The following discussion and analysis of our financial condition and results of operations should be read together with our consolidated financial statements and related notes appearing elsewhere within this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis or set forth elsewhere within this Annual Report on Form 10-K, including information with respect to our plans and strategy for our business and related financing, includes forward-looking statements that involve risks and uncertainties and should be read together with the "Risk Factors" section of this Annual Report on Form 10-K for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis. A discussion of the year ended December 31, 2018 compared to the year ended December 31, 2017 has been reported previously in our Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on March 7, 2019, under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations."

Overview

We are a clinical-stage biopharmaceutical company using our proprietary peptide chemistry platform to develop novel therapeutics for the treatment of serious diseases that are caused by excessive or uncontrolled activation of the complement system, a critical component of the immune system. Inappropriate activation of the complement system can quickly turn it from a beneficial defense system to an aggressor that plays a major role in immune and inflammatory diseases. The complement system, which consists of approximately 30 interacting proteins, offers a target-rich opportunity for us to leverage our proprietary peptide chemistry platform, which was pioneered by Nobel Laureate Dr. Jack Szostak and allows us to inhibit certain uncontrolled complement pathway factors involved in complement-mediated diseases. Known as our Extreme Diversity™ platform, this proprietary macrocyclic peptide chemistry technology allows us to produce synthetic macrocyclic peptides that combine the diversity and specificity of antibodies with the pharmacological properties of small molecules. The relatively small molecular size of a peptide allows for enhanced tissue penetration



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compared to larger monoclonal antibodies and biologics. We believe this technology will allow us to pursue challenging targets for which only monoclonal antibodies have been developed.

On October 9, 2019, we entered into an Agreement and Plan of Merger, or the Merger Agreement, with UCB S.A., or UCB, pursuant to which we will be acquired by UCB and will survive the proposed acquisition as an indirect wholly owned subsidiary of UCB. Under the terms of the Merger Agreement, our stockholders will be entitled to receive $48.00 in cash for each share of common stock held at closing of the acquisition. The total transaction value, net of our cash of approximately $0.4 billion, is approximately $2.1 billion. The boards of directors of both UCB and Ra Pharma have unanimously approved the transaction and the Company's stockholders have voted to approve the transaction. The transaction remains subject to obtaining antitrust clearance and other customary closing conditions. The transaction is expected to close by the end of the first quarter of 2020. For additional discussion, please refer to Note 12, "Acquisition and Related Costs" to our consolidated financial statements included elsewhere within this Annual Report on Form 10-K.

We are developing our lead product candidate, zilucoplan, for the treatment of various complement-mediated diseases, including generalized myasthenia gravis (gMG), immune-mediated necrotizing myopathy (IMNM), amyotrophic lateral sclerosis (ALS), and other tissue-based complement-mediated disorders. Zilucoplan is a potent, synthetic, macrocyclic peptide inhibitor of complement component 5 (C5), formulated for convenient, self-administered, subcutaneous (SC) injection, which is an injection into the tissue under the skin. The relatively small size of this peptide allows for distinct advantages compared to larger monoclonal antibodies, including enhanced tissue penetration and an optimized route of administration. Additionally, we have a C5 life cycle management plan with an extended release (XR) program for zilucoplan and an oral, small molecule C5 inhibitor.

