The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our unaudited consolidated financial statements and related notes included elsewhere in this Quarterly Report on Form 10-Q, or Quarterly Report, and our audited consolidated financial statements and related notes for the year ended December 31, 2020 included in our Annual Report on Form 10-K, or Annual Report. Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report, including information with respect to our plans and strategy for our business, includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that involve risks and uncertainties. As a result of many factors, including those factors set forth in the risks identified in Part II-Item 1A "Risk Factors" section of this Quarterly Report and our other filings with the Securities and Exchange Commission, or SEC, our actual results could differ materially from the results, performance or achievements expressed in or implied by these forward-looking statements.

Overview

We are a biopharmaceutical company focused on discovering, acquiring, developing and commercializing therapeutic medicines for patients suffering from debilitating diseases with significant unmet medical need. Kiniksa's portfolio of assets, ARCALYST® (rilonacept), mavrilimumab, vixarelimab and KPL-404, are based on strong biologic rationale or validated mechanisms, target underserved conditions, and offer the potential for differentiation. These assets are designed to modulate immunological pathways across a spectrum of diseases.

ARCALYST is an interleukin-1? and interleukin-1? cytokine trap. We received U.S. Food and Drug Administration, or FDA, approval of ARCALYST for the treatment of recurrent pericarditis and reduction in risk of recurrence in adults and children 12 years and older in March, 2021. Recurrent pericarditis is a painful inflammatory cardiovascular disease with an estimated U.S. prevalent population of approximately 40,000 patients seeking and receiving medical treatment. ARCALYST is commercially available through a distribution network comprised of several specialty pharmacies, which provide access across the United States. ARCALYST is also approved in the United States for the treatment of Cryopyrin-Associated Periodic Syndromes, or CAPS, specifically Familial Cold Autoinflammatory Syndrome and Muckle-Wells Syndrome in adults and children 12 years and older, and the maintenance of remission in Deficiency of Interleukin-1 Receptor Antagonist, or DIRA, in adults and children weighing 10 kg or more. We are responsible for sales and distribution of ARCALYST in all approved indications in the United States. Our license to ARCALYST includes worldwide rights, excluding the Middle East and North Africa, for all applications other than those in oncology and local administration to the eye or ear. We will evenly split profits on sales of ARCALYST with Regeneron Pharmaceuticals, Inc.("Regeneron"), where profits are determined after deducting certain commercialization expenses, subject to specified limits, from ARCALYST sales.

Mavrilimumab is an investigational monoclonal antibody inhibitor targeting granulocyte-macrophage colony stimulating factor receptor alpha, or GM-CSFR?. We are evaluating mavrilimumab for the potential treatment of giant cell arteritis, or GCA, a chronic inflammatory disease of the medium-to-large arteries with an estimated U.S. prevalence of approximately 75,000 to 150,000 patients. We conducted a global, randomized, double-blind, placebo-controlled Phase 2 proof-of-concept clinical trial for the study of mavrilimumab in GCA. The trial achieved both the primary and efficacy endpoint of time-to-first adjudicated GCA flare by Week 26 in all treated patients and the secondary efficacy endpoint of sustained remission at Week 26 in all treated patients with statistical significance. Additionally, while the trial was not powered for individual disease cohorts, there was a consistent trend of efficacy across the new onset and relapsing/refractory cohorts. In September 2020, the FDA granted Orphan Drug designation for mavrilimumab for the treatment of GCA. We are also evaluating mavrilimumab in severe coronavirus 2019 disease, or COVID-19, pneumonia and hyperinflammation (including COVID-19-related acute respiratory distress syndrome, or ARDS). We are currently conducting a global, randomized, double-blind, placebo-controlled adaptive design Phase 2/3 clinical trial of mavrilimumab in severe COVID-19 pneumonia and hyperinflammation. In April 2021, we announced preliminary data from the Phase 2 portion of the trial in non-mechanically-ventilated patients with severe COVID-19 ARDS receiving local standard of care. Non-mechanically ventilated patients treated with mavrilimumab demonstrated a reduction in mechanical ventilation and death at Day 29 pooled across dose levels. The trial achieved its primary efficacy endpoint of the proportion of patients alive and free of mechanical ventilation at Day 29. Mavrilimumab was well-tolerated and



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exhibited a favorable safety profile. In July 2021, we announced additional data from the Phase 2 portion on the Phase 2/3 clinical trial of mavrilimumab in severe COVID-19-related ARDS. Follow-up preliminary overall survival data in non-mechanically ventilated patients at Day 60 and Day 90 were consistent with previously reported Day 29 data. Additionally, Day 29 data from mechanically-ventilated patients did not show a reduction of death. The Phase 3 portion of the Phase 2/3 trial in non-mechanically ventilated patients with severe COVID-19-related ARDS is ongoing and we expect data in the first quarter of 2022. We intend to discontinue enrolling mechanically-ventilated patients in the Phase 3 portion of the trial. Additionally, we are engaged with the FDA and other government agencies to identify pathways to potentially accelerated availability of mavrilimumab as a therapeutic option for severe COVID-19 patients.

Vixarelimab is an investigational monoclonal antibody that is designed to simultaneously inhibit the signaling of the cytokines interleukin 31, or IL-31, and oncostatin M, or OSM, by targeting their common receptor subunit, oncostatin M receptor beta, or OSMR?. We are evaluating vixarelimab for the potential treatment of with prurigo nodularis, a chronic inflammatory skin condition with an estimated U.S. prevalence of approximately 300,000 patients. We are conducting a global, randomized, double-blind, placebo-controlled Phase 2b dose-ranging clinical trial of vixarelimab in prurigo nodularis. The Phase 2b clinical trial is expected to enroll approximately 180 patients experiencing severe pruritus. Patients will be randomized to receive vixarelimab or placebo subcutaneously once-monthly. The primary efficacy endpoint is the percent change from baseline in the weekly-average Worst-Itch Numeric Rating Scale, or WI-NRS, at Week 16. Key secondary efficacy endpoints include the proportion of patients achieving a greater-than-or-equal-to 4-point weekly-average WI-NRS reduction at Week 16 and the proportion of patients achieving a 0/1 score (clear/almost clear) on the prurigo nodularis-investigator's global assessment, or PN-IGA, at Week 16.

