Biggest changeFor additional information related to these and other accounting policies refer to Note 2 - Summary of Significant Accounting Policies to our Consolidated Financial Statements included in this Annual Report which is incorporated by reference herein. 29 RESULTS OF OPERATIONS The following table sets forth, for the periods indicated, our Statements of Operations data (in thousands): Fiscal Years 2022 2021 2020 Revenue $ 675,170 $ 606,920 $ 530,037 Cost of revenue (1) 268,989 265,065 259,871 Gross profit 406,181 341,855 270,166 Operating expenses: Research and development (1) 148,228 138,844 141,333 Selling, general and administrative (1) 125,279 122,009 124,306 Restructuring charges (2) — — 1,139 Total operating expenses 273,507 260,853 266,778 Income from operations 132,674 81,002 3,388 Other income (expense): Warrant liability expense (3) — (11,130) (12,948) Interest expense, net (4,300) (20,593) (27,380) Other income (expense), net (4) 114,746 (6,334) (4,622) Other income (expense), net 110,446 (38,057) (44,950) Income (loss) before income taxes 243,120 42,945 (41,562) Income tax (benefit) expense (5) (196,835) 4,972 4,516 Net income (loss) $ 439,955 $ 37,973 $ (46,078) (1) Includes (a) amortization expense related to intangible assets arising from acquisitions and (b) share-based compensation expense included in our Consolidated Statements of Operations as set forth below (in thousands): Fiscal Years 2022 2021 2020 (a) Intangible amortization expense: Cost of revenue $ 7,839 $ 15,296 $ 17,462 Selling, general and administrative 25,592 30,917 32,868 Total intangible amortization expense $ 33,431 $ 46,213 $ 50,330 (b) Share-based compensation expense: Cost of revenue $ 4,038 $ 3,298 $ 3,609 Research and development 14,940 13,332 12,794 Selling, general and administrative 22,207 18,368 19,271 Total share-based compensation expense $ 41,185 $ 34,998 $ 35,674 (2) See Note 11 - Restructurings , to the Consolidated Financial Statements included in this Annual Report for additional information.
Biggest changeRESULTS OF OPERATIONS The following table sets forth, for the periods indicated, our Statements of Operations data (in thousands): Fiscal Years 2023 2022 2021 Revenue $ 648,407 $ 675,170 $ 606,920 Cost of revenue (1) 262,610 268,989 265,065 Gross profit 385,797 406,181 341,855 Operating expenses: Research and development (1) 148,545 148,228 138,844 Selling, general and administrative (1) (2) 129,852 125,279 122,009 Total operating expenses 278,397 273,507 260,853 Income from operations 107,400 132,674 81,002 Other income (expense): Warrant liability expense (3) — — (11,130) Interest income 20,807 4,251 1,470 Interest expense (12,384) (8,551) (22,063) Other (expense) income, net (4) (665) 114,746 (6,334) Other income (expense), net 7,758 110,446 (38,057) Income before income taxes 115,158 243,120 42,945 Income tax expense (benefit) (5) 23,581 (196,835) 4,972 Net income $ 91,577 $ 439,955 $ 37,973 (1) Includes (a) amortization expense related to intangible assets arising from acquisitions and (b) share-based compensation expense included in our Consolidated Statements of Operations as set forth below (in thousands): 30 Fiscal Years 2023 2022 2021 (a) Intangible amortization expense: Cost of revenue $ 4,369 $ 7,839 $ 15,296 Selling, general and administrative 23,735 25,592 30,917 Total intangible amortization expense $ 28,104 $ 33,431 $ 46,213 (b) Share-based compensation expense: Cost of revenue $ 4,325 $ 4,038 $ 3,298 Research and development 14,808 14,940 13,332 Selling, general and administrative 18,970 22,207 18,368 Total share-based compensation expense $ 38,103 $ 41,185 $ 34,998 (2) Fiscal year 2023 includes $7.7 million of acquisition-related professional fees expense.
OVERVIEW We design and manufacture semiconductor products for Telecom, I&D and Data Center industries. Headquartered in Lowell, Massachusetts, we have more than 70 years of application expertise, with silicon, GaAs, GaN and InP fabrication, manufacturing, assembly and test, and operational facilities throughout North America, Europe and Asia.
OVERVIEW We design and manufacture semiconductor products for I&D, Data Center and Telecom industries. Headquartered in Lowell, Massachusetts, we have more than 70 years of application expertise, with silicon, GaAs, GaN and InP fabrication, manufacturing, assembly and test, and operational facilities throughout North America, Europe and Asia.
