The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our condensed consolidated
financial statements and related notes appearing elsewhere in this Quarterly
Report on Form 10-Q and our Annual Report on Form 10-K. In addition to
historical financial information, the following discussion and analysis contains
forward-looking statements that are based upon current plans, expectations, and
beliefs that involve risks and uncertainties. Our actual results may differ
materially from those anticipated in these forward-looking statements as a
result of various factors, including, but not limited to, those set forth under
the section titled "Risk Factors" in Item 1A of Part II of this Quarterly Report
on Form 10-Q and in our Annual Report on Form 10-K. Our fiscal year ends January
31.
                                    Overview
Slack is a new layer of the business technology stack where people can work
together more effectively, connect all their other software tools and services,
and find the information they need to do their best work. Slack has very general
and broad applicability. It is not aimed at any one specific purpose, but at
nearly anything that people do together at work. Slack is used to review job
candidates, coordinate election coverage, diagnose network problems, negotiate
budgets, plan marketing campaigns, approve menus, and organize disaster response
teams, along with countless other tasks.
Slack provides an easy way for users to share and aggregate information from
other software, take action on notifications, and advance workflows in a
multitude of third-party applications, over 2,500 of which are listed in the
Slack App Directory. Developers have collectively created more than 935,000
third-party applications or custom integrations that were used in a typical week
during the three months ended April 30, 2021. Further, Slack's platform
capabilities extend beyond integrations with third-party applications and allow
for easy integrations with an organization's internally-developed software.
                      Proposed Transaction with Salesforce
On December 1, 2020, we entered into the Merger Agreement. The Merger Agreement
provides for the merger of Merger Sub I with and into Slack, with Slack
continuing as the surviving corporation and as a wholly owned subsidiary of
Salesforce, immediately followed by a second merger of the surviving corporation
into either Merger Sub II or Salesforce, with either Merger Sub II or Salesforce
continuing as the surviving company.
Under the terms of the Merger Agreement, all of our issued and outstanding
shares of Class A common stock and Class B common stock will be converted into
the right to receive (a) 0.0776 shares of Salesforce common stock and (b) $26.79
in cash, without interest. The Mergers are intended to be treated as a single
integrated transaction that will qualify as a "reorganization" within the
meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended, or
the Code. As a result of the Mergers, we will cease to be a publicly traded
company.
The Merger Agreement contains customary representations, warranties, and
covenants. The consummation of the Mergers is conditioned on the receipt of the
approval of our stockholders, as well as the satisfaction of other customary
closing conditions, including domestic and foreign regulatory approvals and
performance in all material respects by each party of its obligations under the
Merger Agreement. Consummation of the Mergers is not subject to a financing
condition. In March 2021, our stockholders approved the proposal to adopt the
Merger Agreement and approve the transactions contemplated thereby including the
Mergers. The Mergers are anticipated to close in the second quarter of our
fiscal year 2022 (the quarter ending July 31, 2021), subject to receipt of
required regulatory approvals, and other customary closing conditions. We cannot
predict with certainty, however, whether and when all of the required closing
conditions will be satisfied or if the Mergers will close.
The Merger Agreement contains certain customary termination rights for us and
Salesforce, including if the First Merger is not consummated by August 1, 2021,
subject to two extensions of up to three months each in order to obtain required
regulatory approvals. If the Merger Agreement is terminated under certain
specified circumstances, including (i) a termination by us to enter into a
superior proposal, (ii) a termination by Salesforce following a change or
withdrawal of the Company's board of directors' recommendation of the Mergers to
our stockholders, or (iii) a termination by Salesforce as a result of a material
breach of our non-solicitation obligations under the Merger Agreement, then we
will be obligated to pay to Salesforce a termination fee equal to $900.0 million
in cash.
As part of Salesforce after the completion of the Mergers, we expect our company
will be positioned to scale and further our mission. Following the completion of
the Mergers, Slack will become an operating unit of Salesforce and continue to
be led by our Chief Executive Officer, Stewart Butterfield, driving forward a
continued focus on our mission, customers, users, and community. See the section
titled "Risk Factors-Risks Related to our Proposed Transaction with Salesforce"
included under Part II, Item 1A of this Quarterly Report on Form 10-Q for more
information regarding the risks associated with the Mergers.
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The foregoing summary of the Merger Agreement and the transactions contemplated
thereby does not purport to be complete and is subject to, and qualified in its
entirety by, the full text of the Merger Agreement, which is filed as Exhibit
2.1 of our Current Report on Form 8-K filed on December 1, 2020 and incorporated
by reference herein.
                                COVID-19 Update
In March 2020, the World Health Organization declared COVID-19 a global
pandemic. This contagious disease outbreak, which has continued to spread, and
the related public health measures, including orders to shelter-in-place, travel
restrictions, and mandated business closures, have adversely affected
workforces, organizations, customers, economies, and financial markets globally,
leading to an economic downturn and increased market volatility. It has also
disrupted the normal operations of many businesses, including ours.
We have experienced volatility in customer demand and buying habits due to the
COVID-19 pandemic, including an increase in net new Paid Customers, but also an
increase in paid customer churn and a decrease in expansion within existing paid
customers. We expect these paid customer churn and expansion trends to continue
due to the ongoing effects of the COVID-19 pandemic. We define paid customer
churn as paid customers reducing the number of users within their organizations
or electing not to renew their paid subscriptions. The full extent of the impact
of the COVID-19 pandemic on our operational and financial performance will
continue to depend on certain developments, including the duration and spread of
the outbreak, distribution and public acceptance of treatments and vaccines, the
pace of reopening, impact on our customers and our sales cycles, impact on our
business operations, impact on our customer, employee or industry events, all of
which are uncertain and cannot be predicted.
The COVID-19 pandemic and its adverse effects have been more prevalent in the
locations where we, our customers, suppliers, and third-party business partners
conduct business. This outbreak, as well as intensified measures undertaken to
contain the spread of COVID-19, have decreased IT spending for many
organizations, adversely affected demand for Slack including attrition rates,
and inhibited the ability of our salespeople to travel to potential customers
and of our customer success team to conduct in-person trainings and consulting
work. Additionally, the COVID-19 pandemic has negatively impacted spending from
certain new and existing customers, increased sales cycle times, negatively
impacted collections of accounts receivable from certain customers, caused
certain of our paid customers to file for bankruptcy protection or go out of
business, and harmed our business, results of operations, and financial
condition. We expect these negative impacts will continue due to the ongoing
effects of the COVID-19 pandemic, although we cannot predict the duration or
severity of such impacts. In addition, to prepare for potential surges in
demand, we have incurred, and may continue to incur, additional costs and make
additional investments in order to meet the demands of increased customer usage
of Slack and additional product development efforts during this time may put
additional pressure on our technical infrastructure. The broader implications of
COVID-19 on our results of operations and overall financial performance remain
uncertain.
The COVID-19 pandemic has resulted in, and any prolonged economic slowdowns may
continue to result in, paid customers on Slack requesting to renegotiate
existing contracts on less advantageous terms to us than those currently in
place, defaulting on payments due on existing contracts, not renewing at the end
of the contract term, or choosing to renew with a smaller commitment than
previous contracts. For example, in an effort to assist both new and existing
paid customers facing challenges due to the economic impact of the COVID-19
pandemic, we have entered into, and expect to continue to enter into, more
custom contracts and billing arrangements with new and existing paid customers,
which may be less advantageous to us than our standard term contracts. These
arrangements have included provisions such as the ability to defer payments, to
pay in installments or over longer time periods, and other collection
flexibility. We have also granted, and may in the future grant, billing
concessions to existing paid customers. We do not expect these billing
arrangements to have a significant impact on our future revenue, but they will
negatively impact our future Calculated Billings and Free Cash Flow.
The COVID-19 pandemic also presents challenges as our entire workforce is
currently working remotely and shifting to assisting new and existing customers
who are also generally working remotely. All of our currently planned customer,
employee, and industry events have been shifted to virtual-only experiences, and
we may deem it advisable to similarly alter, postpone, or cancel entirely,
additional customer, partner, employee, or industry events in the future.
Furthermore, in June 2020, we announced that we would allow many of our
employees to work remotely on a permanent basis. We have a limited history of
having a remote workforce and the long-term impact on, and the resulting types
of continuing investments for, our employee base is uncertain. In addition, we
may incur increased workforce costs, including costs associated with
implementing additional personnel and workplace safety protocols, the accrual of
unused paid time off, and workplace or labor claims and disputes related to
COVID-19.
While we have developed and continue to develop plans to help mitigate the
potential negative impact of the outbreak on our business, these efforts may not
be effective and a protracted economic downturn will likely limit the
effectiveness of our mitigation efforts. Due to our subscription-based business
model, the effect of the COVID-19 pandemic may not be fully
                                       20
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reflected in our results of operations until future periods, if at all. We are
continuing to understand the long-term net effect and anticipated future
magnitude of the above factors on our results for future periods and such
forecasts are inherently uncertain. See Part II, Item 1A, "Risk Factors" for
further discussion of the possible impact of the COVID-19 pandemic on our
business, financial condition, and results of operations.
                              Key Business Metrics
We review the following key business metrics to measure our performance,
identify trends, formulate financial projections, and make strategic decisions.
We are not aware of any uniform standards for calculating these key metrics,
which may hinder comparability with other companies who may calculate
similarly-titled metrics in a different way.
We define an organization as a separate entity, such as a company, educational
or government institution, or distinct business unit of a company, that is on a
subscription plan, whether free or paid. Once an organization has three or more
users on a paid subscription plan, we count them as a Paid Customer, and when
disclosing the number of Paid Customers, we round down to the nearest thousand.
Paid Customers
We believe that the growth in our Paid Customer base reflects our value
proposition and positions us for future growth as our Paid Customers often
expand their adoption over time and Paid Customers increase awareness of Slack,
which leads to organic adoption by new organizations. Our Paid Customers base
has expanded through increasing awareness of Slack, further developing our
go-to-market strategy, continuing to build features tuned to different industry
needs, and increasing usage of Slack Connect. Our Paid Customer base includes
organizations of all sizes across a wide range of industries.
As of April 30, 2021 and 2020, we had approximately 169,000 and 122,000 Paid
Customers, respectively.
Paid Customers >$100,000
We focus on growing the number of Paid Customers >$100,000 as a measure of our
ability to scale with organizations on Slack and attract larger organizations to
Slack. We believe that our ability to increase the number of Paid Customers
>$100,000 is a key indicator for important components of the growth of our
business, including our success in expanding the number of users within a Paid
Customer, providing the functionality required by large organizations and
developing our direct sales force.
We define Paid Customers >$100,000 as those organizations on a paid subscription
plan that had more than $100,000 in annual recurring revenue, or ARR, as of a
period end. ARR is based on monthly recurring revenue, or MRR, for the most
recent month at period end, multiplied by twelve. For Paid Customers that have a
type of subscription agreement where billing is reconciled on a monthly or
quarterly basis based on usage, MRR is calculated by multiplying the monthly
subscription price, inclusive of discounts, by the number of active
subscriptions as of the month end. For Paid Customers that have a type of
subscription agreement where billing is fixed and independent of usage, MRR is
calculated by multiplying the monthly subscription price, inclusive of
discounts, by the number of purchased subscriptions.
As of April 30, 2021, we had 1,285 Paid Customers >$100,000, who contributed
approximately 51% of revenue for the three months then ended. As of April 30,
2020, we had 963 Paid Customers >$100,000, who contributed approximately 49% of
revenue for the three months then ended.
Net Dollar Retention Rate
We disclose Net Dollar Retention Rate as a supplemental measure of our organic
revenue growth. We believe Net Dollar Retention Rate is an important metric that
provides insight into the long-term value of our subscription agreements and our
ability to retain, and grow revenue from, our Paid Customers.
We calculate Net Dollar Retention Rate as of a period end by starting with the
MRR from all Paid Customers as of twelve months prior to such period end, or
Prior Period MRR. We then calculate the MRR from these same Paid Customers as of
the current period end, or Current Period MRR. Current Period MRR includes
expansion within Paid Customers and is net of contraction or attrition over the
trailing twelve months, but excludes revenue from new Paid Customers in the
current period, including those organizations that were only on Free
subscription plans in the prior period and converted to paid subscription plans
during the current period. We then divide the total Current Period MRR by the
total Prior Period MRR to arrive at our Net Dollar Retention Rate.
As of April 30, 2021 and 2020, our Net Dollar Retention Rate was 122% and 132%,
respectively. Our Net Dollar Retention Rate has declined year over year as our
base of revenue has grown and our penetration within existing, long-term Paid
Customers has increased. Our Net Dollar Retention Rate will fluctuate in future
periods due to a number of factors, including
                                       21
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the growing level of our revenue base, the level of penetration within our Paid
Customer base, expansion of products and features, and our ability to retain our
Paid Customers.
                          Non-GAAP Financial Measures
In addition to our results determined in accordance with U.S. generally accepted
accounting principles, or GAAP, we believe the below non-GAAP measures are
useful in evaluating our operating performance. We use the below non-GAAP
financial information, collectively, to evaluate our ongoing operations and for
internal planning and forecasting purposes. We believe that non-GAAP financial
information, when taken collectively, may be helpful to investors because it
provides consistency and comparability with past financial performance, and
assists in comparisons with other companies, some of which use similar non-GAAP
financial information to supplement their GAAP results. The non-GAAP financial
information is presented for supplemental informational purposes only, and
should not be considered a substitute for financial information presented in
accordance with GAAP, and may be different from similarly-titled non-GAAP
measures used by other companies. A reconciliation is provided below for each
non-GAAP financial measure to the most directly comparable financial measure
stated in accordance with GAAP. Investors are encouraged to review the related
GAAP financial measures and the reconciliation of these non-GAAP financial
measures to their most directly comparable GAAP financial measures.
                               Three Months Ended April 30,
                                   2021                   2020
                                      (In thousands)
Calculated Billings     $       278,523                $ 206,009
Free Cash Flow          $        62,705                $   3,683


