Biggest changeThe book-to-bill ratio in the fourth fiscal quarter of 2024 increased to 1.01 versus 0.88 in the third fiscal quarter of 2024. 38 Financial Metrics by Segment The following table shows net revenues, book-to-bill ratio, gross profit margin, and segment operating margin broken out by segment for the five fiscal quarters beginning with the fourth fiscal quarter of 2023 through the fourth fiscal quarter of 2024 (dollars in thousands) : 4th Quarter 2023 1st Quarter 2024 2nd Quarter 2024 3rd Quarter 2024 4th Quarter 2024 MOSFETs Net revenues $ 168,158 $ 153,173 $ 155,053 $ 147,134 $ 146,619 Book-to-bill ratio 0.62 0.68 0.79 0.84 0.98 Gross profit margin 27.3 % 16.6 % 13.9 % 11.7 % 15.6 % Segment operating margin 16.8 % 5.3 % 1.2 % (2.9 )% 0.8 % Diodes Net revenues $ 163,324 $ 149,130 $ 146,265 $ 145,183 $ 141,397 Book-to-bill ratio 0.61 0.72 0.85 0.74 1.00 Gross profit margin 24.1 % 21.7 % 21.2 % 20.1 % 20.2 % Segment operating margin 20.9 % 17.4 % 16.7 % 15.7 % 16.1 % Optoelectronic Components Net revenues $ 53,853 $ 49,199 $ 53,010 $ 63,227 $ 46,932 Book-to-bill ratio 0.59 0.89 0.82 0.77 1.00 Gross profit margin 12.1 % 14.2 % 26.8 % 18.3 % 11.7 % Segment operating margin 3.4 % 3.0 % 16.4 % 9.7 % 1.1 % Resistors Net revenues $ 198,022 $ 188,196 $ 179,498 $ 180,889 $ 177,031 Book-to-bill ratio 0.82 0.79 0.87 0.95 0.91 Gross profit margin 25.6 % 24.7 % 22.9 % 22.5 % 17.3 % Segment operating margin 22.0 % 20.3 % 18.3 % 17.9 % 12.7 % Inductors Net revenues $ 87,868 $ 88,651 $ 94,061 $ 90,253 $ 83,390 Book-to-bill ratio 0.91 0.96 0.97 0.83 1.01 Gross profit margin 33.4 % 30.2 % 30.1 % 30.3 % 29.6 % Segment operating margin 29.6 % 26.1 % 26.1 % 26.2 % 25.0 % Capacitors Net revenues $ 114,011 $ 117,930 $ 113,352 $ 108,667 $ 119,347 Book-to-bill ratio 0.95 1.03 0.87 1.10 1.21 Gross profit margin 25.3 % 27.4 % 23.5 % 22.9 % 25.1 % Segment operating margin 20.4 % 22.5 % 18.5 % 17.4 % 20.0 % _________ 39 Acquisition Activity As part of its growth strategy, the Company seeks to expand through targeted acquisitions of other manufacturers of electronic components.
Biggest changeThe book-to-bill ratio in the fourth fiscal quarter of 2025 increased to 1.20 versus 0.97 in the third fiscal quarter of 2025. 38 Financial Metrics by Segment The following table shows net revenues, book-to-bill ratio, gross profit margin, and segment operating margin broken out by segment for the five fiscal quarters beginning with the fourth fiscal quarter of 2024 through the fourth fiscal quarter of 2025 (dollars in thousands) : 4th Quarter 2024 1st Quarter 2025 2nd Quarter 2025 3rd Quarter 2025 4th Quarter 2025 MOSFETs Net revenues $ 146,619 $ 142,113 $ 148,633 $ 167,133 $ 172,584 Book-to-bill ratio 0.98 1.32 1.00 0.86 1.48 Gross profit margin 15.6 % 8.2 % 6.3 % 10.1 % 13.8 % Segment operating margin 0.8 % (6.1 )% (9.7 )% (3.8 )% (0.5 )% Diodes Net revenues $ 141,397 $ 140,963 $ 147,942 $ 149,628 $ 154,224 Book-to-bill ratio 1.00 0.99 0.93 1.07 1.09 Gross profit margin 20.2 % 19.9 % 20.0 % 20.3 % 20.3 % Segment operating margin 16.1 % 15.0 % 15.0 % 15.2 % 15.3 % Optoelectronic Components Net revenues $ 46,932 $ 51,168 $ 54,119 $ 55,590 $ 55,674 Book-to-bill ratio 1.00 0.90 1.05 0.93 1.12 Gross profit margin 11.7 % 20.9 % 23.2 % 22.9 % 15.0 % Segment operating margin 1.1 % 10.6 % 12.6 % 12.9 % 4.5 % Resistors Net revenues $ 177,031 $ 179,500 $ 194,769 $ 195,707 $ 189,367 Book-to-bill ratio 0.91 1.00 0.91 0.92 1.05 Gross profit margin 17.3 % 22.5 % 22.8 % 20.1 % 19.4 % Segment operating margin 12.7 % 17.4 % 17.9 % 15.3 % 14.3 % Inductors Net revenues $ 83,390 $ 84,121 $ 95,675 $ 91,990 $ 92,588 Book-to-bill ratio 1.01 1.02 0.91 0.99 1.07 Gross profit margin 29.6 % 20.9 % 28.0 % 30.7 % 29.8 % Segment operating margin 25.0 % 16.5 % 24.0 % 26.6 % 25.4 % Capacitors Net revenues $ 119,347 $ 117,371 $ 121,112 $ 130,592 $ 136,485 Book-to-bill ratio 1.21 1.13 1.40 1.07 1.30 Gross profit margin 25.1 % 23.2 % 21.5 % 20.1 % 21.3 % Segment operating margin 20.0 % 17.5 % 16.3 % 15.2 % 16.6 % _________ 39 Acquisition Activity As part of its growth strategy, the Company seeks to expand through targeted acquisitions of other manufacturers of electronic components.
While we plan to advance our capacity expansion projects, we have and will continue to modulate the spending in response to order flow and the timing of customer demand and qualifications. The decreased lead time for equipment and the increased subcontractor capacity are also variables that allow us to adjust our capacity spending.
While we plan to advance our capacity expansion projects, we have and will continue to modulate spending in response to order flow and the timing of customer demand and qualifications. The decreased lead time for equipment and the increased subcontractor capacity are also variables that allow us to adjust our capacity spending.
Management believes such additional non-cash costs will enhance the long-term performance of the Company by providing selected participants with an incentive to improve the growth and profitability of the Company. In 2024, we revised our short-term incentive compensation structure to better align with our growth objectives.
Management believes such additional non-cash costs will enhance the long-term performance of the Company by providing selected participants with an incentive to improve the growth and profitability of the Company. In 2024, we revised our short-term incentive ("STI") compensation structure to better align with our growth objectives.
The measure, as calculated by us, may not be comparable to similarly titled measures used by other companies. 56 We invest a portion of our excess cash in highly liquid, high-quality instruments with maturities greater than 90 days, but less than 1 year, which we classify as short-term investments on our consolidated balance sheets.
The measure, as calculated by us, may not be comparable to similarly titled measures used by other companies. 55 We invest a portion of our excess cash in highly liquid, high-quality instruments with maturities greater than 90 days, but less than 1 year, which we classify as short-term investments on our consolidated balance sheets.
