A limitation of using free cash flow rather than the GAAP measures of cash provided by or used in operating activities, investing activities, and financing activities is that free cash flow does not represent the total increase or decrease in the cash and cash equivalents balance for the period because it excludes cash flows from investing activities other than capital expenditures and cash flows from financing activities.
A limitation of using free cash flow rather than the GAAP measures of cash provided by or used in operating activities, investing activities, and financing activities is that free cash flow does not represent the total increase or decrease in the cash and cash equivalents balance for the period because it excludes investing activities other than capital expenditures and cash flows from financing activities.
Other expense—net consists primarily of foreign exchange gains and losses related to foreign currency remeasurement, gains or losses due to the changes in fair value of our marketable equity securities, realized gains and losses of available-for-sale investments, net rental income from real estate, as well as the gain on the sale or the impairment of investments in privately held companies without readily determinable fair values, which are not accounted for under the equity method.
Other income (expense)—net consists primarily of foreign exchange gains and losses related to foreign currency remeasurement, gains or losses due to the changes in fair value of our marketable equity securities, realized gains and losses of available-for-sale investments, net rental income from real estate, as well as the gain on the sale or the impairment of investments in privately held companies without readily determinable fair values, which are not accounted for under the equity method.
We undertake no obligation, and specifically disclaim any obligation, to revise or publicly release the results of any revision to these and any other forward-looking statements. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements. Business Overview Fortinet is a leader in cybersecurity and the convergence of networking and security.
We undertake no obligation, and specifically disclaim any obligation, to revise or publicly release the results of any revision to these and any other forward-looking statements. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements. Business Overview Fortinet is a leader in cybersecurity, driving the convergence of networking and security.
Historically, our interest-bearing investments include corporate debt securities, certificates of deposit and term deposits, commercial paper, money market funds, U.S. government and agency securities and municipal bonds. Interest expense. Interest expense consists of interest expense due to the senior notes and other miscellaneous interest expense. Other expense — net .
Historically, our interest-bearing investments include corporate debt securities, certificates of deposit and term deposits, commercial paper, money market funds, U.S. government and agency securities and municipal bonds. Interest expense. Interest expense consists of interest expense due to the senior notes and other miscellaneous interest expense. Other income (expense) — net .
It is primarily comprised of net income, as adjusted for non-cash items and changes in operating assets and liabilities. Non-cash adjustments consist primarily of amortization of deferred contract costs, stock-based compensation and depreciation and amortization. Changes in operating assets and liabilities consist primarily of changes in deferred revenue, deferred contract costs, deferred tax assets, inventory and accounts receivable—net.
It is primarily comprised of net income, as adjusted for non-cash items and changes in operating assets and liabilities. Non-cash adjustments consist primarily of amortization of deferred contract costs, stock-based compensation and depreciation and amortization. Changes in operating assets and liabilities consist primarily of changes in deferred revenue, deferred contract costs, accrued liabilities, deferred tax assets, inventory and accounts receivable—net.
Business Model We typically sell our security solutions to distributors that sell to networking security focused resellers and to certain service providers and managed security service providers (“MSSPs”), who, in turn, sell to end-customers or use our products and services to provide hosted solutions to other enterprises.
Business Model We typically sell our security solutions to distributors that sell to networking security focused resellers and to certain service providers and managed security service providers, who, in turn, sell to end-customers or use our products and services to provide hosted solutions to other enterprises.
We expect proceeds from the exercise of stock options in future years to be impacted by the increased mix of restricted stock units and performance stock units versus stock options granted to our employees and to vary based on our share price.
We expect proceeds from the exercise of stock options in future years to continue to be impacted by the increased mix of restricted stock units and performance stock units versus stock options granted to our employees and to vary based on our share price.
Product revenue is primarily generated from sales of our physical and virtual machine appliances. The majority of our product revenue continues to be generated by our secure networking product lines. Product revenue also includes revenue from sales of unified SASE and SecOps technologies.
Product revenue is primarily generated from sales of our physical and virtual machine appliances. The majority of our product revenue continues to be generated by our secure networking product lines. Product revenue also includes revenue from sales of unified SASE and SecOps software technologies.
During 2023, 2022 and 2021, we did not have any relationships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Operating Activities Cash generated by operating activities is our primary source of liquidity.
During 2024, 2023 and 2022, we did not have any relationships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Operating Activities Cash generated by operating activities is our primary source of liquidity.
We believe this is due to customer buying patterns typical in this industry. Our quarterly revenue over the past two years has increased sequentially each quarter within the year. Total gross margin has fluctuated on a quarterly basis primarily due to the relative product and service mix.
We believe this is due to customer buying patterns typical in this industry. Our quarterly revenue over the past three years has increased sequentially each quarter within the year. Total gross margin has fluctuated on a quarterly basis primarily due to the relative product and service mix.
We intend to hire additional personnel focused on sales and marketing and expand our sales and marketing efforts worldwide in order to capture market share. • General and administrative . General and administrative expense consists of personnel costs, as well as professional fees, depreciation of property and equipment and software and facility-related expenses.
We intend to hire additional personnel focused on sales and marketing and expand our sales and marketing efforts worldwide in order to capture market share. • General and administrative . General and administrative expense consists of personnel costs, as well as professional fees, depreciation of property and equipment and internal-use software and facility-related expenses.
We have elected to account for the tax effect of the Global Intangible Low-Taxed Income (“GILTI”) as a current period expense. 58 Table of Contents Results of Operations The following tables set forth our results of operations for the periods presented and as a percentage of our total revenue for those periods.
We have elected to account for the tax effect of the Global Intangible Low-Taxed Income (“GILTI”) as a current period expense. 63 Table of Contents Results of Operations The following tables set forth our results of operations for the periods presented and as a percentage of our total revenue for those periods.
Our sales contracts typically contain multiple deliverables, such as hardware, software license, security subscription, technical support services and other services, which are generally capable of being distinct and accounted for as separate performance obligations. Our hardware and software licenses have significant standalone functionalities and capabilities.
Our sales contracts typically contain multiple performance obligations, such as hardware, software license, security subscription, technical support services, cloud and other services, which are generally capable of being distinct and accounted for as separate performance obligations. Our hardware and software licenses have significant standalone functionalities and capabilities.
Historically, in making a lease-versus-ownership decision related to warehouse, office or data center space, we have considered various factors including financial metrics, expected long-term growth rates, time to market and changes in asset values.
Historically, in making a lease-versus-ownership decision related to warehouse, office or data center space, we have considered various factors including financial metrics, expected long-term growth rates, time to market, operating costs and changes in asset values.
As a percentage of total revenue, our product revenue has varied from quarter to quarter. • Service revenue . Service revenue is generated primarily from FortiGuard security subscription services and FortiCare technical support services. We recognize revenue from FortiGuard security subscription and FortiCare technical support services ratably over the service term.