Calculated Billings
Calculated Billings consists of our revenue plus the change in our deferred
revenue in a given period. The Calculated Billings metric is intended to reflect
sales to new paid customers plus renewals and additional sales to existing paid
customers. Our management uses Calculated Billings to measure and monitor our
sales growth because we generally bill our paid customers at the time of sale,
but may recognize a portion of the related revenue ratably over time. For
subscriptions, we typically invoice our paid customers at the beginning of the
term, in annual or monthly installments and, from time to time, in multi-year
installments. Only amounts invoiced to a paid customer in a given period are
included in Calculated Billings. While we believe that Calculated Billings
provides valuable insight into the cash that will be generated from sales of our
subscriptions, this metric may vary from period-to-period for a number of
reasons, and therefore has a number of limitations as a quarter-over-quarter or
year-over-year comparative measure. These reasons include, but are not limited
to, the following: (i) a variety of contractual terms could result in some
periods having a higher proportion of annual subscriptions than other periods,
(ii) as we focus on sales to large organizations, the lengthening of our sales
cycle, and the variability in the timing of the execution of these larger
transactions, (iii) fluctuations in payment terms affecting the billings
recognized in a particular period, and (iv) seasonality in our billings, with a
greater proportion of our billings occurring in our fourth quarter, following
typical enterprise software buying patterns. Because of these and other
limitations, you should consider Calculated Billings along with revenue and our
other GAAP financial results.
The following table presents a reconciliation of revenue, the most directly
comparable financial measure calculated in accordance with GAAP, to Calculated
Billings, for each of the periods presented:
                                                                     Three Months Ended April 30,
                                                                        2021                  2020
                                                                            (In thousands)
Revenue                                                          $       273,357          $ 201,650
Add: Total deferred revenue, end of period                               515,771            381,073
Less: Total deferred revenue, beginning of period                       (510,605)          (376,714)
Calculated Billings                                              $       278,523          $ 206,009


