Biggest changeOur investments in growth in these areas may affect our short-term profitability. 51 Results of Operations A summary of our consolidated statements of operations for the years ended December 31, 2024 and 2023 are as follows (dollars in thousands): Years Ended December 31, 2024 2023 Increase (Decrease) Amount Percent of Total Revenue Amount Percent of Total Revenue Amount Percent Revenue: Products $ 139,799 53.4 % $ 141,082 56.1 % $ (1,283) (0.9) % Services 121,897 46.6 110,618 43.9 11,279 10.2 % Total revenue 261,696 100.0 251,700 100.0 9,996 4.0 % Cost of revenue: Products 31,218 11.9 31,468 12.5 (250) (0.8) % Services 20,201 7.7 16,494 6.6 3,707 22.5 % Total cost of revenue 51,419 19.6 47,962 19.1 3,457 7.2 % Gross profit 210,277 80.4 203,738 80.9 6,539 3.2 % Operating expenses: Sales and marketing 83,300 31.8 85,976 34.2 (2,676) (3.1) % Research and development 57,726 22.1 55,229 21.9 2,497 4.5 % General and administrative 25,283 9.7 23,885 9.5 1,398 5.9 % Total operating expenses 166,309 63.6 165,090 65.6 1,219 0.7 % Income from operations 43,968 16.8 38,648 15.4 5,320 13.8 % Non-operating income (expense): Interest income 6,747 2.6 5,078 2.0 1,669 32.9 % Interest and other income (expense), net 7,384 2.8 69 — 7,315 10,601.4 % Total non-operating income (expense), net 14,131 5.4 5,147 2.0 8,984 174.5 % Income before income taxes 58,099 22.2 43,795 17.4 14,304 32.7 % Provision for income taxes 7,959 3.0 3,825 1.5 4,134 108.1 % Net income $ 50,140 19.2 % $ 39,970 15.9 % $ 10,170 25.4 % Revenue We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software license and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes post contract support (“PCS”), professional services, training and software-as-a-service offerings.
Biggest changeSpending patterns remain uneven due to the unpredictable impact of trade policies, and we may need to implement tariff-related input cost increases. 50 Results of Operations A summary of our consolidated statements of operations for the years ended December 31, 2025 and 2024 are as follows (dollars in thousands): Years Ended December 31, 2025 2024 Increase (Decrease) Amount Percent of Total Revenue Amount Percent of Total Revenue Amount Percent Revenue: Products $ 167,086 57.5 % $ 139,799 53.4 % $ 27,287 19.5 % Services 123,471 42.5 121,897 46.6 1,574 1.3 % Total revenue 290,557 100.0 261,696 100.0 28,861 11.0 % Cost of revenue: Products 33,403 11.5 31,218 11.9 2,185 7.0 % Services 26,639 9.2 20,201 7.7 6,438 31.9 % Total cost of revenue 60,042 20.7 51,419 19.6 8,623 16.8 % Gross profit 230,515 79.3 210,277 80.4 20,238 9.6 % Operating expenses: Sales and marketing 84,467 29.1 83,300 31.8 1,167 1.4 % Research and development 69,104 23.8 57,726 22.1 11,378 19.7 % General and administrative 29,802 10.3 25,283 9.7 4,519 17.9 % Total operating expenses 183,373 63.1 166,309 63.6 17,064 10.3 % Income from operations 47,142 16.2 43,968 16.8 3,174 7.2 % Non-operating income (expense): Interest income 11,628 4.0 6,747 2.6 4,881 72.3 % Interest and other income (expense), net (6,348) (2.2) 7,384 2.8 (13,732) (186.0) % Total non-operating income (expense), net 5,280 1.8 14,131 5.4 (8,851) (62.6) % Income before income taxes 52,422 18.0 58,099 22.2 (5,677) (9.8) % Provision for income taxes 10,285 3.5 7,959 3.0 2,326 29.2 % Net income $ 42,137 14.5 % $ 50,140 19.2 % $ (8,003) (16.0) % Revenue We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software license and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes PCS, professional services, training and software-as-a-service offerings.
Cash Flows from Financing Activities During the year ended December 31, 2024, cash used in financing activities was $44.3 million consisting primarily of $30.1 million of cash used to repurchase our common stock in the open market, from privately negotiated transactions and from withholding shares in connection with vesting equity awards held by certain employees.
During the year ended December 31, 2024, cash used in financing activities was $44.3 million consisting primarily of $30.1 million of cash used to repurchase our common stock in the open market, from privately negotiated transactions and from withholding shares in connection with vesting equity awards held by certain employees.