MG is a chronic, complement-mediated, autoimmune disease that causes weakness in the skeletal muscles. Patients with MG present with muscle weakness that characteristically becomes increasingly severe with repeated use and recovers with rest. Muscle weakness can be localized to specific muscles, such as those responsible for eye movements, but often progresses to affect a broader range, including head, limb, and respiratory muscles. This is often described as the generalized, or severe, form of the disease. We initiated a Phase 2 clinical trial with zilucoplan for gMG in the fourth quarter of 2017. In August 2018, we announced the early completion of enrollment of 44 patients in our Phase 2 clinical trial in gMG, surpassing our original enrollment target of 36 patients. We announced completion of dosing of all patients in November 2018 and reported positive top-line data in December 2018. In the Phase 2 clinical trial, zilucoplan achieved clinically meaningful and statistically significant reductions in both the primary and key secondary endpoints for both zilucoplan dose groups tested versus placebo at 12 weeks. In May 2019, we presented results from the open-label, long-term extension study, in which statistically significant and clinically meaningful improvements in primary and secondary endpoints were sustained in patients treated with zilucoplan at 24 weeks. In September 2019, the U.S. Food and Drug Administration (FDA) granted Orphan Drug Designation to zilucoplan for the treatment of MG. In October 2019, Ra Pharma announced the initiation of dosing in a single, pivotal, randomized, double-blind, placebo-controlled Phase 3 trial evaluating zilucoplan for the treatment of gMG, or the RAISE study. The trial, which incorporates feedback from the FDA, the European Medicines Agency (EMA), and Japan's Pharmaceuticals and Medical Devices Agency (PMDA), is designed to evaluate the efficacy of a once-daily, SC self-administered dose of 0.3 mg/kg of zilucoplan versus placebo. Top-line results from the RAISE study are expected in early 2021.

IMNM is an autoimmune myopathy characterized by skeletal muscle necrosis, severe proximal limb weakness, and elevated creatine kinase (CK) levels. IMNM is categorized into two subtypes defined by the presence of distinct autoantibodies against 3-hydroxy-3-methylglutaryl-coenzyme A reductase, of HMGCR, or signal recognition particle, or SRP. In IMNM, these autoantibodies drive complement-mediated necrosis of muscle fibers, resulting in severe, progressive, and debilitating proximal muscle



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weakness. In December 2019, we announced the initiation of dosing in a randomized, double-blind, placebo-controlled, multi-center, Phase 2 clinical trial evaluating zilucoplan for the treatment of IMNM. The trial is designed to evaluate the safety, tolerability, and efficacy of a once-daily, SC self-administered dose of 0.3 mg/kg of zilucoplan versus placebo. Top-line results from the Phase 2 clinical trial are expected in the second half of 2020.

ALS is the most prevalent adult-onset progressive motor neuron disease, causing the progressive degeneration of motor neurons, resulting in progressive muscle weakness and atrophy that can eventually lead to partial or total paralysis. In September 2019, zilucoplan was selected as one of the first clinical candidates to be evaluated in a pioneering platform trial for ALS, led by the Sean M. Healey & AMG Center for ALS at Mass General. In January 2020, we announced the U.S. FDA's Investigational New Drug (IND) application for the HEALEY ALS Platform Trial.

We have a life-cycle management plan with an extended release (XR) program for zilucoplan and an oral, small molecule C5 inhibitor, as well as inhibitors of other complement factors for certain renal, autoimmune, and central nervous system (CNS) diseases. Our XR program includes two formulations: the poly (D,L-lactic-co-glycolic acid) (PLGA) XR formulation of zilucoplan and the FluidCrystal® (FC) XR formulation of zilucoplan. We anticipate the XR program entering human clinical studies in the second half of 2020.

In April 2019, we presented pre-clinical data for the PLGA XR formulation of zilucoplan, in which rapid and sustained pharmacodynamic inhibition of C5 was achieved with once-weekly subcutaneous dosing in non-human primates. We believe these data support the possibility of once weekly or less frequent dosing for zilucoplan.

In July 2019, we entered into an exclusive worldwide license agreement for the use of Camurus AB's proprietary FC technology to develop, manufacture, and commercialize a long-acting formulation of zilucoplan. In July 2019, we reported pre-clinical data for the FC XR formulation of zilucoplan, in which non-human primates receiving a single dose of the FC XR formulation of zilucoplan rapidly achieved and maintained target levels of complement inhibition for at least seven days without the need for intravenous loading.