Our primary end markets are: (1) Telecom, which includes carrier infrastructure such as long-haul/metro, 5G and FTTx/PON, among others; (2) I&D, which includes military and commercial radar, RF jammers, electronic countermeasures, communication data links, satellite communications and multi-market applications, which include industrial, medical, test and measurement and scientific applications; and (3) Data Center, enabled by our broad portfolio of analog ICs and photonic components for high speed optical module customers.
Our primary end markets are: (1) I&D, which includes military and commercial radar, RF jammers, electronic countermeasures, communication data links, satellite communications and multi-market applications, which include industrial, medical, test and measurement and scientific applications; (2) Data Center, enabled by our broad portfolio of analog ICs and photonic components for high speed optical module customers; and (3) Telecom, which includes carrier infrastructure such as long-haul/metro, 5G and FTTx/PON, among others.
Our core strategy is to develop and innovate high-performance products that address our customers’ most difficult technical challenges in our primary markets: Telecom, I&D and Data Center.
Our core strategy is to develop and innovate high-performance products that address our customers’ most difficult technical challenges in our primary markets: I&D, Data Center and Telecom.
Our actual product usage may vary from the historical experience and estimating 28 demand is inherently difficult, particularly given the cyclical nature of the semiconductor industry, both of these factors may result in us recording excess and obsolete inventory amounts that do not match the required amounts.
Our actual product usage may vary from the historical experience and estimating demand is inherently difficult, particularly given the cyclical nature of the semiconductor industry, both of these factors may result in us recording excess and obsolete inventory amounts that do not match the required amounts.
Research and development expense increased during fiscal year 2022 primarily as a result of an increase in employee headcount, employee-related costs, share-based compensation expense, depreciation expense, development foundry costs and design software costs, partially offset by lower lease costs. 31 Selling, general and administrative.
Research and development expense increased during fiscal year 2022 primarily as a result of an increase in employee headcount, employee-related costs, share-based compensation expense, depreciation expense, development foundry costs and design software costs, partially offset by lower lease costs. Selling, general and administrative.
(4) Fiscal year 2022 includes a gain on sale of our equity method investment of $118.2 million. Includes non-cash net losses of $3.3 million, $2.4 million and $3.4 million for fiscal years 2022, 2021 and 2020, respectively, associated with our equity method investment based on our proportionate share of its losses and changes in equity.
(4) Fiscal year 2022 includes a gain on sale of our equity method investment of $118.2 million. Includes non-cash net losses of $3.3 million and $2.4 million for fiscal years 2022 and 2021, respectively, associated with our equity method investment based on our proportionate share of its losses and changes in equity.
Cash Flow from Investing Activities: Our cash flow used in investing activities for fiscal year 2022 of $182.9 million consisted primarily of $528.8 million in purchases of short-term investments and capital expenditures of $26.5 million, partially offset by proceeds from the sale of our equity method investment of $127.8 million and proceeds of $244.6 million related to the sale and maturities of short-term investments.
Our cash flow used in in vesting activities for fiscal year 2022 of $182.9 million consisted primarily of $528.8 million in purchases of short-term investments and capital expenditures of $26.5 million, partially offset by proceeds from the sale of our equity method investment of $127.8 million and proceeds of $244.6 million related to the sale and maturities of short-term investments.
Our semiconductor products are electronic components that our customers generally incorporate into larger electronic systems, such as wireless basestations, high-capacity optical networks, radar, medical systems and test and measurement applications.
Our semiconductor products are electronic components that our customers generally incorporate into larger electronic systems, such as wireless basestations, high-capacity optical networks, data center networks, radar, medical systems and test and measurement applications.
In fiscal year 2022, our revenue increased by $68.3 million, or 11.2%, to $675.2 million from $606.9 million for fiscal year 2021. Fiscal year 2022 and fiscal year 2021 consisted of 52 weeks.
In fiscal year 2022, our revenue increased by $68.3 million, or 11.2%, to $675.2 million from $606.9 million for fiscal year 2021. Fiscal years 2022 and 2021 each consisted of 52 weeks.
For additional information on the sale of our equity method investment, see Note 4 - Investments to our Consolidated Financial Statements included in this Annual Report.
For additional information on the sale of our equity method investment, see Note 5 - Investments to our Consolidated Financial Statements included in this Annual Report.
Cash Flow from Financing Activities: During fiscal y ear 2022, our cash used in financing activities of $28.9 million was primarily related to $36.0 million of repurchases of stock associated with employee tax withholdings on vested equity awards, partially offset by $8.1 million of proceeds from stock option exercises and employee stock purchases.
During fiscal year 2022, our cash used in financing activities of $28.9 million was primarily related to $36.0 million of repurchases of stock associated with employee tax withholdings on vested equity awards, partially offset by $8.1 million of proceeds from stock option exercises and employee stock purchases.
