X0508 4 2026-02-24 0000729580 BEL FUSE INC /NJ BELFB 0001241640 GILBERT PETER E C/O BEL FUSE INC. 300 EXECUTIVE DRIVE, SUITE 300 WEST ORANGE NJ 07052 1 0 Class B Common Stock 2026-02-24 4 S 0 4500 238.75 D 15047 D Class B Common Stock 1250 I By wife Class A Common Stock 500 D This price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $238.38 to $239.00, inclusive. The reporting person undertakes to provide to Bel Fuse Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. /s/ Lloyd Jeglikowski, Attorney-in-Fact 2026-02-25