Free Cash Flow
Free Cash Flow is a non-GAAP financial measure that we calculate as net cash
provided by operating activities less purchases of property and equipment. We
believe that Free Cash Flow is a useful indicator of liquidity that provides
information to management and investors about the amount of cash generated from
our core operations that, after the purchases of property and equipment, can be
used for strategic initiatives, including investing in our business, making
strategic acquisitions, and strengthening our balance sheet. Free Cash Flow has
limitations as an analytical tool, and it should not be
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considered in isolation or as a substitute for analysis of other GAAP financial
measures, such as net cash provided by operating activities. Some of the
limitations of Free Cash Flow are that this metric does not reflect our future
contractual commitments and may be calculated differently by other companies in
our industry, limiting its usefulness as a comparative measure. We expect our
Free Cash Flow to fluctuate in future periods as we invest in our business to
support our plans for growth. These activities, along with certain increased
operating expenses as described below, may result in a decrease in Free Cash
Flow as a percentage of revenue in future periods.
The following table summarizes our cash flows for the periods presented and
provides a reconciliation of net cash from operating activities, the most
directly comparable financial measure calculated in accordance with GAAP, to
Free Cash Flow, for each of the periods presented:
                                                                      Three Months Ended April 30,
                                                                         2021                  2020
                                                                             (In thousands)
Net cash provided by operating activities                         $        62,755          $   8,729
Purchases of property and equipment                                           (50)            (5,046)
Free Cash Flow                                                    $        62,705          $   3,683
Net cash provided by (used in) investing activities               $       190,198          $ (35,464)
Net cash provided by (used in) financing activities               $        (1,661)         $ 755,961