("Vishay," "we," "us," or "our") manufactures one of the world’s largest portfolios of discrete semiconductors and passive electronic components that are essential to innovative designs in the automotive, industrial, computing, consumer, telecommunications, military, aerospace, and medical markets. We operate in six segments based on product functionality: MOSFETs, Diodes, Optoelectronic Components, Resistors, Inductors, and Capacitors.
("Vishay," "we," "us," or "our") manufactures one of the world’s largest portfolios of discrete semiconductors and passive electronic components that are essential to innovative designs in the automotive, industrial, computing, consumer, telecommunications, military, aerospace, and healthcare markets. We operate in six segments based on product functionality: MOSFETs, Diodes, Optoelectronic Components, Resistors, Inductors, and Capacitors.
Also beginning in 2023, we began making significant investments in capital expenditures primarily for capital expansion projects primarily outside of China, which will also increase depreciation expense. At the same time, we are focusing on increasing our technical resources, adding additional customer-facing engineers, and intensifying our activities in R&D.
Also, beginning in 2023, we began making significant investments in capital expenditures primarily for capital expansion projects primarily outside of China, which has and will further increase depreciation expense. At the same time, we are focusing on increasing our technical resources, adding additional customer-facing engineers, and intensifying our activities in R&D.
However, if economic conditions change or if our investment strategy changes, we may be inclined to change some of our assumptions, and the resulting change could have a material impact on the consolidated statements of operations and on the consolidated balance sheet. 45 Income Taxes We are subject to income taxes in the U.S. and numerous foreign jurisdictions.
However, if economic conditions change or if our investment strategy changes, we may be inclined to change some of our assumptions, and the resulting change could have a material impact on the consolidated statements of operations and on the consolidated balance sheet. 44 Income Taxes We are subject to income taxes in the U.S. and numerous foreign jurisdictions.
Based on our current total leverage ratio of 2.64 to 1, any new U.S. dollar borrowings will bear interest at SOFR plus 2.10% (including the applicable credit spread), and the undrawn commitment fee is 0.35% per annum. 57 The borrowings under the credit facility are secured by a lien on substantially all assets, including accounts receivable, inventory, machinery and equipment, and general intangibles (but excluding real estate, intellectual property registered or licensed solely for use in, or arising solely under the laws of, any country other than the United States, assets located solely outside of the United States and deposit and securities accounts), of Vishay and certain significant subsidiaries located in the United States, and pledges of stock in certain subsidiaries; and are guaranteed by certain significant subsidiaries.
Based on our current total leverage ratio of 3.23 to 1, any new U.S. dollar borrowings will bear interest at SOFR plus 2.10% (including the applicable credit spread), and the undrawn commitment fee is 0.35% per annum. 56 The borrowings under the credit facility are secured by a lien on substantially all assets, including accounts receivable, inventory, machinery and equipment, and general intangibles (but excluding real estate, intellectual property registered or licensed solely for use in, or arising solely under the laws of, any country other than the United States, assets located solely outside of the United States and deposit and securities accounts), of Vishay and certain significant subsidiaries located in the United States, and pledges of stock in certain subsidiaries; and are guaranteed by certain significant subsidiaries.
On March 5, 2024, we completed the acquisition of Nexperia’s wafer fabrication facility and operations located in Newport, South Wales, U.K. for approximately $177.5 million in cash, net of cash acquired. The wafer fabrication facility is located on 28 acres and is an automotive-certified, 200mm semiconductor wafer fab with capacity to produce more than 30,000 wafers per month.
In 2024, we acquired Nexperia's wafer fabrication facility and operations located in Newport, South Wales, U.K. for approximately $177.5 million in cash, net of cash acquired. The wafer fabrication facility is located on 28 acres and is an automotive-certified, 200mm semiconductor wafer fab with capacity to produce more than 30,000 wafers per month.
The segment operating margin decreased versus the prior year. The decreases are primarily due to gross profit margin decreases and increased segment SG&A expenses associated with the Newport wafer fab. Average selling prices decreased versus the prior year. We continue to invest to expand mid- and long-term manufacturing capacity for strategic product lines.
Segment operating margin decreased versus the prior year. The decrease is primarily due to gross profit margin decreases and increased segment SG&A expenses associated with the Newport wafer fab. Average selling prices decreased versus the prior year. We continue to invest to expand mid- and long-term manufacturing capacity for strategic product lines.
We believe we have significant liquidity to withstand temporary disruptions in the economic environment. See additional information regarding our competitive strengths and key challenges as disclosed in Part I.
We believe we have sufficient liquidity to withstand temporary disruptions in the economic environment. See additional information regarding our competitive strengths and key challenges as disclosed in Part I.
Other long-term liabilities in the table above include obligations that are reflected on our consolidated balance sheets as of December 31, 2024. We include the current portion of the long-term liabilities in the table above.
Other long-term liabilities in the table above include obligations that are reflected on our consolidated balance sheets as of December 31, 2025. We include the current portion of the long-term liabilities in the table above.
See Notes 1 and 19 to our consolidated financial statements for a description of our goodwill impairment tests. 44 Pension and Other Postretirement Benefits Our defined benefit plans are concentrated in the United States, Germany, and the Republic of China (Taiwan). At December 31, 2024, our U.S. plans include various non-qualified plans.
See Notes 1 and 19 to our consolidated financial statements for a description of our goodwill impairment tests. 43 Pension and Other Postretirement Benefits Our defined benefit plans are concentrated in the United States, Germany, and the Republic of China (Taiwan). At December 31, 2025, our U.S. plans include various non-qualified plans.
The net change of the dollar was not material when comparing 2024 versus 2023, but the dollar was weaker during 2023 versus 2022, with the translation of foreign currency revenues and expenses into U.S. dollars increasing reported revenues and expenses in 2023 versus 2022. Foreign Subsidiaries which use the U.S.
The dollar was weaker during 2025 versus 2024, with the translation of foreign currency revenues and expenses into U.S. dollars increasing reported revenues and expenses in 2025 versus 2024. The net change of the dollar was not material when comparing 2024 versus 2023. Foreign Subsidiaries which use the U.S.
Non-GAAP measures such as adjusted net earnings, adjusted earnings per share, and free cash do not have uniform definitions. These measures, as calculated by Vishay, may not be comparable to similarly titled measures used by other companies.
Non-GAAP measures such as adjusted net earnings, adjusted earnings per share, free cash, and segment operating income do not have uniform definitions. These measures, as calculated by Vishay, may not be comparable to similarly titled measures used by other companies.
For a further discussion of our long-term debt, pensions and other postretirement benefits, leases, uncertain tax positions, and purchase commitments, see Notes 2, 4, 5, 6, 11, and 13 to our consolidated financial statements. 59
For a further discussion of our long-term debt, pensions and other postretirement benefits, leases, uncertain tax positions, and purchase commitments, see Notes 4, 5, 6, 11, and 13 to our consolidated financial statements. 58
Unfavorable resolution of any particular issue could increase the effective tax rate and may require the use of cash in the year of resolution. During 2024, certain tax examinations were concluded and certain statutes of limitations lapsed. Our tax provision for those years includes adjustments related to the resolution of these matters.
Unfavorable resolution of any particular issue could increase the effective tax rate and may require the use of cash in the year of resolution. During 2025, certain tax examinations were concluded and certain statutes of limitations lapsed. Our tax provision for 2025 includes adjustments related to the resolution of these matters.