See Note 15 - Debt to the Consolidated Financial Statements included in this Annual Report for additional information. (5) Fiscal year 2022 includes a non-cash benefit of $202.8 million related to the partial release of our valuation allowance.
See Note 15 - Debt to the Consolidated Financial Statements included in this Annual Report for additional information. (5) Fiscal year 2023 and 2022 includes a non-cash benefit of $12.1 million and $202.8 million, respectively, related to the partial release of our valuation allowance.
Actual results could differ from those estimates and material effects on our operating results and financial position may result. The accounting policies which our management believes involve the most significant application of judgment or involve complex estimation, are inventories and associated reserves; revenue reserves; share-based compensation valuations and income taxes.
Actual results could differ from those estimates and material effects on our operating results and financial position may result. The accounting policies which our management believes involve the most significant application of judgment or involve complex estimation, are inventories and associated reserves; revenue reserves; business combinations; goodwill and intangible asset valuation; share-based compensation valuations and income taxes.
The difference between the U.S. federal income tax rate of 21% and our effective income tax rate of 11.6% for fiscal year 2021 was primarily driven by the continuation of a full valuation allowance against any tax expense associated with U.S. income and income taxed in foreign jurisdictions at generally lower tax rates.
For fiscal year 2021, our effective income tax rate of 11.6% was primarily impacted by the continuation of a full valuation allowance against any tax expense associated with U.S. income and income taxed in foreign jurisdictions at generally lower tax rates.
See “ Item 1 - Business ” for additional information. 27 Basis of Presentation We have one reportable operating segment and all intercompany balances have been eliminated in consolidation. We have a 52 or 53-week fiscal year ending on the Friday closest to the last day of September.
See “ Item 1 - Business ” for additional information. Basis of Presentation We have one reportable operating segment and all intercompany balances have been eliminated in consolidation. We have a 52 or 53-week fiscal year ending on the Friday closest to the last day of September. Fiscal years 2023, 2022 and 2021 each consisted of 52 weeks.
Liquidity As of September 30, 2022, we held $120.0 million of cash and cash equivalents, primarily deposited with financial institutions as well as $466.6 million of liquid short-term investments. The undistributed earnings of certain foreign subsidiaries are considered indefinitely reinvested for the periods presented and we do not intend to repatriate such earnings.
Liquidity As of September 29, 2023, we held $174.0 million of cash and cash equivalents, primarily deposited with financial institutions as well as $340.6 million of liquid short-term investments. The undistributed earnings of certain foreign subsidiaries are considered indefinitely reinvested for the periods presented and we do not intend to repatriate such earnings.
As of September 30, 2022, cash held by our indefinitely reinvested foreign subsidiaries was $15.2 million, which, along with cash generated from foreign operations, is expected to be used in the support of international growth and working capital requirements as well as the repayment of certain intercompany loans.
As of September 29, 2023, cash held by our indefinitely reinvested foreign subsidiaries was $16.5 million, which, along with cash generated from foreign operations, is expected to be used in the support of international growth and working capital requirements as well as the repayment of certain intercompany loans.
The increase in fiscal year 2022 is primarily due to the gain on sale of our equity method investment of $118.2 million. See Note 4 - Investments to our Consolidated Financial Statements included in this Annual Report for more information. Provision f or income tax (benefit) expense .
The increase in fiscal year 2022 is primarily due to the gain on sale of our equity method investment of $118.2 million. See Note 5 - Investments to our Consolidated Financial Statements included in this Annual Report for more information. 33 Provision for income taxes .
We may need to raise additional capital from time to time through the issuance and sale of equity or debt securities, and there is no assurance that we will be able do so on favorable terms or at all.
We may need to raise additional capital from time to time through the issuance and sale of equity or debt securities, and there is no assurance that we will be able do so on favorable terms or at all. As of September 29, 2023, we had no off-balance sheet arrangements.
See Note 20 - Income Taxes to the Consolidated Financial Statements included in this Annual Report for additional information. 30 The following table sets forth, for the periods indicated, our Statements of Operations data expressed as a percentage of our revenue: Fiscal Years 2022 2021 2020 Revenue 100.0 % 100.0 % 100.0 % Cost of revenue 39.8 43.7 49.0 Gross profit 60.2 56.3 51.0 Operating expenses: Research and development 22.0 22.9 26.7 Selling, general and administrative 18.6 20.1 23.5 Restructuring charges — — 0.2 Total operating expenses 40.5 43.0 50.3 Income from operations 19.7 13.3 0.6 Other income (expense): Warrant liability expense — (1.8) (2.4) Interest expense, net (0.6) (3.4) (5.2) Other income (expense), net 17.0 (1.0) (0.9) Total other income (expense), net 16.4 (6.3) (8.5) Income (loss) before income taxes 36.0 7.1 (7.8) Income tax (benefit) expense (29.2) 0.8 0.9 Net income (loss) 65.2 % 6.3 % (8.7) % Comparison of Fiscal Year Ended September 30, 2022 to Fiscal Year Ended October 1, 2021 Revenue.