As a percentage of total revenue, our product revenue has varied from quarter to quarter. • Service revenue . Service revenue is generated primarily from FortiGuard and other security subscription services and FortiCare technical support services. We recognize revenue from FortiGuard and other security subscriptions and FortiCare technical support services ratably over the service term.
Accordingly, we believe these are the most critical to fully understand and evaluate our financial condition and results of operations. 56 Table of Contents Revenue Recognition Revenues are recognized when control of goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.
Accordingly, we believe these are the most critical to fully understand and evaluate our financial condition and results of operations. Revenue Recognition Revenues are recognized when control of goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.
We generate the majority of our revenue from sales of our hardware and software products and amortization of amounts included in deferred revenue related to previous sales of FortiGuard security subscription and FortiCare technical support services. We also recognize revenue from cloud security solutions, professional services, and training. Our total revenue is comprised of: • Product revenue .
We generate the majority of our revenue from sales of our hardware and software products and amortization of amounts included in deferred revenue related to previous sales of FortiGuard and other security subscriptions and FortiCare technical support services. We also recognize revenue from cloud security solutions, professional services, and training. Our total revenue is comprised of: • Product revenue .
We currently intend to continue to make investments in sales and marketing resources, which are critical to support our future growth, and expect sales and marketing expense to increase in absolute dollars in 2024.
We currently intend to continue to make investments in sales and marketing resources, which are critical to support our future growth, and expect sales and marketing expense to increase in absolute dollars in 2025.
These statements include, among other things, statements concerning our expectations regarding: • continued growth and market share gains; • variability in sales in certain product and service categories from year to year and between quarters; • expected impact of sales from certain products and services; • increasing or decreasing inflation or stagflation, and changing interest rates in many geographies and changes in currency exchange rates and currency regulations; • competition in our markets; • macroeconomic, geopolitical factors and other disruption on our manufacturing or sales, including public health issues, wars and natural disasters; • real estate investments, management of future growth including expansions and enhancements of current properties; • government regulation, tariffs and other policies; • drivers of long-term growth and operating leverage, such as pricing of our products and services, sales productivity, pipeline and capacity, functionality, value and technology improvements in our service offerings; • growing our solution sales through channel partners to businesses, service providers and government organizations, our ability to execute these sales and the complexity of providing solutions to all segments (including the increased competition and unpredictability of timing associated with sales to larger enterprises), the impact of sales to these organizations on our long-term growth, expansion and operating results, and the effectiveness of our sales organization; • our ability to successfully anticipate market changes related to cloud-based solutions and to sell, support and meet service level agreements related to cloud-based solutions; • growth expectations for the secure networking market; • supply chain constraints, component availability and other factors affecting our manufacturing capacity, delivery, cost and inventory management; • forecasts of future demand and targeted inventory levels, including changing market drivers and demands; • the effect of backlog from prior quarters, including its effect on growth of in-quarter billings and revenue; • instability in the global banking system; • our ability to hire properly qualified and effective sales, support and engineering employees; • risks and expectations related to acquisitions and equity interests in private and public companies, including integration issues related to go-to-market plans, product plans, employees of such companies, controls and processes and the acquired technology, and risks of negative impact by such acquisitions and equity investments on our financial results; • trends in revenue, cost of revenue and gross margin, including expectations regarding product revenue and service revenue growth; 49 Table of Contents • trends in our operating expenses, including sales and marketing expense, research and development expense, general and administrative expense, and expectations regarding these expenses; • expected impact of plans and strategy for the acceleration of our points of presence (“PoP”) deployment; • expectations that our operating expenses will increase year over year in absolute dollars during 2024; • expectations that proceeds from the exercise of stock options in future years will be adversely impacted by the increased mix of restricted stock units and performance stock units versus stock options granted or a decline in our stock price; • expectations regarding uncertain tax benefits and our effective domestic and global tax rates, the impact of interpretations of or changes to tax law, and the timing of tax payments; • expectations regarding spending related to real estate acquisitions and development, including data center, office building and warehouse investments, as well as other capital expenditures and to the impact on free cash flow and expenses; • estimates of a range of 2024 spending on capital expenditures; • expected outcomes and liabilities in litigation; • our intentions regarding share repurchases and the sufficiency of our existing cash, cash equivalents and investments to meet our cash needs, including our debt servicing requirements, for at least the next 12 months; • other statements regarding our future operations, financial condition and prospects and business strategies; and • adoption and impact of new accounting standards.
These statements include, among other things, statements concerning our expectations regarding: • continued growth and market share gains; • variability in sales in certain product and service categories from year to year and between quarters; • expected impact of sales from certain products and services; • increasing or decreasing inflation or stagflation, and changing interest rates in many geographies and changes in currency exchange rates and currency regulations; • competition in our markets; • macroeconomic, geopolitical factors and other disruption on our manufacturing or sales, including the transition in administrations, tariffs or other trade disruptions, public health issues, wars, natural disasters and economic growth; • government regulation, tariffs and other policies; • drivers of long-term growth and operating leverage, such as pricing of our products and services, sales productivity, pipeline and capacity, functionality, value and technology improvements in our service offerings; • growing our solution sales through channel partners to businesses, service providers and government organizations, our ability to execute these sales and the complexity of providing solutions to all segments (including the increased competition and unpredictability of timing associated with sales to larger enterprises), the impact of sales to these organizations on our long-term growth, expansion and operating results, and the effectiveness of our sales organization; • our ability to successfully anticipate market changes, including those related to cloud-based solutions and to sell, support and meet service level agreements related to cloud-based solutions; • growth expectations for the secure networking market; • supply chain constraints, component availability and other factors affecting our manufacturing capacity, delivery, cost and inventory management; • forecasts of future demand and targeted inventory levels, including changing market drivers and demands; • the effect of backlog from current or prior quarters, including its effect on growth of in-quarter billings and revenue; • our ability to hire properly qualified and effective sales, support and engineering employees; • risks and expectations related to acquisitions and equity interests in private and public companies, including integration issues related to go-to-market plans, product plans, employees of such companies, controls and processes and the acquired technology, and risks of negative impact by such acquisitions and equity investments on our financial results; • trends in revenue, cost of revenue and gross margin, including expectations regarding product revenue, service revenue and inventory related charges; • trends in our operating expense, including sales and marketing expense, research and development expense, general and administrative expense, and expectations regarding these expenses; 53 Table of Contents • expected impact of plans and strategy for the acceleration of our data center footprint and our points of presence deployment; • expectations that our operating expense will increase year over year in absolute dollars during 2025; • expectations that proceeds from the exercise of stock options in future years will be adversely impacted by the increased mix of restricted stock units and performance stock units versus stock options granted or a decline in our stock price; • uncertain tax benefits and our effective domestic and global tax rates, the impact of interpretations of or changes to tax law, and the timing of tax payments; • expectations regarding spending related to real estate assets, acquisitions and development, including data centers and points of presence, office building and warehouse investments, as well as other capital expenditures and to the impact on free cash flow and expenses; • estimates of a range of 2025 spending on capital expenditures; • expansions and other changes to our real property holdings and development; • expected outcomes and liabilities in litigation; • our intentions regarding share repurchases and the sufficiency of our existing cash, cash equivalents and investments to meet our cash needs, including our debt servicing requirements, for at least the next 12 months; • other statements regarding our future operations, financial condition and prospects and business strategies; and • adoption and impact of new accounting standards.