KPL-404 is an investigational monoclonal antibody designed to inhibit interaction of CD40 with CD154, or CD40 ligand, signaling, a well-known pathway that plays a critical role in regulating B cell proliferation and T cell activation as well as antibody production. We conducted a randomized, double-blind, placebo-controlled, single-ascending-dose Phase 1 clinical trial of KPL-404 in healthy volunteers to evaluate safety and pharmacokinetics well as receptor occupancy, or RO, and T-cell dependent antibody response, or T-cell Dependent Antibody Response, or TDAR, in these subjects. In May 2021, we reported final data from the trial. KPL-404 showed dose-dependent increases in concentration across cohorts. All dose escalations occurred as per protocol with no dose-limiting safety findings. KPL-404 was well-tolerated, and there were no serious adverse reactions. Subjects dosed with KPL-404 10 mg/kg IV showed full RO through at least Day 71 and complete suppression of TDAR after keyhole limpet hemocyanin, or KLH, challenge and re-challenge through at least Day 57. Subjects dosed with KPL-404 5 mg/kg SC showed full RO through Day 43 and suppression of TDAR after KLH challenge through at least Day 29. Anti-drug antibodies to KPL-404 were suppressed for at least 57 days at 10 mg/kg IV; the suppression of antibody responses to the drug itself is an independent indicator of target engagement and pharmacodynamic effect. We plan to initiate a Phase 2 proof-of-concept clinical trial in rheumatoid arthritis in the fourth quarter of 2021. The trial will evaluate safety and pharmacokinetics of KPL-404 with subcutaneous administration over 12 weeks. Rheumatoid arthritis was selected as a well-characterized autoimmune disease with decades of published clinical data across diverse mechanistic classes, allowing for objective evaluation in established endpoints. The pharmacokinetic lead-in of the planned trial supports characterization of chronic administration of KPL-404 in a patient population and provides optionality to evaluate the therapeutic potential of KPL-404 across a range of other autoimmune diseases with pathologies believed to be mediated by the CD40-CD154 pathway.

Our future success is dependent on our ability to successfully commercialize ARCALYST and to develop, obtain regulatory approval for and successfully commercialize one or more of our current or future product candidates. Upon approval from the FDA of the commercial marketing of ARCALYST in the United States for the treatment of recurrent pericarditis and reduction in risk of recurrence in adults and children 12 years and older in March 2021, we assumed the sales and distribution of ARCALYST for the previously approved indications in the United States and will evenly split profits on sales with Regeneron, where profits are determined after deducting certain commercialization expenses subject to specified limits, from ARCALYST sales. However, as a company we have limited experience obtaining marketing approval for product candidates, commercializing a therapeutic, supporting sales, marketing, and distribution activities and maintaining applicable infrastructure for these activities either directly and/or through agreements with third parties; as a result we may not be successful in commercializing ARCALYST or any future approved product candidates, if any, thus potentially impairing the commercial potential of ARCALYST and our other product candidates to generate any revenue.



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On May 18, 2020, we completed a follow-on offering of 2,760,000 Class A common shares, inclusive of the exercise of the underwriters' overallotment option at a public offering price of $18.25 and a concurrent private placement of 1,600,000 Class A1 common shares at an offering price of $18.25 per share for aggregate gross proceeds of $79.6 million. The aggregate net proceeds to us from the follow-on offering and concurrent private placement, inclusive of the over-allotment option exercise, was $74.5 million after deducting underwriting discounts and commissions, placement agent fees and other offering costs.

On July 24, 2020, we completed a follow-on offering of 5,952,381 Class A common shares, at a public offering price of $21.00 and a concurrent private placement of 1,428,572 Class A1 common shares at an offering price of $21.00 per share for aggregate gross proceeds of $155.0 million. The aggregate net proceeds to us from the follow-on offering and concurrent private placement was $146.0 million after deducting underwriting discounts and commissions, placement agent fees and other offering costs.

We have incurred significant operating losses since inception. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful commercialization of ARCALYST and the development and eventual commercialization of one or more of our current or future product candidates, if approved. Our net losses were $91.0 million and $63.9 million for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, we had an accumulated deficit of $608.5 million. We expect to continue to incur significant operating losses for at least the next several years as we advance our product candidates through preclinical and clinical development and, ultimately, seek regulatory approval. In addition, we expect to continue to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution of ARCALYST. We may also incur expenses in connection with the in-licensing or acquisition of additional product candidates.

As a result, until such time as we can generate significant revenue from product sales of ARCALYST and one or more of our current or future approved product candidates, if ever, we expect to finance our operations through public or private securities offerings, debt financings or other sources, which may include licensing, collaborations or other strategic transactions or arrangements. We may be unable to raise additional funds or enter into such other transactions or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such transactions or arrangements as and when needed, we may have to significantly delay, scale back or discontinue the development and or of one or more of our current or future product candidates or delay our pursuit of potential in-licenses or acquisitions or scale back on commercialization activities for ARCALYST.

Because of the numerous risks and uncertainties associated with product development, including any impact from the COVID-19 pandemic, we are unable to predict the timing or amount of increased expenses or when or if we will be able to achieve or maintain profitability. Even if we are able to successfully commercialize ARCALYST and generate product sales from one or more of our current or future product candidates, if approved, we may not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our operations at planned levels and be forced to reduce or terminate our operations.