                    Key Components of Results of Operations
Revenue
We generate substantially all of our revenue through sales of subscriptions of
Slack to organizations. We recognize subscription revenue on a straight-line
basis over the term of the contract subscription period beginning on the date
access to Slack is granted, provided all other revenue recognition criteria have
been met. Our subscriptions are generally non-cancellable and typically do not
contain general rights of return. We maintain a fair billing policy, under which
certain organizations on a paid subscription plan are entitled to credit if they
have not used the entirety of the contracted number of users for which they have
paid during the contractual term of the arrangement. These credits, accounted
for as a part of deferred revenue, may be carried over to offset future billings
and are not refundable for cash. On occasion, we also provide professional
services to organizations on Slack. Professional services revenue has not been
material to date.
Overhead Allocation and Employee Compensation Costs
We allocate shared costs, such as facilities (including lease, utilities, and
depreciation on equipment shared by all departments) and information technology,
or IT, costs to all departments based on headcount. As such, allocated shared
costs are reflected in cost of revenue and each operating expense category.
Employee compensation costs, or personnel costs, include salaries, bonuses,
benefits, and stock-based compensation for cost of revenue and each operating
expense category and also includes sales commissions for sales and marketing.
Cost of Revenue
Cost of revenue consists primarily of expenses related to hosting Slack and
providing ongoing customer support for paid customers. These expenses include
employee compensation (including stock-based compensation) and other
employee-related expenses for customer experience, professional services, and
technical operations staff, payments to outside service providers, third-party
hosting costs, payment processing fees, and amortization expense associated with
internally-developed and purchased technology. We expect our cost of revenue to
continue to increase in absolute dollar amounts as we grow our business and
revenue.
Operating Expenses
Research and Development. Research and development expenses consist primarily of
personnel costs and allocated overhead. Our research and development efforts
focus on maintaining and enhancing existing functionality of, and adding new
functionality to, Slack. We plan to increase the dollar amount of our investment
in research and development for the foreseeable future as we focus on developing
new features and enhancements. We expect, however, that our research and
development expenses will decrease as a percentage of our revenue over time as
our revenue grows, although the percentage may fluctuate from period to period
depending on fluctuations in the timing and extent of our research and
development expenses.
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Sales and Marketing. Sales and marketing expenses consist primarily of personnel
costs, expenses associated with our marketing and business development programs,
including Frontiers, our annual user conference, Spec, our annual developer
conference, and other events, sponsorships, and Slack conferences. Sales and
marketing expenses also include allocated third-party hosting costs as well as
customer experience and technical operations employee overhead costs for users
of our free version of Slack. Sales commissions that are directly related to
acquiring sales contracts, as well as associated payroll taxes, are deferred
upon execution of a non-cancellable contract with an organization, and
subsequently amortized to sales and marketing expense over the estimated period
of benefit, typically four years. We plan to increase the dollar amount of our
investment in sales and marketing for the foreseeable future, primarily for
increased headcount for our direct sales organization and investment in brand
and product marketing efforts. We expect to continue to incur sales and
marketing expenses to the extent that we continue to see a high-growth market
opportunity to support the growth of our business. If the growth in our business
lessens over time, we plan to decrease the rate of growth in our sales and
marketing expenses. We expect, however, that our sales and marketing expenses
will decrease as a percentage of our revenue over time as our revenue grows,
although the percentage may fluctuate from period to period depending on
fluctuations in the timing and extent of our sales and marketing expenses.
General and Administrative. General and administrative expenses consist
primarily of personnel costs for our finance and accounting, legal, human
resources, and other administrative teams as well as for certain executives and
professional fees, including audit, legal, and recruiting services. We expect
that our general and administrative expenses will decrease as a percentage of
our revenues over time, although the percentage may fluctuate from period to
period depending on fluctuations in our revenue and the timing and extent of our
general and administrative expenses.
Interest Expense
After our issuance of 0.50% convertible senior notes due 2025, or the Notes, in
an aggregate principal amount of $862.5 million in April 2020, interest expense
consists primarily of contractual interest expense and amortization of the
discount and debt issuance costs on our Notes.
Interest Income and Other Income, Net
Interest income and other income, net consists primarily of interest income
earned on our cash, cash equivalents, and marketable securities, change in fair
value of our strategic investments and gains or losses on foreign currency
exchange.
Provision for Income Taxes
Provision for income taxes consists primarily of U.S. federal, state income
taxes, and income taxes in certain foreign jurisdictions in which we conduct
business. Since inception, we have incurred operating losses and, accordingly,
have not recorded a provision for income taxes for any of the periods presented
other than provisions for foreign income tax.
                             Results of Operations