The following table sets forth, for the periods indicated, our Statements of Operations data expressed as a percentage of our revenue: Fiscal Years 2023 2022 2021 Revenue 100.0 % 100.0 % 100.0 % Cost of revenue 40.5 39.8 43.7 Gross profit 59.5 60.2 56.3 Operating expenses: Research and development 22.9 22.0 22.9 Selling, general and administrative 20.0 18.6 20.1 Total operating expenses 42.9 40.5 43.0 Income from operations 16.6 19.7 13.3 Other income (expense): Warrant liability expense — — (1.8) Interest income 3.2 0.6 0.2 Interest expense (1.9) (1.2) (3.6) Other (expense) income, net (0.1) 17.0 (1.0) Total other income (expense), net 1.2 16.4 (6.3) Income before income taxes 17.8 36.0 7.1 Income tax expense (benefit) 3.7 (29.2) 0.8 Net income 14.1 % 65.2 % 6.3 % Comparison of Fiscal Year Ended September 29, 2023 to Fiscal Year Ended September 30, 2022 Revenue.
The net loss amounts for fiscal years 2021 and 2020 include non-cash gains of $9.8 million and $16.6 million, respectively, associated with changes in the investment’s equity. See Note 4 - Investments to the Consolidated Financial Statements included in this Annual Report for additional information. Fiscal year 2021 also includes losses on extinguishment of debt of $4.4 million.
The net loss amount for fiscal year 2021 includes a non-cash gain of $9.8 million associated with changes in the investment’s equity. See Note 5 - Investments to the Consolidated Financial Statements included in this Annual Report for additional information. Fiscal year 2021 also includes losses on extinguishment of debt of $4.4 million.
In addition, cash used by operating assets and liabilities was $46.7 million for fiscal year 2022, primarily driven by an increase in accounts receivable of $17.0 million, an increase in inventory of $32.3 million, a decrease in accrued and other liabilities of $5.6 million, partially offset by a decrease in prepaid expenses and other assets of $5.6 million and an increase in accounts payable of $2.4 million. 33 Our cash flow from operating activities for fiscal year 2021 was $148.4 million and consisted of a net income of $38.0 million, plus adjustments to reconcile our net income to cash provided by operating activities of $136.4 million, partially offset by changes in operating assets and liabilities of $25.9 million.
In addition, cash used by operating assets and liabilities was $46.7 million for fiscal year 2022, primarily driven by an increase in accounts receivable of $17.0 million, an increase in inventory of $32.3 million, a decrease in accrued and other liabilities of $5.6 million, partially offset by a decrease in prepaid expenses and other assets of $5.6 million and an increase in accounts payable of $2.4 million.
We expect our revenue in the Telecom market to be driven by 5G deployments, with continued upgrades and expansion of communications equipment, and increasing adoption of our high-performance RF, millimeter wave, optical and photonic components.
We expect our revenue in the Telecom market to be driven by 5G deployments, with continued upgrades and expansion of communications equipment, and increasing adoption of our high-performance RF, millimeter wave, optical and photonic components. 28 CRITICAL ACCOUNTING POLICIES AND ESTIMATES Our discussion and analysis of our financial condition and results of operations are based on our Consolidated Financial Statements.
LIQUIDITY AND CAPITAL RESOURCES The following table summarizes our cash flow activities for the fiscal years ended September 30, 2022 and October 1, 2021, respectively (in thousands): Fiscal Year Ended September 30, 2022 October 1, 2021 Cash and cash equivalents, beginning of period $ 156,537 $ 129,441 Net cash provided by operating activities 176,982 148,412 Net cash used in investing activities (182,861) (2,583) Net cash used in financing activities (28,908) (119,095) Effect of exchange rates on cash balances (1,798) 362 Cash and cash equivalents, end of period $ 119,952 $ 156,537 Cash Flow from Operating Activities: Our cash flow from operating activities for fiscal year 2022 was $177.0 million and consisted of a net income of $440.0 million, plus adjustments to reconcile our net income to cash provided by operating activities of $216.3 million, and changes in operating assets and liabilities of $46.7 million.