As of June 30, 2021, we had cash, cash equivalents and short-term investments of $225.9 million. We believe that our existing cash, cash equivalents and short-term investments will enable us to fund our operating expenses and capital expenditure requirements for at least the next 12 months from the date of issuance of the unaudited consolidated financial statements included in this Quarterly Report. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. See "- Liquidity and Capital Resources." Our future viability beyond that point is dependent on our ability to raise additional capital to finance our operations.

Components of Our Results of Operations

Product revenue, net

Following the FDA approval of ARCALYST in March 2021, the Company began generating product revenue from sales of ARCALYST in April 2021. ARCALYST is sold through a third party logistics provider that distributes



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primarily through a network of authorized specialty pharmacies and specialty distributors ("customers"), which deliver the medication to patients by mail. Our payment terms are between 30 to 35 days.

Net revenue from product sales is recognized at the transaction price when the specialty pharmacy or specialty distributors obtains control of our product, which occurs at a point in time, typically upon shipment of the product from the third party logistics provider.

Our net revenues represent total revenues adjusted for discounts and allowances, including estimated cash discounts, chargebacks, rebates, returns, copay assistance, and specialty pharmacy and distributor fees. These adjustments represent variable consideration under ASC 606 and are estimated using the expected value method and are recorded when revenue is recognized on the sale of the product. These adjustments are established by management as its best estimate based on available information and will be adjusted to reflect known changes in the factors that impact such allowances. Adjustments for variable consideration are determined based on the contractual terms with customers, historical trends, communications with customers and the levels of inventory remaining in the distribution channel, as well as expectations about the market for the product and anticipated introduction of competitive products.





Operating Expenses

Cost of Goods Sold

Cost of goods sold includes production and distribution costs of ARCALYST, and amortization of the regulatory milestone, and other miscellaneous product costs associated with ARCALYST. Cost of goods sold also includes the allocations for the labor and overhead costs associated with the production of ARCALYST associated with quality control, quality assurance, and supply chain activities.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred in connection with the research and development of our product candidates. We expense research and development costs as incurred. These expenses may include:

? expenses incurred to conduct the necessary preclinical studies and clinical

trials required to obtain regulatory approval;

expenses incurred under agreements with CROs that are primarily engaged in the

? oversight and conduct of our clinical trials and CMOs that are primarily

engaged to provide preclinical and clinical drug substance and product for our

research and development programs for our product candidates;

other costs related to acquiring and manufacturing preclinical and clinical

? trial materials, including manufacturing validation batches, as well as

investigative sites and consultants that conduct our clinical trials,

preclinical studies and other scientific development services;

? payments made in cash or equity securities under third-party licensing,

acquisition and other similar agreements;

employee-related expenses, including salaries and benefits, travel and

? share-based compensation expense for employees engaged in research and

development functions;

? costs related to compliance with regulatory requirements; and

? allocated facilities-related costs, depreciation and other expenses, which

include rent and utilities.




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We recognize external development costs based on an evaluation of the progress to completion of specific tasks using information provided to us by our service providers. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. Such amounts are recognized as an expense as the goods are delivered or the related services are performed, or until it is no longer expected that the goods will be delivered or the services rendered.

Our direct research and development expenses are tracked on a program-by-program basis for our product candidates and consist primarily of external costs, such as fees paid to outside consultants, CROs, CMOs and research laboratories in connection with our preclinical development, process development, manufacturing and clinical development activities. Our direct research and development expenses by program also include fees incurred under license, acquisition and other similar agreements. We do not allocate employee costs or facility expenses, including depreciation or other indirect costs, to specific programs because these costs are deployed across multiple programs and, as such, are not separately classified. We use internal resources primarily to conduct our research and discovery activities as well as for managing our preclinical and clinical development, process development and manufacturing clinical and preclinical materials.



The table below summarizes our research and development expenses incurred by
program:


                                                    Three Months Ended        Six Months Ended
                                                        June 30,                 June 30,
                                                     2021         2020        2021        2020

                                                      (in thousands)           (in thousands)
Rilonacept                                        $    3,212    $  5,132    $  6,013    $  9,169
Mavrilimumab                                           7,054       3,335      15,917       5,545
Vixarelimab                                            2,130       1,807       4,786       4,463
KPL-404                                                1,814         775       2,320       2,046

Unallocated research and development expenses 9,735 11,275 23,592 22,002 Total research and development expenses

$   23,945    $ 22,324    $ 52,628    $ 43,225

Research and development activities are central to our business. Product candidates in later stages of clinical development generally have higher costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. As a result, we expect that our research and development expenses will be substantial over the next several years as we conduct our ongoing and planned clinical trials for mavrilimumab, vixarelimab and KPL-404, as well as conduct other preclinical and clinical development including regulatory filings for our current and future product candidates. As a result, our related personnel costs will increase, including costs associated with share-based compensation. We also expect to incur additional expenses related to milestone and royalty payments payable to third parties with whom we have entered into license, acquisition and other similar agreements to acquire the rights to our product candidates.

