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– Petosemtamab in combination with pembrolizumab interim data presented at 2024 ASCO® demonstrated robust 67% response rate among 24 evaluable patients – First patients dosed in phase 3 trial evaluating petosemtamab monotherapy in 2/3L HNSCC, phase 2 trial evaluating petosemtamab in combination with standard chemotherapy in 2L mCRC, and phase 2 trial evaluating MCLA-129 in combination with chemotherapy in 2L+ EGFRm NSCLC – Based on the Company’s current operating plan, existing cash, cash equivalents, including successful public offering raising $460M gross proceeds, and marketable securities expected to fund Merus’ operations into 2028 UTRECHT, The Netherlands and CAMBRIDGE, Mass., Aug. 01, 2024 (GLOBE NEWSWIRE) -- Merus N.V. (Nasdaq: MRUS) (Merus, the Company, we, or our), a clinical-stage oncology company developing innovative, full-length multispecific antibodies (Biclonics® and Triclonics®), today announced financial results for the second quarter and provided a business update. “Petosemtamab has already demonstrated potential for best in class efficacy with a favorable safety profile in both 1L and 2L+ HNSCC, major areas of unmet medical need. I’m also looking forward to evaluating petosemtamab in mCRC, another potential important opportunity,” said Bill Lundberg, M.D., President, Chief Executive Officer of Merus. “With the addition of Dr. Fabian Zohren as CMO and the recent successful equity financing raising $460M gross proceeds, we are well positioned for our ambitious phase 3 trial plans for petosemtamab in HNSCC and beyond.” Petosemtamab (MCLA-158: EGFR x LGR5 Biclonics®): Solid TumorsLiGeR-HN2 phase 3 trial in 2/3L head and neck squamous cell carcinoma (HNSCC) enrolling and LiGeR-HN1 phase 3 trial in 1L HNSCC planned to initiate by year end 2024; phase 2 trial in 2L metastatic colorectal cancer (mCRC) enrolling; clinical data update on 2L+ HNSCC planned for late fourth quarter of 2024 Merus has confirmed through feedback with the U.S. Food and Drug Administration (FDA) that petosemtamab 1500 mg every two weeks is appropriate for further development in HNSCC as monotherapy, and in combination with pembrolizumab. Merus provided an interim clinical update on petosemtamab with pembrolizumab in 1L HNSCC at the 2024 American Society of Clinical Oncology® (ASCO®) Annual Meeting, demonstrating a 67% response rate among 24 evaluable patients. The oral presentation was detailed in our press release, Merus’ Petosemtamab in Combination with Pembrolizumab Interim Data Demonstrates Robust Response Rate and Favorable Safety Profile in 1L r/m (recurrent/metastatic) HNSCC (May 28, 2024). Merus plans to initiate LiGeR-HN1, a phase 3 trial evaluating petosemtamab in combination with pembrolizumab in 1L HNSCC by year end 2024. Merus provided an interim clinical update on petosemtamab monotherapy in 2L+ HNSCC at the American Association of Cancer Research® (AACR®) Annual Meeting 2023, demonstrating a 37% response rate among 43 evaluable patients. The oral presentation was detailed in our press release Merus’ Petosemtamab Interim Data Demonstrates Clinically Meaningful Activity in Previously Treated Head and Neck Squamous Cell Carcinoma (HNSCC) (April 17, 2023). Merus plans to provide updated efficacy, durability and safety data of this cohort along with clinical data from the dose optimization cohort evaluating petosemtamab monotherapy 1500 or 1100 mg dose levels in 2L+ HNSCC in late fourth quarter of 2024. Merus announced the first patient was dosed in LiGeR-HN2, a phase 3 trial evaluating the efficacy and safety of petosemtamab in 2/3L HNSCC compared to standard of care. In this trial, patients will be randomized to petosemtamab monotherapy or investigator’s choice of single agent chemotherapy or cetuximab. This was detailed in our press release, Merus Announces First Patient Dosed in LiGeR-HN2, a Phase 3 Trial Evaluating Petosemtamab in 2/3L r/m HNSCC - Merus (July 24, 2024). The FDA has granted Breakthrough Therapy Designation (BTD) for petosemtamab for the treatment of patients with recurrent or metastatic HNSCC whose disease has progressed following treatment with platinum based chemotherapy and an anti-programmed cell death receptor-1 (PD-1) or anti-programmed death ligand 1 (PD-L1) antibody. This designation was detailed in our press release, Petosemtamab granted Breakthrough Therapy Designation by the U.S. FDA (May 13, 2024). Merus believes a randomized registration trial in HNSCC with an overall response rate endpoint could potentially support accelerated approval and the overall survival results from the same study could potentially verify its clinical benefit to support regular approval. Merus announced the first patient was dosed in the phase 2 open-label trial evaluating the safety and preliminary antitumor activity of petosemtamab with FOLFIRI in 2L mCRC. Trial design was detailed in our press release Merus Announces First Patient Dosed in Phase 2 Trial of Petosemtamab in 2L CRC (July 8, 2024). Zenocutuzumab (Zeno or MCLA-128: HER2 x HER3 Biclonics®): NRG1 fusion-positive (NRG1+) lung, pancreatic and other solid tumorsZeno BLA for treatment of NRG1+ non-small cell lung cancer (NSCLC) and pancreatic cancer (PDAC) accepted for priority review by the FDA The FDA has accepted for priority review a Biologics License Application (BLA) for the bispecific antibody zenocutuzumab (Zeno) in patients with NRG1+ NSCLC and PDAC cancer. This acceptance was detailed in our press release Merus Announces U.S. FDA Acceptance and Priority Review of Biologics License Application for Zeno for the Treatment of NRG1+ NSCLC and PDAC (May 6, 2024). Merus believes that obtaining a commercialization partnership agreement is an important step in bringing Zeno to patients with NRG1+ cancer, if approved. MCLA-129 (EGFR x c-MET Biclonics®): Solid TumorsInvestigation of MCLA-129 is ongoing in METex14 NSCLC; phase 2 trial in combination with chemotherapy in 2L+ EGFR mutant (EGFRm) NSCLC enrolling At 2024 ASCO® Merus presented efficacy and safety data of MCLA-129, in NSCLC with c-MET exon 14 skipping mutations (METex14). This poster presentation was detailed in our press release Merus’ MCLA-129 Demonstrates Promising Single-Agent Efficiency in METex14 NSCLC in Poster Presentation at the 2024 ASCO® Annual Meeting (June 3, 2024). The first patients were dosed in the phase 2 trial evaluating MCLA-129 in combination with chemotherapy in 2L+ EGFRm NSCLC, with a cohort receiving MCLA-129 and paclitaxel and carboplatin, and another cohort receiving MCLA-129 and docetaxel. We also remain interested in partnering MCLA-129 to sufficiently resource the development of MCLA-129 and the potential benefit it may have for patients. MCLA-129 is subject to a collaboration and license agreement with Betta Pharmaceuticals Co. Ltd. (Betta), which permits Betta to develop MCLA-129 and potentially commercialize exclusively in China, while Merus retains global rights outside of China. MCLA-145 (CD137 x PD-L1 Biclonics®): Solid Tumors Investigation continues of the phase 1 trial of MCLA-145 in combination with pembrolizumab Interim clinical data on MCLA-145 monotherapy and in combination with pembrolizumab in patients with advanced/metastatic solid tumors were presented at 2024 ASCO®. The oral presentation was detailed in our press release Merus Presents Interim Data on MCLA-145 Monotherapy and in Combination with Pembrolizumab at the 2024 ASCO® Annual Meeting (June 2, 2024). Company News Merus announced the appointment of Fabian Zohren M.D., Ph.D. as Chief Medical Officer (CMO). This management addition is detailed in our press release Merus Appoints Fabian Zohren M.D., Ph.D., as Chief Medical Officer (July 1, 2024). Collaborations Incyte CorporationSince 2017, Merus has been working with Incyte Corporation (Incyte) under a global collaboration and license agreement focused on the research, discovery and development of bispecific antibodies utilizing Merus’ proprietary Biclonics® technology platform. For each program under the collaboration, Merus receives reimbursement for research activities and is eligible to receive potential development, regulatory and commercial milestones and sales royalties for any products, if approved. During the second quarter of 2024, Merus received the milestone payment of $1 million for the candidate nomination accomplished in first quarter of 2024. Eli Lilly and CompanyIn January 2021, Merus and Eli Lilly and Company (Lilly), announced a research collaboration and exclusive license agreement to develop up to three CD3-engaging T-cell re-directing bispecific antibody therapies utilizing Merus’ Biclonics® platform and proprietary CD3 panel along with the scientific and rational drug design expertise of Lilly. The collaboration is progressing well with three programs ongoing at various stages of preclinical development. Gilead SciencesIn March 2024, Merus and Gilead Sciences announced a collaboration to discover novel antibody based trispecific T-cell engagers using Merus’ patented Triclonics® platform. Under the terms of the agreement, Merus will lead early-stage research activities for two programs, with an option to pursue a third. Gilead will have the right to exclusively license programs developed under the collaboration after the completion of select research activities. If Gilead exercises its option to license any such program from the collaboration, Gilead will be responsible for additional research, development and commercialization activities for such program. Merus received an equity investment by Gilead of $25 million in Merus common shares and an upfront payment of $56 million. Corporate ActivitiesCompleted public offering raising $460M gross proceedsThis equity raise is detailed in a press release: Merus Announces Pricing of Upsized Public Offering of Common Shares (May 29, 2024). Cash Runway, existing cash, cash equivalents and marketable securities expected to fund Merus’ operations into 2028 As of June 30, 2024, Merus had $846.4 million cash, cash equivalents and marketable