Our management's discussion and analysis of our financial condition and results of operations are based upon our unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q, which have been prepared by us in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, and with Regulation S-X promulgated under the Securities Exchange Act of 1934, as amended. This discussion and analysis is intended to assist in providing an understanding of our financial condition, changes in financial condition and results of operations and should be read in conjunction with these unaudited condensed consolidated financial statements and the notes thereto included elsewhere in this Quarterly Report on Form 10-Q and the discussion and analysis included in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on March 16, 2021 (the "Annual Report on Form 10-K"). Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report on Form 10-Q, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in Part II, Item 1A. Risk Factors of this Quarterly Report on Form 10-Q, our actual results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.

Overview

General

We are a clinical-stage oncology company developing innovative antibody therapeutics. Our pipeline of full-length human multi-specific antibody candidates are generated from our proprietary technology platforms, which are able to generate a diverse array of antibody binding domains, or Fabs, against virtually any target. Each antibody binding domain consists of a target-specific heavy chain paired with a common light chain. Multiple binding domains can be combined to produce novel bispecific and trispecific antibodies that bind to a wide range of targets and display novel and innovative biology. These platforms referred to as Biclonics® and Triclonics® allow us to generate large numbers of diverse panels of bispecific and trispecific antibodies, respectively, which can then be functionally screened in large-scale cell-based assays to identify those unique molecules that possess novel biology, which we believe are best suited for a given therapeutic application. Further, by binding to multiple targets, Biclonics® and Triclonics® may be designed to provide a variety of mechanisms of action, including simultaneously blocking receptors that drive tumor cell growth and survival and mobilizing the patient's immune response by engaging T cells, and/or activating various killer cells to eradicate tumors.

Our technology platforms employ an assortment of patented technologies and techniques to generate human antibodies. We utilize our patented MeMo® mouse to produce a host of antibodies with diverse heavy chains and a common light chain that are capable of binding to virtually any antigen target. We use our patented CH3 domain dimerization technology to generate substantially pure multi-specific antibodies. We also employ our patented Spleen to Screen® technology to efficiently screen panels of diverse heavy chains, designed to allow us to rapidly identify Biclonics® and Triclonics® therapeutic candidates with differentiated modes of action for pre-clinical testing and clinical development.

Using our Biclonics® platform we have produced, and are currently developing, the following candidates: MCLA-128, or zenocutuzumab, for the potential treatment of solid tumors that harbor Neuregulin 1 (NRG1) gene fusions; MCLA-158 for the potential treatment of solid tumors; MCLA-145, developed in collaboration with Incyte Corporation, for the potential treatment of solid tumors, and MCLA-129 for the potential treatment of solid tumors. Furthermore, we have a pipeline of proprietary antibody candidates in pre-clinical development and intend to further leverage our Biclonics® technology platform and TriclonicsTM technology platform to identify additional multi-specific antibody candidates and advance them to clinical development.

Funding Our Operations

We are a clinical-stage company and have not generated any revenue from product sales. We expect to incur significant expenses and operating losses for the foreseeable future as we advance our antibody candidates from discovery through pre-clinical development and into clinical trials, and seek regulatory approval and pursue commercialization of any approved antibody candidate. In addition, if we obtain regulatory approval for any of our antibody candidates, if appropriate, we expect to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution.

We anticipate that we will require additional financing to support our continuing operations. Until such time as we can generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of public or private equity or debt financings or other sources, which may include collaborations, business development and licensing opportunities with third parties. Adequate additional financing may not be available to us on acceptable terms, or at all. For example, the trading prices for our and other biopharmaceutical companies' stock have been highly volatile as a result of the COVID-19 pandemic. As a result, we may face difficulties raising capital through sales of our common stock and any such sales may be on unfavorable terms. See "Impact of COVID-19 Pandemic" below and "Risk Factors-Risks Related to Our Business and Industry-The COVID-19 pandemic caused by the novel coronavirus has and may continue to adversely impact our business, including our pre-clinical studies and clinical trials, financial condition and results of operations" in Part II, Item 1A of this Quarterly Report on Form 10-Q. Our inability to raise capital



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as and when needed would have a negative impact on our financial condition and our ability to pursue our business strategy. We will need to generate significant revenue to achieve profitability, and we may never do so.

Based on our current operating plan, we expect that our existing cash, cash equivalents and marketable securities of $374.4 million as of March 31, 2021 will be sufficient to fund our operations into at least the second half of 2024.