In addition to our focus on developing novel therapeutics to treat complement-mediated diseases, we have validated our Extreme Diversity™ platform by successfully identifying and delivering orally-available cyclic peptides for a non-complement cardiovascular target with a large market opportunity in a collaboration with Merck & Co., Inc., or Merck. In August 2019, we earned a clinical development milestone from Merck associated with the dosing of the first patient in a Phase 1 clinical trial. Since our inception in June 2008, we have devoted substantially all of our resources to organizing and staffing our company, business planning, raising capital, acquiring and developing our proprietary chemistry technology, identifying potential product candidates and conducting pre-clinical studies of our product candidates and a clinical trial of our lead product candidate, zilucoplan. To date, we have not generated any product revenue and have financed our operations primarily through the public offering and the private placement of our securities and revenue from our collaboration with Merck. As of December 31, 2019, we had received an aggregate of $515.5 million in net proceeds from the issuance of equity and debt securities and $23.0 million in payments in connection with our collaboration and license agreement with Merck, or the Merck Agreement. As of December 31, 2019, our principal source of liquidity was cash and cash equivalents, which totaled $265.0 million.

On October 31, 2016, we completed an initial public offering, or the IPO, in which we issued and sold 7,049,230 shares of common stock at a public offering price of $13.00 per share, resulting in net proceeds of $82.8 million after deducting $6.4 million of underwriting discounts and commissions and offering costs of $2.4 million. On November 29, 2016, we completed the sale of an additional 1,057,385 shares of common stock to the underwriters under the underwriters' option in the IPO to purchase additional shares at the public offering price of $13.00 per share, resulting in net proceeds of



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$12.8 million after deducting underwriting discounts and commissions of $1.0 million. The shares began trading on the Nasdaq Global Market on October 26, 2016.

In February 2018, we completed a follow-on public offering of 9,660,000 shares of common stock, including the full exercise of the underwriters' option to purchase an additional 1,260,000 shares, at $6.00 per share and received aggregate net proceeds of $54.1 million, after deducting $3.5 million of underwriting discounts and commissions and approximately $0.4 million of offering expenses.

In December 2018, we completed a follow on public offering of 9,645,161 shares of common stock, including the full exercise of the underwriters' option to purchase an additional 1,258,064 shares, at $15.50 per share and received aggregate net proceeds of $140.2 million, after deducting $9.0 million of underwriting discounts and commissions and approximately $0.3 million of offering expenses.

In May 2019, we entered into a sales agreement, or the Sales Agreement, with Jefferies LLC, or Jefferies, which permitted us to sell from time to time, at its option, up to an aggregate of $100.0 million of shares of its common stock through Jefferies, as sales agent. Sales of the common stock, if any, will be made by methods deemed to be "at the market offerings." We have agreed to pay Jefferies a commission of up to 3% of the gross proceeds from the sale of the shares of its common stock, if any. The Sales Agreement will terminate upon the earliest of: (a) the sale of $100.0 million of shares of our common stock or (b) the termination of the Sales Agreement by us or Jefferies. As of December 31, 2019, we had not sold any shares of common stock under this program.

In July 2019, we completed a follow on public offering of 4,600,000 shares of common stock, including the full exercise of the underwriters' option to purchase an additional 600,000 shares, at $32.50 per share and received aggregate net proceeds of $140.2 million, after deducting $9.0 million of underwriting discounts and commissions and approximately $0.3 million of offering expenses.

As of December 31, 2019, we had an accumulated deficit of $290.8 million. Our net losses were $102.7 million and $64.9 million for the years ended December 31, 2019 and 2018, respectively. We have incurred significant net operating losses in every year since our inception and expect to continue to incur increasing net operating losses and significant expenses for the foreseeable future. Our net losses may fluctuate significantly from quarter to quarter and year to year. We anticipate that our expenses will increase significantly as we:



        º •
        º continue to advance our lead program, zilucoplan, through clinical
          development by establishing clinical proof-of-concept activity using
          convenient SC administration in gMG, IMNM, and ALS;

        º •
        º continue our current research programs and development activities;

        º •
        º seek to identify additional research programs and additional product
          candidates;

        º •
        º initiate pre-clinical testing and clinical trials for any product
          candidates we identify and develop, maintain, expand and protect our
          intellectual property portfolio;

        º •
        º hire additional research, clinical and scientific personnel; and

        º •
        º incur additional costs associated with operating as a public company,
          including expanding our operational, finance and management teams.