LIQUIDITY AND CAPITAL RESOURCES The following table summarizes our cash flow activities for the fiscal years ended September 29, 2023 and September 30, 2022, respectively (in thousands): Fiscal Year Ended September 29, 2023 September 30, 2022 Cash and cash equivalents, beginning of period $ 119,952 $ 156,537 Net cash provided by operating activities 166,917 176,982 Net cash used in investing activities 36,341 (182,861) Net cash used in financing activities (149,020) (28,908) Effect of exchange rates on cash balances (238) (1,798) Cash and cash equivalents, end of period $ 173,952 $ 119,952 Cash Flow from Operating Activities: Our cash flow from operating activities for fiscal year 2023 was $166.9 million and consisted of a net income of $91.6 million, plus adjustments to reconcile our net income to cash provided by operating activities of $103.1 million, and cash used by operating assets and liabilities of $27.8 million.
Description of Our Revenue Revenue. Our revenue is derived from sales of high-performance RF, microwave, millimeter wave, optical and photonic semiconductor products. We design, integrate, manufacture and package differentiated, semiconductor-based products that we sell to customers through our direct sales organization, our network of independent sales representatives and our distributors.
We design, integrate, manufacture and package differentiated, semiconductor-based products that we sell to customers through our direct sales organization, our network of independent sales representatives and our distributors.
The application of tax laws and regulations to calculate our tax liabilities is subject to legal and factual interpretation, judgment, and uncertainty in a multitude of jurisdictions. Tax laws and regulations themselves are subject to change as a result of changes in fiscal policy, changes in legislation, the evolution of regulations, and court rulings.
Tax laws and regulations themselves are subject to change as a result of changes in fiscal policy, changes in legislation, the evolution of regulations, and court rulings.
Significant judgment is required in making these assessments to maintain or reverse the majority of our valuation allowances and, to the extent our future expectations change we would have to assess the recoverability of these deferred tax assets at that time. This resulted in a tax benefit of $202.8 million, or $2.91 per basic share in fiscal year 2022.
Significant judgment is required in making these assessments to maintain or reverse the majority of our valuation allowances. To the extent our future expectations change, we would have to reassess the recoverability of our deferred tax assets at that time.
Although it is reasonably possible that our estimates could change materially in the next twelve months, we are presently unable to reliably estimate when any cash settlement of these obligations may occur.
As of September 29, 2023, we estimated $1.9 million in asset retirement obligations primarily for the restoration of leased facilities upon the termination of the related leases. Although it is reasonably possible that our estimates could change materially in the next twelve months, we are presently unable to reliably estimate when any cash settlement of these obligations may occur.
In addition, cash used by operating assets and liabilities was $25.9 million for fiscal year 2021, primarily driven by an increase in accounts receivable of $38.7 million due to timing of sales, partially offset by a decrease in inventory of $8.9 million and an increase in accounts payable of $5.8 million.
In addition, cash used by operating assets and liabilities was $27.8 million for fiscal year 2023, primarily driven by a decrease in accrued and other liabilities of $21.3 million, an increase in inventory of $10.6 million, a decrease in accounts payable of $6.7 million, partially offset by a decrease in accounts receivable of $12.3 million.
We design, develop and manufacture differentiated semiconductor products for customers who demand high performance, quality and reliability. We offer a broad portfolio of thousands of standard and custom devices, which include ICs, MCMs, diodes, amplifiers, switches and switch limiters, passive and active components and complete subsystems, across dozens of product lines serving over 6,000 end customers in three primary markets.
We offer a broad portfolio of thousands of standard and custom devices, which include ICs, MCMs, diodes, amplifiers, switches and switch limiters, passive and active components and RF and optical subsystems, which make up dozens of product lines that service over 6,000 end customers in our three primary markets.
Our cash flow used in investing activities for fiscal year 2021 consisted primarily of $194.2 million in purchases of short-term investments and capital expenditures of $18.0 million, partially offset by proceeds of $209.3 million related to the sale and maturities of short-term investments.
Cash Flow from Investing Activities: Our cash flow from investing activities for fiscal year 2023 of $36.3 million consisted primarily of proceeds of $515.8 million related to the sale and maturities of short-term investments and proceeds from the sale of equipment of $8.0 million, partially offset by $375.1 million in purchases of short-term investments, $87.7 million for acquisitions, net of cash acquired and capital expenditures of $24.7 million.
In fiscal year 2021, research and development expense decreased by $2.5 million, or 1.8%, to $138.8 million representing 22.9% of revenue, compared with $141.3 million, representing 26.7% of revenue in fiscal year 2020.
In fiscal year 2023, research and development expense increased by $0.3 million, or 0.2%, to $148.5 million, representing 22.9% of revenue, compared with $148.2 million, representing 22.0% of revenue, in fiscal year 2022.
