEL FUSE CL B 077347300 107,703 45,745 73.83 1,916 111.95 0.0007
2016-05-12 2016-03-31 13F BEL FUSE CL B 077347300 61,958 -21,812 -26.04 904 -37.61 0.0003
2016-02-09 2015-12-31 13F BEL FUSE CL B 077347300 83,770 38,628 85.57 1,449 65.03 0.0005
2016-02-08 2015-09-30 13F/A-1 BEL FUSE CL B 077347300 45,142 22,718 101.31 878 90.87 0.0003
2015-11-09 2015-09-30 13F BEL FUSE CL B 077347300 45,142 878
2015-08-12 2015-06-30 13F BEL FUSE CL B 077347300 22,424 18,490 470.01 460 513.33 0.0002
2015-05-14 2015-03-31 13F BEL FUSE CL B 077347300 3,934 -20,639 -83.99 75 -88.82 0.0000
2015-02-13 2014-12-31 13F BEL FUSE CL B 077347300 24,573 2,471 11.18 671 22.67 0.0002
2014-12-16 2014-09-30 13F/A-1 BEL FUSE CL B 077347300 22,102 14,459 189.18 547 179.08 0.0002
2014-11-14 2014-09-30 13F BEL FUSE CL B 077347300 22,102 547
2014-08-12 2014-06-30 13F BEL FUSE CL B 077347300 7,643 -16,787 -68.71 196 -63.36 0.0003
2014-05-13 2014-03-31 13F BEL FUSE CL B 077347300 24,430 -4,144 -14.50 535 -12.15 0.0002
2014-02-13 2013-12-31 13F BEL FUSE CL B 077347300 28,574 12,348 76.10 609 115.19 0.0003
2013-11-13 2013-09-30 13F BEL FUSE INC CL B COM 077347300 16,226 3,449 26.99 283 64.53 0.0001
2013-08-08 2013-06-30 13F BEL FUSE INC CL B COM 077347300 12,777 12,777 172 0.0001
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.