Upon approval from the FDA of the commercial marketing of ARCALYST in the United States for the treatment of recurrent pericarditis and reduction in risk of recurrence in adults and children 12 years and older in March 2021, we assumed the sales and distribution of ARCALYST for the previously approved indications in the United States. However, as a company we have limited experience obtaining marketing approval our product candidates, commercializing a therapeutic, supporting a sales, marketing, distribution of therapeutic products, and maintaining applicable infrastructure for these activities either directly and/or through agreements with third parties; as a result we may not be successful in commercializing ARCALYST, or any future approved product candidates, if any, thus potentially impairing the commercial potential of ARCALYST and our other product candidates to generate any revenue. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the clinical development of our current or future product candidates or when, if ever, material net cash inflows may commence from ARCALYST or any of our current or future product candidates, if approved. This



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uncertainty is due to the numerous risks and uncertainties associated with product development and commercialization, including the uncertainty of:

the potential impact of the COVID-19 pandemic, including any new variants of

? the virus, on our business, including our preclinical studies, clinical trials

and operations;

? the scope, progress, outcome and costs of our research and preclinical

development activities, clinical trials and other development activities;

? establishing an appropriate safety and efficacy profile with IND enabling and

clinical studies;

? the successful enrollment and initiation, performance and completion of

preclinical studies and clinical trials;

? the timing, receipt and terms of any marketing approvals from applicable

regulatory authorities, including the FDA;

? the extent of any required post-marketing approval commitments to applicable

regulatory authorities;

increasing clinical and commercial manufacturing capabilities or making

arrangements with additional third-party manufacturers to successfully

? manufacture our product candidates at reasonable cost and within approved

specifications for product quality, and in sufficient quantities to meet

patient demand;

? development and timely delivery of clinical-grade and commercial-grade drug

formulations that can be used in our clinical trials and for commercial launch;

maintaining, establishing, and/or expanding a sales, marketing, medical affairs

? and distribution infrastructure to commercialize ARCALYST or any of our current

or future product candidates for which we may obtain marketing approval and

intend to commercialize on our own;

successfully launching commercial sales of ARCALYST or of our current or future

? product candidates, if and when approved, whether alone or in collaboration

with others;

? making milestone or other payments under any current or future license,

acquisition, collaboration or other strategic transaction agreements;

? obtaining, maintaining, defending and enforcing patent claims and other

intellectual property rights;

? significant and changing government regulation; and

? maintaining a continued acceptable safety profile of ARCALYST or our current or

future approved product candidates following approval, if any.

Selling, General and Administrative Expenses

Selling, general and administrative expenses consist primarily of salaries and benefits, travel and share-based compensation expense for personnel in executive, business development, finance, human resources, legal, medical affairs, commercial and support personnel functions. Selling, general and administrative expenses also include insurance and professional fees for legal, patent, consulting, accounting and audit services, and the cost associated with the production and sale of free goods.

We expect that our general and administrative expenses will continue to increase in the future as we continue to perform commercialization and sales activities and increase our headcount to support our business objectives. We also



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anticipate that we will continue to incur significant costs associated with being a public company, including accounting, audit, legal, compliance and director and officer insurance costs as well as investor and public relations expenses, and that such costs will increase over time especially as we are now a large accelerated filer and are no longer permitted to rely on exemptions from certain requirements that are applicable to public companies that are not emerging growth companies.

Interest Income

Interest income consists of income recognized from investments in money market funds and U.S. Treasury notes offset by expenses related to investments.

Income Taxes

As an exempted company incorporated under the laws of Bermuda, we are principally subject to taxation in Bermuda. Under the current laws of Bermuda, tax on a company's income is assessed at a zero percent tax rate. As a result, we have not recorded any income tax benefits from our losses incurred in Bermuda during each reporting period, and no net operating loss carryforwards are currently available to us for those losses. Our wholly owned U.S. subsidiaries, Kiniksa US, and Primatope are subject to federal and state income taxes in the United States. Our wholly owned subsidiary Kiniksa Pharmaceuticals (UK), Ltd., and its wholly owned subsidiaries, Kiniksa Pharmaceuticals (Germany) GmbH, Kiniksa Pharmaceuticals (France) SARL, and Kiniksa Pharmaceuticals GmbH are subject to taxation in their respective countries. Our provision for income taxes relates mainly to U.S. taxable income, generated by our wholly owned subsidiary Kiniksa US.





Results of Operations

Comparison of the Three Months Ended June 30, 2021 and 2020

The following table summarizes our results of operations for the three months ended June 30, 2021 and 2020:




                                             Three Months Ended
                                                 June 30,
                                             2021          2020        Change

                                                     (in thousands)

Revenue:
Product revenue, net                      $    7,704    $        -    $   7,704
Costs and Operating expenses:
Cost of goods sold                             2,466             -        2,466
Research and development                      23,945        22,324        1,621
Selling, general and administrative           21,848         9,536       12,312
Total operating expenses                      48,259        31,860       16,399
Loss from operations                        (40,555)      (31,860)      (8,695)
Interest income                                    6           266        (260)
Loss before provision for income taxes      (40,549)      (31,594)      (8,955)
Provision for income taxes                   (1,014)       (5,875)        4,861
Net loss                                  $ (41,563)    $ (37,469)    $ (4,094)




Product Revenue, Net

Following the FDA approval of ARCALYST in March 2021, the Company began generating product revenue from sales of ARCALYST in April 2021. We recognize product revenue, net of ARCALYST at the transaction price when the specialty pharmacy or specialty distributors obtains control of our products, which typically occurs upon shipment of the product from the third party logistics provider. We recognized net revenue from the sale of ARCALYST of $7.7 million.



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The net revenues represent total revenues adjusted for discounts and allowances, including estimated cash discounts, chargebacks, rebates, returns, copay assistance, and specialty pharmacy and distributor fees. These adjustments represent variable consideration under ASC 606 and are estimated using the expected value method and are recorded when revenue is recognized on the sale of the product. These adjustments are established by management as its best estimate based on available information and will be adjusted to reflect known changes in the factors that impact such allowances. Adjustments for variable consideration are determined based on the contractual terms with customers, historical trends, communications with customers and the levels of inventory remaining in the distribution channel, as well as expectations about the market for the product and anticipated introduction of competitive products.