We believe that, our cash and cash equivalents as of December 31, 2019, will enable us to fund our operating expenses and capital expenditure requirements through at least the end of 2021. We do not expect to generate revenue from product sales unless and until we successfully complete development and obtain regulatory approval for a product candidate, which we expect will take a number of years and is subject to significant uncertainty. Additionally, we believe that our available funds as of December 31, 2019, will be sufficient to fund pre-commercialization activities for zilucoplan, XR formulation of zilucoplan (life-cycle extension program), clinical development of pipeline programs, and for working capital and general corporate purposes. It is also possible that we will not achieve the



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progress that we expect with respect to zilucoplan because the actual costs and timing of clinical development activities are difficult to predict and are subject to substantial risks and delays. We will be required to obtain further funding through public or private equity offerings, debt financings, collaborations and licensing arrangements or other sources. Adequate additional financing may not be available to us on acceptable terms, or at all. Our failure to raise capital as and when needed would have a negative impact on our financial condition and our ability to pursue our business strategy.

Financial Overview

Revenue

We have derived all of our revenue to date from the Merck Agreement, which we entered into in April 2013. Under the Merck Agreement, we collaborated with Merck and used our proprietary drug discovery technology platform to identify orally available cyclic peptides for non-complement targets nominated by Merck and provided specific research and development services. At the signing, Merck paid us an upfront, non-refundable, license fee payment of $4.5 million. In addition, during the research term, which ended in April 2016, Merck reimbursed us for research and development services provided by us in accordance with a pre-specified number of our full-time equivalent employees working under the Merck Agreement. At the conclusion of the research term, Merck elected to continue the development of a non-complement cardiovascular program target with a large market opportunity, for which we had received $9.0 million in pre-clinical and clinical milestone payments as of December 31, 2019. For the years ended December 31, 2019 and 2018, we recognized $3.0 million and $2.5 million, respectively, from the achievement of a clinical and pre-clinical milestone. We are also entitled to receive future aggregate milestone payments of up to $56.0 million and low-to-mid single digit percentage royalties on any future sales for this program target. For additional information about the Merck Agreement, see Item 8, "Financial Statements and Supplementary Data" within this Annual Report on Form 10-K.

To date, we have not generated any revenue from product sales and do not expect to do so in the near future. We expect that our revenue will be less than our expenses for the foreseeable future and that we will experience increasing losses as we continue our development of, and seek regulatory approvals for, our product candidates and begin to commercialize any approved products. Our ability to generate revenue for each product candidate for which we receive regulatory approval will depend on numerous factors, including competition, commercial manufacturing capability and market acceptance of our products.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our research activities, including development of our proprietary chemistry technology platform, and our pre-clinical and clinical candidates, which include:



        º •
        º employee-related expenses, including salaries, benefits, and
          stock-based compensation expense;

        º •
        º expenses incurred under agreements with CROs, CMOs, and independent
          contractors that conduct research and development, pre-clinical and
          clinical activities on our behalf;

        º •
        º costs of purchasing lab supplies and non-capital equipment used in our
          pre-clinical activities and in manufacturing pre-clinical study and
          clinical trial materials;

        º •
        º consulting, licensing and professional fees related to research and
          development activities; and

        º •
        º facility costs, depreciation, and other expenses, which include direct
          and allocated expenses for rent and maintenance of facilities,
          insurance, and other supplies.

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We expense research and development costs as incurred. We recognize costs for certain development activities, such as pre-clinical studies and clinical trials, based on an evaluation of the progress to completion of specific tasks using information provided to us by our vendors such as patient enrollment or clinical site activations for services received and efforts expended.

Research and development activities are central to our business model. We expect research and development costs to increase significantly for the foreseeable future as our current development programs progress and new programs are added.



    The following table sets forth our research and development expenses related
to our product candidates:

                                           Year Ended December, 31
                                            2019             2018
                                                (in thousands)
              Zilucoplan                $      39,602    $      22,680
              Other pipeline programs           6,372            6,676

              Allocated costs                  45,974           29,356
              Unallocated costs                36,668           25,093

              Total                     $      82,642    $      54,449

The expenses allocated to our product candidates in the table above relate to CRO and CMO costs associated with our pre-clinical studies and clinical trials. We do not allocate compensation, benefits and other employee-related expenses, costs related to facilities, depreciation, share-based compensation, research and development support services, laboratory supplies and certain other costs directly to programs.

