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 ...

Revenue Performance - The Company's revenues for the first nine months of 2020 decreased by $27.6 million, or 7.3%, compared to the same period in 2019, with a decline across all major product groups [85]. - Power Solutions and Protection revenues increased by 1.4% in the first nine months of 2020, while Connectivity Solutions and Magnetic Solutions revenues decreased by 11.3% and 12.3%, respectively [88]. - Connectivity Solutions revenue decreased by $6.0 million and $14.8 million for the three and nine months ended September 30, 2020, compared to the same periods in 2019, primarily due to lower demand from commercial aerospace customers [95]. - Magnetic Solutions revenue declined by $1.5 million and $14.6 million during the three and nine months ended September 30, 2020, respectively, impacted by COVID-19 factory closures in China [96]. - Power Solutions and Protection revenue increased by $7.5 million and $1.8 million for the three and nine months ended September 30, 2020, respectively, with the CUI business contributing $10.9 million and $29.8 million in sales [97]. Cost Management - Labor costs as a percentage of revenue decreased from 10.4% in the first nine months of 2019 to 10.0% in the same period of 2020 [90]. - Material costs as a percentage of revenue decreased slightly to 43.0% during the first nine months of 2020 from 44.1% in the same period of 2019 [89]. - Total cost of sales as a percentage of revenue improved to 73.1% for the three months ended September 30, 2020, down from 77.0% in 2019, due to reductions in material and other expenses [100]. - Research and Development expenses decreased to $5.7 million for the three months ended September 30, 2020, down from $6.2 million in 2019, reflecting cost savings from restructuring [102]. - Selling, General and Administrative expenses increased to $18.9 million for the third quarter of 2020, up $0.4 million from the same period in 2019, primarily due to incremental expenses from the CUI acquisition [103]. Financial Position - Cash on hand was $81.1 million at September 30, 2020, compared to $72.3 million at December 31, 2019, despite voluntary debt payments of $18.2 million [84]. - Cash and cash equivalents represented approximately 32.9% of total assets at September 30, 2020, compared to 31.6% at December 31, 2019 [109]. - The Company had a current ratio of 3.2 to 1 at September 30, 2020, indicating strong liquidity [109]. - The unused credit available under the credit facility was $53.0 million as of September 30, 2020, with compliance to debt covenants maintained [111]. - The Company has the ability to borrow an additional $53.0 million under its revolving credit facility while remaining in compliance with debt covenants [84]. Order Backlog - The backlog of orders was $138.9 million at September 30, 2020, a decline of $21.4 million, or 13%, from December 31, 2019 [87]. COVID-19 Impact - The Company received $4.1 million in COVID-19 relief funding from the Chinese government during the nine months ended September 30, 2020 [80]. - Sales are expected to be similar to the fourth quarter of 2019, with a focus on improving profitability through a global cost reduction plan [94]. - The company recognized lower operating costs of $1.6 million due to a 12% depreciation of the Peso and a 2% depreciation of the Renminbi during the first nine months of 2020 [118]. - Foreign exchange losses of $1.1 million were recognized on translation of local currency balance sheet accounts to the U.S. Dollar [118]. ERP Implementation - The company has incurred cumulative costs of $7.0 million for the ERP implementation project, with annual cost savings of approximately $2 million in SG&A expenses since 2019 [112]. - The company completed the first phase of the ERP implementation in Q1 2019 and the second phase in Q1 2020, with full completion anticipated by early 2021 [112].

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 ...