In addition to historical information, this Quarterly Report on Form 10-Q
contains forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, as amended, and Section 21E of the Securities and
Exchange Act of 1934, as amended (the "Exchange Act"). These statements include,
among other things, statements concerning our expectations regarding:

•the duration and impact of the COVID-19 pandemic and the implementation of "return to office" plans;

•continued growth and market share gains;

•variability in sales in certain product categories from year to year and between quarters;

•expected impact of sales of certain products and services;



•the impact of macro-economic, geopolitical factors and other disruption on our
manufacturing or sales, including the impact of the COVID-19 pandemic and other
public health issues and natural disasters;

•the proportion of our revenue that consists of our product and service revenue, and the mix of billings between products and services, and the duration of service contracts;

•the impact of our product innovation strategy;

•the effects of government regulation, tariffs and other policies;

•the effects of the global chip shortage and other factors affecting our manufacturing capacity and inventory management;

•drivers of long-term growth and operating leverage, such as sales productivity, functionality and value in our subscription service offerings;



•growing our sales to businesses, service providers and government
organizations, our ability to execute these sales and of the complexity of
selling 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 internal sales organization;

•our ability to hire properly qualified and effective sales, support and engineering employees;

•trends in revenue, cost of revenue and gross margin;

•trends in our operating expenses, including sales and marketing expense, research and development expense, general and administrative expense, and expectations regarding these expenses;



•risks and expectations related to acquisitions and equity interests in private
companies, including integration issues related to product plans and products,
including the acquired technology;

•expectations that our operating expense will increase in absolute dollars during 2021;



•expectations that proceeds from the exercise of stock options in future years
will be adversely impacted by the increased mix of restricted stock units versus
stock options granted;

•estimates of a range of 2021 spending on our headquarters expansion project and of the anticipated completion timeline for the project;



•expectations regarding uncertain tax benefits and our effective domestic and
global tax rates, and the impact of the Tax Cuts and Jobs Act (the "2017 Tax
Act") and the Coronavirus Aid, Relief, and Economic Security Act (the "CARES
Act");

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Table of Contents •expectations regarding spending related to real estate and other capital expenditures and to the impact on free cash flows;

•competition in our markets;

•statements regarding 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 forward-looking statements are subject to certain risks and uncertainties
that could cause our actual results to differ materially from those reflected in
the forward-looking statements. Factors that could cause or contribute to such
differences include, but are not limited to, those discussed in this Quarterly
Report on Form 10-Q and, in particular, the risks discussed under the heading
"Risk Factors" in Part II, Item 1A of this Quarterly Report on Form 10-Q and
those discussed in other documents we file with the Securities and Exchange
Commission (the "SEC"). 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 global leader in cybersecurity solutions provided to a wide
variety of organizations, including enterprises, communication and security
service providers, government organizations and small businesses. Our
cybersecurity solutions are designed to provide broad visibility and
segmentation of the digital attack surface through our integrated Fortinet
Security Fabric platform, which features automated protection, detection and
response. The Fortinet Security Fabric platform leverages a common operating
system or integration to this operating system across our product offerings and
helps organizations secure their environments and reduce their security and
network complexities. The Fortinet Security Fabric platform has an open
architecture designed to connect Fortinet solutions and third-party solutions
into a single ecosystem, enabling integration and automation.

Our product offerings consist of our FortiGate network security products and our
non-FortiGate products. Our FortiGate hardware and software licenses are sold
with a set of security services in addition to networking features. Our security
services are enabled by FortiGuard Labs, which provides threat research and
artificial intelligence capabilities from a cloud network to deliver protection
services to each FortiGate appliance and virtual machine and each non-FortiGate
product that is registered by the end-customer.

Our FortiOS operating system, associated security and networking functions, and
products that run or are integrated with FortiOS are combined to form the
Fortinet Security Fabric platform. This approach to security ties discrete
security solutions together into an integrated whole that provides centralized
management and visibility, automation and intelligence sharing to simplify
network and security operations and rapid response to threats.

Our proprietary Security Processing Units ("SPUs") are Application-Specific
Integrated Circuits that are designed to enhance the security processing
capabilities implemented in software by accelerating computationally intensive
tasks such as firewall policy enforcement, software-defined wide-area network
("SD-WAN"), network address translation, Intrusion Prevention Systems ("IPS"),
threat detection and encryption.

FortiOS provides the foundation for the operation of all FortiGate network
security appliances, whether physical, virtual, private- or public-cloud based,
and is at the heart of the Fortinet Security Fabric platform. We make regular
updates to FortiOS available through our FortiCare support services. The
security and networking capabilities of the Fortinet Security Fabric platform
are controlled through FortiOS. FortiOS directs the operations of processors and
SPUs and provides system management functions.