Historically, we had not provided program costs because we have not tracked or recorded our research and development expenses on a program-by-program basis.

Because of the numerous risks and uncertainties associated with product development, we cannot determine with certainty the duration and completion costs of the current or future pre-clinical studies and clinical trials or if, when, or to what extent we will generate revenues from the commercialization and sale of our product candidates. We may never succeed in achieving regulatory approval for our product candidates. The duration, costs, and timing of pre-clinical studies and clinical trials and development of our product candidates will depend on a variety of factors, including:



        º •
        º successful completion of pre-clinical studies and Investigational New
          Drug-enabling studies;

        º •
        º successful enrollment in, and completion of, clinical trials;

        º •
        º receipt of marketing approvals from applicable regulatory authorities;

        º •
        º establishing commercial manufacturing capabilities or making
          arrangements with third-party manufacturers;

        º •
        º obtaining and maintaining patent and trade secret protection and
          non-patent exclusivity;

        º •
        º launching commercial sales of the product, if and when approved,
          whether alone or in collaboration with others;

        º •
        º acceptance of the product, if and when approved, by patients, the
          medical community and third-party payors;

        º •
        º effectively competing with other therapies and treatment options;

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        º •
        º a continued acceptable safety profile following approval;

        º •
        º enforcing and defending intellectual property and proprietary rights
          and claims; and

        º •
        º achieving desirable medicinal properties for the intended indications.

A change in the outcome of any of these factors could mean a significant change in the costs and timing associated with the development of our current and future pre-clinical and clinical product candidates. For example, if the FDA or another regulatory authority were to require us to conduct clinical trials beyond those that we currently anticipate will be required for the completion of clinical development, or if we experience significant delays in execution of or enrollment in any of our pre-clinical studies or clinical trials, we could be required to expend significant additional financial resources and time on the completion of pre-clinical and clinical development. We expect our research and development expenses to increase for the foreseeable future as we continue the development of product candidates.

General and Administrative Expenses

General and administrative expenses consist primarily of employee related expenses, including salaries, benefits, and stock-based compensation, for personnel in executive, finance, facility operations and administrative functions. Other significant costs include facility costs not otherwise included in research and development expenses, legal fees relating to patent and corporate matters, and fees for accounting, tax and consulting services.

We anticipate that our general and administrative expenses will increase in the future to support continued research and development activities, potential commercialization of our product candidates and increased costs of operating as a public company. These increases will likely include increased costs related to the hiring of additional personnel and fees to outside consultants, lawyers and accountants, among other expenses. Additionally, we anticipate increased costs associated with being a public company, including expenses related to services associated with maintaining compliance with exchange listing and SEC, requirements, director and officer insurance costs and investor and public relations costs.

Other Income (Expense), Net

Other income (expense), net primarily consists of interest income earned on our cash and cash equivalents and changes in in fair value of preferred stock tranche rights.

Income Taxes

We have not recorded a provision for federal or state income taxes as we have had cumulative net operating losses since inception.

Critical Accounting Policies and Significant Judgments and Estimates

Our discussion and analysis of our liquidity, capital resources and results of operations is based upon our consolidated financial statements prepared in accordance with generally accepted accounting principles in the U.S. The preparation of these financial statements requires us to make certain estimates and assumptions that may affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses during the reported periods and related disclosures. These estimates and assumptions are monitored and analyzed by us for changes in facts and circumstances, and material changes in these estimates could occur in the future. We base our estimates on our historical experience, trends in the industry and various other factors that are believed to be reasonable under the circumstances. Actual results may differ from our estimates under different assumptions or conditions.



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We believe that our application of the following accounting policy, which requires significant judgments and estimates on the part of management, is the most critical to aid in fully understanding and evaluating our reported financial results:

Research and Development Expenses

We expense research and development costs to operations as incurred. We defer and capitalize nonrefundable advance payments we make for research and development activities until the related goods are received or the related services are performed.