We determine revenue recognition through the following steps: • identification of a contract or contracts with a customer; • identification of the performance obligations in a contract, including evaluation of performance obligations as to being distinct goods or services in a contract; • determination of a transaction price; • allocation of a transaction price to the performance obligations in a contract; and • recognition of revenue when, or as, we satisfy a performance obligation.
We determine revenue recognition through the following steps: • identification of a contract or contracts with a customer; • identification of the performance obligations in a contract, including evaluation of performance obligations as to being distinct goods or services in a contract; • determination of a transaction price; 61 Table of Contents • allocation of a transaction price to the performance obligations in a contract; and • recognition of revenue when, or as, we satisfy a performance obligation.
The extent of the impact of economic conditions on our operational and financial performance will depend on ongoing developments, including those 52 Table of Contents discussed above and others identified in Part I, Item 1A “Risk Factors” in this Form 10-K.
The extent of the impact of economic conditions on our operational and financial performance will depend on ongoing developments, including those discussed above and others identified in Part I, Item 1A “Risk Factors” in this Form 10-K.
The provision was partially offset by excess tax benefits of $55.1 million from stock-based compensation expense, a tax benefit of $89.5 million from the FDII deduction, and a tax benefit of $14.0 million from federal research and development tax credits.
The 68 Table of Contents provision was partially offset by excess tax benefits of $55.1 million from stock-based compensation expense, a tax benefit of $89.5 million from the FDII deduction, and a tax benefit of $14.0 million from federal research and development tax credits.
First, billings include amounts that have not yet been recognized as revenue and are impacted by the term of FortiGuard security subscription and FortiCare and other support agreements. Second, we may calculate billings in a manner that is different from peer companies that report similar financial measures.
First, billings include amounts that have not yet been recognized as revenue and are impacted by the term of security and support agreements. Second, we may calculate billings in a manner that is different from peer companies that report similar financial measures.
Additional research and development expenses include ASIC and system prototypes and certification-related 55 Table of Contents expenses, depreciation of property and equipment and facility-related expenses. The majority of our research and development is focused on software and hardware development. We record research and development expenses as incurred.
Additional research and development expenses include ASIC and system prototypes and certification-related expenses, depreciation of property and equipment and facility-related expenses. The majority of our research and development is focused on software and hardware development. We record research and development expenses as incurred.
As of December 31, 2023, the long-term debt, net of unamortized discount and debt issuance costs, was $992.3 million. $500.0 million in aggregate principal amount of senior notes is due on March 15, 2026 and $500.0 million in aggregate principal amount of senior notes is due on March 15, 2031.
As of December 31, 2024, the long-term debt, net of unamortized discount and debt issuance costs, was $994.3 million. $500.0 million in aggregate principal amount of senior notes is due on March 15, 2026 and $500.0 million in aggregate principal amount of senior notes is due on March 15, 2031.
Our cost of product revenue also includes supplies, shipping costs, personnel costs associated with logistics and quality control, facility-related costs, excess and obsolete inventory costs, warranty costs and amortization of intangible assets. Personnel costs include compensation benefits and stock-based compensation. • Cost of service revenue .
Our cost of product revenue also includes supplies, shipping costs, personnel costs associated with logistics and quality control, facility-related costs, excess and obsolete inventory costs, charges related to excess inventory commitments and amortization of intangible assets. Personnel costs include compensation benefits and stock-based compensation. • Cost of service revenue .
Service revenue and software licenses have higher gross margins compared to hardware products. Overall gross margin in 2024 will be impacted by service and product revenue mix. Operating expenses . Our operating expenses consist of research and development, sales and marketing and general and administrative expenses.
Generally, service revenue and software licenses have higher gross margins compared to hardware products. Overall gross margin in 2025 will be impacted by service and product revenue mix and their respective gross margins. Operating expenses . Our operating expenses consist of research and development, sales and marketing and general and administrative expenses.
Our total cost of revenue is comprised of: • Cost of product revenue . The majority of the cost of product revenue consists of third-party contract manufacturers’ costs and the costs of materials used in production.
Our total cost of revenue is comprised of: • Cost of product revenue . Cost of product revenue is primarily comprised of third-party contract manufacturers’ costs and the costs of materials used in production.
We define billings as revenue recognized in accordance with generally accepted accounting principles in the United States (“GAAP”) plus the change in deferred revenue from the beginning to the end of the period, less any deferred revenue balances acquired from business combination(s) and adjustment due to adoption of new accounting standard during the period.
We define billings as revenue recognized in accordance with generally accepted accounting principles in the United States (“GAAP”) plus the change in deferred revenue from the beginning to the end of the period less any deferred revenue balances acquired from business combination(s) during the period.
Our provision for income taxes for 2022 reflects an effective tax rate of 3%, compared to an effective tax rate of 2% for 2021. The provision for income taxes for 2022 was comprised primarily of a $233.4 million tax expense related to U.S. federal and state income taxes, other foreign income taxes, foreign withholding taxes and unrecognized tax benefits.
Our provision for income taxes for 2023 reflects an effective tax rate of 11%, compared to an effective tax rate of 3% for 2022. The provision for income taxes for 2023 was comprised primarily of a $302.4 million tax expense related to U.S. federal and state income taxes, other foreign income taxes, foreign withholding taxes and unrecognized tax benefits.
We consider billings to be a useful metric for management and investors because billings drive current and future revenue, which is an important indicator of the health and viability of our business. There are several 53 Table of Contents limitations related to the use of billings instead of GAAP revenue.
We consider billings to be a useful metric for management and investors because billings drive current and future revenue, which is an important indicator of the health and viability of our business and cash flows. There are a number of limitations related to the use of billings instead of GAAP revenue.
At times, we also sell directly to certain large enterprise customers, large service providers and major systems integrators. In addition, we sell our software licenses and services via different cloud service provider platforms, both directly and through our channel partners.
At times, we also sell directly to enterprise customers, service providers, systems integrators and large enterprises. We also sell our software licenses and cloud delivered services via different cloud service provider platforms, both directly and through our channel partners.