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The focus areas of our business consist of:

•Security-Driven Networking-We derive a majority of product sales from our
FortiGate network security appliances. Our FortiGate network security appliances
include a broad set of built-in security and networking features and
functionalities, including firewall, next-generation firewall, secure web
gateway, secure sockets layer ("SSL") inspection, software-defined wide area
network ("SD-WAN"), Intrusion Prevention system ("IPS"), sandboxing, data leak
prevention, virtual private network ("VPN"), switch and wireless controller and
wide area network ("WAN") edge. Our network security appliances are managed by
our FortiOS network operating system, which provides the foundation for
FortiGate security functions. We enhance the performance of our network security
appliances from branch to data center by designing and implementing Security
Processing Units ("SPUs") technology within our appliances, enabling us to add
security and network functionality with minimal impact to network throughput
performance.

•Infrastructure Security-The Fortinet Security Fabric platform extends beyond
the network to cover other attack vectors. Other infrastructure solutions
covered include Zero Trust Access solutions that provide teleworker and remote
security such as FortiAuthenticator, FortiClient and FortiToken, as well as
Secure Access (Wi-Fi and switch). Fortinet also extends, protects, and enables
customer cloud on-ramp needs through FortiSASE, our Secure Access Service Edge
(SASE) solution that is a cloud-delivered service that combines network and
security functions with WAN capabilities.

•Adaptive Cloud Security-We help customers connect securely to and across their
individual, hybrid and multi-cloud environments by offering security through our
virtual firewall and other software products and through integrated capabilities
with major cloud platforms. Our public and private cloud security solutions,
including virtual appliances and hosted solutions, extend the core capabilities
of the Fortinet Security Fabric platform in and across cloud environments,
delivering security that follows their applications and data. Our Secure SD-WAN
for Multi-Cloud solution automates deployment of an overlay network across
different cloud networks and offers visibility, control and centralized
management that integrates functionality across multiple cloud environments. Our
Cloud Security portfolio also includes securing applications, including email
and web. Fortinet cloud security offerings are available for deployment in major
public and private cloud environments, including Amazon Web Services, Microsoft
Azure, Google Cloud, Oracle Cloud, Alibaba Cloud, IBM Cloud and VMWare Cloud. We
also offer managed IPS and web application firewall ("WAF") rules delivered by
FortiGuard Labs as an overlay service to native security offerings offered by
Amazon Web Services.

•Endpoint Protection, Internet of Things ("IoT") and Operational Technology
("OT") Security-We protect end-customers from advanced threats that target their
devices and the data that reside on them through our advanced endpoint solutions
that provide core endpoint protection, advanced threat protection, incident
monitoring, and response. Additionally, the proliferation of IoT and OT devices
has generated new opportunities for us to grow our business. We offer network
access control solutions that provide visibility, control and automated event
responses in order to secure IoT devices.

•AI-Driven Security Operations-We develop and provide Artificial Intelligence ("AI") driven security operations solutions, including FortiGuard and other security subscription services, endpoint detection and response, and our security orchestration, automation and response ("SOAR") capabilities and solutions, that can be applied across the entire Fortinet Security Fabric platform. These solutions deliver intelligence and insights.



In addition to our security solutions, our customers may purchase FortiGuard and
other security subscription services to receive threat intelligence updates and
protection updates delivered by FortiGuard Labs, FortiCare technical support
services and the support of Technical Account Managers, Resident Engineers and
professional service consultants for implementations or training services.

Correction of Prior Period Financial Data



As discussed in Note 2 of the notes to condensed consolidated financial
statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q, we
identified an immaterial error related to the commencement of revenue
recognition for certain FortiCare support service contracts, which resulted in
an understatement of revenue during the three months ended March 31, 2020.

The correction of this error resulted in an increase to service revenue, gross
profit and operating income of $0.8 million for the three months ended March 31,
2020. Net income increased by $0.6 million for the three months ended March 31,
2020.

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We evaluated the effect of this correction on the previous results of operations
and determined that it did not materially impact any trends previously
disclosed. This correction did not impact net cash provided by operating
activities, billings or free cash flows.

Financial Highlights



•Total revenue was $710.3 million during the three months ended March 31, 2021,
an increase of 23%, compared to $577.7 million in the same period last year.
Product revenue was $240.7 million during the three months ended March 31, 2021,
an increase of 25%, compared to $192.3 million in the same period last year.
Service revenue was $469.6 million during the three months ended March 31, 2021,
an increase of 22%, compared to $385.4 million in the same period last year.

•Total gross profit was $553.7 million during the three months ended March 31,
2021, an increase of 23%, compared to $449.0 million in the same period last
year.

