Kenneth Koon Keung Lai - 17 Nov 2025 Form 4 Insider Report for BEL FUSE INC /NJ (BELFA)

Role: VP of Asia Operations
Signature: /s/ Lloyd Jeglikowski, Attorney-in-Fact
Issuer symbol: BELFA
Transactions as of: 17 Nov 2025
Net transactions value: -$359,303
Form type: 4
Filing time: 19 Nov 2025, 20:17:12 UTC
Previous filing: 04 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lai Kenneth Koon Keung	VP of Asia Operations	C/O BEL FUSE INC., 300 EXECUTIVE DRIVE, SUITE 300, WEST ORANGE	/s/ Lloyd Jeglikowski, Attorney-in-Fact	19 Nov 2025	0001960567

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BELFB	Class B Common Stock	Sale	$279,235	-1,936	-19%	$144.23	8,319	17 Nov 2025	Direct	F1
transaction	BELFB	Class B Common Stock	Sale	$80,068	-564	-6.8%	$141.96	7,755	18 Nov 2025	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.84 to $148.72, 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.
F2	This price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $138.46 to $144.27, 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 (2) to this Form 4.

Content

This price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.84 to $148.72, 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.

This price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $138.46 to $144.27, 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 (2) to this Form 4.