We periodically review significant claims and litigation matters for the probability of an adverse outcome. We accrue for a loss contingency if a loss is probable and the amount of the loss can be reasonably estimated. These accruals are generally based on a range of possible outcomes that require significant judgement. Estimates can change as individual claims develop.
We accrue for a loss contingency if a loss is probable and the amount of the loss can be reasonably estimated. These accruals are generally based on a range of possible outcomes that require significant judgement. Estimates can change as individual claims develop.
Additional increases in billings may depend on a number of factors, including demand for and availability of our products and services, competition, pricing actions, market or industry changes, macroeconomic events such as rising inflation and interest rates, economic strength, supply chain capacity and disruptions, international conflicts, including the war in Ukraine and the Israel-Hamas war, and our ability to execute.
Additional increases in billings may depend on a number of factors, including demand for and availability of our products and services, competition, pricing actions, market or industry changes, macroeconomic events such as rising inflation and changing interest rates, economic strength, supply chain capacity and disruptions, tariffs and other trade restrictions, international conflicts, including the war in Ukraine, an increase in installment billing, and our ability to execute.
The provision for income taxes for 2023 w as comprised primarily of a $302.4 million tax expense related to U.S. federal and state income taxes, other foreign income taxes, foreign withholding taxes and unrecognized tax benefits.
The provision for income taxes for 2024 w as comprised primarily of a $454.6 million tax expense related to U.S. federal and state income taxes, other foreign income taxes, foreign withholding taxes and unrecognized tax benefits.
As a global company headquartered in Sunnyvale, California with a large international customer base, the majority of our research and development is in the United States and Canada with a global footprint of support and centers of excellence around the world.
As a global company headquartered in Sunnyvale, California, our research and development is centered in the United States and Canada with a global footprint of support and centers of excellence around the world.
Our operating activities during 2023 provided cash flows of $1.94 billion as a result of the continued growth of our business, improved profitability and our ability to successfully manage our working capital.
Our operating activities during 2024 provided cash flows of $2.26 billion as a result of the continued growth of our business, improved profitability and our ability to successfully manage our working capital.
As of December 31, 2023, our cash, cash equivalents and short-term and long-term investments of $2.44 billion were invested primarily in deposit accounts, commercial paper, corporate debt securities, U.S. government and agency securities, certificates of deposit and term deposits, money market funds, municipal bonds.
As of December 31, 2024, our cash, cash equivalents and short-term and long-term investments of $4.07 billion were invested primarily in deposit accounts, commercial paper, corporate debt securities, U.S. government and agency securities, certificates of deposit and term deposits and money market funds.
In the long term, our ability to support our requirements and plans for cash, including our working capital and capital expenditure requirements will depend on many factors, including our growth rate; the timing and amount of our share repurchases; the expansion of sales and marketing activities, pricing actions, the introduction of new and enhanced products and services offerings; the continuing market acceptance of our products; the timing and extent of spending to support development efforts; our investments in purchasing, developing or leasing real estate; cash tax payments and macroeconomic impacts such as rising inflation and interest rates; the war in Ukraine and the Israel-Hamas war; and instability in the global 65 Table of Contents banking system.
In the long term, our ability to support our requirements and plans for cash, including our working capital and capital expenditure requirements will depend on many factors, including our growth rate; the timing and amount of our share repurchases and debt retirement; the expansion of sales and marketing activities, pricing actions, the introduction of new and enhanced products and services offerings; the continuing market acceptance of our products; the timing and extent of spending to support development efforts; our investments in purchasing, developing or leasing real estate; cash paid for taxes and macroeconomic impacts such as rising inflation and changing interest rates; and the war in Ukraine.
A reconciliation of net cash provided by operating activities, the most directly comparable financial measure calculated and presented in accordance with GAAP, to free cash flow is provided below: 54 Table of Contents Year Ended December 31, 2023 2022 2021 (in millions) Free Cash Flow: Net cash provided by operating activities $ 1,935.5 $ 1,730.6 $ 1,499.7 Less: Purchases of property and equipment (204.1) (281.2) (295.9) Free cash flow (non-GAAP) $ 1,731.4 $ 1,449.4 $ 1,203.8 Net cash provided by (used in) investing activities $ (649.3) $ 763.9 $ (1,325.1) Net cash provided by (used in) financing activities $ (1,570.4) $ (2,130.3) $ 82.8 Components of Operating Results Revenue.
A reconciliation of net cash provided by operating activities, the most directly comparable financial measure calculated and presented in accordance with GAAP, to free cash flow is provided below: Year Ended December 31, 2024 2023 2022 (in millions) Free Cash Flow: Net cash provided by operating activities $ 2,258.1 $ 1,935.5 $ 1,730.6 Less: Purchases of property and equipment (378.9) (204.1) (281.2) Free cash flow (non-GAAP) $ 1,879.2 $ 1,731.4 $ 1,449.4 Net cash provided by (used in) investing activities $ (727.4) $ (649.3) $ 763.9 Net cash used in financing activities $ (50.1) $ (1,570.4) $ (2,130.3) 59 Table of Contents Components of Operating Results Revenue.
Our mission is to secure people, devices and data everywhere. Our integrated platform, the Fortinet Security Fabric, spans secure networking, unified SASE and AI-driven security operations to deliver cybersecurity where our customers need it.
Our mission is to secure people, devices and data everywhere. Our integrated platform, the Fortinet Security Fabric, spans secure networking, unified SASE and AI-driven security operations.
As of December 31, 2023, we had $66.9 million in other contractual commitments having a remaining term in excess of one year that are non-cancelable.
As of December 31, 2024, we had $101.2 million in other contractual commitments having a remaining term in excess of one year that are non-cancelable.
Changes in operating assets and liabilities primarily resulted from an increase in sales of our security subscription services and technical support services to new and existing customers, as reflected by an increase of $1.10 billion in our deferred revenue during 2023.
Changes in operating assets and liabilities primarily resulted from an increase in sales of our security subscription services and technical support services to new and existing customers, as reflected by an increase of $577.8 million in our deferred revenue during 2024.
A reconciliation of revenue, the most directly comparable financial measure calculated and presented in accordance with GAAP, to billings is provided below: Year Ended December 31, 2023 2022 2021 (in millions) Billings: Revenue $ 5,304.8 $ 4,417.4 $ 3,342.2 Add: Change in deferred revenue 1,094.7 1,187.4 847.6 Less: Deferred revenue balance acquired in business combinations — (10.8) (4.1) Less: Adjustment due to adoption of ASU 2021-08 — — (4.3) Total billings (non-GAAP) $ 6,399.5 $ 5,594.0 $ 4,181.4 Free cash flow (non-GAAP).