During 2023, we settled an examination of our U.S. federal income tax returns for the periods ended December 31, 2017 through 2019. Our federal income tax returns for the years 2021 through 2023 remain subject to examination.
During 2023, we settled an examination of our U.S. federal income tax returns for the periods ended December 31, 2017 through 2019. Our federal income tax returns for the years 2022 through 2024 remain subject to examination.
It also includes certain businesses that possess technologies which the Company expects to further develop and commercialize, such as MaxPower Semiconductor, Inc., acquired in 2022; businesses with well-developed technologies that the Company expects to grow using its manufacturing capabilities, capacity, and economies of scale to expand production and sell to its global customer base, such as Ametherm, Inc., acquired in 2024; and key niche suppliers to vertically integrate our supply chain, such as Birkelbach Kondensatortechnik GmbH ("Birkelbach"), acquired in 2024, and Centerline Technologies, LLC, acquired in 2023.
It also includes certain businesses that possess technologies which the Company expects to further develop and commercialize, businesses with well-developed technologies that the Company expects to grow using its manufacturing capabilities, capacity, and economies of scale to expand production and sell to its global customer base, such as Ametherm, Inc., acquired in 2024; and key niche suppliers to vertically integrate our supply chain, such as Birkelbach Kondensatortechnik GmbH, acquired in 2024.
The revised structure incentivizes daily behaviors and actions of our organizational leaders to create immediate growth in line with our cross-functional business objectives. Under the new structure, organizational leaders will be rewarded annually for meeting determined targets in revenue, operating margin, gross margin, and variable margin.
The revised structure incentivizes daily behaviors and actions of our organizational leaders to create immediate growth in line with our cross-functional business objectives. Under the structure, organizational leaders are rewarded annually for meeting determined targets in revenue, operating margin, gross margin, and variable margin.
Accordingly, we have classified all non-current uncertain tax positions as payments due thereafter, although actual timing of payments may be sooner. Expected pension and postretirement plan funding is based on a projected schedule of benefit payments under the plans.
Accordingly, we have classified all non-current uncertain tax positions as payments due thereafter, although actual timing of payments may be sooner. Expected pension and postretirement plan funding is based on a projected schedule of benefit payments under the plans adjusted for payments from fully-funded plans.
As of December 31, 2024, we have approximately $515 million of German and Israeli earnings that are deemed not indefinitely reinvested. Based on the expected timing of future repatriations, we estimate that the tax liability to repatriate these unremitted earnings will be approximately $77 million, which has been accrued, but will only be paid upon repatriation of the unremitted earnings.
As of December 31, 2025, we have approximately $493 million of German and Israeli earnings that are deemed not indefinitely reinvested. Based on the expected timing of future repatriations, we estimate that the tax liability to repatriate these unremitted earnings will be approximately $76 million, which has been accrued, but will only be paid upon repatriation of the unremitted earnings.
The cost of products sold and selling, general, and administrative expense have been favorably impacted for the year ended December 31, 2024 compared to 2023 and for the year ended December 31, 2023 compared to 2022 by local currency transactions of subsidiaries which use the U.S. dollar as their functional currency.
The cost of products sold and selling, general, and administrative expense have been unfavorably impacted for the year ended December 31, 2025 compared to 2024 by local currency transactions of subsidiaries which use the U.S. dollar as their functional currency.
The tax returns of significant non-U.S. subsidiaries currently under examination are located in the following jurisdictions: Israel (2021), Germany (2017 through 2021), India (2004 through 2021), and Philippines (2017 through 2023). The Company and its subsidiaries also file income tax returns in other taxing jurisdictions in the U.S. and around the world, many of which are still open to examination.
The tax returns of significant non-U.S. subsidiaries currently under examination are located in the following jurisdictions: Israel (2021), China (2022 through 2024), India (2004 through 2023), and Philippines (2020 through 2022). The Company and its subsidiaries also file income tax returns in other taxing jurisdictions in the U.S. and around the world, many of which are still open to examination.
We expect that free cash flow will be negatively impacted by the expected high level of capital expenditures for expansion in 2023 - 2025 after which we expect to generate increasingly higher levels of free cash.
We expect free cash flow will be negatively impacted by the expected high level of capital expenditures for expansion after which we expect to generate increasingly higher levels of free cash.
Segment operating income would also exclude costs not routinely used in the management of the segments in periods when those items are present, such as restructuring and severance costs, goodwill impairment charges, the direct impact of the COVID-19 pandemic, and other items affecting comparability.
Segment operating income would also exclude costs not routinely used in the management of the segments in periods when those items are present, such as restructuring and severance costs, goodwill impairment charges, and other items affecting comparability.
We are focused on enhancing stockholder value by growing our business and improving earnings per share. Since 1985, we have pursued a business strategy of growth through focused research and development and acquisitions. We plan to continue to grow our business through intensified internal growth supplemented by opportunistic acquisitions, while maintaining a prudent capital structure.
Our goal is to enhance stockholder value by growing our business and improving earnings per share. Since 1985, we have pursued a business strategy of growth through focused research and development and acquisitions. We plan to continue to grow our business through intensified internal growth supplemented by opportunistic acquisitions, while maintaining a prudent capital structure.
We believe that we have a reasonable basis to estimate future credits under the programs. See Notes 1 and 9 to our consolidated financial statements for further information. Inventories We value our inventories at the lower of cost or net realizable value, with cost determined under the first-in, first-out method.
We believe that we have a reasonable basis to estimate future credits under the programs. See Notes 1 and 15 to our consolidated financial statements for further information. Inventories We value our inventories at the lower of cost or net realizable value, with cost determined using moving average and the first-in, first-out methods.
Cash flows provided by operating activities were $173.7 million for the year ended December 31, 2024, as compared to cash flows provided by operations of $365.7 million for the year ended December 31, 2023. In order to manage our working capital and operating cash needs, we monitor our cash conversion cycle.
Cash flows provided by operating activities were $184.3 million for the year ended December 31, 2025, as compared to cash flows provided by operating activities of $173.7 million for the year ended December 31, 2024. In order to manage our working capital and operating cash needs, we monitor our cash conversion cycle.
We continue to broaden our business with targeted acquisitions of specialty resistors businesses. 51 Inductors Net revenues of the Inductors segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 356,355 $ 347,392 $ 331,086 Change versus comparable prior year period $ 8,963 $ 16,306 Percentage change versus comparable prior year period 2.6 % 4.9 % Changes in Inductors segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Increase in volume 4.8 % 2.4 % Change in average selling prices (2.2 )% 1.9 % Foreign currency effects 0.0 % 0.5 % Other 0.0 % 0.1 % Net change 2.6 % 4.9 % Gross profit margins and segment operating margins for the Inductors segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 30.0 % 32.4 % 31.5 % Segment operating margin 25.9 % 28.7 % 28.2 % Net revenues of the Inductors segment increased slightly versus the prior year.
We continue to broaden our business with targeted acquisitions of specialty resistors businesses. 50 Inductors Net revenues of the Inductors segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 364,374 $ 356,355 $ 347,392 Change versus comparable prior year period $ 8,019 $ 8,963 Percentage change versus comparable prior year period 2.3 % 2.6 % Changes in Inductors segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Increase in volume 0.2 % 4.8 % Change in average selling prices 1.4 % (2.2 )% Foreign currency effects 0.7 % 0.0 % Net change 2.3 % 2.6 % Gross profit margins and segment operating margins for the Inductors segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 27.5 % 30.0 % 32.4 % Segment operating margin 23.3 % 25.9 % 28.7 % Net revenues of the Inductors segment increased slightly in 2025 versus the prior year.