Research and development expenses comprise costs incurred in performing research and development activities, including salaries, benefits and other employee-related expenses, share-based compensation expense, laboratory supplies and other direct expenses, facilities cost, overhead costs, third-party contract costs relating to pre-clinical studies and clinical trial activities and related contract manufacturing expenses, and other outside costs.

As part of the process of preparing our consolidated financial statements, we are required to estimate certain of our research and development expenses, including estimates of third-party contract costs relating to pre-clinical studies and clinical trial activities and related contract manufacturing expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed for us 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 the actual cost.

The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers to gauge the reasonableness of our estimates. Differences between actual and estimated expenses recorded have not been material and are adjusted for in the period in which they become known. However, if we incorrectly estimate activity levels associated with such research and development activities at a given point in time, we could be required to record material adjustments in future periods. Examples of estimated research and development expenses include fees paid to:



        º •
        º CROs in connection with clinical trials;

        º •
        º CMOs with respect to clinical materials, intermediates, drug substance
          and drug product;

        º •
        º vendors in connection with pre-clinical development activities; and

        º •
        º vendors related to manufacturing, development and distribution of
          clinical supplies.

We base our expenses related to clinical trials on our estimates of the services received and efforts expended pursuant to contracts with multiple CROs that conduct and manage clinical trials on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the clinical expense. Payments under some of these contracts depend on factors such as the successful enrollment of subjects and the completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed, enrollment of subjects and the level of effort to be expended in each period.



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Result of Operations

Comparison of the Years Ended December 31, 2019 and 2018



    The following table summarizes our results of operations:

                                         Year Ended December 31,
                                            2019           2018      $ Change    % Change
                                               (in thousands, except percentages)
Revenue                                $        3,000    $   2,500   $     500        20.0 %
Operating expenses:
Research and development                       82,642       54,449      28,193        51.8 %
General and administrative                     27,337       14,439      12,898        89.3 %

Total operating expenses                      109,979       68,888      41,091        59.6 %

Loss from operations                         (106,979 )    (66,388 )   (40,591 )      61.1 %
Other income, net                               4,291        1,426       2,865       200.9 %

Net loss before benefit from income
taxes                                        (102,688 )    (64,962 )   (37,726 )      58.1 %
Benefit from income taxes                           -          (19 )        19      -100.0 %

Net loss                               $     (102,688 )  $ (64,943 ) $ (37,745 )      58.1 %





Revenue

Revenue for the year ended December 31, 2019, was $3.0 million resulting from the achievement of a clinical milestone under the Merck Agreement. Revenue for the year ended December 31, 2018, was $2.5 million resulting from the achievement of a pre-clinical milestone under the Merck Agreement.

Research and Development Expenses

Research and development expenses increased by $28.2 million to $82.6 million for the year ended December 31, 2019, from $54.4 million for the year ended December 31, 2018. This increase was attributable to: a $16.6 million increase in CRO and CMO expenses primarily relating to our lead product candidate zilucoplan; a $7.0 million increase in compensation, benefits, non-cash stock-based compensation, and other employee-related expenses due to 2019 salary increases and higher average headcount to support our increased research and development activities; a $2.0 million increase in license fees related to an upfront payment in connection with our zilucoplan FluidCrystal® (FC) extended release formulation under development with Camurus; a $1.1 million increase in consulting and professional fees; a $0.5 million increase in laboratory supply and reagent expenses; and a $1.0 million increase in other expenses.

General and Administrative Expenses

General and administrative expenses increased by $12.9 million to $27.3 million for the year ended December 31, 2019, from $14.4 million for the year ended December 31, 2018. This increase was attributable to: a $5.1 million increase in third-party professional fees related to the Merger Agreement with UCB; a $3.8 million increase in compensation, benefits, non-cash stock-based compensation, and other employee-related expenses due to 2019 salary increases and higher average headcount to support our increased activities; a $1.4 million increase in consulting and professional fees primarily related to pre-commercialization activities; a $0.8 million increase in legal, audit and insurance costs; a $0.7 million increase to patent costs; and a $1.1 million increase in other expenses.