The following tables set forth our results of operations for the periods presented in dollars and as a percentage of our revenue:

Three Months Ended April 30,


                                                                            2021                  2020
                                                                                (In thousands)
Revenue                                                              $       273,357          $ 201,650
Cost of revenue(1)                                                            39,237             25,602
Gross profit                                                                 234,120            176,048
Operating expenses:
Research and development(1)                                                  103,602             91,225
Sales and marketing(1)                                                       123,947            110,320
General and administrative(1)                                                 61,848             50,654
Total operating expenses                                                     289,397            252,199
Loss from operations                                                         (55,277)           (76,151)
Interest expense                                                             (12,029)            (2,842)
Interest income and other income, net                                         40,426              4,708
Loss before income taxes                                                     (26,880)           (74,285)
Provision for income taxes                                                     1,065                142
Net loss                                                                     (27,945)           (74,427)
Net income attributable to noncontrolling interest(2)                              -                784
Net loss attributable to Slack                                       $      

(27,945) $ (75,211)

_______________

(1)Includes stock-based compensation as follows:


                                        Three Months Ended April 30,
                                             2021                    2020
                                               (In thousands)
Cost of revenue                  $         2,551                  $  2,354
Research and development                  28,809                    27,419
Sales and marketing                       13,939                    14,075
General and administrative                13,718                     9,863
Total stock-based compensation   $        59,017                  $ 53,711


(2)Our condensed consolidated financial statements include our majority-owned
subsidiary, Slack Fund. The ownership interest of minority investors in Slack
Fund was recorded as a noncontrolling interest. In March 2021, we purchased all
the outstanding interest in Slack Fund from the minority investors.
                                                                       Three Months Ended April 30,
                                                                        2021                  2020
Revenue                                                                     100  %                100  %
Cost of revenue                                                              14                    13
Gross profit                                                                 86                    87
Operating expenses:
Research and development                                                     38                    45
Sales and marketing                                                          45                    55
General and administrative                                                   23                    25
Total operating expenses                                                    106                   125
Loss from operations                                                        (20)                  (38)
Interest expense                                                             (4)                   (1)
Interest income and other income, net                                        14                     2
Loss before income taxes                                                    (10)                  (37)
Provision for income taxes                                                    -                     -
Net loss                                                                    (10)                  (37)
Net income attributable to noncontrolling interest                            -                     -
Net loss attributable to Slack                                              (10) %                (37) %