Our free cash results were significantly impacted by the installment payments of the U.S. transition tax of $37.6 million in 2024, $27.7 million in 2023, and $14.8 million in 2022, respectively, and payments of foreign, withholding, and claw-back cash taxes of $15.0 million in 2024, $63.6 million in 2023, and $25.2 million in 2022 on foreign earnings of $105.0 million, $276.8 million, and $81.2 million (net of taxes) that were repatriated to the U.S. in 2024, 2023, and 2022, respectively. 34 Growth and Company Transformation Initiatives Effective January 1, 2023, a new executive leadership team, promoted from within, embarked on a new era at Vishay ("Vishay 3.0").
Our free cash results were significantly impacted by the installment payments of the U.S. transition tax of $47.0 million in 2025, $37.6 million in 2024, and $27.7 million in 2023, respectively, and payments of foreign and withholding cash taxes of $9.4 million in 2025, $15.0 million in 2024, and $63.6 million in 2023 on foreign earnings of $75.0 million, $105.0 million, and $276.8 million that were repatriated to the U.S. in 2025, 2024, and 2023, respectively. 34 Growth and Company Transformation Initiatives Effective January 1, 2023, a new executive leadership team, promoted from within, embarked on a new era at Vishay ("Vishay 3.0").
We expect that our effective tax rate will be higher than the U.S. statutory rate, excluding unusual transactions. Our GAAP effective tax rate for the year ended December 31, 2024 is not meaningful at the low levels of pre-tax loss.
We expect that our effective tax rate will be higher than the U.S. statutory rate, excluding unusual transactions. Our GAAP effective tax rates for the years ended December 31, 2025 and 2024 are not meaningful at the low levels of pre-tax loss.
See Item 7A for additional discussion of foreign currency exchange risk. 43 Critical Accounting Policies and Estimates Our significant accounting policies are summarized in Note 1 to our consolidated financial statements. We identify here a number of policies that entail significant judgments or estimates.
See Item 7A for additional discussion of foreign currency exchange risk and forward contracts used to mitigate certain foreign currency risks. 42 Critical Accounting Policies and Estimates Our significant accounting policies are summarized in Note 1 to our consolidated financial statements. We identify here a number of policies that entail significant judgments or estimates.
Borrowings under the credit facility bear interest at variable reference rates plus an interest margin. The applicable interest margin is based on our total leverage ratio. We also pay a commitment fee, also based on our total leverage ratio, on undrawn amounts. U.S. dollar borrowings under the credit facility are based on SOFR (including a customary spread adjustment).
We also pay a commitment fee, also based on our total leverage ratio, on undrawn amounts. U.S. dollar borrowings under the credit facility are based on SOFR (including a customary spread adjustment). Borrowings in foreign currencies bear interest at currency-specific reference rates plus an interest margin.
The average outstanding balance on our revolving credit facility calculated at fiscal month-ends was $34 million and the highest amount outstanding at a fiscal month end was $136 million during the fiscal year ended December 31, 2024.
The average outstanding balance on our revolving credit facility calculated at fiscal month-ends was $220 million and the highest amount outstanding at a fiscal month end was $309 million during the fiscal year ended December 31, 2025.
Average selling prices decreased versus the prior year. 50 Resistors Net revenues of the Resistors segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 725,614 $ 843,472 $ 832,806 Change versus comparable prior year period $ (117,858 ) $ 10,666 Percentage change versus comparable prior year period (14.0 )% 1.3 % Changes in Resistors segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (12.0 )% (1.4 )% Change in average selling prices (3.0 )% 1.8 % Foreign currency effects 0.0 % 1.0 % Acquisitions 0.5 % 0.0 % Other 0.5 % (0.1 )% Net change (14.0 )% 1.3 % Gross profit margins and segment operating margins for the Resistors segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 21.9 % 28.3 % 31.5 % Segment operating margin 17.3 % 24.8 % 28.2 % Net revenues of the Resistors segment decreased significantly versus the prior year.
Average selling prices decreased versus the prior year. 49 Resistors Net revenues of the Resistors segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 759,343 $ 725,614 $ 843,472 Change versus comparable prior year period $ 33,729 $ (117,858) Percentage change versus comparable prior year period 4.6 % (14.0 )% Changes in Resistors segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 3.8 % (12.0 )% Decrease in average selling prices (1.1 )% (3.0 )% Foreign currency effects 1.6 % 0.0 % Acquisitions 0.4 % 0.5 % Other (0.1 )% 0.5 % Net change 4.6 % (14.0 )% Gross profit margins and segment operating margins for the Resistors segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 21.2 % 21.9 % 28.3 % Segment operating margin 16.2 % 17.3 % 24.8 % Net revenues of the Resistors segment increased in 2025 versus the prior year.
As of December 31, 2024, we are in a net borrowing position in the U.S. and we expect to continue to be at least through the first half of 2025 based on expected cash payments pursuant to our Stockholder Return Policy and funding of the Newport expansion.
As of December 31, 2025, we are in a net borrowing position in the U.S. and we expect to continue to be at least through 2026 based on expected cash payments pursuant to our Stockholder Return Policy and funding of our growth plan.
We expect long-term growth in this segment, and are continuously expanding manufacturing capacity for certain product lines and evaluating acquisition opportunities, particularly of specialty businesses. 52 Capacitors Net revenues of the Capacitors segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 459,296 $ 498,741 $ 509,645 Change versus comparable prior year period $ (39,445 ) $ (10,904) Percentage change versus comparable prior year period (7.9 )% (2.1 )% Changes in Capacitors segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (7.2 )% (5.1 )% Change in average selling prices (0.5 )% 2.2 % Foreign currency effects 0.0 % 0.9 % Other (0.2 )% (0.1 )% Net change (7.9 )% (2.1 )% Gross profit margins and segment operating margins for the Capacitors segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 24.8 % 25.3 % 24.3 % Segment operating margin 19.7 % 21.1 % 20.6 % Net revenues of the Capacitors segment decreased versus the prior year.
We expect long-term growth in this segment, and are continuously expanding manufacturing capacity for certain product lines and evaluating acquisition opportunities, particularly of specialty businesses. 51 Capacitors Net revenues of the Capacitors segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 505,560 $ 459,296 $ 498,741 Change versus comparable prior year period $ 46,264 $ (39,445) Percentage change versus comparable prior year period 10.1 % (7.9 )% Changes in Capacitors segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 5.3 % (7.2 )% Change in average selling prices 1.2 % (0.5 )% Foreign currency effects 2.1 % 0.0 % Acquisitions 1.1 % 0.0 % Other 0.4 % (0.2 )% Net change 10.1 % (7.9 )% Gross profit margins and segment operating margins for the Capacitors segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 21.5 % 24.8 % 25.3 % Segment operating margin 16.4 % 19.7 % 21.1 % Net revenues of the Capacitors segment increased significantly in 2025 versus the prior year.