•We generated operating income of $121.6 million during the three months ended
March 31, 2021, an increase of 4%, compared to $116.7 million in the same period
last year. Operating income during the three months ended March 31, 2021 and
2020 included gains on an intellectual property ("IP") matter of $1.1 million
and $36.8 million, respectively.

•Cash, cash equivalents and investments were $3.09 billion as of March 31, 2021.



•In March 2021, we issued $1.0 billion of Senior Notes. Long-term debt, net of
unamortized discount and debt issuance costs, was $987.0 million as of March 31,
2021. There was no such debt outstanding at December 31, 2020.

•Deferred revenue was $2.75 billion as of March 31, 2021, an increase of $140.3
million, or 5%, from December 31, 2020. Short-term deferred revenue was
$1.47 billion as of March 31, 2021, an increase of $72.3 million, or 5%, from
December 31, 2020.

•We generated cash flows from operating activities of $315.9 million during the
three months ended March 31, 2021, a decrease of $3.5 million, or 1%, compared
to the same period last year. The decrease was mainly due to the $50.0 million
proceeds from an IP matter in the first quarter of 2020.

Our revenue growth was driven by both product and service revenue. On a
geographic basis, revenue continues to be diversified, which remains a key
strength of our business. During the three months ended March 31, 2021, the
Americas region, the Europe, Middle East and Africa ("EMEA") region and the Asia
Pacific ("APAC") region contributed 41%, 39% and 20% of our total revenue,
respectively, and increased by 20%, 25% and 26% compared to the same period last
year, respectively.

Product revenue grew 25% during the three months ended March 31, 2021 compared
to the same period last year. We experienced revenue growth across many of our
products primarily due to an increase in product revenue from our security
fabric platform products, including our SD-WAN solutions, and software licenses.
Service revenue growth of 22% during the three months ended March 31, 2021,
compared to the same period last year, was driven by the strength of our
FortiGate technical support and other service revenue and FortiGuard and other
security subscription revenue, which grew 23% and 21%, respectively, compared to
the same period last year.

Our billings were diversified on a geographic basis. During the three months
ended March 31, 2021, approximately 50% of our billings in the aggregate were
from over 80 countries that individually contributed less than 3% of our
billings.

During the three months ended March 31, 2021 and 2020, we recognized gains of
$1.1 million and $36.8 million, respectively, on an IP matter in connection with
a mutual covenant-not-to-sue and release agreement with a competitor in the
network security industry. Excluding the gains on the IP matter in the first
quarter of 2020 and 2021, operating expenses as a percentage of revenue
decreased by 2.9 percentage points during the three months ended March 31, 2021
compared to the same period last year. Headcount increased to 8,615 employees
and contractors as of March 31, 2021, a 5% increase compared to 8,238 as of
December 31, 2020 and a 16% increase compared to 7,448 as of March 31, 2020.

COVID-19 Update

The United States and the global community we serve are facing unprecedented
challenges posed by the COVID-19 pandemic. In response to the pandemic, we have
taken a number of actions to protect our employees, including restricting travel
and directing most of our employees to work from home. Where onsite work is
permitted, we have implemented measures such
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as staggered work shifts, social distancing, the use of face coverings, health
safety awareness training and frequent disinfection of shared spaces. In March
2020, we implemented our readiness plans, which include steps to maintain
critical internet infrastructure with many employees working remotely.

We are also continuing to provide free online information technology security
training for the public, aimed at helping high school and college students and
professionals augment their security skill sets to open career opportunities and
to help narrow the security skills gap. As of March 31, 2021, there have been
over 950,000 registrations for our free online trainings since we launched the
program. We will continue to provide free online trainings throughout 2021.

While the broader implications of the COVID-19 pandemic on our employees and
overall financial performance remain uncertain, we have seen certain impacts on
our business and operations, results of operations, financial condition, cash
flows, liquidity and capital and financial resources as of and during the three
months ended March 31, 2021. Conversely, some aspects of our business do not
appear to have been significantly affected. During the three months ended
March 31, 2021, we have observed the following:

•In most countries, our employees' ability to travel was reduced. In-person
sales and marketing events or meetings that would normally have been held were
canceled, postponed or converted into virtual events. As a result, expenses
related to travel and marketing events decreased significantly. To the extent
that it becomes safe for our employees to travel and for us to hold or attend
marketing events, these expenses may increase in the future, although we cannot
predict if or when such expenses will increase or return to pre-pandemic levels.

•The countries and geographic regions in which we experienced the fastest
billings growth in the first quarter of 2021, as compared to the first quarter
of 2020, were countries and geographic regions in which the COVID-19 pandemic is
generally considered to have had a comparatively shorter or less severe impact
on the local population and economy during the quarter.