Cost of Goods Sold


Upon the first sale commencing in April 2021, we began generating cost of goods sold associated with the sales of ARCALYST. We recognized cost of goods sold from the sale of ARCALYST of $2.5 million which includes $0.3 million for the amortization of the regulatory milestone. As of June 30, 2021, we continue to sell the relabeled ARCALYST product previously acquired to support the clinical trials that carries zero cost We expect to sell the remaining zero cost inventory in Q3 2021.

Research and Development Expenses




                                                            Three Months Ended
                                                                June 30,
                                                             2021         2020       Change

                                                              (in thousands)
Rilonacept                                                $    3,212    $  5,132   $ (1,920)
Mavrilimumab                                                   7,054       3,335       3,719
Vixarelimab                                                    2,130       1,807         323
KPL-404                                                        1,814         775       1,039

Unallocated research and development expenses: Personnel related (including share-based compensation) 6,341 7,734 (1,393) Other

                                                          3,394       3,541       (147)
Total research and development expenses                   $   23,945    $ 22,324   $   1,621

Research and development expenses were $23.9 million for the three months ended June 30, 2021, compared to $22.3 million for the three months ended June 30, 2020, an increase of $1.6 million. During the three months ended June 30, 2021, the increase in research and development expenses incurred related to the mavrilimumab Phase 2/3 clinical trial in COVID-19 related ARDS, offset by a decrease in the cost associated with our RHADSODY trial. The following includes additional information on our development programs.

The direct costs for our ARCALYST program were $3.2 million during the three months ended June 30, 2021, compared to $5.1 million during the three months ended June 30, 2020, a decrease of $1.9 million. The decrease in expenses incurred related primarily to the completion of RHAPSODY, our global, pivotal Phase 3 clinical trial in recurrent pericarditis, and transition to the long-term extension.

The direct costs for our mavrilimumab program were $7.1 million during the three months ended June 30, 2021, compared to $3.3 million during the three months ended June 30, 2020, or an increase of $3.8 million. The increase in expenses incurred related primarily to our Phase 2/3 clinical trial in COVID-19 ARDS offset by a decrease in expenses for the completion of our global Phase 2 clinical trial in GCA.

The direct costs for our vixarelimab program were $2.1 million during the three months ended June 30, 2021, compared to $1.8 million during the three months ended June 30, 2020, an increase of $0.3 million. Expenses incurred during the three months ended June 30, 2021 were primarily related to our Phase 2b clinical trial in prurigo nodularis



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while during the three months ended June 30, 2020 expenses were primarily related to the continued progress and expansion of our Phase 2a clinical trial in prurigo nodularis, as well as costs related to the conclusion of our exploratory Phase 2 clinical trial in diseases characterized by chronic pruritus.

The direct costs for our KPL-404 program were $1.8 million during the three months ended June 30, 2021, compared to $0.8 million during the three months ended June 30, 2020, an increase of $1.0 million. The increase in expenses incurred primarily related to manufacturing of drug product supply for our anticipated Phase 2 trial in rheumatoid arthritis.

Unallocated research and development expenses were $9.7 million for the three months ended June 30, 2021 compared to $11.3 million for the three months ended June 30, 2020, a decrease of $1.6 million. The decrease of $1.6 million in unallocated research and development expenses was primarily due to the supply chain and quality related costs associated with our commercial ARCALYST program, which are now included as cost of goods sold.

Selling, General and Administrative Expenses

Selling, general and administrative expenses were $21.8 million for the three months ended June 30, 2021 compared to $9.5 million for the three months ended June 30, 2021. The increase of $12.3 million was primarily due to increase of $6.6 million in personnel-related costs related to the build out of our commercial function, including hiring a sales force and $1.6 million in marketing expenses associated with the commercial launch of ARCALYST. Personnel-related costs for the three months ended June 30, 2021 and 2020 included share-based compensation of $3.8 million and $2.7 million, respectively.

Interest Income

Interest income was less than $0.1 million for the three months ended June 30, 2021 compared to interest income of $0.3 million for the three months ended June 30, 2020. The decrease was due primarily to lower interest rates on U.S. Treasury notes and a lower average balance in short term investments

Provision for Income Taxes

For the three months ended June 30, 2021, we recorded a provision for income taxes of $1.0 million relating primarily to the tax impact from the current tax expense due to income from our cost plus arrangements in the United States, net of R&D credits utilized offset by tax benefit related to the exercise of share options. For the three months ended June 30, 2020, we recorded a provision for income taxes of $5.9 million relating primarily to the tax impact from the exercise of share options and recording a valuation allowance against certain deferred tax assets.







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Comparison of the Six Months Ended June 30, 2021 and 2020

The following table summarizes our results of operations for the six months ended June 30, 2021 and 2020:




                                              Six Months Ended
                                                 June 30,
                                             2021          2020         Change

                                                      (in thousands)
Revenue:
Product revenue, net                      $  7,704      $        -    $    7,704
Operating expenses:
Cost of goods sold                             2,466             -         2,466
Research and development                      52,628        43,225         9,403
Selling, general and administrative           42,448        18,022        24,426
Total operating expenses                      97,542        61,247        36,295
Loss from operations                        (89,838)      (61,247)      (28,591)
Interest income                                   15         1,055       (1,040)
Loss before provision for income taxes      (89,823)      (60,192)      (29,631)
Provision for income taxes                   (1,224)       (3,696)         2,472
Net loss                                  $ (91,047)    $ (63,888)    $ (27,159)




Product Revenue, Net

Following the FDA approval of ARCALYST in March 2021, the Company began generating product revenue from sales of ARCALYST in April 2021. The analysis of revenue for the six months ended June 30, 2021 is consistent with the analysis for the three months ended June 30, 2021 as presented in the Comparison of the Three Months Ended June 30, 2021 and 2020.