MOSFETs Net revenues of the MOSFETs segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 601,979 $ 778,754 $ 762,260 Change versus comparable prior year period $ (176,775 ) $ 16,494 Percentage change versus comparable prior year period (22.7 )% 2.2 % Changes in MOSFETs segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (17.4 )% (1.8 )% Change in average selling prices (11.0 )% 2.3 % Foreign currency effects 0.0 % 0.5 % Acquisition 3.9 % 1.0 % Other 1.8 % 0.2 % Net change (22.7 )% 2.2 % Gross profit margins and segment operating margins for the MOSFETs segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 14.5 % 33.3 % 36.0 % Segment operating margin 1.1 % 25.1 % 30.0 % Net revenues of the MOSFETs segment decreased significantly in 2024 versus the prior year.
MOSFETs Net revenues of the MOSFETs segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 630,463 $ 601,979 $ 778,754 Change versus comparable prior year period $ 28,484 $ (176,775) Percentage change versus comparable prior year period 4.7 % (22.7 )% Changes in MOSFETs segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 10.8 % (17.4 )% Decrease in average selling prices (6.2 )% (11.0 )% Foreign currency effects 0.6 % 0.0 % Acquisition 0.3 % 3.9 % Other (0.8 )% 1.8 % Net change 4.7 % (22.7 )% Gross profit margins and segment operating margins for the MOSFETs segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 9.8 % 14.5 % 33.3 % Segment operating margin (4.8 )% 1.1 % 25.1 % Net revenues of the MOSFETs segment increased in 2025 versus the prior year.
During the second fiscal quarter of 2024, we repatriated $120 million of accumulated earnings to the United States and paid withholding taxes in Israel of $15 million. As of December 31, 2024, $17 million of our cash and cash equivalents and short-term investments were held by our U.S. subsidiaries.
During the second fiscal quarter of 2025, we repatriated $75 million of accumulated earnings to the United States and paid withholding taxes in Israel of $9.4 million. As of December 31, 2025, $13.4 million of our cash and cash equivalents and short-term investments were held by our U.S. subsidiaries.
Average selling prices decreased versus the prior year. 49 O ptoelectronic Components Net revenues of the Optoelectronic Components segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 212,368 $ 243,146 $ 296,384 Change versus comparable prior year period $ (30,778 ) $ (53,238 ) Percentage change versus comparable prior year period (12.7 )% (18.0 )% Changes in Optoelectronic Components segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (10.5 )% (19.2 )% Change in average selling prices (2.5 )% 0.5 % Foreign currency effects 0.1 % 0.9 % Other 0.2 % (0.2 )% Net change (12.7 )% (18.0 )% Gross profit margins and segment operating margins for the Optoelectronic Components segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 18.0 % 25.6 % 34.7 % Segment operating margin 7.9 % 17.7 % 28.8 % Net revenues of the Optoelectronic Components segment decreased versus the prior year.
Average selling prices decreased versus the prior year. 48 O ptoelectronic Components Net revenues of the Optoelectronic Components segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 216,551 $ 212,368 $ 243,146 Change versus comparable prior year period $ 4,183 $ (30,778 ) Percentage change versus comparable prior year period 2.0 % (12.7 )% Changes in Optoelectronic Components segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 0.4 % (10.5 )% Decrease in average selling prices (0.2 )% (2.5 )% Foreign currency effects 1.9 % 0.1 % Other (0.1 )% 0.2 % Net change 2.0 % (12.7 )% Gross profit margins and segment operating margins for the Optoelectronic Components segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 20.5 % 18.0 % 25.6 % Segment operating margin 10.1 % 7.9 % 17.7 % Net revenues of the Optoelectronic Components segment increased in 2025 versus the prior year.
The new executive management team laid out a three-year plan to expand capacity to support our highest growth and highest return product lines and to position Vishay to be ready for the next phase of megatrends in e-mobility, sustainability, and connectivity.
The new executive management team laid out a three-year plan to expand capacity to support our highest growth and highest return product lines and to position Vishay to be ready for the next phase of megatrends in e-mobility, sustainability, and connectivity. 2023 was the staging year for this plan as all elements of the plan progressed throughout the organization.
The increase is primarily due to increased sales to EMS customers, medical, and military and aerospace end market customers, and customers in the Americas and Asia regions, partially offset by decreased sales to industrial and automotive end market customers and customers in the Europe region. The gross profit margin decreased versus the prior year.
The increase is primarily due to increased sales to distribution customers, industrial and telecommunications end market customers, and customers in the Asia region, partially offset by decreased sales to military and aerospace end market customers. Gross profit margin decreased versus the prior year.
The reconciliations below include certain financial measures which are not recognized in accordance with GAAP, including adjusted net earnings, adjusted earnings per share, and free cash. These non-GAAP measures should not be viewed as alternatives to GAAP measures of performance or liquidity.
The reconciliations below include certain financial measures which are not recognized in accordance with GAAP, including adjusted net earnings, adjusted earnings per share, and free cash. Note 15 to our consolidated financial statements includes the reconciliation for segment operating income. These non-GAAP measures should not be viewed as alternatives to GAAP measures of performance or liquidity.
At the same time, we are enhancing our channel management while investing in internal resources by adding customer-facing engineers and filling gaps in technology and market coverage. Taken together, each of these initiatives supports our Think Customer First organizational structure. To increase our internal capacity, we had planned to invest approximately $435 million in 2024.
At the same time, we are enhancing our channel management while investing in internal resources by adding customer-facing engineers and filling gaps in technology and market coverage. Taken together, each of these initiatives supports our Think Customer First organizational culture.
Additional information about income taxes is included in Note 5 to our consolidated financial statements. 55 Financial Condition, Liquidity, and Capital Resources Our financial condition as of December 31, 2024 continued to be strong. We have historically been a strong generator of operating cash flows.
Additional information about income taxes is included in Note 5 to our consolidated financial statements. 54 Financial Condition, Liquidity, and Capital Resources Our financial condition as of December 31, 2025 is adequate to meet our capital expenditure and other growth plans. We have historically been a strong generator of operating cash flows.
We continue to pursue our growth plans through investing in capacities for strategic product lines, and through increasing our resources for R&D, technical marketing, and field application engineering; supplemented by opportunistic acquisitions of specialty businesses.
Even as we seek to manage our costs, we remain cognizant of the future requirements of our demanding markets. We continue to pursue our growth plans through investing in capacities for strategic product lines, and through increasing our resources for R&D, technical marketing, and field application engineering; supplemented by opportunistic acquisitions of specialty businesses.
The following table presents the components of our cash conversion cycle during the five fiscal quarters beginning with the fourth fiscal quarter of 2023 through the fourth fiscal quarter of 2024: 4th Quarter 2023 1st Quarter 2024 2nd Quarter 2024 3rd Quarter 2024 4th Quarter 2024 Days sales outstanding ("DSO") (a) 50 51 51 53 53 Days inventory outstanding ("DIO") (b) 101 104 105 106 109 Days payable outstanding ("DPO") (c) (31 ) (31 ) (31 ) (32 ) (34 ) Cash conversion cycle 120 124 125 127 128 a) DSO measures the average collection period of our receivables.
The following table presents the components of our cash conversion cycle during the five fiscal quarters beginning with the fourth fiscal quarter of 2024 through the fourth fiscal quarter of 2025: 4th Quarter 2024 1st Quarter 2025 2nd Quarter 2025 3rd Quarter 2025 4th Quarter 2025 Days sales outstanding ("DSO") (a) 53 53 53 53 48 Days inventory outstanding ("DIO") (b) 109 110 109 108 107 Days payable outstanding ("DPO") (c) (34 ) (34 ) (32 ) (31 ) (30 ) Cash conversion cycle 128 129 130 130 125 a) DSO measures the average collection period of our receivables.