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Comparison of the Three Months Ended April 30, 2021 and 2020 Revenue and Cost of Revenue


                         Three Months Ended April 30,
                             2021                   2020         $ Change      % Change
                                (In thousands)
Revenue           $       273,357                $ 201,650      $ 71,707           36  %
Cost of revenue            39,237                   25,602        13,635           53
Gross profit      $       234,120                $ 176,048      $ 58,072           33


Revenue increased $71.7 million, or 36%, for the three months ended April 30,
2021 compared to the three months ended April 30, 2020. The increase in revenue
was primarily due to expansion within our existing Paid Customers, as reflected
by our Net Dollar Retention Rate of 122% as of April 30, 2021, and the addition
of new Paid Customers, as our number of Paid Customers grew from 122,000 as of
April 30, 2020 to 169,000 as of April 30, 2021.
Cost of revenue increased $13.6 million, or 53%, for the three months ended
April 30, 2021 compared to the three months ended April 30, 2020. The increase
was primarily due to an $8.2 million increase in third-party hosting fees as the
number of organizations on and, users of, Slack in general increased, a $3.4
million increase in personnel and related costs due to additional headcount to
support the growth in organizations on Slack, and a $1.3 million increase in
credit card payment processing fees as the volume of sales transactions
increased.
Operating Expenses
                                    Three Months Ended April 30,
                                        2021                   2020         $ Change      % Change
                                           (In thousands)
Operating expenses:
Research and development     $       103,602                $  91,225      $ 12,377           14  %
Sales and marketing                  123,947                  110,320        13,627           12
General and administrative            61,848                   50,654        11,194           22
Total operating expenses     $       289,397                $ 252,199      $ 37,198           15