Clinical Programs

Zenocutuzumab, or "Zeno" (MCLA-128: HER3 x HER2 Biclonics®)

NRG1 gene fusion (NRG1+) Cancers: Phase 1/2 eNRGy trial clinical data and program update planned for Q2 2021

We continue to enroll patients in the Phase 1/2 eNRGy trial to assess the safety and anti-tumor activity of Zeno monotherapy in NRG1+ cancers.

On April 28, 2021, we announced that zenocutuzumab clinical data was selected for an oral presentation at the 2021 American Society of Clinical Oncology Annual Meeting on June 4, 2021, where we plan to present interim efficacy and safety data from the eNRGy trial and Early Access Program (EAP) of Zeno in patients with NRG1 fusion positive (NRG1+) pancreatic, non-small cell lung and other cancers.

In the first quarter of 2021, we opened additional clinical trial sites, which are now at more than 35 locations, and we entered into more agreements and collaborations with companies and medical organizations with the goals of raising awareness of the eNRGy trial and providing access to molecular screening opportunities for eligible patients with cancers that may have NRG1 fusions. Merus is now working with more than ten different industry and academic collaborations across Asia, North America and Europe aimed to enhance testing for NRG1 fusions and to raise awareness of the eNRGy trial..

In August 2020, Zeno was granted Orphan Drug Designation by the U.S. FDA for pancreatic cancer and in January 2021, we announced that Zeno received Fast Track Designation for the treatment of patients with metastatic solid tumors harboring NRG1 gene fusions that have progressed on standard-of-care therapy.

MCLA-158 (Lgr5 x EGFR Biclonics®): Solid Tumors

Phase 1 trial continues: dose expansion in patients with gastro-esophageal and head-and-neck cancers

We are developing MCLA-158 for the potential treatment of solid tumors. Our phase 1 clinical trial of MCLA-158 is ongoing in the dose expansion phase.

On January 15, 2021, we presented in a poster session interim clinical data from the phase 1 dose escalation study of MCLA-158 at the American Society of Clinical Oncology 2021 Gastrointestinal Cancers Symposium. As of a data cut-off of September 2020, MCLA-158 was administered to 33 patients over 11 dose levels (5-1500 mg, flat dose), a heavily pretreated population having received a median of four lines of prior therapy. As of the cut-off date, MCLA-158 was observed to be well tolerated, and no dose limiting toxicities occurred. The recommended phase 2 dose was established at 1500 mg administered intravenously once every two weeks. Enrollment of patients with gastro-esophageal and head-and-neck cancers continues at this dose in the expansion phase of the open-label, multicenter trial, and preliminary evidence of antitumor activity has been observed.

MCLA-145 (CD137 x PD-L1 Biclonics®): Solid Tumors

Phase 1 trial advancing with clinical update planned for 2H 2021

MCLA-145 is currently being evaluated in a phase 1 open-label, multicenter dose escalation study, including a safety dose expansion phase, in patients with solid tumors. MCLA-145 is the first drug candidate co-developed under our global collaboration and license agreement with Incyte Corporation (Incyte), which permits the development and commercialization of up to 11 bispecific and monospecific antibodies from our Biclonics® platform. Merus retains full rights to develop and commercialize MCLA-145, if approved, in the United States, and Incyte is responsible for its development and commercialization outside the United States. We plan to present a clinical update at a major medical conference in the second half of 2021.

MCLA-129 (EGFR x c-MET Biclonics®): Solid Tumors

Phase 1 trial ongoing in patients with solid tumors.

MCLA-129 is currently being evaluated in a in a phase 1/2 open-label, multicenter dose escalation study, including a safety dose expansion phase, for the treatment of patients with advanced non-small cell lung cancer (NSCLC) and other solid tumors. MCLA-129 is subject to collaboration and license agreement, which permits Betta Pharmaceuticals Co. Ltd. (Betta) to exclusively develop MCLA-129 in China, while Merus retains full ex-China rights.

Impact of COVID-19 Pandemic



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The current COVID-19 pandemic has presented a substantial public health and economic challenge around the world and is affecting our employees, communities, clinical trial sites and business operations, as well as the U.S. and Dutch economies and international financial markets.

While we are currently continuing our ongoing clinical trials, the COVID-19 pandemic and related precautions have directly or indirectly impacted enrollment, new, planned clinical trial site openings, patient visits, and on-site monitoring of our clinical trials and source verification of clinical data required for presentation of clinical data for zenocutuzumab, MCLA-158, MCLA-145 and MCLA-129. We continued to observe a moderate to high impact on clinical trial enrollment and operations as a consequence of the COVID-19 pandemic during the quarter ended March 31, 2021, particularly at sites in countries not yet open to recruitment, and to a lesser extent in countries where COVID-19 related restrictions have been eased, with adjustments made to allow remote visits for some patient follow-up, and reduced onsite monitoring by the sponsor or contract research organization (CRO). As a result of the COVID-19 pandemic, we may experience further disruptions that could severely impact our business, preclinical studies and clinical trials. The extent of the impact to our overall clinical development timeline is uncertain at this time and we continue to monitor and assess the COVID-19 pandemic on a regular basis.