•We have noted that, for some of our customers, sales cycles appear to have lengthened, though it is unclear whether this trend will persist.

•Our average service contract duration increased by approximately two months in the first quarter of 2021 as compared to the first quarter of 2020.

•In order to mitigate supply chain risk and in anticipation of future demand, we have increased our on-hand stock of certain products.



•The yield on investment-grade debt has decreased, and while the risk of credit
losses on our investments and cash equivalents has not changed significantly, as
the debt securities in our portfolio have matured, they have been replaced by
securities with lower effective interest rates. This has contributed to a
decrease in our interest income during the three months ended March 31, 2021,
compared to the same period last year.

•In accordance with the CARES Act, we have deferred the deposit and payment of
our employer's share of Social Security taxes. This did not materially affect
net cash provided by operating activities during the period.
•In addition, we have noted that, in certain countries, the COVID-19 infection
rates have eased which might trigger the transition back to an in-person working
model. We expect our "return to office" plan to be country specific and in line
with local employee health and safety protocols and other regulations.

Through the filing of this Quarterly Report on Form 10-Q, there have been no
material changes to the trends described above. Going forward, however, the
situation is uncertain, rapidly changing and hard to predict, and the COVID-19
pandemic may have a material negative impact on our future periods. If we
experience significant changes in our billings growth rates, it will impact
product revenue in the current quarter and FortiGuard and FortiCare service
revenues in subsequent quarters, as we sell annual and multi-year service
contracts that are recognized ratably over the contractual service term. In
addition, the broader implications of the pandemic on our business and
operations and our financial results, including the extent to which the effects
of the pandemic will impact future results and growth in the cybersecurity
industry, remain uncertain. The duration and severity of the economic downturn
from the pandemic may negatively impact our business and operations, results of
operations, financial condition, cash flows, liquidity and capital and financial
resources in a material way. As a result, the effects of the pandemic may not be
fully reflected in our results of operations until future periods. For further
discussion, see Part II, Item 1A of this Quarterly Report on Form 10-Q.

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Business Model

We typically sell our security solutions to distributors that sell to networking
security focused resellers and to service providers and managed security service
providers ("MSSPs"), who, in turn, sell to end-customers. At times, we also sell
directly to large service providers and major systems integrators who may sell
to our end-customers or use our products and services to provided hosted
solutions to other enterprises. Our end-customers are located in over 80
countries and include small, medium and large enterprises and government
organizations across a wide range of industries, including telecommunications,
government, financial services, retail, technology, education, manufacturing and
healthcare. An end-customer deployment may involve as few as one or as many as
thousands of appliances and other Fortinet Security Fabric platform products,
depending on the end-customer's size and security requirements.

We also offer our products through major cloud providers, and have recognized
revenue on a usage basis from Amazon Web Services, Microsoft Azure, Google
Cloud, Oracle Cloud, Alibaba Cloud and IBM Cloud. We have also recognized
revenue from customers who deploy our products in a bring-your-own-license
("BYOL") arrangement in private clouds or at cloud providers. In a BYOL
arrangement, a customer purchases a software license from us through our channel
partners and deploys the software in a cloud provider's environment. Similarly,
customers may purchase such a license from us and deploy in third-party clouds
or in their private cloud.

Our customers purchase our hardware products and software licenses, as well as
our FortiGuard and other security subscription and FortiCare technical support
services. We generally invoice at the time of our sale for the total price of
the products and security and technical support services. Standard payment terms
are generally no more than 60 days, though, as noted in the COVID-19 Update
above, we have offered extended payment terms to certain distributor customers.

Key Metrics



We monitor a number of key metrics, including the key financial metrics set
forth below, in order to help us evaluate growth trends, establish budgets,
measure the effectiveness of our sales and marketing efforts, and assess
operational efficiencies. The following table summarizes revenue, deferred
revenue, billings (non-GAAP), net cash provided by operating activities, and
free cash flow (non-GAAP). We discuss revenue below under "Results of
Operations," and we discuss net cash provided by operating activities below
under "-Liquidity and Capital Resources." Deferred revenue, billings (non-GAAP),
and free cash flow (non-GAAP) are discussed immediately below the following
table:
                                                     Three Months Ended Or As Of
                                                 March 31, 2021           March 31, 2020
                                                            (in millions)
Revenue                                     $        710.3               $         577.7
Deferred revenue                            $      2,745.6               $       2,199.2
Billings (non-GAAP)                         $        850.6               $         667.8
Net cash provided by operating activities   $        315.9               $         319.4
Free cash flow (non-GAAP)                   $        263.8               $         241.8



Deferred revenue. Our deferred revenue consists of amounts that have been
invoiced but that have not yet been recognized as revenue. The majority of our
deferred revenue balance consists of the unrecognized portion of service revenue
from FortiGuard and other security subscription and FortiCare technical support
service contracts, which is recognized as revenue ratably over the contractual
service period. We monitor our deferred revenue balance, deferred revenue growth
and the mix of short-term and long-term deferred revenue because deferred
revenue represents a significant portion of free cash flow and of revenue to be
recognized in future periods. Deferred revenue was $2.75 billion as of March 31,
2021, an increase of $140.3 million, or 5%, from December 31, 2020.