These differences result in deferred tax assets and liabilities, which are included within our Consolidated Balance Sheets. We then assess the likelihood that our deferred tax assets will be recovered from future taxable income within the relevant jurisdiction and to the extent we believe that recovery is not likely, we must establish a valuation allowance.
We then assess the likelihood that our deferred tax assets will be recovered from future taxable income within the relevant jurisdiction. To the extent we believe that recovery is not likely, we must establish a valuation allowance. We provide valuation allowances for certain deferred tax assets where it is more likely than not that any portion will not be realized.
During fiscal year 2021, our cash used in financing activities of $119.1 million was primarily related to $545.3 million of prepayments on our Term Loans (as defined in Note 15 - Debt to our Consolidated Financial Statements included in this Annual Report) and $23.4 million of repurchases of stock associated with employee tax withholdings on vested equity awards, partially offset by proceeds of $450.0 million from the 2026 Convertible Notes (as defined in Note 15 - Debt to our Consolidated Financial Statements included in this Annual Report) and $6.8 million of proceeds from stock option exercises and employee stock purchases.
Cash Flow from Financing Activities: 34 During fiscal year 2023, our cash used in financing activities of $149.0 million was primarily related to the $120.8 million payment of the total outstanding principal balance of our Term Loans (as defined in Note 15 - Debt ), $32.6 million of repurchases of stock associated with employee tax withholdings on vested equity awards, partially offset by $5.6 million of proceeds from employee stock purchases.
Income taxes We are required to estimate our income taxes in each of the jurisdictions in which we operate. This process involves estimating our actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting purposes.
This process involves estimating our current tax exposure together and assessing temporary differences resulting from differing treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within our Consolidated Balance Sheets.
In the fiscal fourth quarter of 2022, we reassessed our valuation allowances and considered positive evidence including significant cumulative consolidated and U.S. income over the three years ended September 30, 2022, continued revenue growth combined with profitability and expectations regarding financial forecasts, and negative evidence, including the uncertainty posed by the current economic and geopolitical environment and global supply chain and determined that the valuation allowance on the majority of our domestic NOLs and R&D tax credit carryforwards and other deferred tax assets should be released as of September 30, 2022.
In making this determination, we considered positive evidence, including significant cumulative consolidated and U.S. income over the three years ended September 30, 2022, continued revenue growth combined with profitability and expectations regarding financial forecasts. We also considered negative evidence, including the uncertainty relating to the economic and geopolitical environment and global supply chain.
The actual pricing adjustments granted to distributors may significantly exceed or be less than the historical estimates resulting in adjustments to revenue in the incorrect period. Share-based compensation expense We account for share-based compensation arrangements using the fair value method as described in Note 2 - Summary of Significant Accounting Policies to our Consolidated Financial Statements in this Annual Report.
Share-based compensation expense We account for share-based compensation arrangements using the fair value method as described in Note 2 - Summary of Significant Accounting Policies to our Consolidated Financial Statements in this Annual Report. There are a significant number of estimates and assumptions required for the initial valuation as well as for the ongoing valuation of certain share-based compensation items.
In fiscal year 2021, selling, general and administrative expenses decreased by $2.3 million, or 1.8%, to $122.0 million, or 20.1% of revenue, compared with $124.3 million, or 23.5% of revenue, for fiscal year 2020.
In fiscal year 2023, selling, general and administrative expenses increased by $4.6 million, or 3.7%, to $129.9 million, or 20.0% of revenue, compared with $125.3 million, or 18.6% of revenue, for fiscal year 2022.
In fiscal year 2021, our gross profit increased by $71.7 million, or 26.5%, compared to fiscal year 2020. Gross margin of 56.3% in fiscal year 2021 increased 530 basis points, compared to fiscal year 2020.
Gross profit. In fiscal year 2023, our gross profit decreased by $20.4 million, or 5.0%, compared to fiscal year 2022. Gross margin of 59.5% in fiscal year 2023 decreased 70 basis points, compared to fiscal year 2022.
The increase was primarily related to new program wins and expansion of our RF and microwave product lines. In fiscal year 2021, our Data Center market revenue increased by $12.3 million, or 9.8%, compared to fiscal year 2020. The increase was primarily due to increased sales of our high-performance analog and optoelectronics Data Center products. Gross profit .
The increase was primarily driven by defense program shipments, incremental revenue from recent acquisitions, sales of GaN products and expansion of high-performance analog product lines into the I&D market, partially offset by a decrease in sales of legacy products. In fiscal year 2023, our Data Center market revenue increased by $8.9 million, or 6.4%, compared to fiscal year 2022.