As a result of the COVID-19 pandemic, certain of our CROs and third-party suppliers, as well as collaborators in the U.S. and China that are developing or collaborating with us to develop certain of our pre-clinical antibody candidates have been affected. As a result of such impact, we may face difficulties with and delays in performance of certain chemistry manufacturing and controls and testing of our antibody candidates, including those associated with our collaborations with Incyte, Lilly and Simcere, which may delay or prevent their potential clinical development. While we currently do not anticipate any interruptions in our clinical trial supply of drug candidates, it is possible that the COVID-19 pandemic and response efforts may have an impact in the future on our third-party suppliers and contract manufacturing partners' ability to manufacture our clinical trial supply or source materials necessary for their manufacture.

In response to the spread of COVID-19, on March 18, 2020, we temporarily suspended our laboratory research activities at our facilities in Utrecht, the Netherlands to help secure the safety of our employees and to adhere to government recommendations of social distancing and limited public exposure in connection with the COVID-19 pandemic. We have since re-opened our offices and laboratory in Utrecht, maintaining social distancing and imposing other requirements consistent with government guidance. Further, we have recommended our employees in the U.S. and Netherlands work from home when possible and for those employees working at our offices and laboratory in Utrecht and offices in Cambridge Ma., they are required to maintain social distancing and follow requirements consistent with the guidance provided by the CDC, Federal, state and local regulations for the U.S. and RIVM for the Netherlands. While we use reasonable business practices to mitigate the risk of exposure to COVID-19 while on Company-operated premises, we cannot guarantee that traveling to and from and visiting the offices will not expose employees to infectious agents or eliminate inherent risks to our workforce and our business operations resulting from COVID-19. Given the uncertainty caused by the COVID-19 pandemic we cannot be certain that we will not suspend our laboratory research activities at our facilities or suspend use of our offices in the future.

At this time, there is significant uncertainty caused by the COVID-19 pandemic and impact of related responses. The future impact of COVID-19 on our business and clinical trials will largely depend on future developments, which are highly uncertain and cannot be predicted with confidence, such as the spread of the disease, availability and effectiveness of vaccines, arising variants, and their impact on vaccination efforts, the duration of the pandemic, travel restrictions and social distancing in the Netherlands, the United States and other countries, business closures or business disruptions, the ultimate impact of COVID-19 on financial markets and the global economy, and the effectiveness of actions taken in the Netherlands, the United States and other countries to contain and treat the disease. See "Risk Factors-Risks Related to Our Business and Industry-The COVID-19 pandemic caused by the novel coronavirus has and may continue to adversely impact our business, including our pre-clinical studies and clinical trials, financial condition and results of operations." in Part II, Item 1A of this Quarterly Report on Form 10-Q.

Collaborations

Refer to Item 1, "Business-Our Collaborations" and Note 12, "Collaborations," of the notes to our consolidated financial statements included in our Annual Report on Form 10-K and Note 8, "Collaborations," to our unaudited condensed consolidated interim financial statements elsewhere in this Quarterly Report on Form 10-Q for a description of the key terms of our arrangements.



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Discussion and Analysis of our Results of Operations

Comparison of the three months ended March 31, 2021 and 2020

Revenue

The following is a comparison of revenue:





                     Three Months Ended
                         March 31,
                 2021      2020      Change
                       (In millions)
Incyte          $  6.8     $ 6.0     $   0.8
Lilly              1.4         -         1.4
Other              0.1       0.3        (0.2 )
Total revenue      8.3       6.3         2.0



Collaboration revenue for the three months ended March 31, 2021 increased by $2.0 million as compared to the three months ended March 31, 2020, primarily as a result of an increase from a Lilly upfront payment amortization and reimbursement revenues of $1.4 million that commenced in the first quarter, and a $0.8 million increase primarily in reimbursement revenues related to Incyte reflecting activities in the period for MCLA-145. The change in exchange rates did not significantly impact collaboration revenue.

As of March 31, 2021, we had total deferred revenue of $131.8 million, which primarily relates to the upfront payment received under our Incyte collaboration agreement and Lilly collaboration agreement and is expected to be recognized over the next five and three years, respectively.