A reconciliation of revenue, the most directly comparable financial measure calculated and presented in accordance with GAAP, to billings is provided below: Year Ended December 31, 2024 2023 2022 (in millions) Billings: Revenue $ 5,955.8 $ 5,304.8 $ 4,417.4 Add: Change in deferred revenue 625.9 1,094.7 1,187.4 Less: Deferred revenue balance acquired in business combinations (49.2) — (10.8) Total billings (non-GAAP) $ 6,532.5 $ 6,399.5 $ 5,594.0 Free cash flow (non-GAAP).
Liquidity and Capital Resources As of December 31, 2023 2022 2021 (in millions) Cash and cash equivalents $ 1,397.9 $ 1,682.9 $ 1,319.1 Short-term and long-term investments 1,021.5 548.1 1,634.8 Marketable equity securities 21.0 25.5 38.6 Total cash, cash equivalents, investments and marketable equity securities $ 2,440.4 $ 2,256.5 $ 2,992.5 Working capital $ 709.3 $ 732.0 $ 1,282.5 Year Ended December 31, 2023 2022 2021 (in millions) Net cash provided by operating activities $ 1,935.5 $ 1,730.6 $ 1,499.7 Net cash provided by (used in) investing activities (649.3) 763.9 (1,325.1) Net cash provided by (used in) financing activities (1,570.4) (2,130.3) 82.8 Effect of exchange rate changes on cash and cash equivalents (0.8) (0.4) (0.1) Net increase (decrease) in cash and cash equivalents $ (285.0) $ 363.8 $ 257.3 Liquidity and capital resources are primarily impacted by our operating activities, proceeds from issuance of our investment grade debt, as well as cash used on stock repurchases, real estate purchases and other capital expenditures, investments in various companies and business acquisitions. 64 Table of Contents In recent years, we have received significant capital resources from our billings to customers, issuance of investment grade debt and, to some extent, from the exercise of stock options by our employees.
Liquidity and Capital Resources As of December 31, 2024 2023 2022 (in millions) Cash and cash equivalents $ 2,875.9 $ 1,397.9 $ 1,682.9 Short-term and long-term investments 1,126.4 1,021.5 548.1 Marketable equity securities 64.2 21.0 25.5 Total cash, cash equivalents, investments and marketable equity securities $ 4,066.5 $ 2,440.4 $ 2,256.5 Working capital $ 1,910.8 $ 709.3 $ 732.0 Year Ended December 31, 2024 2023 2022 (in millions) Net cash provided by operating activities $ 2,258.1 $ 1,935.5 $ 1,730.6 Net cash provided by (used in) investing activities (727.4) (649.3) 763.9 Net cash used in financing activities (50.1) (1,570.4) (2,130.3) Effect of exchange rate changes on cash and cash equivalents (2.6) (0.8) (0.4) Net increase (decrease) in cash and cash equivalents $ 1,478.0 $ (285.0) $ 363.8 Liquidity and capital resources are primarily impacted by our operating activities, as well as real estate purchases, other capital expenditures, and business acquisitions, payment of taxes in connection with the net settlement of equity awards and proceeds from the issuance of common stock and investment grade debt and repurchases of our common stock. 69 Table of Contents In recent years, we have received significant capital resources from our billings to customers, issuance of investment grade debt and, to some extent, from the exercise of stock options by our employees.
We expect to continue to increase our data centers, PoPs, office and warehouse capacity to support growth and the expansion of existing services or introduction of new services. As we purchase new properties, we will work to incorporate these properties into the environmental goals we have established. We estimate 2024 capital expenditures to be between $370.0 million and $420.0 million.
We expect to continue to increase our data centers, PoPs, office and warehouse capacity to support growth and the expansion of existing services or introduction of new services. As we purchase new properties, we will work to incorporate these properties into the environmental goals we have established.
The Network Firewall solution consists of FortiGate data centers, hyperscale and distributed firewalls, as well as encrypted applications (SSL inspection, Virtual Private Network and 50 Table of Contents IPsec connectivity). Our ability to converge networking and security also enables the ethernet to become an extension of a company’s security infrastructure through FortiSwitch and FortiLink.
Our network firewall offerings consist of a FortiGate data center, hyperscale and distributed firewalls, as well as encrypted applications (SSL inspection, virtual private network and IPsec connectivity). Our ability to converge networking and security also enables the ethernet to become an extension of our customers’ security infrastructure through FortiSwitch and FortiLink.
Year Ended or As of December 31, 2023 2022 2021 (in millions) Revenue $ 5,304.8 $ 4,417.4 $ 3,342.2 Deferred revenue $ 5,735.0 $ 4,640.3 $ 3,452.9 Billings (non-GAAP) $ 6,399.5 $ 5,594.0 $ 4,181.4 Net cash provided by operating activities $ 1,935.5 $ 1,730.6 $ 1,499.7 Free cash flow (non-GAAP) $ 1,731.4 $ 1,449.4 $ 1,203.8 Deferred revenue.
Year Ended or As of December 31, 2024 2023 2022 (in millions) Revenue $ 5,955.8 $ 5,304.8 $ 4,417.4 Deferred revenue $ 6,360.9 $ 5,735.0 $ 4,640.3 Billings (non-GAAP) $ 6,532.5 $ 6,399.5 $ 5,594.0 Net cash provided by operating activities $ 2,258.1 $ 1,935.5 $ 1,730.6 Free cash flow (non-GAAP) $ 1,879.2 $ 1,731.4 $ 1,449.4 Deferred revenue.
These differences result in deferred tax assets, which are included in our consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in our consolidated statements of income become deductible expenses under applicable income tax laws, or loss or credit carryforwards are utilized.
In general, deferred tax assets 62 Table of Contents represent future tax benefits to be received when certain expenses previously recognized in our consolidated statements of income become deductible expenses under applicable income tax laws, or loss or credit carryforwards are utilized.