Cost of goods sold

Upon the first sale commencing in April 2021, we began generating cost of goods sold associated with the sales of ARCALYST. We recognized cost of goods sold from the sale of ARCALYST of $2.5 million which includes $0.3 million for the amortization of the regulatory milestone.

Research and Development Expenses




                                                           Six Months Ended
                                                              June 30,
                                                           2021        2020       Change

                                                            (in thousands)
Rilonacept                                               $  6,013    $  9,169   $ (3,156)
Mavrilimumab                                               15,917       5,545      10,372
Vixarelimab                                                 4,786       4,463         323
KPL-404                                                     2,320       2,046         274
Unallocated research and development expenses:                                          -

Personnel related (including share-based compensation) 16,083 15,095 988 Other

                                                       7,509       6,907         602
Total research and development expenses                  $ 52,628    $ 43,225   $   9,403

Research and development expenses were $52.6 million for the six months ended June 30, 2021, compared to $43.2 million for the six months ended June 30, 2020, an increase of $9.4 million. During the six months ended June 30, 2021, the increase in research and development expenses incurred related to the mavrilimumab Phase 2/3 clinical trial in



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COVID-19 related ARDS, offset by a decrease in the cost associated with our RHADSODY trial. The following includes additional information on our development programs.

The direct costs for our ARCALYST program were $6.0 million during the six months ended June 30, 2021, compared to $9.2 million during the six months ended June 30, 2020, a decrease of $3.2 million. The decrease in expenses incurred related primarily to the completion of RHAPSODY, our global, pivotal Phase 3 clinical trial in recurrent pericarditis, and transition to the long-term extension.

The direct costs for our mavrilimumab program were $15.9 million during the six months ended June 30, 2021, compared to $5.5 million during the six months ended June 30, 2020, or an increase of $10.4 million. The increase in expenses incurred related primarily to our Phase 2/3 clinical trial in COVID-19 related ARDS offset by a decrease in expenses for the completion of our global Phase 2 clinical trial in GCA.

The direct costs for our vixarelimab program were $4.8 million during the six months ended June 30, 2021, compared to $4.5 million during the six months ended June 30, 2020, or an increase of $0.3 million. Expenses incurred during the six months ended June 30, 2021 were primarily related to the start-up of our Phase 2b clinical trial in prurigo nodularis while during the six months ended June 30, 2020 expenses were primarily related to the continued progress and expansion of our Phase 2a clinical trial in prurigo nodularis, as well as costs related to the conclusion of our exploratory Phase 2 clinical trial in diseases characterized by chronic pruritus.

The direct costs for our KPL-404 program were $2.3 million during the six months ended June 30, 2021, compared to $2.0 million during the six months ended June 30, 2020, an increase of $0.3 million. The increase in expenses incurred primarily related to manufacturing of drug product supply for our anticipated Phase 2 trial in rheumatoid arthritis.

Unallocated research and development expenses were $23.6 million for the six months ended June 30, 2021 compared to $22.0 million for the six months ended June 30, 2020. The increase of $1.6 million in unallocated research and development expenses was primarily due to an increase in personnel-related costs of $3.2 million, offset a decrease of $2.1 million due to the supply chain and quality related costs associated with our commercial ARCALYST program, which are now included as cost of goods sold. Personnel-related costs for the six months ended June 30, 2021 and 2020 included share-based compensation of $4.6 million and $4.0 million, respectively.

Selling, General and Administrative Expenses

Selling, general and administrative expenses were $42.4 million for the six months ended June 30, 2021 compared to $18.0 million for the six months ended June 30, 2021. The increase of $24.4 million was primarily due to an increase of $14.3 million in personnel-related costs related to the build out of our commercial function, including hiring of a sales force and $4.9 million in marketing expenses associated with the commercial launch of ARCALYST. Personnel-related costs for the six months ended June 30, 2021 and 2020 included share-based compensation of $8.2 million and $5.1 million, respectively.

Interest Income

Interest income was less than $0.1 million for the six months ended June 30, 2021 compared to interest income of $1.1 million for the six months ended June 30, 2020. The decrease was due primarily to lower interest rates on U.S. Treasury notes and a lower average balance in short term investments.

Provision Benefit for Income Taxes

For the six months ended June 30, 2021, we recorded a provision for income taxes of $1.2 million relating primarily to the tax impact from the current tax expense due to income from our cost plus arrangements in the United States, net of R&D credits utilized offset by tax benefit related to the exercise of share options. For the six months ended June 30, 2020, we recorded a provision for income taxes of $3.7 million relating primarily to the tax impact from recording a valuation allowance against certain deferred tax assets.



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Liquidity and Capital Resources

Following the FDA approval of ARCALYST in March 2021, the Company began generating product revenue from sales of ARCALYST in April 2021. However, we will continue to incur significant operating losses and negative cash flows from our operations.

On May 18, 2020, we completed a follow-on offering of 2,760,000 Class A common shares, inclusive of the exercise of the underwriters' overallotment option at a public offering price of $18.25 and a concurrent private placement of 1,600,000 Class A1 common shares at an offering price of $18.25 per share for aggregate gross proceeds of $79.6 million. The aggregate net proceeds to us from the follow-on offering and concurrent private placement, inclusive of the over-allotment option exercise, was $74.5 million after deducting underwriting discounts and commissions, placement agent fees and other offering costs.

On July 24, 2020, we completed a follow-on offering of 5,952,381 Class A common shares, at a public offering price of $21.00 and a concurrent private placement of 1,428,572 Class A1 common shares at an offering price of $21.00 per share for aggregate gross proceeds of $155.0 million. The estimated aggregate net proceeds to us from the follow-on offering and concurrent private placement was $146.0 million after deducting underwriting discounts and commissions, placement agent fees and other offering costs.