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Other Income, Net

Other income, net increased by approximately $2.9 million to $4.3 million during the year ended December 31, 2019, from $1.4 million in other income, net for the year ended December 31, 2018. This increase was due to a $2.9 million increase in interest income.

Liquidity and Capital Resources

Overview

We have funded our operations from inception through December 31, 2019 primarily through the public offering and the private placement of our securities and revenue from our collaboration with Merck. As of December 31, 2019, we had received an aggregate of $515.5 million in net proceeds from the issuance of equity and debt securities and $23.0 million in payments in connection with our collaboration and license agreement with Merck. As of December 31, 2019, we had cash and cash equivalents of $265.0 million.

On October 31, 2016, we completed the IPO, in which we issued and sold 7,049,230 shares of common stock at a public offering price of $13.00 per share, resulting in net proceeds of $82.8 million after deducting $6.4 million of underwriting discounts and commissions and offering costs of $2.4 million. On November 29, 2016, we completed the sale of an additional 1,057,385 shares of common stock to the underwriters under the underwriters' option in the IPO to purchase additional shares at the public offering price of $13.00 per share, resulting in net proceeds of $12.8 million after deducting underwriting discounts and commissions of $1.0 million. The shares began trading on the Nasdaq Global Market on October 26, 2016.

In February 2018, we completed a follow-on public offering of 9,660,000 shares of our common stock, including the full exercise of the underwriters' option to purchase an additional 1,260,000 shares, at $6.00 per share and received aggregate net proceeds of $54.1 million, after deducting $3.5 million of underwriting discounts and commissions and approximately $0.4 million of offering expenses.

In December 2018, we completed a follow on public offering of 9,645,161 shares of common stock, including the full exercise of the underwriters' option to purchase an additional 1,258,064 shares, at $15.50 per share and received aggregate net proceeds of $140.2 million, after deducting $9.0 million of underwriting discounts and commissions and approximately $0.3 million of offering expenses.

In May 2019, we entered into the Sales Agreement with Jefferies which permitted us to sell from time to time, at our option, up to an aggregate of $100.0 million of shares of its common stock through Jefferies, as sales agent. Sales of the common stock, if any, will be made by methods deemed to be "at the market offerings." We have agreed to pay Jefferies a commission of up to 3% of the gross proceeds from the sale of the shares of its common stock, if any. The Sales Agreement will terminate upon the earliest of: (a) the sale of $100.0 million of shares of our common stock or (b) the termination of the Sales Agreement by us or Jefferies. As of December 31, 2019, we had not sold any shares of common stock under this program.

In July 2019, we completed a follow on public offering of 4,600,000 shares of common stock, including the full exercise of the underwriters' option to purchase an additional 600,000 shares, at $32.50 per share and received aggregate net proceeds of $140.2 million, after deducting $9.0 million of underwriting discounts and commissions and approximately $0.3 million of offering expenses.



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Cash Flows

Comparison of the Years Ended December 31, 2019 and 2018



    The following table summarizes our sources and uses of cash:

                                                      Year Ended
                                                     December 31,
                                                   2019        2018
                                                    (in thousands)
               Net cash provided by (used in):
               Operating activities              $ (87,361 ) $ (54,946 )
               Investing activities                   (865 )    (1,034 )
               Financing activities                143,396     195,421

               Net increase in cash              $  55,170   $ 139,441

Net Cash Used in Operating Activities

Cash flows used in operating activities represent the cash receipts and disbursements related to all of our activities other than investing and financing activities. Operating cash flow is derived by adjusting our net loss for (1) non-cash operating items such as depreciation and amortization, and stock-based compensation as well as (2) changes in operating assets and liabilities, which reflect timing differences between the receipt and payment of cash associated with transactions and when they are recognized in our results of operations.