Year Ended December 31, 2023 2022 2021 (in millions) Consolidated Statements of Income Data: Revenue: Product $ 1,927.3 $ 1,780.5 $ 1,255.0 Service 3,377.5 2,636.9 2,087.2 Total revenue 5,304.8 4,417.4 3,342.2 Cost of revenue: Product 763.6 691.3 487.7 Service 473.6 393.6 295.3 Total cost of revenue 1,237.2 1,084.9 783.0 Gross profit: Product 1,163.7 1,089.2 767.3 Service 2,903.9 2,243.3 1,791.9 Total gross profit 4,067.6 3,332.5 2,559.2 Operating expenses: Research and development 613.8 512.4 424.2 Sales and marketing 2,006.0 1,686.1 1,345.7 General and administrative 211.3 169.0 143.5 Gain on intellectual property matter (4.6) (4.6) (4.6) Total operating expenses 2,826.5 2,362.9 1,908.8 Operating income 1,241.1 969.6 650.4 Interest income 119.7 17.4 4.5 Interest expense (21.0) (18.0) (14.9) Other expense—net (6.1) (13.5) (11.6) Income before income taxes and loss from equity method investments 1,333.7 955.5 628.4 Provision for income taxes 143.8 30.8 14.1 Loss from equity method investments (42.1) (68.1) (7.6) Net income including non-controlling interests 1,147.8 856.6 606.7 Less: net loss attributable to non-controlling interests, net of tax — (0.7) (0.1) Net income attributable to Fortinet, Inc. $ 1,147.8 $ 857.3 $ 606.8 59 Table of Contents Year Ended December 31, 2023 2022 2021 (as percentage of revenue) Revenue: Product 36 % 40 % 38 % Service 64 60 62 Total revenue 100 100 100 Cost of revenue: Product 14 16 15 Service 9 9 9 Total cost of revenue 23 25 23 Gross margin: Product 60 61 61 Service 86 85 86 Total gross margin 77 75 77 Operating expenses: Research and development 12 12 13 Sales and marketing 38 38 40 General and administrative 4 4 4 Gain on intellectual property matter — — — Total operating expenses 53 53 57 Operating margin 23 22 19 Interest income 2 — — Interest expense — — — Other expense—net — — — Income before income taxes and loss from equity method investments 25 22 19 Provision for income taxes 3 1 — Loss from equity method investments (1) (2) — Net income including non-controlling interests 22 19 18 Less: net loss attributable to non-controlling interests, net of tax — — — Net income attributable to Fortinet, Inc. 22 % 19 % 18 % Percentages have been rounded for presentation purposes and may differ from unrounded results.
Year Ended December 31, 2024 2023 2022 (in millions) Consolidated Statements of Income Data: Revenue: Product $ 1,908.7 $ 1,927.3 $ 1,780.5 Service 4,047.1 3,377.5 2,636.9 Total revenue 5,955.8 5,304.8 4,417.4 Cost of revenue: Product 652.0 763.6 691.3 Service 505.6 473.6 393.6 Total cost of revenue 1,157.6 1,237.2 1,084.9 Gross profit: Product 1,256.7 1,163.7 1,089.2 Service 3,541.5 2,903.9 2,243.3 Total gross profit 4,798.2 4,067.6 3,332.5 Operating expenses: Research and development 716.8 613.8 512.4 Sales and marketing 2,044.8 2,006.0 1,686.1 General and administrative 237.8 211.3 169.0 Gain on intellectual property matter (4.6) (4.6) (4.6) Total operating expenses 2,994.8 2,826.5 2,362.9 Operating income 1,803.4 1,241.1 969.6 Interest income 155.2 119.7 17.4 Interest expense (20.0) (21.0) (18.0) Gain on bargain purchase 106.3 — — Other income (expense)—net 13.6 (6.1) (13.5) Income before income taxes and loss from equity method investments 2,058.5 1,333.7 955.5 Provision for income taxes 283.9 143.8 30.8 Loss from equity method investments (29.4) (42.1) (68.1) Net income including non-controlling interests 1,745.2 1,147.8 856.6 Less: net loss attributable to non-controlling interests, net of tax — — (0.7) Net income attributable to Fortinet, Inc. $ 1,745.2 $ 1,147.8 $ 857.3 64 Table of Contents Year Ended December 31, 2024 2023 2022 (as percentage of revenue) Revenue: Product 32 % 36 % 40 % Service 68 64 60 Total revenue 100 100 100 Cost of revenue: Product 11 14 16 Service 8 9 9 Total cost of revenue 19 23 25 Gross margin: Product 66 60 61 Service 88 86 85 Total gross margin 81 77 75 Operating expenses: Research and development 12 12 12 Sales and marketing 34 38 38 General and administrative 4 4 4 Gain on intellectual property matter — — — Total operating expenses 50 53 53 Operating margin 30 23 22 Interest income 3 2 — Interest expense — — — Gain on bargain purchase 2 — — Other income (expense)—net — — — Income before income taxes and loss from equity method investments 35 25 22 Provision for income taxes 5 3 1 Loss from equity method investments — (1) (2) Net income including non-controlling interests 29 22 19 Less: net loss attributable to non-controlling interests, net of tax — — — Net income attributable to Fortinet, Inc. 29 % 22 % 19 % Percentages have been rounded for presentation purposes and may differ from unrounded results.
Product gross margin varies based on the types of products sold, their cost profile and their average selling prices. Service gross margin is impacted by revenue growth and our personnel-related costs, third-party repair and contract fulfillment, data center, colocation fees, cloud hosting, supplies, facility-related costs and foreign currency fluctuations.
Product gross margin varies based on the types of products sold, their cost profile and their average selling prices. Service gross margin is impacted by revenue growth and our personnel-related costs, replacement cost, data center infrastructure, software and delivery costs, colocation and cloud provider fees, facility-related costs and foreign currency fluctuations.
Total gross margin increased 1.3 percentage points in 2023 compared to 2022, primarily driven by a shift in the revenue mix and increased service gross margin, partially offset by decreased product gross margin. Revenue mix shifted by 4.0 percentage points from product revenue to service revenue, as a percentage of total revenue.
Total gross margin increased 3.9 percentage points in 2024 compared to 2023, primarily driven by a shift in the revenue mix to higher margin service revenue and increased product and service gross margin. Revenue mix shifted by 4.3 percentage points from product revenue to service revenue, as a percentage of total revenue.
The increase in our operating margin primarily benefits from a 1.3 percentage points increase in gross margin and 0.4 percentage points decrease in sales and marketing expense as a percentage of revenue, partially offset by 0.2 percentage points increase in general and administrative expense as percentage of revenue.
The increase in our operating margin primarily benefits from 3.9 percentage points increase in gross margin and 3.5 percentage points decrease in sales and marketing expense as a percentage of revenue, partially offset by 0.5 percentage points increase in research and development expense as percentage of revenue.
We define free cash flow as net cash provided by operating activities minus purchases of property and equipment and excluding any significant non-recurring items.
We define free cash flow as net cash provided by operating activities minus purchases of property and equipment.
In addition, non-personnel-related product development costs increased $13.8 million and depreciation expense and other occupancy-related expense increased $11.4 million.
In addition, non-personnel-related product development costs increased $14.1 million and depreciation expense and other occupancy-related expense increased $6.8 million.
The increases in service revenue were primarily due to the recognition of revenue from our growing deferred revenue balance related to FortiGuard and other security subscriptions delivered to on-premise and cloud-based environments. Security subscriptions outpaced technical support growth due to strength in secure networking subscriptions, SecOps and SASE.
The increase was primarily due to the recognition of service revenue from our growing deferred revenue balance related to FortiGuard and other security subscriptions delivered to on-premise and cloud-based environments and strength in unified SASE and SecOps.