The favorable change in deferred revenues was attributable to the timing of service contract bookings. The favorable change in accrued liabilities was due to increases in accrued income taxes and variable compensation. The favorable change in accounts payable is due to the timing of payments to our vendors.
The favorable change in deferred revenues was attributable to the timing of service contract bookings. The favorable change in accrued liabilities was due to increases in 56 accrued income taxes and variable compensation. The favorable change in accounts payable is due to the timing of payments to our vendors.
For 2025, we expect research and development expenses to increase from 2024 levels reflecting strategic investments in our growth priorities, including cybersecurity technology and AI technologies. General and Administrative General and administrative expenses primarily consist of personnel costs, professional services and office expenses. General and administrative personnel costs include executive, finance, human resources, information technology, facility and legal related expenses.
For 2026, we expect research and development expenses to increase from 2025 levels reflecting strategic investments in our growth priorities, including cybersecurity technology and AI technologies. General and Administrative General and administrative expenses primarily consist of personnel costs, professional services and office expenses. General and administrative personnel costs include executive, finance, human resources, information technology, facility and legal related expenses.
For 2025, we expect sales and marketing expenses to increase modestly from 2024 levels as we continue to apply a disciplined approach to focus our investments in areas that offer the greatest opportunities. Research and Development Research and development efforts are focused on new product development and on developing additional functionality for our existing products.
For 2026, we expect sales and marketing expenses to increase modestly from 2025 levels as we continue to apply a disciplined approach to focus our investments in areas that offer the greatest opportunities. Research and Development Research and development efforts are focused on new product development and on developing additional functionality for our existing products.
We generally use a range of amounts to estimate SSP for individual products and services based on multiple factors including, but not limited to the sales channel (reseller, distributor or end-customer), the geographies in which our products and services are sold, and the size of the end-customer. 59
We generally use a range of amounts to estimate SSP for individual products and services based on multiple factors including, but not limited to the sales channel (reseller, distributor or end-customer), the geographies in which our products and services are sold, and the size of the end-customer. 58
As a percentage of revenue, our 52 products revenue may vary from quarter to quarter based on, among other things, the timing of orders and delivery of products, cyclicality and seasonality, changes in currency exchange rates and the impact of significant transactions with unique terms and conditions.
As a percentage of revenue, our 51 products revenue may vary from quarter to quarter based on, among other things, the timing of orders and delivery of products, cyclicality and seasonality, changes in currency exchange rates and the impact of significant transactions with unique terms and conditions.
In addition, as described in Note 7 Commitments and Contingencies , in the notes to consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K, we may be currently, or may be from time to time, involved in ongoing litigation.
In addition, as described in Note 9 Commitments and Contingencies , in the notes to consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K, we may be currently, or may be from time to time, involved in ongoing litigation.
These forward-looking statements include, but are not limited to, those matters discussed under the heading “Forward-looking Statements.” Our actual results could differ materially from those anticipated by these forward‑looking statements due to various factors, including, but not limited to, those set forth under Item 1A. Risk Factors of this Form 10-K and elsewhere in this document.
These forward-looking statements include, but are not limited to, those matters discussed under the heading “Forward-looking Statements.” Our actual results could differ materially from those anticipated by these forward‑looking statements due to various factors, including, but not limited to, those set forth under Item 1A. Risk Factors of this Annual Report on Form 10-K and elsewhere in this document.
For 2025, we expect general and administrative expenses to increase modestly from 2024 levels as we continue to apply a disciplined approach to focus our investments in areas that offer the greatest opportunities. Non-Operating Income (Expense) - Interest Income Interest income consists primarily of interest income earned on our invested cash, cash equivalents and marketable securities.
For 2026, we expect general and administrative expenses to increase modestly from 2025 levels as we continue to apply a disciplined approach to focus our investments in areas that offer the greatest opportunities. 54 Non-Operating Income (Expense) - Interest Income Interest income consists primarily of interest income earned on our invested cash, cash equivalents and marketable securities.
We generate services revenue from sales of post contract support (“PCS”), which is bundled with sales of products and technical services. We offer tiered PCS services under renewable, fee-based PCS contracts, primarily including technical support, hardware repair and replacement parts, and software upgrades on a when-and-if-available basis.
We generate services revenue from sales of PCS, which is bundled with sales of products and technical services. We offer tiered PCS services under renewable, fee-based PCS contracts, primarily including technical support, hardware repair and replacement parts, and software upgrades on a when-and-if-available basis.
Discussions of fiscal 2022 items and year-to-year comparisons between fiscal 2023 and 2022 that are not included in this Form 10-K can be found in "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II, Item 7 of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC on February 29, 2024.