Net cash used in operating activities was $87.4 million for the year ended December 31, 2019 compared to $54.9 million for the year ended December 31, 2018. The increase in net cash used in operations was primarily attributable to: a $37.8 million increase in our net loss as a result of higher operating expenses, primarily in connection with our zilucoplan development program and other research and development pipeline programs; a net increase in operating assets; partially offset by a net increase in operating liabilities and higher non-cash expenses, including stock-based compensation, depreciation and amortization.

Net Cash Used in Investing Activities

Net cash used in investing activities was $0.9 million for the year ended December 31, 2019 compared to $1.0 million for the year ended December 31, 2018. The decrease in cash used in investing activities was primarily due to a reduction in purchases of property and equipment.

Net Cash Provided by Financing Activities

Net cash provided by financing activities was $143.4 million for the year ended December 31, 2019 compared to $195.4 million for the year ended December 31, 2018. The decrease in cash provided by financing activities was primarily due to the proceeds of $195.0 million raised from the February and December 2018 follow-on offerings as compared to the $140.5 million in proceeds raised from the July 2019 follow-on offering in the comparative period; an increase of $0.6 million in payments related to restricted stock units vesting; and an increase of $0.1 million in issuance costs; partially offset by an increase of $3.2 million in proceeds from exercises of stock options and purchases of shares under our Employee Stock Purchase Plan.

Funding Requirements

We expect our expenses to increase in connection with our ongoing development activities, particularly as we advance the Phase 3 clinical program for zilucoplan, continue clinical trials of



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zilucoplan in additional indications advance the development of our pipeline programs, initiate new research and pre-clinical development efforts and seek marketing approval for any product candidates that we successfully develop. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to establishing sales, marketing, distribution and other commercial infrastructure to commercialize such products. Furthermore, we anticipate increased costs associated with being and operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce or eliminate our research and development programs or future commercialization efforts.

We believe that, our cash and cash equivalents as of December 31, 2019, will enable us to fund our operating expenses and capital expenditure requirements through at least the end of 2021. We have based our projections of operating capital requirements on assumptions that may prove to be incorrect and we may use all of our available capital resources sooner than we expect. Because of the numerous risks and uncertainties associated with the development and commercialization of zilucoplan and the research, development and commercialization of other potential product candidates, we are unable to estimate the exact amount of our operating capital requirements. Our future capital requirements will depend on many factors, including:



        º •
        º the scope, progress, timing, costs and results of clinical trials of,
          and research and pre-clinical development efforts for, our current and
          future product candidates;

        º •
        º our ability to enter into and the terms and timing of any
          collaborations, licensing agreements or other arrangements;

        º •
        º the number of future product candidates that we pursue and their
          development requirements;

        º •
        º the outcome, timing and costs of seeking regulatory approvals;

        º •
        º the costs of commercialization activities for any of our product
          candidates that receive marketing approval to the extent such costs
          are not the responsibility of any future collaborators, including the
          costs and timing of establishing product sales, marketing,
          distribution and manufacturing capabilities;

        º •
        º subject to receipt of marketing approval, revenue, if any, received
          from commercial sales of our current and future product candidates;

        º •
        º our headcount growth and associated costs as we expand our research
          and development and establish a commercial infrastructure; and

        º •
        º the costs of preparing, filing and prosecuting patent applications,
          maintaining and protecting our intellectual property rights and
          defending against intellectual property related claims.

Identifying potential product candidates and conducting pre-clinical studies and clinical trials is a time-consuming, expensive and uncertain process that takes many years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve product sales. In addition, our product candidates, if approved, may not achieve commercial success. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives. Adequate additional financing may not be available to us on acceptable terms, or at all.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings, debt financings, collaborations, strategic alliances and licensing arrangements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our existing stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of a common stockholder. Debt financing, if available, may involve agreements that include covenants



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limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends.

If we raise funds through additional collaborations, strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Off-Balance Sheet Arrangements

As of December 31, 2019, we did not have any significant off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of SEC Regulation S-K promulgated under the Exchange Act.

Recent Accounting Pronouncements

For a discussion of recently adopted or issued accounting pronouncements please refer to Item 8, "Financial Statements and Supplementary Data" within this Annual Report on Form 10-K.

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