Fiscal years 2022 and 2021 each consisted of 52 weeks, and fiscal year 2020 included 53 weeks. To offset the effect of holidays, for fiscal years in which there are 53 weeks, we typically include the extra week in the first quarter of our fiscal year. Our first quarter of fiscal year 2020, ended January 3, 2020, included 14 weeks.
To offset the effect of holidays, for fiscal years in which there are 53 weeks, we typically include the extra week in the first quarter of our fiscal year. Description of Our Revenue Revenue. Our revenue is derived from sales of high-performance RF, microwave, millimeter wave, optical and photonic semiconductor products.
The early prepayment on the Term Loans of $543.6 million was made using $443.6 million of net proceeds from our 2026 Convertible Notes and cash of $100.0 million. See Note 15 - Debt to our Consolidated Financial Statements included in this Annual Report for additional information.
For additional information on the payment of the total outstanding principal balance of our Term Loans, see Note 15 - Debt to our Consolidated Financial Statements included in this Annual Report.
Adjustments to reconcile our net income to cash provided by operating activities of $136.4 million primarily included depreciation and intangible amortization expense of $70.0 million, share-based compensation expense of $35.0 million, warrant liability expense of $11.1 million, accretion of the discount on convertible debt of $7.6 million and deferred financing cost amortization and write offs of $6.5 million.
Adjustments to reconcile our net income to cash provided by operating activities of $103.1 million primarily included depreciation and intangible amortization expense of $52.2 million, share-based compensation expense of $38.1 million and deferred income tax expense of $19.8 million, partially offset by $11.8 million in amortization on marketable securities.
There are a significant number of estimates and assumptions required for the initial valuation as well as for the ongoing valuation of certain share-based compensation items. These estimates may vary significantly and the assumptions may not be accurate resulting us to make adjustments to historically recorded balances.
These estimates may vary significantly and the assumptions may not be accurate resulting us to make adjustments to historically recorded balances. Income taxes 29 We are required to estimate our income taxes in each of the jurisdictions in which we operate.
Research and development expense decreased during fiscal year 2021 primarily as a result of decreased spending on software and lower depreciation, partially offset by higher suppliers expense, foundry costs and outside service costs. Selling, general and administrative.
Research and development expense increased during fiscal year 2023 primarily as a result of an increase in employee headcount primarily due to acquisitions, employee-related costs and development foundry costs, offset by decreases in design software costs, supplies expense and lower variable compensation. Selling, general and administrative.
As of September 30, 2022, we had no off-balance sheet arrangements. 34 The following is a summary of our significant contractual payment obligations for consolidated debt, purchase agreements, leases, financing obligations, other commitments and long-term liabilities as of September 30, 2022, and the effect such obligations are expected to have on our liquidity and cash flows in future periods (in thousands): Payments Due By Period Contractual Cash Obligations Total Less Than 1 Year 1-3 Years 3-5 Years More Than 5 Years Principal Payments on Long-term Debt (1) $ 570,766 $ — $ 120,766 $ 450,000 $ — Interest Payments on Long-term Debt (1) 13,363 6,970 5,824 569 — Finance Lease Obligations (2) 45,611 2,820 5,639 5,398 31,754 Operating Lease Obligations (2) 35,756 7,969 12,587 7,741 7,459 Purchase Commitments (3) 141,108 109,825 9,080 3,432 18,771 Total Contractual Cash Obligations $ 806,604 $ 127,584 $ 153,896 $ 467,140 $ 57,984 ________________________________________________________________________________________________________ (1) Our Term Loans will mature in May 2024 and our 2026 Convertible Notes will mature in March 2026.
The following is a summary of our significant contractual payment obligations for consolidated debt, purchase agreements, leases, financing obligations, other commitments and long-term liabilities as of September 29, 2023, and the effect such obligations are expected to have on our liquidity and cash flows in future periods (in thousands): Payments Due By Period Contractual Cash Obligations Total Less Than 1 Year 1-3 Years 3-5 Years More Than 5 Years Principal Payments on Long-term Debt (1) $ 450,000 $ — $ 450,000 $ — $ — Interest Payments on Long-term Debt (1) 2,813 1,125 1,688 — — Finance Lease Obligations (2) 61,121 3,322 5,463 5,472 46,864 Operating Lease Obligations (2) 34,725 8,727 12,053 8,898 5,047 Purchase Commitments (3) 103,462 72,516 10,447 3,481 17,018 Total Contractual Cash Obligations $ 652,121 $ 85,690 $ 479,651 $ 17,851 $ 68,929 ________________________________________________________________________________________________________ (1) Our 2026 Convertible Notes will mature in March 2026.