Discussions of fiscal 2024 items and year-to-year comparisons between fiscal 2024 and 2023 that are not included in this Annual Report on Form 10-K can be found in "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II, Item 7 of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC on February 25, 2025.
Revenue in these arrangements is recognized ratably as the services are provided. A substantial portion of our revenue is from sales of our products and services through distribution channels, such as resellers and distributors. Our customers predominantly purchase PCS services in conjunction with purchases of our products.
Revenue in these arrangements is recognized over time as the services are provided. A substantial portion of our revenue is from sales of our products and services through distribution channels, such as resellers and distributors. Our customers predominantly purchase PCS services in conjunction with purchases of our products.
Provision for Income Taxes We recorded a provision for income tax of $8.0 million for the year ended December 31, 2024 and $3.8 million for the year ended December 31, 2023. Our deferred tax assets primarily consist of research and development credits, capitalized research and development expenses and accruals and reserves.
Provision for Income Taxes We recorded a provision for income tax of $10.3 million for the year ended December 31, 2025 and $8.0 million for the year ended December 31, 2024. Our deferred tax assets primarily consist of research and development credits, capitalized research and development expenses and accruals and reserves.
Revenue Recognition We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software license and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes post contract support (“PCS”), professional services, training and software-as-a-service offerings.
We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software licenses and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes post contract support (“PCS”), professional services, training and software-as-a-service (”SaaS”) offerings.
We report two customer verticals: service providers, which accounted for 57% and 58% of our total revenue during 2024 and 2023, respectively, and enterprise, which accounted for 43% and 42% of our total revenue during 2024 and 2023, respectively.
We report two customer verticals: service providers, which accounted for 60%, 57% and 58% of our total revenue during 2025, 2024 and 2023, respectively, and enterprise, which accounted for 40%, 43% and 42% of our total revenue during 2025, 2024 and 2023, respectively.
The net change in our operating assets and liabilities primarily reflects cash outflows from changes in accrued and other liabilities of $20.8 million, inventory of $6.3 million, accounts payable of $3.0 million and prepaid expenses and other assets of $1.9 million, partially offset by cash inflows from changes in deferred revenue of $14.3 million.
The net change in our operating assets and liabilities primarily reflects cash inflows from changes in accounts receivable of $14.6 million, accrued and other liabilities of $4.6 million and inventory of $3.7 million, partially offset by cash outflows from changes in prepaid expenses and other assets of $8.3 million, deferred revenue of $8.0 million, and accounts payable of $1.5 million.
Our non-cash benefits primarily consisted of non-cash charges of $14.1 million for stock-based compensation and $9.3 million of depreciation and amortization expense.
Our non-cash benefits primarily consisted of non-cash charges of $20.0 million for stock-based compensation and $14.9 million of depreciation and amortization expense.
The $2.5 million increase in research and development expenses in 2024 compared to 2023 was primarily due to an increase of $1.5 million in personnel costs and a $1.3 million increase in equipment and software expense, partially offset by a decrease of $0.6 million in professional services.
The $11.4 million increase in research and development expenses in 2025 compared to 2024 was primarily due to an increase of $12.0 million in personnel costs and a $1.5 million increase in equipment and software expense, partially offset by a decrease of $2.3 million in consultants and professional services.
Most of our contracts with customers, other than renewals of PCS, contain multiple performance obligations with a combination of products and PCS. Products and PCS generally qualify as distinct performance obligations. Our hardware includes embedded ACOS software, which together deliver the essential functionality of our products.
Our customers predominantly purchase PCS services in conjunction with purchases of our products. 57 Most of our contracts with customers, other than renewals of PCS, contain multiple performance obligations with a combination of products and PCS. Products and PCS generally qualify as distinct performance obligations. Our hardware includes embedded ACOS software, which together deliver the essential functionality of our products.
The largest component of our operating expenses is personnel costs which consist of wages, benefits, bonuses, and, with respect to sales and marketing expenses, sales commissions.
The largest component of our operating expenses is personnel costs which consist of wages, benefits, bonuses, and, with respect to sales and marketing expenses, sales commissions. Personnel costs also include stock-based compensation.
Liquidity and Capital Resources As of December 31, 2024, we had cash and cash equivalents of $95.1 million, including $3.9 million held outside the U.S. in our foreign subsidiaries, and $100.4 million of marketable securities. We currently do not have any plans to repatriate our earnings from our foreign operations.
Liquidity and Capital Resources As of December 31, 2025, we had cash and cash equivalents of $71.1 million, including $4.1 million held outside the U.S. in our foreign subsidiaries, and $306.7 million of marketable securities. We currently do not have any plans to repatriate our earnings from our foreign operations.