Research and Development
Research and development expenses increased $12.4 million, or 14%, for the three
months ended April 30, 2021 compared to the three months ended April 30, 2020.
The increase was primarily due to a $10.2 million increase in personnel costs
related to increased headcount, a $1.5 million increase stock-based compensation
and related employer payroll taxes, and a $1.4 million increase in facility- and
IT-related overhead costs to support our headcount growth.
Sales and Marketing
Sales and marketing expenses increased $13.6 million, or 12%, for the three
months ended April 30, 2021 compared to the three months ended April 30, 2020.
The increase was primarily due to a $16.4 million increase in personnel costs,
which include customer experience and infrastructure employee costs for users of
our free version, a $5.6 million increase in third-party hosting costs for users
on a Free subscription plan of Slack, primarily due to continuing growth in our
user base, and a $0.7 million increase in facility- and IT-related overhead
costs to support our headcount growth. These increases were partially offset by
a $6.2 million decrease in marketing expenses due to less spending on brand and
advertising, and a $3.0 million decrease in travel costs due to COVID-19 travel
restrictions.
General and Administrative
General and administrative expenses increased $11.2 million, or 22%, for the
three months ended April 30, 2021 compared to the three months ended April 30,
2020. The increase was primarily due to a $6.7 million increase in legal fees
including $3.0 million transaction expenses associated with the proposed Mergers
with Salesforce, a $4.0 million increase in stock-based compensation and related
employer payroll taxes, and a $1.8 million increase in personnel costs related
to increases in our administrative, finance and accounting, legal, IT, and human
resources headcount. These increases were partially offset by a $1.0 million
decrease in corporate expenses mainly related to charitable contributions and
corporate events.
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Interest Expense
Interest expense increased by $9.2 million for the three months ended April 30,
2021 compared to the three months ended April 30, 2020 due to the amortization
of debt discount and issuance costs for the convertible senior note issued in
April 2020.
Interest Income and Other Income, Net
Interest income and other income, net was $40.4 million for the three months
ended April 30, 2021, an increase of $35.7 million from the three months ended
April 30, 2020. The increase was primarily driven by a net increase in realized
and unrealized gains from our strategic investments of $38.3 million, partially
offset by a decrease of interest income of $2.7 million due primarily to a
decrease in interest rates.
Provision for Income Taxes
The provision for income taxes was $1.1 million for the three months ended
April 30, 2021, an increase of $0.9 million from the three months ended
April 30, 2020, primarily related to increase in tax from operations in foreign
jurisdictions.
                        Liquidity and Capital Resources
As of April 30, 2021, our principal sources of liquidity were cash, cash
equivalents, and restricted cash of $1.4 billion and marketable securities of
$308.5 million. Cash and cash equivalents are comprised of bank deposits and
money market funds. Restricted cash consists of cash deposited with financial
institutions as collateral for our obligations under the facility leases in San
Francisco, California and Denver, Colorado. As of April 30, 2021, our restricted
cash totaled $38.5 million. Marketable securities are comprised of certificates
of deposit, U.S. agency securities, U.S. government securities, and corporate
bonds. As of April 30, 2021, 94% of all cash and cash equivalents are held in
the United States. Since our inception, we have financed our operations
primarily through proceeds from the issuance of our convertible preferred stock,
convertible senior notes, common stock, and cash generated from the sale of our
subscriptions.
We have generated significant losses from operations and negative cash flows
from operating activities in the past as reflected in our accumulated deficit of
$1.6 billion as of April 30, 2021. We expect to continue to incur operating
losses for the foreseeable future due to the investments that we intend to make
in our business and, as a result, we may require additional capital resources to
grow our business.
In April 2020, we completed our private offering of the Notes and received
aggregate proceeds of $862.5 million, before deducting issuance costs of $21.2
million. In connection with the Notes, we entered into privately negotiated
capped call transactions with certain counterparties, or the Capped Calls, with
respect to our Class A common stock. We used an aggregate amount of
$105.6 million of the net proceeds from the sale of the Notes to purchase the
Capped Calls.
In May 2019, we entered into a $215.0 million revolving credit and guaranty
agreement with a syndicate of financial institutions. The revolving credit
facility has an accordion option, which, if exercised, would allow us to
increase the aggregate commitments by up to the greater of $200.0 million and
100% of the consolidated adjusted EBITDA of us and our subsidiaries, plus an
unlimited amount subject to satisfaction of certain leverage ratio based
compliance tests after giving effect to the exercise, in each case subject to
obtaining additional lender commitments and satisfying certain conditions.
Pursuant to the terms of the revolving credit facility, we may issue letters of
credit under the revolving credit facility, which reduce the total amount
available for borrowing under such facility. As of April 30, 2021, we had no
amounts or letters of credit issued and outstanding under the revolving credit
facility. Our total available borrowing capacity under the revolving credit
facility was $215.0 million as of April 30, 2021.
We believe that current cash, cash equivalents, marketable securities, and
available borrowing capacity under the revolving credit facility will be
sufficient to fund our operations for at least the next 12 months. Our future
capital requirements, however, will depend on many factors, including our
subscription growth rate, our Net Dollar Retention Rate, the timing and extent
of spending to support our research and development efforts, the expansion of
sales and marketing activities, the introduction of new and enhanced products
and features, particularly for large organizations and for networks between
organizations and the continuing market adoption of Slack. We may in the future
enter into arrangements to acquire or invest in complementary businesses,
services, and technologies, including intellectual property rights. In the event
that additional financing is required from outside sources, we may seek to raise
additional funds at any time through equity, equity-linked arrangements, and
debt. If we are unable to raise additional capital when desired and at
reasonable rates, our business, results of operations, and financial condition
would be adversely affected. See the section titled "Risk Factors-Risks Related
to Our Business-Our failure to raise additional capital or generate cash flows
necessary to expand our operations and invest in new technologies and customer
acquisition efforts in the future could reduce our ability to compete
successfully and harm our results of operations."
On December 1, 2020 we entered into the Merger Agreement with Salesforce. We
have agreed to various covenants and
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agreements, including, among others, agreements to conduct our business in the
ordinary course during the period between the execution of the Merger Agreement
and the effective time of the Mergers. Outside of certain limited exceptions, we
may not take, authorize, commit, resolve, or agree to do certain actions without
Salesforce's consent, including:
•acquiring businesses and disposing of significant assets;
•incurring expenditures above specified thresholds;
•issuing additional debt facilities; and
•repurchasing shares of our outstanding common stock.
We do not believe these restrictions will prevent us from meeting our ongoing
costs of operations, working capital needs, or capital expenditure requirements.
Cash Flows
The following table summarizes our cash flows for the periods indicated:
                                                                      Three Months Ended April 30,
                                                                         2021                  2020
                                                                             (In thousands)
Net cash provided by operating activities                         $        62,755          $   8,729
Net cash provided by (used in) investing activities                       190,198            (35,464)
Net cash provided by (used in) financing activities                        (1,661)           755,961