As of June 30, 2021, we had cash, cash equivalents and short-term investments of $225.9 million.





Cash Flows

The following table summarizes our cash flows for each of the periods presented:




                                                                     Six Months Ended
                                                                        June 30,
                                                                    2021          2020

                                                                      (in thousands)
Net cash used in operating activities                            $ (78,905)    $ (61,020)
Net cash provided by investing activities                           130,827        57,573
Net cash provided by financing activities                             1,993        79,975

Net increase in cash and cash equivalents and restricted cash $ 53,915 $ 76,528






Operating Activities

During the six months ended June 30, 2021, operating activities used $78.9 million of cash, primarily resulting from our net loss of $91.0 million as well as net cash used by our operating assets and liabilities of $3.5 million offset by non-cash charges of $15.7 million. Net cash used by our operating assets and liabilities for the six months ended June 30, 2021 consisted primarily of a $6.4 million increase in inventory and a $2.6 million increase in accounts receivable primarily due to the commercial launch of ARCALYST in 2021 offset by an increase of $6.4 million in accrued expenses and accounts payable primarily due to increases related to our clinical trial costs and other selling, general and administration accruals offset by our pre-commercialization activities of our ARCALYST program and the cash payment of the 2020 employee bonuses.

During the six months ended June 30, 2020, operating activities used $61.0 million of cash, primarily resulting from our net loss of $63.9 million and net cash used in our operating assets and liabilities of $12.0 million, partially offset by non-cash charges of $14.9 million. Net cash used in our operating assets and liabilities for the six months ended June 30, 2020 consisted of a $3.2 million decrease in accounts payable primarily due to the timing of vendor invoicing and payments, a $4.1 decrease in accrued expenses and other liabilities primarily due to the cash payment of the 2019 employee bonuses, a $0.8 million decrease in operating lease liabilities due to monthly payments for our right of use assets, and a $3.8 million increase in prepaid expenses and other current assets due to increases in prepaid expenses to CROs related to our clinical trials.



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Investing Activities

During the six months ended June 30, 2021 investing activities provided $130.9 million of cash, consisting of $248.4 million from proceeds of maturities of short-term investments, partially offset by $97.5 million of purchases of short-term investments and $20.0 million related to the payment of a regulatory milestone incurred under the Regeneron Agreement.

During the six months ended June 30, 2020 investing activities provided $57.6 million of cash, consisting of $191.8 million from proceeds of maturities of short-term investments, partially offset by $134.0 million of purchases of short-term investments and $0.2 million of purchases of property and equipment.

Financing Activities

During the six months ended June 30, 2021, net cash provided by financing activities was $2.0 million, consisting of proceeds from the exercise of employee share options.

During the six months ended June 30, 2020, net cash provided by financing activities was $80.0 million, consisting of net proceeds of $74.6 million from our issuance and sale of Class A common shares in a follow-on public offering, inclusive of the exercise of the underwriters' over-allotment option to purchase additional Class A common shares, and concurrent issuance and sale of Class A1 common shares in a private placement, after deduction of underwriting discounts and commissions, placement agent fees and other offering costs and $5.4 million of proceeds primarily from the exercise of share options.

Funding Requirements

We expect to incur significant expenses in connection with our ongoing and planned activities as we commercialize ARCALYST and advance our current and future product candidates through preclinical and clinical development, seek regulatory approval and commercialize one or more of our current or future product candidates, if approved. In addition, if we obtain marketing approval for any of our current or future product candidates, we expect to incur significant additional commercialization expenses related to such activities. We may also incur expenses in connection with the in-licensing or acquisition of additional product candidates. As a result, our related personnel costs will increase, including costs associated with share-based compensation. We also expect to incur additional expenses related to milestone and royalty payments payable to third parties with whom we have entered into license, acquisition and other similar agreements to acquire the rights to our product candidates. Additionally, we expect to continue to incur costs associated with operating as a public company, including significant legal, accounting, investor relations and other expenses. We expect to incur expenses as we:

? conduct our current and planned clinical trials for mavrilimumab, vixarelimab

and KPL-404, as well as for any future product candidates, as applicable;

increase clinical and commercial manufacturing capabilities or make

? arrangements with additional third party manufacturers to successfully

manufacture our product candidates;

? develop and timely deliver clinical grade and commercial grade product

formulations that can be used in our clinical trials and for commercial sale;

? seek regulatory approvals for any product candidates that successfully complete

clinical trials;

maintain, establish, and/or expand a sales, marketing, medical affairs and

? distribution infrastructure to commercialize ARCALYST or any of our current or

future product candidates for which we may obtain marketing approval and intend

to commercialize on our own;




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launch commercial sales of ARCALYST and of any of our current or future product

? candidates, if and when approved, whether alone or in collaboration with

others;

? make milestone or other payments under any current or future license,

acquisition, collaboration or other strategic transaction agreements;

? hire additional clinical, quality and research and development personnel;

expand our operational, financial and management systems and increase personnel

? globally to support our clinical development, manufacturing and

commercialization efforts and our operations as a public company;

? maintain, expand and protect our intellectual property portfolio; and

? in-license or acquire other product candidates and technologies or their

related businesses, if we determine to do so.

We believe that our existing cash, cash equivalents and short-term investments will enable us to fund our operating expenses and capital expenditure requirements for at least the next 12 months. We have based these estimates on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we expect. We anticipate that we may require additional capital if we choose to pursue in-licenses or acquisitions of other product candidates and technologies or their related businesses. We expect to continue to incur significant commercialization expenses related to product manufacturing, sales, marketing and distribution of ARCALYST. In addition, if we obtain regulatory approval for any of our current or future product candidates, pursue additional indications for our products or any of our current or future product candidates, we expect to incur significant expenses related to product development and manufacturing, sales, marketing and distribution, depending on where we choose to commercialize.