The decrease is due to lower sales volume, decreased average selling prices, higher labor and tantalum costs, partially offset by a favorable product mix, and decreased utilities costs. Segment operating margin decreased versus the prior year. The decrease is primarily due to decreased gross profit. Average selling prices have decreased slightly versus the prior year.
The decrease is primarily due to higher material and fixed costs, partially offset by higher sales volume and increased average selling prices. Segment operating margin decreased versus the prior year. The decrease is primarily due to decreased gross profit. Average selling prices have increased slightly versus the prior year.
The following table analyzes the components of the line “Other” on the consolidated statements of operations (in thousands): Years ended December 31, 2024 2023 Change Foreign exchange gain (loss) $ 774 $ 677 $ 97 Interest income 25,479 31,353 (5,874 ) Other components of net periodic pension expense (7,899 ) (8,730 ) 831 Investment income (519 ) 1,347 (1,866 ) Other 1,629 616 1,013 $ 19,464 $ 25,263 $ (5,799 ) 2023 Compared to 2022 Interest expense for the year ended December 31, 2023 increased by $ 8.0 million versus the year ended December 31, 2022.
The following table analyzes the components of the line “Other” on the consolidated statements of operations (in thousands): Years ended December 31, 2024 2023 Change Foreign exchange gain $ 774 $ 677 $ 97 Interest income 25,479 31,353 (5,874 ) Other components of net periodic pension expense (7,899 ) (8,730 ) 831 Investment income (loss) (519 ) 1,347 (1,866 ) Other 1,629 616 1,013 $ 19,464 $ 25,263 $ (5,799 ) 53 Income Taxes For the years ended December 31, 2025, 2024, and 2023, the effective tax rates were 135.2%, (1,145.5)%, and 30.4%, respectively.
The following table summarizes the components of net cash and short-term investments (debt) (in thousands) : December 31, 2024 December 31, 2023 Credit facility $ 136,000 $ - Convertible senior notes, due 2025 41,911 95,102 Convertible senior notes, due 2030 750,000 750,000 Deferred financing costs (22,892 ) (26,914 ) Total debt 905,019 818,188 Cash and cash equivalents 590,286 972,719 Short-term investments 16,130 35,808 Net cash and short-term investments (debt) $ (298,603 ) $ 190,339 "Net cash and short-term investments (debt)" does not have a uniform definition and is not recognized in accordance with GAAP.
The following table summarizes the components of net cash and short-term investments (debt) (in thousands) : December 31, 2025 December 31, 2024 Credit facility $ 219,000 $ 136,000 Convertible senior notes, due 2025 - 41,911 Convertible senior notes, due 2030 750,000 750,000 Deferred financing costs (18,107 ) (22,892 ) Total debt 950,893 905,019 Cash and cash equivalents 514,966 590,286 Short-term investments 265 16,130 Net cash and short-term investments (debt) $ (435,662 ) $ (298,603 ) "Net cash and short-term investments (debt)" does not have a uniform definition and is not recognized in accordance with GAAP.
We had no amount outstanding on our revolving credit facility at December 31, 2023 and $136 million outstanding at December 31, 2024. We borrowed $183 million and repaid $47 million on the revolving credit facility during the fiscal year ended December 31, 2024.
We had $136 million outstanding on our revolving credit facility at December 31, 2024 and $219 million outstanding at December 31, 2025. We borrowed $832 million and repaid $749 million on the revolving credit facility during the fiscal year ended December 31, 2025.
Pursuant to the indenture governing the convertible senior notes due 2030, we will cash-settle the principal amount of $1,000 per note and settle any additional amounts in cash or shares of our common stock.
Pursuant to the indenture governing the convertible senior notes due 2030, we will cash-settle the principal amount of $1,000 per note and settle any additional amounts in cash or shares of our common stock. We intend to finance the principal amount of any converted notes using borrowings under our credit facility. No conversions have occurred to date.
Such costs are expected to be significantly higher if business results meet or exceed expectations. In September 2024, we announced restructuring actions designed, in part, to optimize our manufacturing footprint and streamline business decision making. We recognized restructuring expense pursuant to on-going benefit arrangements of $40.6 million in 2024.
In September 2024, we announced restructuring actions designed, in part, to optimize our manufacturing footprint and streamline business decision making. We recognized restructuring expense pursuant to on-going benefit arrangements of $40.6 million in 2024.
If we are not in compliance with all of the required financial covenants, the credit facility could be terminated by the lenders, and any amounts then outstanding pursuant to the credit facility could become immediately payable.
Based on our current EBITDA and outstanding revolver balance, the usable capacity on the credit facility is approximately $254 million. If we are not in compliance with all of the required financial covenants, the credit facility could be terminated by the lenders, and any amounts then outstanding pursuant to the credit facility could become immediately payable.
The erosion of average selling prices, particularly of our semiconductor products, that is typical of our industry, and inflation negatively impact contributive margin and drive us to continually seek ways to reduce our variable costs.
Over a period of many years, we have generally maintained a contributive margin of between 45% and 47% of revenues. The erosion of average selling prices, particularly of our semiconductor products, that is typical of our industry, and inflation negatively impact contributive margin and drive us to continually seek ways to reduce our variable costs.
Segment operating margin decreased significantly versus the prior year primarily due to decreased gross profit and increased SG&A costs.
Segment operating margin decreased versus the prior year primarily due to decreased gross profit.
For 2025, we plan to spend between $300 million to $350 million, at least 70% of which will be invested in capacity expansion projects for high growth product lines, including our wafer fab expansions. Free cash flow for the year ended December 31, 2024 decreased versus the year ended December 31, 2023 primarily due to decreased net earnings.
For 2026, we plan to spend between $400 million to $440 million, at least 70% of which will be invested in capacity expansion projects for high growth product lines, including our wafer fab expansions. Free cash flow for the years ended December 31, 2025 and December 31, 2024 were negative primarily due to high levels of capital expenditures for expansion.
Commitments for interest payments on long-term debt are cash commitments based on the stated maturity dates of each agreement and include fees under our revolving credit facility, which expires on May 8, 2028. Commitments for interest payments on long-term debt exclude non-cash interest expense related to the amortization of deferred financing costs.
Accordingly, the capitalized deferred financing costs associated with our long-term debt are excluded from the calculation of long-term debt commitments in the table above. Commitments for interest payments on long-term debt are cash commitments based on the stated maturity dates of each agreement and include fees under our revolving credit facility, which expires on May 8, 2028.
See Notes 1 and 5 to consolidated financial statements for additional information. 46 Results of Operations Statement of operations’ captions as a percentage of net revenues and the effective tax rates were as follows: Years ended December 31, 2024 2023 2022 Costs of products sold 78.7 % 71.4 % 69.7 % Gross profit 21.3 % 28.6 % 30.3 % Selling, general, and administrative expenses 17.5 % 14.4 % 12.7 % Operating income 0.2 % 14.3 % 17.6 % Income (loss) before taxes and noncontrolling interest (0.1 )% 13.7 % 17.0 % Net earnings (loss) attributable to Vishay stockholders (1.1 )% 9.5 % 12.3 % ________ Effective tax rate (1,145.5 )% 30.4 % 27.5 % Net Revenues Net revenues were as follows (dollars in thousands) : 2024 2023 2022 Net revenues $ 2,937,587 $ 3,402,045 $ 3,497,401 Change versus prior year $ (464,458 ) $ (95,356) Percentage change versus prior year (13.7 )% (2.7 )% Changes in net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (10.9 )% (5.2 )% Change in average selling prices (4.2 )% 1.7 % Foreign currency effects 0.0 % 0.7 % Acquisitions 1.0 % 0.2 % Other 0.4 % (0.1 )% Net change (13.7 )% (2.7 )% Despite the inventory correction that we are experiencing, the long-term prospects for our business remain favorable, and we continue to increase manufacturing capacities for critical product lines.