Net increase in cash, cash equivalents and restricted cash $ 251,292 $ 729,226




Cash Provided by Operating Activities
Our largest source of operating cash is cash collections from organizations on a
paid subscription plan. Our primary uses of cash from operating activities are
for employee-related expenditures, sales and marketing expenses, and third-party
hosting costs. Historically, we have generated negative cash flows from
operating activities and have supplemented working capital requirements through
net proceeds from the private sale of equity securities.
During the three months ended April 30, 2021, operating activities provided
$62.8 million in cash. The primary factors affecting our operating cash flows
during this period were our net loss of $27.9 million impacted by $54.5
million non-cash charges and $36.2 million of cash provided from changes in our
operating assets and liabilities. The non-cash charges primarily consisted of
$59.0 million in stock-based compensation, $10.8 million of amortization of debt
discount and issuance costs, $10.3 million of non-cash operating lease expenses,
$7.5 million of depreciation and amortization, and $5.1 million of amortization
of deferred contract acquisition costs, partially offset by a $39.9 million net
gain as a result of the change in fair value of our strategic investments. The
cash provided from changes in our operating assets and liabilities was primarily
due to a $95.6 million decrease in accounts receivable, reflecting an increase
in collections, a $5.2 million increase in deferred revenue due to additional
billings with new and existing Paid Customers, and a $2.0 million increase in
accounts payable due to the timing of payments. These amounts were partially
offset by a $51.6 million decrease in accrued compensation and benefits mainly
due to the payment of our corporate bonus to employees, $8.3 million of
operating lease payments, a $4.1 million increase in prepaid expenses and other
assets, and a $2.6 million decrease in other liabilities.
During the three months ended April 30, 2020, operating activities provided $8.7
million in cash. The primary factors affecting our operating cash flows during
this period were our net loss of $74.4 million, impacted by $73.8
million non-cash charges and $9.4 million of cash provided from changes in our
operating assets and liabilities. The non-cash charges primarily consisted of
$53.7 million in stock-based compensation, $8.7 million of non-cash operating
lease expenses, $6.7 million of depreciation and amortization, $3.1 million of
amortization of deferred contract acquisition costs, and $2.4 million of
amortization of debt discount and issuance cost, partially offset by a $1.6
million gain as a result of the change in fair value of our strategic
investments. The cash provided from changes in our operating assets and
liabilities was primarily due to a a $39.5 million decrease in accounts
receivable, reflecting an increase in collections and seasonal decrease in
billings and a $4.4 million increase in deferred revenue due to additional
billings with new and existing paid customers. These amounts were partially
offset by a $13.3 million decrease in accrued compensation and benefits mainly
due to the payment of our corporate bonus to employees, $8.7 million of
operating lease payments, $6.6 million increase in prepaid expenses and other
assets, a $3.7 million decrease in accounts payable due to the timing of
payments, and a $2.1 million decrease in accrued expenses and other liabilities.
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Cash Provided by (Used in) Investing Activities
Net cash provided by investing activities during the three months ended
April 30, 2021 was $190.2 million, which was primarily driven by maturities and
sales of marketable securities of $196.2 million, partially offset by purchase
of strategic investments of $6.0 million.
Net cash used in investing activities during the three months ended April 30,
2020 was $35.5 million, which was primarily driven by cash used to purchase
marketable securities of $100.3 million, property and equipment of $5.0 million,
and strategic investments of $4.0 million, partially offset by sales and
maturities of marketable securities of $73.9 million.
Cash Provided by (Used in) Financing Activities
Net cash used in financing activities for the three months ended April 30, 2021
was $1.7 million, primarily driven by purchase of noncontrolling interest of
$22.6 million, partially offset by proceeds from employee purchases of common
stock under the employee stock purchase plan of $20.5 million and exercise of
stock options of $1.3 million
Net cash provided by financing activities for the three months ended April 30,
2020 was $756.0 million, primarily driven by proceeds from the issuance of the
Notes of $842.0 million, net of issuance costs, proceeds from employee purchases
of common stock under the employee stock purchase plan of $16.6 million and
exercise of stock options of $2.9 million, partially offset by a payment for
Capped Calls related to the Notes of $105.6 million.
                    Contractual Obligations and Commitments
Our principal contractual commitments primarily consist of obligations under the
Notes (including principal and coupon interest), operating leases for office
space, and datacenter operations. For additional information of the Notes,
operating lease obligations, and hosting commitments, refer to Note 6, Note 5,
and Note 7 of the notes to our unaudited condensed consolidated financial
statements included elsewhere in this Quarterly Report on Form 10-Q.
There has been no material change in our other contractual obligations primarily
related to IT operations, sales and marketing activities, and acquisition
related obligations in the ordinary course of business since our fiscal year
ended January 31, 2021. See our Annual Report on Form 10-K filed with the SEC on
March 19, 2021 for additional information regarding our contractual obligations
and commitments.
                         Off-Balance Sheet Arrangements

As of April 30, 2021, we did not have any relationships with unconsolidated entities or financial partnerships, such as structured finance or special purpose entities that were established for the purpose of facilitating off-balance sheet arrangements or other purposes.


                   Critical Accounting Policies and Estimates
Critical accounting policies and estimates are those accounting policies and
estimates that are both the most important to the portrayal of our net assets
and results of operations and require the most difficult, subjective or complex
judgments, often as a result of the need to make estimates about the effect of
matters that are inherently uncertain. These estimates are developed based on
historical experience and various other assumptions that we believe to be
reasonable under the circumstances. Critical accounting estimates are accounting
estimates where the nature of the estimates are material due to the levels of
subjectivity and judgment necessary to account for highly uncertain matters or
the susceptibility of such matters to change and the impact of the estimates on
financial condition or operating performance is material.
Our significant accounting policies are discussed in "Notes to Consolidated
Financial Statements - Note 1. Description of Business and Summary of
Significant Accounting Policies" in our Annual Report on Form 10-K filed with
the SEC on March 19, 2021. There have been no material changes to our critical
accounting policies and estimates during the three months ended April 30, 2021.
                        Recent Accounting Pronouncements

See Note 1 of the notes to our condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q for more information.


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