Because of the numerous risks and uncertainties associated with research, development and commercialization of biologic products, we are unable to estimate the exact amount of our working capital requirements. Our future funding requirements will depend on and could increase significantly as a result of many factors, including:

? any impact of the COVID-19 pandemic on our business, including our preclinical

studies and clinical trials, and operations;

? the scope, progress, results and costs of researching and developing our

product candidates, and conducting preclinical and clinical trials;

? the costs, timing and outcome of regulatory review of our product candidates;

the costs, timing and ability to manufacture our product candidates to supply

? our clinical and preclinical development efforts and our clinical trials and

commercialization;

the costs of future activities, including product sales, medical affairs,

? marketing, manufacturing, pricing and reimbursement, distribution and

compliance, for any of our product candidates for which we receive marketing

approval;

? the costs of manufacturing commercial-grade product and necessary inventory to

support commercial launch and ongoing sales;

? the ability to receive additional non-dilutive funding;

? the revenue received from commercial sale of ARCALYST or any of our current or

future products candidates, should they receive marketing approval;




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the costs of preparing, filing and prosecuting patent applications, maintaining

? and enforcing our intellectual property rights and defending intellectual

property-related claims;

? our ability to establish and maintain licensing, collaboration or other

strategic transactions and arrangements on favorable terms, if at all;

? the extent to which we acquire or in-license other product candidates,

technologies and their related businesses; and

? the timing, receipt and amount of sales of, or milestone payments related to or

royalties on, our current or future product candidates, if any.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of public or private equity offerings, debt financings, or other sources, including, licensing, collaboration, marketing, distribution or other strategic transactions or arrangements with third parties. To the extent that we raise additional capital through the sale of equity or convertible debt securities, our shareholders' ownership interest may be materially diluted, and the terms of such securities could include liquidation or other preferences that adversely affect our shareholders' rights as a common shareholder. Debt financing and preferred equity financing, if available, may involve agreements that include restrictive covenants that limit our ability to take specified actions, such as incurring additional debt, making capital expenditures or declaring dividends. In addition, debt financing would result in fixed payment obligations.

If we raise funds through licensing, collaboration, marketing, distribution or other strategic transactions or arrangements with third parties, we may have to relinquish valuable rights to our technologies, product candidates or future revenue streams, or otherwise agree to terms that may not be favorable to us. If we are unable to obtain funding, we could be forced to delay, reduce or eliminate some or all of our research and development programs for product candidates, product portfolio expansion or commercialization efforts, which could adversely affect our business prospects, or we may be unable to continue operations.

Contractual Obligations and Commitments

During the six months ended June 30, 2021, there were no material changes outside the ordinary course of our business to our contractual obligations and commitments set forth under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations-Contractual Obligations and Commitments" in the Annual Report. See Note 14 to our consolidated financial statements included in Item 1, "Consolidated Unaudited Financial Statements," of this Quarterly Report for a discussion of obligations and commitments.

Critical Accounting Policies and Significant Judgments and Estimates

Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States. The preparation of our consolidated financial statements and related disclosures requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and the disclosure of contingent assets and liabilities in our financial statements. We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

During the six months ended June 30, 2021, we included the estimates associated to revenue recognition to our critical accounting policies. Our critical accounting policies are described under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations-Critical Accounting Policies and Significant Judgments and Estimates" in the Annual Report and the notes to the consolidated financial statements included in Item 1,



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"Consolidated Unaudited Financial Statements," included in this Quarterly Report. We believe that of our critical accounting policies, the following accounting policies involve the most judgment and complexity:

? accrued research and development expenses;

? share-based compensation; and




 ? revenue recognition


Revenue Recognition


ASC 606 outlines a five-step process for recognizing revenue from contracts with customers: i) identify the contract with the customer, ii) identify the performance obligations in the contract, (iii) determine the transaction price, iv) allocate the transaction price to the separate performance obligations in the contract, and (v) recognize revenue associated with the performance obligations as they are satisfied.

We only apply the five-step model to contracts when it is probable that we will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. Once a contract is determined to be within the scope of ASC 606, we determine the performance obligations that are distinct. We recognize as revenues the amount of the transaction price that is allocated to each respective performance obligation when the performance obligation is satisfied or as it is satisfied. Generally, our performance obligations are transferred to customers at a point in time, typically upon receipt of the product by the customer.

ASC 606 requires entities to record a contract asset when a performance obligation has been satisfied or partially satisfied, but the amount of consideration has not yet been received because the receipt of the consideration is conditioned on something other than the passage of time. ASC 606 also requires an entity to present a revenue contract as a contract liability in instances when a customer pays consideration, or an entity has a right to an amount of consideration that is unconditional (e.g. receivable), before the entity transfers a good or service to the customer.

Product Revenue, Net

Net revenue from product sales is recognized at the transaction price when the specialty pharmacy or specialty distributors obtains control of our products, which occurs at a point in time, typically upon shipment of the product from the third party logistics provider.

Our net revenues represent total revenues adjusted for discounts and allowances, including estimated cash discounts, chargebacks, rebates, returns, copay assistance, and specialty pharmacy and distributor fees. These adjustments represent variable consideration under ASC 606 and are estimated using the expected value method and are recorded when revenue is recognized on the sale of the product. These adjustments are established by us as our best estimate based on available information and will be adjusted to reflect known changes in the factors that impact such allowances. Adjustments for variable consideration are determined based on the contractual terms with customers, historical trends, communications with customers and the levels of inventory remaining in the distribution channel, as well as expectations about the market for the product and anticipated introduction of competitive products.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in the rules and regulations of the SEC.



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