Note 1, Description of Business and Summary of Significant Accounting Policies, in notes to consolidated financial statements in Item 8 of Part II of this Report, describes the significant accounting policies and methods used in the preparation of the consolidated financial statements.
Our actual results could differ from these estimates. Note 1 Description of Business and Summary of Significant Accounting Policies , in notes to consolidated financial statements in Item 8 of Part II of this Report, describes the significant accounting policies and methods used in the preparation of the consolidated financial statements.
The decrease was primarily due to lower products revenue driven by a decrease in demand from our service provider customers. 53 Cost of Revenue, Gross Profit and Gross Margin Cost of Revenue Cost of products revenue is primarily comprised of cost of third-party manufacturing services and cost of inventory for the hardware component of our products.
The increase was primarily a result of higher products revenue driven by an increase in demand from our service provider customers. 52 Cost of Revenue, Gross Profit and Gross Margin Cost of Revenue Cost of products revenue is primarily comprised of cost of third-party manufacturing services and cost of inventory for the hardware component of our products.
During the year ended December 31, 2023, the Company repurchased 1.3 million shares for a total cost of $16.0 million. In October 2021, our Board approved the initiation of a regular quarterly cash dividend on our common stock.
During the year ended December 31, 2024, the Company repurchased 2.2 million shares for a total cost of $30.1 million under the 2024 and 2023 Programs. In October 2021, the Board of Directors approved the initiation of a regular quarterly cash dividend on our common stock.
The favorable change in deferred revenues was attributable to the timing of service contract bookings. 57 Cash Flows from Investing Activities During the year ended December 31, 2024, cash used by investing activities was $48.4 million, consisting of purchases of marketable securities of $142.8 million and capital expenditures of $12.3 million, partially offset by proceeds from maturities of marketable securities of $81.1 million and proceeds from the sales of marketable securities of $25.5 million.
During the year ended December 31, 2024, cash used by investing activities was $48.4 million, consisting of purchases of marketable securities of $142.8 million and capital expenditures of $12.3 million, partially offset by proceeds from maturities of marketable securities of $81.1 million and proceeds from the sales of marketable securities of $25.5 million.
This section of the Form 10-K generally discusses fiscal 2024 and 2023 items and year-to-year comparisons between fiscal 2024 and 2023.
This section of this Annual Report on Form 10-K generally discusses fiscal 2025 and 2024 items and year-to-year comparisons between fiscal 2025 and 2024.
Statements of Cash Flows The following table summarizes our cash flow related activities (in thousands): Years Ended December 31, 2024 2023 Cash provided by (used in): Operating activities $ 90,492 $ 44,514 Investing activities (48,350) 13,608 Financing activities (44,257) (28,849) Net increase (decrease) in cash and cash equivalents $ (2,115) $ 29,273 Cash Flows from Operating Activities Our cash provided by operating activities is driven primarily by sales of our products and management of working capital investments.
Statements of Cash Flows The following table summarizes our cash flow related activities (in thousands): Years Ended December 31, 2025 2024 Cash provided by (used in): Operating activities $ 84,894 $ 90,492 Investing activities (243,638) (48,350) Financing activities 134,754 (44,257) Net decrease in cash and cash equivalents $ (23,990) $ (2,115) Cash Flows from Operating Activities Our cash provided by operating activities is driven primarily by sales of our products and management of working capital investments.
The Company recorded $5.3 million of investment gains in the year ended December 31, 2024, compared to an immaterial loss in the year ended December 31, 2023. Foreign currency exchange gains and losses had a favorable change of $2.1 million in the year ended December 31, 2024 compared to a favorable change of $0.1 million in 2023.
Foreign currency exchange gains and losses, net had an unfavorable change of $0.3 million in the year ended December 31, 2025 compared to a favorable change of $2.1 million in the year ended December 31, 2024.
The increase was primarily due to higher products and services revenue driven by an increase in demand from our service provider customers. During 2024, $40.2 million, or 16% of total revenue, was generated from EMEA, which represented a 3% decrease compared to 2023.
The decrease was primarily a result of lower products and services revenue driven by a decrease in demand from our service provider and enterprise customers. During 2025, $44.9 million, or 16% of total revenue, was generated from EMEA, which represented a 12% increase compared to 2024.
Interest income was $6.7 million and $5.1 million in the years ended December 31, 2024 and 2023, respectively. 55 Non-Operating Income (Expense) - Interest and Other Income (Expense), Net In the years ended December 31, 2024 and 2023, interest and other income (expense), net consisted primarily of gains on equity investments and foreign currency exchange gains and losses.