Billings (non-GAAP). We define billings as revenue recognized in accordance with
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. 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 a
number of limitations related to the use of billings instead of GAAP revenue.
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. Management accounts for these limitations by
providing specific information regarding GAAP revenue and evaluating billings
together with GAAP revenue. Total billings were $850.6
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million for the three months ended March 31, 2021, an increase of 27% compared
to $667.8 million in the same period last year.

A reconciliation of revenue, the most directly comparable financial measure
calculated and presented in accordance with GAAP, to billings is provided below:
                                                     Three Months Ended
                                             March 31, 2021      March 31, 2020
                                                       (in millions)
          Billings:
          Revenue                           $    710.3          $        577.7
          Add: Change in deferred revenue        140.3                    90.1

          Total billings (non-GAAP)         $    850.6          $        667.8



Free cash flow (non-GAAP). 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 believe free cash flow to be a liquidity
measure that provides useful information to management and investors about the
amount of cash generated by the business that, after capital expenditures, can
be used for strategic opportunities, including repurchasing outstanding common
stock, investing in our business, making strategic acquisitions and
strengthening the balance sheet. 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.
Management accounts for this limitation by providing information about our
capital expenditures and other investing and financing activities on the face of
the consolidated statements of cash flows and under "-Liquidity and Capital
Resources" and by presenting cash flows from investing and financing activities
in our reconciliation of free cash flow. In addition, it is important to note
that other companies, including companies in our industry, may not use free cash
flow, may calculate free cash flow in a different manner than we do or may use
other financial measures to evaluate their performance, all of which could
reduce the usefulness of free cash flow as a comparative measure. 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:
                                                                            

Three Months Ended


                                                                      March 31, 2021           March 31, 2020
                                                                                   (in millions)
Free Cash Flow:
Net cash provided by operating activities                           $         315.9          $         319.4
Less: Purchases of property and equipment                                     (52.1)                   (27.6)
Less: Proceeds from IP matter                                                     -                    (50.0)

Free cash flow (non-GAAP)                                           $         263.8          $         241.8
Net cash provided by (used in) investing activities                 $        (473.5)         $           4.6
Net cash provided by (used in) financing activities                 $       

956.0 $ (920.4)

Critical Accounting Policies and Estimates



Our discussion and analysis of our financial condition and results of operations
are based upon our financial statements, which have been prepared in accordance
with GAAP. These principles require us to make estimates and judgments that
affect the reported amounts of assets, liabilities, revenue, cost of revenue and
expenses, and related disclosures. We base our estimates on historical
experience and on various other assumptions that we believe to be reasonable
under the circumstances. To the extent that there are material differences
between these estimates and our actual results, our future financial statements
will be affected.

There were no material changes to our critical accounting policies and estimates
as of and for the three months ended March 31, 2021, as compared to the critical
accounting policies and estimates described in our Annual Report on Form 10-K
filed with the SEC on February 19, 2021 (the "Form 10-K").

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Recent Accounting Pronouncements

See Note 1 of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q for information regarding recent accounting pronouncements.

Results of Operations

Three Months Ended March 31, 2021 and March 31, 2020



Revenue
                                        Three Months Ended
                               March 31,                   March 31,
                                  2021                       2020
                                         % of                       % of
                          Amount        Revenue       Amount       Revenue      Change       % Change
                                              (in millions, except percentages)
Revenue:
Product                 $   240.7          34  %    $  192.3          33  %    $  48.4           25  %
Service                     469.6          66          385.4          67          84.2           22
Total revenue           $   710.3         100  %    $  577.7         100  %    $ 132.6           23  %
Revenue by geography:
Americas                $   290.9          41  %    $  242.6          42  %    $  48.3           20  %
EMEA                        275.7          39          221.0          38          54.7           25
APAC                        143.7          20          114.1          20          29.6           26
Total revenue           $   710.3         100  %    $  577.7         100  %    $ 132.6           23  %



Total revenue increased by $132.6 million, or 23%, during the three months ended
March 31, 2021 compared to the same period last year. We continued to experience
largely organic revenue growth (i.e. revenue growth excluding attribution from
acquisitions) with diversification of revenue geographically, and across both
customer and industry segments. Revenue from all regions grew, with EMEA
contributing the largest portion of the increase on an absolute dollar basis and
APAC contributing the largest growth on a percentage basis.

