UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended September 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 BEL FUSE INC. (Exact name of registrant as specified in its charter) 206 Van Vorst Street Jersey ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 BEL FUSE INC. (Exact name of registrant as specified in its charter) 206 Van Vorst Street Jersey City ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended March 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 BEL FUSE INC. (Exact name of registrant as specified in its charter) 206 Van Vorst Street Jersey Cit ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _____________________ FORM 10-K (MARK ONE) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 _____________________ BEL FUSE INC. 206 Van Vorst Street Jersey C ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended September 30, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 BEL FUSE INC. 206 Van Vorst Street Jersey City, NJ 07302 (201) 432-0463 (Address of principal ex ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 BEL FUSE INC. 206 Van Vorst Street Jersey City, NJ 07302 (201) 432-0463 (Address of principal executi ...

Revenue and Sales Performance - The Company's revenues for the first three months of 2021 increased by $6.7 million, or 6.4%, compared to the same period in 2020, primarily driven by the Power Solutions and Protection segment [87]. - The backlog of orders reached $233.7 million at March 31, 2021, an increase of $78.7 million, or 51%, from December 31, 2020, with a 74% increase in the backlog for Power Solutions and Protection [88]. - Power Solutions and Protection products saw a sales increase of $7.5 million in Q1 2021, driven by a 25% increase in CUI sales and a 100% increase in eMobility product sales [100]. - Sales of Magnetic Solutions products remained consistent in Q1 2021 compared to Q1 2020, with increased demand but challenges in manufacturing due to the competitive labor market in China [99]. Cost and Expense Analysis - Material costs as a percentage of revenue rose to 45.5% during the first three months of 2021, up from 43.6% in the same period of 2020, due to supply constraints and increased prices for certain components [91]. - Labor costs increased from 8.9% of revenue in Q1 2020 to 9.1% in Q1 2021, influenced by wage increases and unfavorable exchange rate fluctuations [92]. - The gross margin for the Connectivity Solutions segment declined to 25.7% in Q1 2021 from 28.6% in Q1 2020, primarily due to higher material costs [97]. - Cost of sales as a percentage of revenue increased to 78.1% in Q1 2021 from 75.2% in Q1 2020, primarily due to higher material costs and labor costs [101]. - R&D expenses decreased to $5.0 million in Q1 2021 from $6.1 million in Q1 2020, reflecting cost savings from the closure of the R&D facility in Switzerland [104]. - SG&A expenses rose to $21.0 million in Q1 2021, with salaries and fringe benefits increasing by $1.4 million compared to Q1 2020 [105]. - The appreciation of the Chinese Renminbi and British Pound led to higher operating costs of $1.2 million in Q1 2021 compared to the same period in 2020 [117]. Financial Position and Liquidity - The Company maintained a strong cash position of $74.0 million as of March 31, 2021, despite utilizing $19.4 million for acquisitions in the same quarter [86]. - Cash and cash equivalents decreased by $10.9 million in Q1 2021, primarily due to acquisition payments of $14.8 million and capital expenditures of $1.2 million [113]. - The Company has implemented measures to maintain liquidity, including deferring employer social security taxes and restricting new hires [86]. Tax and Earnings Outlook - The provision for income taxes was $1.0 million in Q1 2021, compared to a benefit of ($0.8) million in Q1 2020, with an effective tax rate of 23.8% [107]. - The effective tax rate will fluctuate based on the geographic jurisdiction of pretax profits, with Asia having the lowest tax rates among the Company's segments [95]. - The Company expects positive contributions to net earnings from recent acquisitions and cost savings from restructuring efforts implemented in 2020 [96]. Operational Challenges - The Company anticipates that raw material shortages and long lead times may impact shipment timing, despite a scheduled backlog indicative of stronger sales in upcoming quarters [96]. - Days sales outstanding (DSO) increased to 60 days at March 31, 2021, compared to 57 days at December 31, 2020 [113]. - The company incurred cumulative costs of $7.0 million for the ERP implementation project, achieving annual cost savings of approximately $2 million in SG&A expenses [112].

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _____________________ FORM 10-K (MARK ONE) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 000-11676 _____________________ BEL FUSE INC. 206 Van Vorst Street Jersey C ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ____________ Commission File No. 0-11676 BEL FUSE INC. 206 Van Vorst Street Jersey City, NJ 07302 (201) 432-0463 (Address of principal exec ...

Large accelerated filer ☐ Accelerated filer ☒ Non-accelerated filer ☐ Smaller reporting company ☒ Emerging growth company ☐ Title of Each Class Trading Symbol Name of Exchange on Which Registered Class A Common Stock ($0.10 par value)BELFA Nasdaq Global Select Market Class B Common Stock ($0.10 par value)BELFB Nasdaq Global Select Market UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE A ...