Interest income was $11.6 million and $6.7 million in the years ended December 31, 2025 and 2024, respectively. Non-Operating Income (Expense) - Interest and Other Income (Expense), Net In the year ended December 31, 2025, interest and other income (expense), net consisted primarily of interest expense for the 2030 Notes and foreign currency exchange gains and losses.
The $2.7 million decrease in sales and marketing expenses in 2024 compared to 2023 was primarily due to decreases of $3.2 million in personnel costs as a result of a decrease in headcount, partially offset by an increase in marketing events of $0.6 million.
The $1.2 million increase in sales and marketing expenses in 2025 compared to 2024 was primarily due to increases of $1.8 million in personnel costs as a result of an increase in headcount, $0.3 million in equipment expense and $0.3 million of amortization and depreciation expense, partially offset by a decrease in bad debt expense of $1.2 million.
As of December 31, 2024, we had working capital of $183.7 million, accumulated deficit of $40.3 million and total stockholders’ equity of $231.8 million. We plan to continue to invest for long-term growth, and our investment may increase.
As of December 31, 2025, we had working capital of $342.3 million, retained earnings of $1.8 million and total stockholders’ equity of $211.5 million. We plan to continue to invest for long-term growth, and our investment may increase.
The increase was primarily attributable to the increase in PCS sales in connection with our increased installed customer base in the APJ region, and to a lesser extent in the Americas and EMEA regions. During 2024, $134.4 million, or 51% of total revenue, was generated from the Americas region, which represents a 1% increase compared to 2023.
Services revenue increased $1.6 million, or 1%, in 2025 compared to 2024. The increase was primarily attributable to the increase in PCS sales in connection with our increased installed customer base in the Americas region. During 2025, $175.2 million, or 60% of total revenue, was generated from the Americas region, which represents a 30% increase compared to 2024.
However, the payment, amount and timing of future dividends remain within the discretion of our Board and will depend on our results of operations, financial condition, cash requirements, and other factors.
We currently anticipate that we will continue to pay comparable quarterly cash dividends in the future. However, the payment, amount and timing of future dividends remain within the discretion of the Board of Directors and will depend upon our results of operations, financial condition, cash requirements, and other factors.
We outsource the manufacturing of our hardware products to original design manufacturers. We perform quality assurance and testing at our San Jose, Taiwan and Japan distribution centers, as well as at our manufacturers’ locations.
We perform quality assurance and testing at our San Jose, Taiwan and Japan distribution centers, as well as at our manufacturers’ locations.
Additionally, cash used for the payments of cash dividends was $17.8 million. Partially offsetting these cash outflows was $3.6 million of cash proceeds from common stock issuances under our equity incentive plans.
Additionally, cash used for the payments of cash dividends was $17.8 million. Partially offsetting these cash outflows was $3.6 million of cash proceeds from common stock issuances under our equity incentive plans. Critical Accounting Estimates Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the U.S.
See Note 10 Income Taxes , of the notes to consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for further details regarding the Company’s taxes.
The Company’s income tax provision for the year ended December 31, 2025 and 2024, primarily consisted of U.S. federal, state and foreign income taxes. See Note 12 Income Taxes , of the notes to consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for further details regarding the Company’s taxes.
We use a range of amounts to estimate SSP for products and PCS sold together in a contract to determine whether there is a discount to be allocated based on the relative SSP of the various products and PCS. 58 If we do not have an observable SSP, such as when we do not sell a product or service separately, then SSP is estimated using judgment and considering all reasonably available information such as market conditions and information about the size and/or purchase volume of the customer.
If we do not have an observable SSP, such as when we do not sell a product or service separately, then SSP is estimated using judgment and considering all reasonably available information such as market conditions and information about the size and/or purchase volume of the customer.
A summary of our cost of revenue is as follows (dollars in thousands): Years Ended December 31, Increase (Decrease) 2024 2023 Amount Percent Cost of revenue: Products $ 31,218 $ 31,468 $ (250) (1) % Services 20,201 16,494 3,707 22 % Total cost of revenue $ 51,419 $ 47,962 $ 3,457 7 % Gross Margin Gross margin may vary and be unpredictable from period to period due to a variety of factors.
A summary of our cost of revenue is as follows (dollars in thousands): Years Ended December 31, Increase (Decrease) 2025 2024 Amount Percent Cost of revenue: Products $ 33,403 $ 31,218 $ 2,185 7 % Services 26,639 20,201 6,438 32 % Total cost of revenue $ 60,042 $ 51,419 $ 8,623 17 % Gross Margin Gross margin may vary and be unpredictable from period to period due to a variety of factors.
Critical Accounting Estimates Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the U.S. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We evaluate our estimates and assumptions on an ongoing basis.