See Notes 1 and 5 to consolidated financial statements for additional information. 45 Results of Operations Statement of operations’ captions as a percentage of net revenues and the effective tax rates were as follows: Years ended December 31, 2025 2024 2023 Costs of products sold 80.6 % 78.7 % 71.4 % Gross profit 19.4 % 21.3 % 28.6 % Selling, general, and administrative expenses 17.5 % 17.5 % 14.4 % Operating income 1.9 % 0.2 % 14.3 % Income (loss) before taxes and noncontrolling interest 0.8 % (0.1 )% 13.7 % Net earnings (loss) attributable to Vishay stockholders (0.3 )% (1.1 )% 9.5 % ________ Effective tax rate 135.2 % (1,145.5 )% 30.4 % Net Revenues Net revenues were as follows (dollars in thousands) : 2025 2024 2023 Net revenues $ 3,069,048 $ 2,937,587 $ 3,402,045 Change versus prior year $ 131,461 $ (464,458) Percentage change versus prior year 4.5 % (13.7 )% Changes in net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 4.9 % (10.9 )% Decrease in average selling prices (1.9 )% (4.2 )% Foreign currency effects 1.3 % 0.0 % Acquisitions 0.3 % 1.0 % Other (0.1 )% 0.4 % Net change 4.5 % (13.7 )% For most of 2024 and 2025, we operated in a challenging environment, in part due to distribution customers digesting high channel inventories.
The acquisition of Nexperia's Newport fab in 2024 will enhance the manufacturing capacity and capabilities of our MOSFETs segment. The facility added significant depreciation and other costs to our MOSFETs segment. The facility is generating a loss and we expect it to continue to generate a loss while we invest in new equipment and qualify new products.
The acquisition of Nexperia's Newport fab in 2024 will enhance the manufacturing capacity and capabilities of our MOSFETs segment. The facility added significant depreciation and other costs to our MOSFETs segment. The facility has generated losses while we invested in new equipment and qualified new products. We expect the facility to start generating profit in 2026.
Gross Profit and Margins Gross profit margins for the year ended December 31, 2024 were 21.3%, as compared to 28.6% for the year ended December 31, 2023. The decrease in gross profit margin is primarily due to lower sales volume, decreased average selling prices, and the impact of the Newport acquisition.
The decrease in net revenues in 2024 was primarily due to lower sales volume and decreased average selling prices. Gross Profit and Margins Gross profit margins for the year ended December 31, 2025 were 19.4%, as compared to 21.3% for the year ended December 31, 2024.
The decrease is primarily due to decreased sales to distribution customers, customers in the industrial and automotive end markets, and customers in the Americas and Europe regions, partially offset by increased sales to customers in the Asia region. The gross profit margin decreased slightly versus the prior year.
The increase is primarily due to increased sales to distribution customers, industrial and automotive end market customers, and customers in the Asia and Americas regions. Gross profit margin decreased versus the prior year. The decrease is due to decreased average selling prices and higher materials costs, partially offset by higher sales volume. Segment operating margin decreased versus the prior year.
Various factors could have a material effect on the amount of future principal and interest payments. Principal and interest commitments associated with our convertible notes are based on the amounts outstanding as of December 31, 2024.
Commitments for interest payments on long-term debt exclude non-cash interest expense related to the amortization of deferred financing costs. Various factors could have a material effect on the amount of future principal and interest payments. Principal and interest commitments associated with our convertible notes are based on the amounts outstanding as of December 31, 2025.
The decrease is primarily due to decreased sales to distribution customers and customers in the industrial, power supply, and automotive end markets. The gross profit margin in 2024 decreased versus the prior year primarily due to lower sales volume and decreased average selling prices. Costs associated with the Newport wafer fab also contributed to decreases versus the prior year.
The increase is primarily due to increased sales to distribution customers, computing end market customers, and customers in the Asia region. Gross profit margin decreased versus the prior year primarily due to decreased average selling prices, partially offset by higher sales volume. Costs associated with the Newport wafer fab also contributed to the decrease versus the prior year.
To drive growth and optimize stockholder value, we plan to capitalize on the mega trends of e-mobility, sustainability, and connectivity through initiatives. We are developing go-to-market strategies and investing in and expanding the key product lines for growth that we have identified. In addition, we are strategically expanding our outsourced production of commodity products to subcontractors.
We have developed go-to-market strategies and are investing in and expanding the key product lines for growth that we have identified. In addition, we are strategically expanding our outsourced production of commodity products to subcontractors.
Additional acquisition activity, convertible debt repurchases, or conversion of our convertible debt instruments may require additional borrowing under our credit facility or may otherwise require us to incur additional debt.
Additional acquisition activity, convertible debt repurchases, or conversion of our convertible debt instruments may require additional borrowing under our credit facility or may otherwise require us to incur additional debt. No principal amounts of our debt are due until 2028. The convertible senior notes due 2030 are not currently convertible.
Despite the goodwill impairment charge recorded in 2024, we remain committed to these long-term projects. 48 Diodes Net revenues of the Diodes segment were as follows (dollars in thousands): Years ended December 31, 2024 2023 2022 Net revenues $ 581,975 $ 690,540 $ 765,220 Change versus comparable prior year period $ (108,565 ) $ (74,680 ) Percentage change versus comparable prior year period (15.7 )% (9.8 )% Changes in Diodes segment net revenues were attributable to the following: 2024 vs. 2023 2023 vs. 2022 Change attributable to: Decrease in volume (13.1 )% (11.0 )% Change in average selling prices (3.0 )% 1.0 % Foreign currency effects (0.1 )% 0.4 % Other 0.5 % (0.2 )% Net change (15.7 )% (9.8 )% Gross profit margins and segment operating margins for the Diodes segment were as follows: Years ended December 31, 2024 2023 2022 Gross profit margin 20.8 % 25.4 % 25.9 % Segment operating margin 16.5 % 22.2 % 23.1 % Net revenues of the Diodes segment decreased significantly in 2024.
These are long-term investments which were not expected to generate significant income or cash flows in the near-term, but should greatly enhance the long-term position of our MOSFETs business. 47 Diodes Net revenues of the Diodes segment were as follows (dollars in thousands): Years ended December 31, 2025 2024 2023 Net revenues $ 592,757 $ 581,975 $ 690,540 Change versus comparable prior year period $ 10,782 $ (108,565 ) Percentage change versus comparable prior year period 1.9 % (15.7 )% Changes in Diodes segment net revenues were attributable to the following: 2025 vs. 2024 2024 vs. 2023 Change attributable to: Change in volume 4.7 % (13.1 )% Decrease in average selling prices (3.5 )% (3.0 )% Foreign currency effects 1.0 % (0.1 )% Other (0.3 )% 0.5 % Net change 1.9 % (15.7 )% Gross profit margins and segment operating margins for the Diodes segment were as follows: Years ended December 31, 2025 2024 2023 Gross profit margin 20.1 % 20.8 % 25.4 % Segment operating margin 15.1 % 16.5 % 22.2 % Net revenues of the Diodes segment increased in 2025 versus the prior year.