Product revenue increased by $48.4 million, or 25%, during the three months ended March 31, 2021 compared to the same period last year. We experienced revenue growth across many of our products primarily due to an increase in product revenue from our security fabric platform products, including our SD-WAN solutions, and software licenses.



Service revenue increased by $84.2 million, or 22%, during the three months
ended March 31, 2021 compared to the same period last year. FortiGuard security
subscription and FortiCare technical support and other revenues increased by
$43.9 million, or 21%, and by $40.3 million, or 23%, respectively, during the
three months ended March 31, 2021 compared to the same period last year. The
increases were primarily due to the recognition of revenue from our growing
deferred revenue balance related to FortiGuard and other security subscriptions
and FortiCare technical support, including our customers moving to higher-tier
support offerings.

Of the service revenue recognized during the three months ended March 31, 2021, 89% was included in the deferred revenue balance as of December 31, 2020.


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Cost of revenue and gross margin
                                         Three Months Ended
                                      March 31,       March 31,
                                         2021           2020         Change      % Change
                                               (in millions, except percentages)
             Cost of revenue:
             Product                 $    91.3       $   76.3       $ 15.0           20  %
             Service                      65.3           52.4         12.9           25
             Total cost of revenue   $   156.6       $  128.7       $ 27.9           22  %
             Gross margin (%):
             Product                      62.1  %        60.3  %
             Service                      86.1           86.4
             Total gross margin           78.0  %        77.7  %


Total gross margin increased by 0.3 percentage points during the three months ended March 31, 2021 compared to the same period last year, driven by improvements to product gross margins.



Product gross margin increased by 1.8 percentage points during the three months
ended March 31, 2021 compared to the same period last year. Product gross margin
benefited from lower hardware cost as a percentage of product revenue. Cost of
product revenue was comprised primarily of third-party contract manufacturers'
costs and the costs of materials used in production.

Service gross margin decreased by 0.3 percentage points during the three months ended March 31, 2021 compared to the same period last year. Cost of service revenue was comprised primarily of personnel costs and data center costs.



Operating expenses
                                                                  Three Months Ended
                                                  March 31,                                March 31,
                                                     2021                                    2020
                                                               % of                                   % of
                                         Amount              Revenue             Amount              Revenue             Change             % Change
                                                                              (in millions, except percentages)
Operating expenses:
Research and development              $     97.2          14%                  $   80.3                    14  %       $  16.9                     21  %
Sales and marketing                        304.0                43                260.0                    45             44.0                     17
General and administrative                  32.0                5                  28.8                     5              3.2                     11
Gain on IP matter                           (1.1)               -                 (36.8)                   (6)            35.7                    (97)
Total operating expenses              $    432.1               61%             $  332.3                    58  %       $  99.8                     30  %

Percentages have been rounded for presentation purposes and may differ from unrounded results.





Research and development

Research and development expense increased by $16.9 million, or 21%, during the
three months ended March 31, 2021 compared to the same period last year,
primarily due to an increase of $14.2 million in personnel-related costs as a
result of increased headcount to support the development of new products and
continued enhancements to our existing products. In addition, product
development costs, such as third-party testing and prototypes, increase $3.0
million. We currently intend to continue to invest in our research and
development organization, and expect research and development expense to
increase in absolute dollars during the remainder of 2021.

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Sales and marketing

Sales and marketing expense increased by $44.0 million, or 17%, during the three
months ended March 31, 2021 compared to the same period last year, primarily due
to an increase of $48.5 million in personnel-related costs as a result of
increases to sales and marketing headcount in order to drive global market
revenue increases. This increase was offset by savings related to decreased
travel and fewer in-person marketing events as a result of the COVID-19
pandemic. 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 during the remainder
of 2021.

General and administrative

General and administrative expense increased by $3.2 million, or 11%, during the three months ended March 31, 2021 compared to the same period last year, primarily due to an increase in personnel-related costs of $2.5 million. We currently expect general and administrative expense to increase in absolute dollars during the remainder of 2021.

Gain on IP matter in the first quarter of 2020.



In January 2020, we entered into an agreement with a competitor in the network
security industry, whereby, in February 2020, the competitor party paid us a
lump sum of $50.0 million for a mutual covenant-not-to-sue for patent claims.
During the three months ended March 31, 2021, we recorded $1.1 million in
amortization of the deferred component as a gain on IP matter in our condensed
consolidated statements of income. During the three months ended March 31, 2020,
we recorded $36.0 million upfront and an additional $0.8 million in amortization
of the deferred component as a gain on IP matter in our condensed consolidated
statements of income. See Note 13 of the notes to condensed consolidated
financial statements included in Part I, Item 1 of this Quarterly Report on Form
10-Q for additional information regarding the gain on IP matter in the first
quarter of 2020.