The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We evaluate our estimates and assumptions on an ongoing basis. Our estimates are based on historical experience and various other assumptions that we believe to be reasonable under the circumstances.
Our customers include leading service providers (cloud, telecommunications, multiple system operators, cable), government organizations, and enterprises. We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software license and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes post contract support (“PCS”), professional services, training and software-as-a-service offerings.
Revenue Recognition We derive revenue from two sources: (i) products revenue, which includes hardware, perpetual software license and subscription offerings, which include term-based license agreements; and (ii) services revenue, which includes PCS, professional services, training and software-as-a-service offerings.
The increase was primarily due to higher services revenue driven by an increase in demand from our enterprise customers. During 2024, $87.2 million, or 33% of total revenue, was generated from APJ, which represents a 12% increase compared to 2023.
The increase was primarily a result of higher products and services revenue driven by an increase in demand from both service provider and enterprise customers. During 2025, $70.5 million, or 24% of total revenue, was generated from APJ, which represents a 19% decrease compared to 2024.
Revenue in these arrangements is recognized over time as the services are provided. A substantial portion of our revenue is from sales of our products and services through distribution channel partners, such as resellers and distributors. Our customers predominantly purchase PCS services in conjunction with purchases of our products other than our software-as-a-service offerings.
Revenue in these arrangements is recognized ratably as the services are provided. A substantial portion of our revenue is from sales of our products and services through distribution channels, such as resellers and distributors.
As a result of the nature of our target market and the current stage of our development, a substantial portion of our revenue comes from a limited number of large end-customers and service providers. Purchases from our ten largest end-customers accounted for 38%, 33% and 41% of our total revenue for 2024, 2023 and 2022, respectively.
As a result of the nature of our target market and the current stage of our development, a substantial portion of our revenue comes from a limited number of large end-customers, including service providers and enterprise customers, in any period.
We sell our products globally to service providers and enterprises that depend on data center applications and networks to generate revenue and manage operations efficiently.
We perform quality assurance and testing at our San Jose, Taiwan and Japan distribution centers, as well as at our manufacturers’ locations. 49 We sell our products globally to service providers and enterprises that depend on data center applications and networks to generate revenue and manage operations efficiently.
Consequently, any acceleration or delay in anticipated product purchases by or deliveries to our largest end-customers could materially impact our revenue and operating results in any quarterly period. This may cause our quarterly revenue and operating results to fluctuate from quarter to quarter and make them difficult to predict.
The timing of these purchases and the delivery of the purchased products are difficult to predict and rely upon customer growth and network enhancements. Consequently, any acceleration or delay in anticipated product purchases by or deliveries to our largest end-customers could materially impact our revenue and operating results in any quarterly period.
Professional services primarily consist of fees for outside accounting, tax, legal, recruiting and other administrative services. The $1.4 million increase in general and administrative expenses in 2024 compared to 2023 was primarily due to an increase of $1.3 million in personnel costs as a result of an increase in variable compensation.
The $4.5 million increase in general and administrative expenses in 2025 compared to 2024 was primarily due to an increases of $1.2 million in legal services, $1.0 million in personnel costs primarily as a result of an increase in variable compensation, $1.0 million in amortization and depreciation, $0.5 million in business insurance and $0.4 million in equipment expense.
We may also elect to raise additional financing to help us pursue our business and strategic objectives. Any additional financing could be dilutive to our existing stockholders.
We may also elect to raise additional financing to help us pursue our business and strategic objectives. Any additional financing could be dilutive to our existing stockholders. In March 2025, the Company issued the 2030 Notes and received net proceeds from the offering of approximately $217.7 million.
A summary of our gross profit and gross margin is as follows (dollars in thousands): Years Ended December 31, 2024 2023 Increase (Decrease) Amount Gross Margin Amount Gross Margin Amount Gross Margin Gross profit: Products $ 108,581 77.7 % $ 109,614 77.7 % $ (1,033) — % Services 101,696 83.4 % 94,124 85.1 % 7,572 (1.7) % Total gross profit $ 210,277 80.4 % $ 203,738 80.9 % $ 6,539 (0.5) % Products gross margin percentage remained flat in 2024 compared to 2023.
A summary of our gross profit and gross margin is as follows (dollars in thousands): Years Ended December 31, 2025 2024 Increase (Decrease) Amount Gross Margin Amount Gross Margin Amount Gross Margin Gross profit: Products $ 133,683 80.0 % $ 108,581 77.7 % $ 25,102 2.3 % Services 96,832 78.4 % 101,696 83.4 % (4,864) (5.0) % Total gross profit $ 230,515 79.3 % $ 210,277 80.4 % $ 20,238 (1.1) % Products gross margin percentage increased to 80.0% in 2025 compared to 77.7% in 2024, primarily due to product and regional mix.