The decrease is primarily due to lower average selling prices and higher logistics and labor costs. Segment operating margin decreased versus the prior year. The decrease is primarily due to decreased gross profit. Average selling prices decreased versus the prior year.
The decrease is primarily due to decreased gross profit. Average selling prices increased versus the prior year.
The following table shows net revenues, gross profit margin, operating margin, end-of-period backlog, book-to-bill ratio, inventory turnover, and changes in ASP for our business as a whole during the five fiscal quarters beginning with the fourth fiscal quarter of 2023 through the fourth fiscal quarter of 2024 (dollars in thousands) : 4th Quarter 2023 1st Quarter 2024 2nd Quarter 2024 3rd Quarter 2024 4th Quarter 2024 Net revenues $ 785,236 $ 746,279 $ 741,239 $ 735,353 $ 714,716 Gross profit margin 25.6 % 22.8 % 22.0 % 20.5 % 19.9 % Operating margin (1) 9.9 % 5.7 % 5.1 % (2.5 )% (7.9 )% End-of-period backlog $ 1,381,800 $ 1,253,400 $ 1,145,400 $ 1,075,800 $ 1,051,500 Book-to-bill ratio 0.75 0.82 0.86 0.88 1.01 Inventory turnover 3.6 3.5 3.4 3.4 3.3 Change in ASP vs. prior quarter (0.7 )% (2.5 )% (0.7 )% (1.0 )% (0.6 )% _______________ (1) Operating margin for the third fiscal quarter of 2024 includes $40.6 million of restructuring and severance expenses (see Note 3 to our consolidated financial statements).
The following table shows net revenues, gross profit margin, operating margin, end-of-period backlog, book-to-bill ratio, inventory turnover, and changes in ASP for our business as a whole during the five fiscal quarters beginning with the fourth fiscal quarter of 2024 through the fourth fiscal quarter of 2025 (dollars in thousands) : 4th Quarter 2024 1st Quarter 2025 2nd Quarter 2025 3rd Quarter 2025 4th Quarter 2025 Net revenues $ 714,716 $ 715,236 $ 762,250 $ 790,640 $ 800,922 Gross profit margin 19.9 % 19.0 % 19.5 % 19.5 % 19.6 % Operating margin (1) (7.9 )% 0.1 % 2.9 % 2.4 % 1.8 % End-of-period backlog $ 1,051,500 $ 1,124,300 $ 1,174,900 $ 1,152,700 $ 1,314,100 Book-to-bill ratio 1.01 1.08 1.02 0.97 1.20 Inventory turnover 3.3 3.3 3.3 3.3 3.4 Change in ASP vs. prior quarter (0.6 )% (1.3 )% 0.0 % (0.3 )% (0.3 )% _______________ (1) Operating margin for the second fiscal quarter of 2025 includes an $11.3 million gain recognized upon the favorable resolution of a contingency (See Note 2 to our consolidated financial statements).
The decrease versus the prior year is due to decreased sales in all regions to distribution and EMS customers and industrial, automotive, and power supply end market customers. Gross profit margin decreased significantly versus the prior year primarily due to lower sales volume, decreased average selling prices, and higher materials, labor, and fixed costs.
The increase versus the prior year is primarily due to increased sales to distribution customers, industrial and power supply end market customers, and customer in the Europe region. Gross profit margin decreased versus the prior year primarily due to decreased average selling prices, partially offset by higher sales volume.
Managers will be able to earn up to 130% of their former STI bonus targets for results which exceed expectations. The better alignment of the STI program with business results creates higher volatility in costs. The industry downturn that led to results that were below expectations in 2024 led to relatively low bonus accruals and thus lower reported SG&A expenses.
Managers are able to earn up to 130% of their former STI bonus targets for results which exceed expectations. The better alignment of the STI program with business results creates higher volatility in costs.
These measures, as calculated by Vishay, may not be comparable to similarly titled measures used by other companies. We closely monitor variable costs and seek to achieve the contributive margin in our business model. Over a period of many years, we have generally maintained a contributive margin of between 45% and 47% of revenues.
The classification of expenses as either variable or fixed is judgmental and other companies might classify such expenses differently. These measures, as calculated by Vishay, may not be comparable to similarly titled measures used by other companies. We closely monitor variable costs and seek to achieve the contributive margin in our business model.
The decrease was primarily due to decreased sales to distribution customers and customers in the industrial and automotive end markets. Sales decreased in the Europe and Americas regions, partially offset by an increase in sales in the Asia region. The gross profit margin decreased versus the prior year.
The increase is primarily due to increased sales to distribution customers, industrial and healthcare end market customers, and customers in the Asia region, partially offset by decreased sales to military and aerospace end market customers. Gross profit margin decreased versus the prior year. The decrease is primarily due to higher variable costs. Segment operating margin decreased versus the prior year.
Net revenues and margins decreased versus the prior year period primarily due to lower volume and decreased average selling prices. Net revenues for the year ended December 31, 2024 were $2.938 billion, compared to net revenues of $3.402 billion and $3.497 billion for the years ended December 31, 2023 and 2022, respectively.
Net revenues for the year ended December 31, 2025 were $3.069 billion, compared to net revenues of $2.938 billion and $3.402 billion for the years ended December 31, 2024 and 2023, respectively.
Beginning in early 2025, we expect to be in a better position to capture the next step in the growing demand for electrification in our key end-markets. To focus this growth, we have identified product lines for growth across each reportable segment. Most of these product lines serve multiple end-market segments, applications, and business channels.
To focus this growth, we have identified product lines for growth across each reportable segment. Most of these product lines serve multiple end-market segments, applications, and business channels.
Additionally, interest commitments for our revolving credit facility are based on the rate prevailing at December 31, 2024, but actual rates are variable and are certain to change over time. We will pay the final increment of the TCJA transition tax in 2025.
Additionally, interest commitments for our revolving credit facility are based on the rate prevailing at December 31, 2025, but actual rates are variable and are certain to change over time. Our consolidated balance sheet at December 31, 2025 includes liabilities associated with uncertain tax positions in multiple taxing jurisdictions where we conduct business.
Additionally, our convertible senior notes due 2025 and due 2030 have cross-default provisions that could accelerate repayment in the event the indebtedness under the credit facility is accelerated.
Additionally, our convertible senior notes due 2030 have cross-default provisions that could accelerate repayment in the event the indebtedness under the credit facility is accelerated. Borrowings under the credit facility bear interest at variable reference rates plus an interest margin. The applicable interest margin is based on our total leverage ratio.
Management uses this measure to determine the amount of profit to be expected for any change in revenues. While these measures are typical cost accounting measures, none of these measures are recognized in accordance with GAAP. The classification of expenses as either variable or fixed is judgmental and other companies might classify such expenses differently.
Contributive margin is calculated as net revenue less variable costs. It may be expressed in dollars or as a percentage of net revenue. Management uses this measure to determine the amount of profit to be expected for any change in revenues. While these measures are typical cost accounting measures, none of these measures are recognized in accordance with GAAP.
The long-term outlook for our business remains strong, although our results are weaker than prior year results.
The long-term outlook for our business remains strong.