Revenue from our primary markets, the percentage of change between the years and revenue by primary markets expressed as a percentage of total revenue were (in thousands, except percentages): Fiscal Years 2021 2020 % Change Telecom $ 188,391 $ 209,477 (10.1) % Industrial & Defense 280,221 194,506 44.1 % Data Center 138,308 126,054 9.8 % Total $ 606,920 $ 530,037 14.5 % Telecom 31.0 % 39.5 % Industrial & Defense 46.2 % 36.7 % Data Center 22.8 % 23.8 % Total 100.0 % 100.0 % In fiscal year 2021, our Telecom market revenue decreased by $21.1 million, or 10.1%, compared to fiscal year 2020.
Fiscal years 2023 and 2022 each consisted of 52 weeks. 31 Revenue from our primary markets, the percentage of change between the years and revenue by primary markets expressed as a percentage of total revenue were (in thousands, except percentages): Fiscal Years 2023 2022 % Change Industrial & Defense $ 317,128 $ 294,341 7.7 % Data Center 146,982 138,127 6.4 % Telecom 184,297 242,702 (24.1) % Total $ 648,407 $ 675,170 (4.0) % Industrial & Defense 48.9 % 43.6 % Data Center 22.7 % 20.5 % Telecom 28.4 % 35.9 % Total 100.0 % 100.0 % In fiscal year 2023, our I&D market revenue increased by $22.8 million, or 7.7%, compared to fiscal year 2022.
We provide valuation allowances for certain of our deferred tax assets, where it is more likely than not that some portion, or all of such assets, will not be realized. On a periodic basis, we reassess our valuation allowances on our deferred tax assets, weighing positive and negative evidence to assess the recoverability of the deferred tax assets.
On a periodic basis, we reassess valuation allowances on our deferred tax assets, weighing positive and negative evidence, to assess recoverability. We determined that the valuation allowance on the majority of our domestic NOLs and R&D tax credit carryforwards and other deferred tax assets should be released as of September 30, 2022.
In fiscal year 2021, income tax expense was $5.0 million, or 0.8% of revenue, compared to an expense of $4.5 million, or 0.9% of revenue, for fiscal year 2020. The change in the provision is primarily due to a change in the valuation allowance.
In fiscal year 2023, interest income was $20.8 million, or 3.2% of our revenue, compared to $4.3 million of interest income, or 0.6% of our revenue, for fiscal year 2022. The change in fiscal year 2023 is due to higher yields on short-term investments and cash equivalents. Interest expense.
For fiscal year 2021, our effective income tax rate of 11.6% was primarily impacted by the continuation of a full valuation allowance against any tax expense associated with U.S. income and income taxed in foreign jurisdictions at generally lower tax rates. Comparison of Fiscal Year Ended October 1, 2021 to Fiscal Year Ended October 2, 2020 Revenue .
For fiscal year 2022, our effective income tax rate of (81.0)% was primarily driven by tax benefits arising from the partial release of the valuation allowance on U.S. deferred tax assets. Comparison of Fiscal Year Ended September 30, 2022 to Fiscal Year Ended October 1, 2021 Revenue .
The interest rate on the Term Loans is variable, which may result in changes to our interest obligations. See Note 15 - Deb t to the Consolidated Financial Statements included in this Annual Report for additional information. (2) Estimated future lease payments, see Note 17 - Leases to the Consolidated Financial Statements included in this Annual Report for additional information.
(2) Estimated future lease payments, see Note 17 - Leases to the Consolidated Financial Statements included in this Annual Report for additional information. (3) We have purchase commitments of $69.6 million primarily related to services and inventory supply arrangements of which approximately $56.9 million that is non-cancelable.
See Note 18 - Stockholders' Equity in this Annual Report for additional information regarding the common stock warrants. Interest expense, net. In fiscal year 2021, interest expense, net was $20.6 million, or 3.4% of our revenue, compared to $27.4 million, or 5.2% of our revenue, for fiscal year 2020.
In fiscal year 2023, interest expense was $12.4 million, or 1.9% of our revenue, compared to $8.6 million of interest expense, or 1.3% of our revenue, for fiscal year 2022.
The decrease was primarily driven by a decrease in carrier-based optical semiconductor products, including those targeted for 5G applications, offset by increased sales of legacy products, including products targeting fiber to the home, CATV infrastructure and licensing revenue. In fiscal year 2021, our I&D market revenue increased by $85.7 million, or 44.1%, compared to fiscal year 2020.
The decrease was primarily driven by a decrease in sales of products targeted for 5G applications, a decrease in sales of carrier-based optical semiconductor products, a decrease in sales of RF and microwave products for broadband access and video infrastructure and a decrease in sales of legacy backhaul products, primarily in China, partially offset by higher sales to satellite communications customers and higher sales of legacy high-performance analog Telecom products.