Personnel costs also include stock-based compensation. 54 A summary of our operating expenses is as follows (dollars in thousands): Years Ended December 31, Increase (Decrease) 2024 2023 Amount Percent Operating expenses: Sales and marketing $ 83,300 $ 85,976 $ (2,676) (3) % Research and development 57,726 55,229 2,497 5 % General and administrative 25,283 23,885 1,398 6 % Total operating expenses $ 166,309 $ 165,090 $ 1,219 1 % Sales and Marketing Sales and marketing expenses are our largest functional category of operating expenses and primarily consist of personnel costs.
A summary of our operating expenses is as follows (dollars in thousands): Years Ended December 31, Increase (Decrease) 2025 2024 Amount Percent Operating expenses: Sales and marketing $ 84,467 $ 83,300 $ 1,167 1 % Research and development 69,104 57,726 11,378 20 % General and administrative 29,802 25,283 4,519 18 % Total operating expenses $ 183,373 $ 166,309 $ 17,064 10 % Sales and Marketing Sales and marketing expenses are our largest functional category of operating expenses and primarily consist of personnel costs.
During the year ended December 31, 2023, cash provided in investing activities was $13.6 million, consisting of proceeds from maturities of marketable securities of $64.5 million and proceeds from the sales of marketable securities of $45.4 million, partially offset by purchases of marketable securities of $85.4 million and capital expenditures of $10.9 million.
Cash Flows from Investing Activities During the year ended December 31, 2025, cash used by investing activities was $243.6 million, consisting of purchases of marketable securities of $342.0 million, our acquisition of ThreatX Protect for $19.1 million and capital expenditures of $20.1 million, partially offset by proceeds from maturities of marketable securities of $136.8 million and proceeds from the sales of marketable securities of $0.9 million.
Our end-customers operate in a variety of industries, including telecommunications, technology, industrial, retail, financial, gaming, education and government. Since inception, our customer base has grown rapidly.
Our enterprise customers require secure application delivery, AI-ready infrastructure, and are increasingly concerned about the landscape of cybersecurity threats across their complex networks and emerging AI workloads. Our end-customers operate in a variety of industries, including telecommunications, technology, industrial, retail, financial, gaming, education and government. Since inception, our customer base has grown significantly.
In February 2025, we acquired the assets and key personnel of ThreatX Protect, which expanded our cybersecurity portfolio with WAAP protection (web application and application programming interfaces). We intend to continue to invest for long-term growth.
This may cause our quarterly revenue and operating results to fluctuate from quarter to quarter and make them difficult to predict. In February 2025, we acquired the assets and key personnel of ThreatX Protect, which expanded our cybersecurity portfolio with WAAP protection (web application and application programming interfaces). We offer protection under A10 Defend ThreatX Protect.
The unfavorable change in accounts receivable was due to the timing of collections from our customers. During the year ended December 31, 2023, cash provided by operating activities was $44.5 million, consisting of net income of $40.0 million and non-cash benefits totaling $22.8 million, partially offset by an unfavorable net change in operating assets and liabilities of $18.3 million.
During the year ended December 31, 2025, cash provided by operating activities was $84.9 million, consisting of net income of $42.1 million, non-cash benefits totaling $37.8 million and a favorable net change in operating assets and liabilities of $5.0 million.
A summary of our total revenue is as follows (dollars in thousands): Years Ended December 31, 2024 2023 Increase (Decrease) Amount Percent of Total Revenue Amount Percent of Total Revenue Amount Percent Revenue: Products $ 139,799 53 % $ 141,082 56 % $ (1,283) (1) % Services 121,897 47 % 110,618 44 % 11,279 10 % Total revenue $ 261,696 100 % $ 251,700 100 % $ 9,996 4 % Revenue by geographic region: Americas $ 134,356 51 % $ 132,745 53 % $ 1,611 1 % United States 117,707 45 % 113,766 45 % 3,941 3 % Americas-other 16,649 6 % 18,979 8 % (2,330) (12) % APJ 87,175 33 % 77,606 31 % 9,569 12 % EMEA 40,165 16 % 41,349 16 % (1,184) (3) % Total revenue $ 261,696 100 % $ 251,700 100 % $ 9,996 4 % Total revenue increased by $10.0 million, or 4%, in 2024 compared to 2023.