Operating income and margin

We generated operating income of $121.6 million during the three months ended
March 31, 2021, an increase of $4.9 million, or 4%, compared to $116.7
million in the same period last year. Operating income as a percentage of
revenue decreased to 17% during the three months ended March 31, 2021 compared
to 20% in the same period last year. During the first quarter of 2020, we
recorded a one-time upfront gain related to an IP matter, which increased our
operating margin by 6.2 percentage point. Excluding the impact of this gain, our
operating margin increased 3.2 percentage point primarily due to 2.2 percentage
point and 0.5 percentage point decrease in sales and marketing expense and
general and administrative expense as percentage of revenue, as well as 0.3
percentage point improvement in gross margin.

Interest income (expense)-net and other expense-net


                                             Three Months Ended
                                         March 31,          March 31,
                                            2021               2020         Change      % Change
                                                  (in millions, except percentages)

     Interest income (expense)-net   $     (0.2)           $      9.2
$ (9.4)        (102) %
     Other expense-net               $     (2.0)           $     (8.0)     $  6.0          (75) %



The change in interest income (expense)-net during the three months ended
March 31, 2021 compared to the same period last year was primarily due to the
decrease in interest income of $8.1 million, as a result of lower interest
rates. Interest income-net varies depending on our average investment balances
during the period, types and mix of investments, and market interest rates. In
addition, interest expense increased $1.3 million, due to the senior notes
issued in the first quarter of 2021. We expect interest expense to increase
during the remainder of 2021 as a result of the debt issued in March 2021. The
change in other expense-net during the three months ended March 31, 2021
compared to the same period last year was the result of a $4.3 million
impairment charge on an investment in a privately held company in the first
quarter of 2020. In addition, foreign currency exchange losses decreased by $1.5
million compared to the same period last year.
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Provision for income taxes
                                           Three Months Ended
                                        March 31,       March 31,
                                          2021             2020         Change      % Change
                                                 (in millions, except percentages)

         Provision for income taxes   $    12.2        $    13.3       $ (1.1)          (8) %
         Effective tax rate (%)              10   %           11  %



Our effective tax rate was 10% for the three months ended March 31, 2021
compared to an effective tax rate of 11% for the same period last year. The
provision for income taxes for the three months ended March 31, 2021 was
primarily comprised of U.S. federal and state taxes, withholding taxes and
foreign taxes that were $35.7 million. This tax provision for income taxes was
favorably affected by a tax benefit of $7.3 million from the foreign-derived
intangible income deduction and excess tax benefits from stock-based
compensation expense of $16.2 million.

Liquidity and Capital Resources


                                                                   As of
                                                        March 31,      December 31,
                                                          2021             2020
                                                               (in millions)
Cash and cash equivalents                              $ 1,860.2      $     1,061.8
Investments                                              1,227.8              893.8
Total cash, cash equivalents and investments           $ 3,088.0      $     1,955.6
Working capital                                        $ 1,901.5      $       910.9

                                                             Three Months Ended
                                                        March 31,        March 31,
                                                          2021             2020
                                                               (in millions)
Net cash provided by operating activities              $   315.9      $     

319.4

Net cash provided by (used in) investing activities (473.5)

4.6


Net cash provided by (used in) financing activities        956.0            

(920.4)

Net increase (decrease) in cash and cash equivalents $ 798.4 $

(596.4)





Liquidity and capital resources may be impacted by our operating activities, as
well as by our stock repurchases, proceeds from the issuance of common stock
under Amended and Restated Fortinet, Inc. 2009 Equity Incentive Plan (the
"Amended Plan"), investment grade debt issuance and payment of taxes in
connection with the net settlement of equity awards, real estate and other
capital expenditures and business acquisitions.

In recent years, we have received significant capital resources from our
billings to customers and, to some extent, from the exercise of stock options by
our employees. Additional increases in billings may depend on a number of
factors, including demand for our products and services, competition, market or
industry changes, macroeconomic events such as the COVID-19 pandemic and our
ability to execute. We expect proceeds from the exercise of stock options in
future years to be impacted by the increased mix of restricted stock units
versus stock options granted to our employees and to vary based on our share
price.

In February 2020, we received a cash payment of $50.0 million pursuant to a mutual covenant-not-to-sue and release agreement with a competitor in the network security industry.



In July 2020, our board of directors approved a $500.0 million increase in the
authorized stock repurchase amount under the Repurchase Program and extended the
term of the Repurchase Program to February 28, 2022, bringing the aggregate
amount authorized to be repurchased to $3.0 billion. There were no shares
repurchased under the Repurchase Program during the three months ended March 31,
2021. As of March 31, 2021, $1.01 billion remained available for future share
repurchases under the Repurchase Program.