Operating Expenses

The following is a comparison of operating expenses:





                                     Three Months Ended
                                         March 31,
                              2021           2020       Change
                                       (In millions)
Research and development     $ 20.8         $ 17.0     $    3.8
General and administrative      9.3            8.9          0.4
Total operating expenses     $ 30.1         $ 25.9     $    4.2

Research and development expense for the three months ended March 31, 2021 increased by $3.8 million as compared to the three months ended March 31, 2020, primarily as a result of an increase in external and manufacturing costs related to our programs and stock-based compensation.

General and administrative expense for the three months ended March 31, 2021 increased by $0.4 million as compared to the three months ended March 31, 2020, which is not a significant change and no significant offsetting items occurred in the period.

Other Income (Loss), Net

The following is a comparison of other income, net:





                                      Three Months Ended
                                          March 31,
                                  2021      2020      Change
                                        (In millions)
Interest (expense) income, net   $ (0.1 )   $ 0.3     $  (0.4 )
Foreign exchange gains             12.2       2.9         9.3
Other losses                       (0.4 )       -        (0.4 )
Total other income, net          $ 11.7     $ 3.2     $   8.5

Other income, net consists of interest earned on our cash and cash equivalents held on account, accretion of investment earnings and net foreign exchange gains on our foreign denominated cash, cash equivalents and marketable securities. Other gains or losses relate to the issuance and settlement of financial instruments.



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Income Tax Expense

The following is a comparison of income tax expense:



                              Three Months Ended
                                   March 31,
                          2021       2020      Change
                                 (In millions)
Current                  $ (0.3 )   $ (0.1 )   $  (0.2 )
Deferred                    0.4        0.2         0.2
Total tax expense, net   $  0.1     $  0.1     $     -



We are subject to income taxes in the Netherlands and the U.S. Our current and deferred tax provision represents taxable income attributed to our U.S. operations as a consequence of allocating income to that jurisdiction. No current or deferred provision for income taxes has been made for income taxes in the Netherlands due to losses for tax purposes. Further, given a history of losses in the Netherlands, no deferred tax assets in excess of deferred tax liabilities are recognized as it is not more likely than not that they will be recovered.

Net Loss

Net loss for the three months ended March 31, 2021 was $10.2 million, compared to net loss for the three months ended March 31, 2020 of $16.5 million. The change in net loss was primarily due to the change in collaboration revenue, changes in operating expenses and changes in other income, net, as discussed above.

Material Changes in Financial Condition

Sources of Cash

As of March 31, 2021, we had $374.4 million in cash, cash equivalents and marketable securities that are available to fund our current operations. In addition to our existing cash, cash equivalents and marketable securities, we may receive research and development co-funding and are eligible to earn a significant amount of milestone payments under our collaboration agreements and research license agreements. Our ability to earn these payments and the timing of earning these payments is dependent upon the outcome of our research and development activities and is uncertain at this time.

On January 18, 2021, the Company entered into a Collaboration and License Agreement (the "Collaboration Agreement") and Share Subscription Agreement (the "Subscription Agreement") with Eli Lilly and Company, an Indiana corporation ("Eli Lilly"). Eli Lilly has agreed to pay an upfront, non-refundable payment of $40 million, for the rights granted under the Collaboration Agreement within 30 days following the Effective Date. Eli Lilly will fund the research and development activities to be conducted by the Company for each program under an agreed research plan and budget. With respect to each product arising from each program, the Company is eligible to receive up to $290 million in future contingent development and regulatory milestones and up to $250 million in commercial sales milestones, for a total of up to approximately $1.6 billion for a single product generated from all three programs. The Company is further eligible to receive, on a product-by-product and country-by-country basis, tiered royalties based on the level of worldwide aggregate annual net sales at percentages ranging from the mid-single digits to low double digits until the royalty term expires. In connection with entering into the Collaboration Agreement, pursuant to the Subscription Agreement, on January 18, 2021, Eli Lilly agreed to purchase 706,834 common shares of the Company at a price per share of $28.295 for aggregate gross proceeds to the Company of approximately $20 million. Eli Lilly agreed not to transfer, sell, or otherwise dispose of the Shares for a period of time following the Closing Date, subject to certain customary exceptions.

On January 21, 2021, the Company entered into an underwriting agreement with Jefferies LLC and SVB Leerink LLC, as representatives of the several underwriters named therein (collectively, the "Underwriters"), in connection with the issuance and sale by the Company in a public offering of 4,848,485 common shares of the Company, nominal value €0.09 per share, at a public offering price of $24.75 per share, less underwriting discounts and commissions. The Company also granted the Underwriters an option exercisable for 30 days to purchase up to an additional 727,272 common shares at the public offering price, less underwriting discounts and commissions. On January 21, 2021, the Underwriters exercised this option in full. The closing of the offering occurred on January 25, 2021, resulting in aggregate net proceeds to the Company of $129.4 million.