In 2023, we repurchased 27.2 million shares of common stock under the Repurchase Program for an aggregate purchase price of $1.50 billion. As of December 31, 2023, $529.1 million remained available for future share repurchases under the Repurchase Program.
In 2024, we repurchased less than 0.1 million shares of common stock under the Repurchase Program for an aggregate purchase price of $0.6 million. As of December 31, 2024, approximately $2.03 billion remained available for future share repurchases under the Repurchase Program.
We currently intend to continue to invest in our research and development organization, and expect research and development expense to increase in absolute dollars in 2024. 62 Table of Contents Sales and marketing Sales and marketing expense increased $319.9 million, or 19%, in 2023 compared to 2022, primarily due to an increase of $244.3 million in personnel-related costs.
We currently intend to continue to invest in our research and development organization, and expect research and development expense to increase in absolute dollars in 2025. 67 Table of Contents Sales and marketing Sales and marketing expense increased $38.8 million, or 2%, in 2024 compared to 2023, primarily due to an increase of $44.0 million in personnel-related costs.
Worsening economic conditions, including inflation, higher interest rates, slower growth, any recession, fluctuations in foreign exchange rates, instability in the global banking industry and other changes in economic conditions, may result in decreased sales productivity and growth and adversely affect our results of operations and financial performance.
Worsening economic conditions, including inflation, changing interest rates, tariffs and other trade disruptions, slower growth, any recession, fluctuations in foreign exchange rates and other changes in economic conditions, may result in decreased sales productivity and 57 Table of Contents growth and adversely affect our results of operations and financial performance.
It is our investment policy to invest excess cash in a manner that preserves capital, provides liquidity and generates return without significantly increasing risk. We do not enter into investments for trading or speculative purposes.
It is our investment policy to invest excess cash in a manner that preserves capital, provides liquidity, and generates return without significantly increasing risk.
Discussion regarding our financial condition and results of operations for 2022 as compared to 2021 can be found in Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the SEC on February 24, 2023. 60 Table of Contents 2023 and 2022 Revenue Year Ended December 31, 2023 2022 Amount % of Revenue Amount % of Revenue Change % Change (in millions, except percentages) Revenue: Product $ 1,927.3 36 % $ 1,780.5 40 % $ 146.8 8 % Service 3,377.5 64 2,636.9 60 740.6 28 Total revenue $ 5,304.8 100 % $ 4,417.4 100 % $ 887.4 20 % Revenue by geography: Americas $ 2,175.2 41 % $ 1,785.0 41 % $ 390.2 22 % EMEA 2,072.9 39 1,691.8 38 381.1 23 APAC 1,056.7 20 940.6 21 116.1 12 Total revenue $ 5,304.8 100 % $ 4,417.4 100 % $ 887.4 20 % Total revenue increased $887.4 million, or 20%, in 2023 compared to 2022.
Discussion regarding our financial condition and results of operations for 2023 as compared to 2022 can be found in Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 26, 2024. 65 Table of Contents 2024 and 2023 Revenue Year Ended December 31, 2024 2023 Amount % of Revenue Amount % of Revenue Change % Change (in millions, except percentages) Revenue: Product $ 1,908.7 32 % $ 1,927.3 36 % $ (18.6) (1) % Service 4,047.1 68 3,377.5 64 669.6 20 Total revenue $ 5,955.8 100 % $ 5,304.8 100 % $ 651.0 12 % Revenue by geography: Americas $ 2,442.2 41 % $ 2,175.2 41 % $ 267.0 12 % EMEA 2,396.2 40 2,072.9 39 323.3 16 APAC 1,117.4 19 1,056.7 20 60.7 6 Total revenue $ 5,955.8 100 % $ 5,304.8 100 % $ 651.0 12 % Total revenue increased $651.0 million, or 12%, in 2024 compared to 2023.
Contingent Liabilities From time to time, we are involved in disputes, litigation and other legal actions. However, there are many uncertainties associated with any litigation, and these actions or other third-party claims against us may cause us to incur substantial settlement charges, which are inherently difficult to estimate and could adversely affect our results of operations.
However, there are many uncertainties associated with any litigation, and these actions or other third-party claims against us may cause us to incur substantial settlement charges, which are inherently difficult to estimate and could adversely affect our results of operations. We periodically review significant claims and litigation matters for the probability of an adverse outcome.
Cost of service revenue is primarily comprised of personnel costs, third-party repair and contract fulfillment, data center costs, colocation expenses and cloud provider fees, supplies, facility-related costs and amortization of intangible assets. Gross margin .
Cost of service revenue is primarily comprised of personnel costs, replacement cost, data center infrastructure, software and delivery costs, colocation and cloud provider fees, facility-related costs and amortization of intangible assets. Gross margin .
Interest income varies depending on our average investment balances during the period, types and mix of investments, and market interest rates. Interest expense increased $3.0 million in 2023 as compared to 2022.
Interest income varies depending on our average investment balances during the period, types and mix of investments, and market interest rates. Interest expense decreased $1.0 million in 2024 as compared to 2023. Gain on bargain purchase was $106.3 million in 2024 and is related to our acquisition of Lacework.
Provision for income taxes Year Ended December 31, Change % Change 2023 2022 (in millions, except percentages) Provision for income taxes $ 143.8 $ 30.8 $ 113.0 367 % Effective tax rate (%) 11 % 3 % Our provision for income taxes for 2023 reflects an effective tax rate of 11%, compared to an effective tax rate of 3% for 2022.
Provision for income taxes Year Ended December 31, Change % Change 2024 2023 (in millions, except percentages) Provision for income taxes $ 283.9 $ 143.8 $ 140.1 97 % Effective tax rate (%) 14 % 11 % Our provision for income taxes for 2024 reflects an effective tax rate of 14%, compared to an effective tax rate of 11% for 2023.
Sales and marketing expense is the largest component of our operating expenses and primarily consists of personnel costs. Additional sales and marketing expenses include product marketing, public relations, field marketing and events and channel marketing programs (e.g., partner cooperative marketing arrangements), as well as travel, depreciation of property and equipment and facility-related expenses.
Additional sales and marketing expenses include product marketing, public relations, field marketing and events and channel marketing programs (e.g., partner cooperative marketing arrangements), as well as travel, depreciation of property and equipment and facility-related 60 Table of Contents expenses.
These proprietary ASICs, combined with off-the-shelf CPUs and ASICs, allow our systems to scale, run multiple applications at higher performance, lower power consumption and perform more processor-intensive operations, such as inspecting encrypted traffic, including streaming video.
When delivered through our network firewall appliances, functionality is accelerated through our proprietary ASIC technology. These proprietary ASICs, allow our systems to scale, run multiple applications at higher performance, lower power consumption and perform more processor-intensive operations, such as inspecting encrypted traffic, including streaming video.