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In March 2021, we issued $1.0 billion aggregate principal amount of senior
notes, consisting of $500.0 million aggregate principal amount of 1.0% notes due
March 15, 2026 and $500.0 million aggregate principal amount of 2.2% notes due
March 15, 2031, in an underwritten registered public offering.

We believe that our cash provided by operating activities, together with our
existing cash, cash equivalents and investments will be sufficient to meet our
anticipated cash needs and do not intend to retire these Notes early. Refer to
Note 12. Debt in Part I, Item 1 of this Quarterly Report on Form 10-Q for
information on the Notes. As of March 31, 2021, the long-term debt, net of
unamortized discount and debt issuance costs, was $987.0 million.

Construction of a second building at our headquarters campus started in the
fourth quarter of 2018 and related spending will continue in 2021 and until
project completion. We estimate 2021 spending on the second building of our
headquarters campus project to be between $50.0 million and $60.0 million, which
was moved from 2020 due to a delay to the project schedule as a result of the
COVID-19 pandemic. We estimate construction to be completed in the first half of
2021.

As of March 31, 2021, our cash, cash equivalents and investments of $3.09
billion were invested primarily in deposit accounts, money market funds,
corporate debt securities, commercial paper, certificates of deposit and term
deposits and U.S. government securities. 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.

The amount of cash, cash equivalents and investments held by our international
subsidiaries was $115.5 million as of March 31, 2021 and $119.8 million as of
December 31, 2020.

We believe that our existing cash and cash equivalents will be sufficient to
meet our anticipated cash needs for at least the next 12 months. Our future
capital 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, 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
or leasing real estate and macroeconomic impacts such as the COVID-19 pandemic.
Historically, we have required capital principally to fund our working capital
needs, share repurchases, capital expenditures and acquisition activities. In
the event that additional financing is required from outside sources, we may not
be able to raise it on terms acceptable to us or at all.

Operating Activities



Cash generated by operating activities is our primary source of liquidity. 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
stock-based compensation, amortization of deferred contract costs and
depreciation and amortization. Changes in operating assets and liabilities
consist primarily of changes in deferred revenue, deferred contract costs and
accounts receivable.

Our operating activities during the three months ended March 31, 2021 provided
cash flows of $315.9 million as a result of the continued growth of our business
and our ability to successfully manage our working capital. Changes in operating
assets and liabilities primarily resulted from an increase in sales of our
FortiGuard and other security subscription services and FortiCare technical
support services to new and existing customers, as reflected by an increase in
our deferred revenue. Our total deferred revenue balance grew $140.3 million, or
5%, during the three months ended March 31, 2021.

Investing Activities



The changes in cash flows from investing activities primarily relate to timing
of purchases, maturities and sales of investments and purchases of property and
equipment. Historically, in making a lease versus ownership decision related to
our larger facilities, we have considered various factors including financial
metrics and the impact on our engineers and other employees. In certain cases,
we have elected to own a facility if we believed that ownership rather than
leasing is more in line with our long-term strategy. We expect to make similar
decisions in the future. We may also make cash payments in connection with
future business combinations.

During the three months ended March 31, 2021, cash used in investing activities
was $473.5 million, driven by $336.1 million spent for purchases of investments,
net of maturities and sales of investments, $75.0 million used for purchases of
investment in a privately held company, $52.1 million of purchases of property
and equipment, a large portion of which relates to our headquarters building
construction, and $10.3 million used for the acquisition of ShieldX Networks,
Inc. ("ShieldX"), net of cash acquisition.

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Financing Activities

The changes in cash flows from financing activities primarily relate to
repurchase and retirement of common stock, taxes paid related to net share
settlement of equity awards, net of proceeds from the issuance of common stock
under the Amended Plan and the issuance of long-term notes, net of discount and
underwriting.

During the three months ended March 31, 2021, cash provided by financing activities was $956.0 million, primarily driven by $989.4 million in cash proceeds from long-term investment grade debt, net of discount and underwriting fees, partially offset by $31.5 million used to pay tax withholding, net of proceeds from the issuance of common stock.

Contractual Obligations and Commitments



  There were no material changes outside the ordinary course of business during
the three months ended March 31, 2021 to the contractual obligations and
commitments disclosed in Management's Discussion and Analysis of Financial
Condition and Results of Operations, set forth in Part II, Item 7, of the Form
10-K. See Note 14 of the notes to condensed consolidated financial statements
included in Part I, Item 1 of this Quarterly Report on Form 10-Q for additional
information regarding contractual obligations and commitments.

Off-Balance Sheet Arrangements



As of March 31, 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.

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