Funding Requirements

Our primary uses of capital are, clinical trial costs, chemistry manufacturing and control costs to manufacture and supply drug product for our clinical trials, third-party research and development services, laboratory and related supplies, financial services, legal and other regulatory expenses and general overhead costs.

Because our product candidates are in various stages of clinical and pre-clinical development and the outcome of these efforts is uncertain, we cannot estimate the actual amounts necessary to successfully complete the development and commercialization of our



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product candidates or whether, or when, we may achieve profitability. In addition, the magnitude and duration of the COVID-19 pandemic and its impact on our liquidity and future funding requirements is uncertain as of the filing date of this Quarterly Report on Form 10-Q, as the pandemic continues to evolve globally. See "Impact of COVID-19 Pandemic" above and "Risk Factors-Risks Related to Our Business and Industry-The COVID-19 pandemic caused by the novel coronavirus has and may continue to adversely impact our business, including our pre-clinical studies and clinical trials, financial condition and results of operations" in Part II, Item 1A of this Quarterly Report on Form 10-Q for a further discussion of the possible impact of the COVID-19 pandemic on our business.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity or debt financings, collaboration arrangements, license agreements, other business development opportunities with third parties.

Except for any obligations of our collaborators or licensees to make license, milestone or royalty payments under our agreements with them, we do not have any committed external sources of liquidity and currently have no credit facility. To the extent that we raise additional capital through the future sale of equity or debt, the ownership interest of our stockholders may be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our existing common stockholders. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise additional funds through collaboration arrangements, license agreements or other business development opportunities in the future, we may have to relinquish valuable rights to our technologies or intellectual property, future revenue streams or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise any additional funds that may be needed 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.

Outlook

Based on our current operating plan, research and development plans and our timing expectations related to the progress of our programs, we expect that our existing cash, cash equivalents and marketable securities as of March 31, 2021 will fund the Company's operations at least into the second half of 2024, without giving effect to any potential milestone payments we may receive under our collaboration and license agreements. We have based this estimate on assumptions that may prove to be wrong, particularly as the process of testing product candidates in clinical trials is costly and the timing of progress in these trials is uncertain and in light of the uncertainties associated with the magnitude and duration of the COVID-19 pandemic. As a result, we could use our capital resources sooner than we expect.

Cash Flows

The following is a summary of cash flows:





                                                              Three Months Ended
                                                                   March 31,
                                                       2021            2020       Change
                                                                 (In millions)

Net cash provided by (used in) operating activities $ 19.3 $ (25.3 ) $ 44.6 Net cash used in investing activities

                    (2.7 )          (4.0 )       1.3
Net cash provided by financing activities               150.5             0.4       150.1




Net cash provided by operating activities during the three months ended March 31, 2021 increased by $44.6 million as compared to the three months ended March 31, 2020, primarily due to operating cash receipts related to revenue arrangements principally from the receipt of payments received from Lilly of $43.5 million.

Net cash used in investing activities during the three months ended March 31, 2021 principally reflects $20.6 million of purchases of marketable securities partially offset by maturities of marketable securities of $18.1 million. Net cash used in investing activities during the three months ended March 31, 2020 principally reflects $17.1 million of purchases of marketable securities, offset by maturities of marketable securities of $13.3 million.

Net cash provided by financing activities during the three months ended March 31, 2021 increased primarily due to proceeds received from the issuance of common stock of $129.6 million, proceeds from the stock issuance to Lilly of $16.5 million, and an increase in stock option exercise proceeds of $3.8 million.

Critical Accounting Policies and Use of Estimates

Our critical accounting policies are described under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations-Critical Accounting Policies" in our Annual Report on Form 10-K and in Note 2 to our consolidated financial



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statements included in the Annual Report on Form 10-K. As disclosed in Note 2 to our consolidated financial statements included in the Annual Report on Form 10-K, the preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ significantly from those estimates. During the period covered by this Quarterly Report on Form 10-Q, there were no material changes to our critical accounting policies from those discussed in our Annual Report on Form 10-K, other than updating our use of the option pricing model and associated estimates as described in Note 9 to our unaudited condensed consolidated interim financial statements included elsewhere in this Quarterly Report on Form 10-Q.

Recently Adopted Accounting Pronouncements

For detailed information regarding recently issued accounting pronouncements and the expected impact on our condensed consolidated financial statements, see Note 2, Summary of Significant Accounting Policies-Pending Accounting Pronouncements, in the accompanying notes to the unaudited condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q.

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