A summary of our total revenue is as follows (dollars in thousands): Years Ended December 31, 2025 2024 Increase (Decrease) Amount Percent of Total Revenue Amount Percent of Total Revenue Amount Percent Revenue: Products $ 167,086 58 % $ 139,799 53 % $ 27,287 20 % Services 123,471 42 % 121,897 47 % 1,574 1 % Total revenue $ 290,557 100 % $ 261,696 100 % $ 28,861 11 % Revenue by geographic region: Americas $ 175,181 60 % $ 134,356 51 % $ 40,825 30 % United States 160,528 55 % 117,707 45 % 42,821 36 % Americas-other 14,653 5 % 16,649 6 % (1,996) (12) % APJ 70,524 24 % 87,175 33 % (16,651) (19) % EMEA 44,852 16 % 40,165 15 % 4,687 12 % Total revenue $ 290,557 100 % $ 261,696 99 % $ 28,861 11 % Total revenue increased by $28.9 million, or 11%, in 2025 compared to 2024 as a result of an increase of $27.3 million in products revenue and an increase of $1.6 million in services revenue.
During the year ended December 31, 2023, cash used in financing activities was $28.8 million consisting primarily of $17.8 million of cash used for the payments of cash dividends and $16.0 million of cash used to repurchase our common stock in the open market, partially offset by $4.9 million of cash proceeds from common stock issuances under our equity incentive plans.
Cash Flows from Financing Activities During the year ended December 31, 2025, cash provided by financing activities was $134.8 million consisting primarily of $217.7 million of net cash proceeds from the issuance of the 2030 Notes and $3.4 million of cash proceeds from common stock issuances under our equity incentive plans.
We sell substantially all of our solutions through our high-touch sales organization as well as distribution channels, including distributors, value-added resellers and system integrators, and fulfill nearly all orders globally through such resellers. 50 We believe this sales approach allows us to obtain the benefits of channel distribution, such as expanding our market coverage, while still maintaining face-to-face relationships with our end-customers.
We believe this sales approach allows us to obtain the benefits of channel distribution, such as expanding our market coverage, while still maintaining face-to-face relationships with our end-customers. We outsource the manufacturing of our hardware products to original design manufacturers.
The Company’s stock repurchase programs do not obligate us to acquire any specific number of shares. Shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Exchange Act.
Shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Exchange Act of 1934 (the “Exchange Act”). During the year ended December 31, 2025, the Company had repurchased 3.7 55 million shares for a total cost of $68.9 million under the 2025 and 2024 Programs.
Sales to these large end-customers have typically been characterized by large but irregular purchases with long sales cycles. The timing of these purchases and the delivery of the purchased products are difficult to predict and rely upon customer growth and network enhancements.
Purchases from our ten largest end-customers accounted for 40%, 38% and 33% of our total revenue for 2025, 2024 and 2023, respectively. Sales to these large end-customers have typically been characterized by large but irregular purchases with long sales cycles.
To date, all repurchases under the Company’s stock repurchase programs have occurred in the open market, in negotiated transactions and from withholding shares in connection with vesting equity awards held by certain employees. During the year 56 ended December 31, 2024, the Company repurchased 2.2 million shares for a total cost of $30.1 million.
Partially offsetting these cash inflows was $68.9 million of cash used to repurchase our common stock in the open market, from privately negotiated transactions and from withholding shares in connection with vesting equity awards held by certain employees and $17.4 million of cash used for the payments of cash dividends.
Services gross margin percentage decreased by 1.7% in 2024 compared to 2023 primarily due to an increase in personnel-related support costs, especially variable compensation. Operating Expenses Our operating expenses consist of sales and marketing, research and development, general and administrative, and restructuring expenses.
Services gross margin percentage decreased to 78.4% in 2025 compared to 83.4% in 2024 primarily due to an increase in personnel-related support costs and the mix of services delivered, which include technical support, training and service costs.
Products revenue decreased $1.3 million, or 1%, in 2024 compared to 2023 primarily driven by lower demand from our service provider and enterprise customers in the Americas, and EMEA regions, partially offset by higher demand from service provider customers in APJ. Services revenue increased $11.3 million, or 10%, in 2024 compared to 2023.
The increase was primarily a result of an increase in demand from our service provider and enterprise customers in the Americas region and an increase in demand from our service provider customers in the EMEA region, partially offset by decreases in demand from service provider and enterprise customers in the APJ region and enterprise customers in the EMEA region.
On November 7, 2024, the Company announced its Board of Directors had authorized a new, non-expiring stock repurchase program under which the Company may repurchase up to $50 million of its outstanding common stock. As of December 31, 2024, the Company had $44.2 million available to repurchase shares. Under these repurchase programs, repurchased shares are held in treasury at cost.
The Board of Directors terminated the 2024 Program on May 1, 2025. Under all programs, repurchased shares are held in treasury at cost. The Company’s stock repurchase programs do not obligate us to acquire any specific number of shares.