As part of the process of preparing our consolidated financial statements, we are required to estimate our taxes in each of the jurisdictions in which we operate. We estimate actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as accruals and allowances not currently deductible for tax purposes.
We estimate actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets, which are included in our consolidated balance sheets.
Interest income, interest expense and other expense — net Year Ended December 31, 2023 2022 Change % Change (in millions, except percentages) Interest income $ 119.7 $ 17.4 $ 102.3 588 % Interest expense (21.0) (18.0) (3.0) 17 % Other expense—net (6.1) (13.5) 7.4 (55) % Interest income increased $102.3 million in 2023 as compared to 2022, primarily as a result of higher interest rates and investment balances.
Interest income, interest expense, gain on bargain purchase and other income (expense) — net Year Ended December 31, 2024 2023 Change % Change (in millions, except percentages) Interest income $ 155.2 $ 119.7 $ 35.5 30 % Interest expense (20.0) (21.0) 1.0 (5) % Gain on bargain purchase 106.3 — 106.3 100 % Other income (expense)—net 13.6 (6.1) 19.7 (323) % Interest income increased $35.5 million in 2024 as compared to 2023, primarily as a result of higher investment balances.
An end-customer deployment may involve as few as one or as many as thousands of secure networking, unified SASE and security operations technology products, depending on the end-customer’s size and security requirements. Our customers purchase our hardware products, software licenses and cloud-delivered solutions, as well as our FortiGuard and other security subscription and FortiCare technical support services.
An end-customer deployment may involve as few as one or as many as thousands of secure networking, unified SASE and security operations technology products or users, depending on the end-customer’s size and security requirements.
Headcount increased 8% to 13,568 employees as of December 31, 2023, up from 12,595 as of December 31, 2022. Impact of Macroeconomic Developments Our overall performance depends in part on worldwide economic and geopolitical conditions, such as the war in Ukraine and the Israel-Hamas war or tensions between China and Taiwan, and their impact on customer behavior.
Impact of Macroeconomic and Geopolitical Developments Our overall performance depends in part on worldwide economic and geopolitical conditions, such as GDP growth, the war in Ukraine or tensions between China and Taiwan, and their impact on customer behavior.
Of the service revenue recognized in 2023, 67% was included in the deferred revenue balance as of December 31, 2022. Of the service revenue recognized in 2022, 66% was included in the deferred revenue balance as of December 31, 2021.
Of the service revenue recognized in 2023, 67% was included in the deferred revenue balance as of December 31, 2022. Of the service revenue recognized in each quarter of 2024, from 88% to 90% was included in deferred revenue as of the beginning of the respective quarter.
Service revenue growth of 28% in 2023 was primarily driven by the strength of our security subscription revenue, which grew 33%. The increase was primarily due to the recognition of revenue from our growing deferred revenue balance related to FortiGuard and other security subscriptions delivered to on-premise and cloud-based environments.
The increase was primarily due to the recognition of revenue from our growing deferred revenue balance related to FortiGuard and other security subscriptions delivered to on-premise and cloud-based environments and growth in SaaS solutions, including unified SASE and SecOps. Of the service revenue recognized in 2024, 70% was included in the deferred revenue balance as of December 31, 2023.
In addition, changes in operating assets and liabilities were driven by an increase of $353.5 million in deferred contract costs, an increase of $301.9 million in deferred tax assets, an increase of $253.5 million in inventory and an increase of $146.4 million in accounts receivable—net.
In addition, changes in operating assets and liabilities were driven by an increase of $311.1 million in deferred contract costs, an increase of $223.2 million in deferred tax assets, a decrease of $131.2 million in inventory, a decrease of $106.7 million in accrued liabilities, and an increase of $45.4 million in accounts receivable—net.
Management accounts for these limitations by providing specific information regarding GAAP revenue and evaluating billings together with GAAP revenue. Total billings were $6.40 billion in 2023, an increase of 14% compared to $5.59 billion in 2022.
Management accounts for these limitations by providing specific information regarding GAAP revenue and evaluating billings together with GAAP revenue. Total billings were $6.53 billion in 2024, an increase of 2% compared to $6.40 billion in 2023. Our backlog may fluctuate over quarters. A reduction to backlog increases our aggregate billings and revenue during the quarter when delivered.
Deferred tax assets and liabilities are measured using the currently enacted tax rates that 57 Table of Contents apply to taxable income in effect for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.
In addition, deferred tax assets are recorded for the future benefit of utilizing net operating losses and research and development credit carryforwards. Deferred tax assets and liabilities are measured using the currently enacted tax rates that apply to taxable income in effect for the years in which those tax assets and liabilities are expected to be realized or settled.
Revenue from all regions grew, with the Americas contributing the largest portion of the increase on an absolute dollar basis and EMEA, contributing the largest portion of the increase on a percentage basis. Product revenue increased $146.8 million, or 8%, in 2023 compared to 2022 .
We continued to experience diversification of revenue geographically, and across customer and industry verticals. Revenue from all regions grew, with EMEA contributing the largest portion of the increase on an absolute dollar basis and on a percentage basis. Product revenue remained comparatively flat in 2024 compared to 2023 .
Recent Accounting Pronouncements Refer to Note 1 of the notes to our consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for a full description of recently adopted accounting pronouncements.
During 2024, cash used in financing activities was $50.1 million, primarily driven by $37.8 million used to pay tax withholding, net of proceeds from the issuance of common stock. 71 Table of Contents Recent Accounting Pronouncements Refer to Note 1 of the notes to our consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for a full description of recently adopted accounting pronouncements.
FortiGuard Security Services are a suite of AI-powered security capabilities that are natively integrated as part of the Fortinet Security Fabric to deliver coordinated detection and enforcement across the entire attack surface. The portfolio consists of FortiGuard application security services, content security services, device security services, NOC/SOC security services and web security services.
Using millions of global network sensors, FortiGuard Labs monitors the worldwide attack surface and employs AI to mine that data for new threats. FortiGuard and Other Security Services are a suite of AI-powered security capabilities that are natively integrated as part of the Fortinet Security Fabric to deliver coordinated detection and enforcement across the entire attack surface.
The Secure Connectivity solution includes FortiSwitch Secure Ethernet Switches, FortiAP Wireless Local Area Network Access Points and FortiExtender 5G Connectivity Gateways, among other products. • Unified Secure Access Service Edge (SASE) —As applications move to the cloud and work from anywhere becomes established, cloud delivery is needed to enable secure access to applications on any cloud.
Our Secure Connectivity solution includes FortiSwitch secure ethernet switches, FortiAP wireless local area network access points and FortiExtender 5G connectivity gateways. • Unified Secure Access Service Edge (SASE) —As applications move to the cloud and hybrid workforce is now the norm, enabling secure access for users with zero trust framework becomes important.