securities. Based on the Company’s current operating plan, the existing cash, cash equivalents and marketable securities are expected to fund Merus’ operations into 2028. Second Quarter 2024 Financial ResultsWe ended the second quarter with cash, cash equivalents and marketable securities of $846.4 million compared to $411.7 million at December 31, 2023. Collaboration revenue for the three months ended June 30, 2024 decreased by $3.2 million as compared to the three months ended June 30, 2023, primarily as a result of decreases in reimbursement revenue of $1.5 million and amortization of deferred revenue of $1.7 million. Research and development expense for the three months ended June 30, 2024 increased by $20.8 million as compared to the three months ended June 30, 2023, primarily as a result of increases in external clinical services and drug manufacturing expenses, including costs to fulfill our obligations under our collaboration agreements, related to our programs of $16.2 million, consulting expenses of $2.2 million, facilities and depreciation expenses of $1.2 million, personnel related expenses including share-based compensation of $1.0 million, consumables expenses of $0.1 million, and travel expenses of $0.1 million. General and administrative expense for the three months ended June 30, 2024 increased by $6.5 million as compared to the three months ended June 30, 2023, primarily as a result of increases in personnel related expenses including share-based compensation of $3.7 million, consulting expenses of $3.6 million, intellectual property and license expenses of $0.5 million, and legal expenses of $0.4 million, partially offset by decreases in facilities and depreciation expense of $1.2 million, travel expenses of $0.3 million, and finance and human resources expenses of $0.2 million. Collaboration revenue for the six months ended June 30, 2024 decreased by $8.8 million as compared to the six months ended June 30, 2023, primarily as a result of a decrease in reimbursement revenue of $2.2 million, decrease in milestone revenue of $1.5 million and decrease in amortization of deferred revenue of $5.1 million. Research and development expense for the six months ended June 30, 2024 increased by $24.5 million as compared to the six months ended June 30, 2023, primarily as a result of increases in external clinical services and drug manufacturing expenses, including costs to fulfill our obligations under our collaboration agreements, related to our programs of $19.4 million, consulting expenses of $3.7 million, facilities and depreciation expenses of $2.3 million, pre-launch inventory of $0.2 million, and travel expenses of $0.2 million, partially offset by decreases in personnel related expenses including share-based compensation of $1.2 million and consumables expenses of $0.1 million General and administrative expense for the six months ended June 30, 2024 increased by $7.3 million as compared to the six months ended June 30, 2023, primarily as a result of increases in personnel related expenses including share-based compensation of $4.5 million, consulting expenses of $3.2 million, legal expenses of $1.0 million, and intellectual property and license expenses of $0.8 million, partially offset by decreases in facilities and depreciation expense of $1.7 million, travel expenses of $0.3 million, and finance and human resources expenses of $0.2 million Other income (loss), net consists of interest earned and fees paid on our cash and cash equivalents held on account, accretion of investment earnings and net foreign exchange (losses) gains on our foreign denominated cash, cash equivalents and marketable securities. Other gains or losses relate to the issuance and settlement of financial instruments. MERUS N.V.CONDENSED CONSOLIDATED BALANCE SHEETS(UNAUDITED)(Amounts in thousands, except share and per share data) June 30, 2024 December 31, 2023 ASSETS Current assets: Cash and cash equivalents$629,475 $204,246 Marketable securities 157,948 150,130 Accounts receivable 1,842 2,429 Prepaid expenses and other current assets 17,288 12,009 Total current assets 806,553 368,814 Marketable securities 58,961 57,312 Property and equipment, net 12,090 12,135 Operating lease right-of-use assets 10,291 11,362 Intangible assets, net 1,658 1,800 Deferred tax assets 543 1,199 Other assets 2,132 2,872 Total assets$892,228 $455,494 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Accounts payable$4,395 $4,602 Accrued expenses and other liabilities 40,826 38,482 Income taxes payable 1,605 1,646 Current portion of lease obligation 1,688 1,674 Current portion of deferred revenue 32,350 22,685 Total current liabilities 80,864 69,089 Lease obligation 9,332 10,488 Deferred revenue, net of current portion 55,260 19,574 Total liabilities 145,456 99,151 Commitments and contingencies - Note 6 Shareholders’ equity: Common shares, €0.09 par value; 105,000,000 shares authorized at June 30, 2024 and December 31, 2023; 67,852,920 and 57,825,879 shares issued and outstanding as at June 30, 2024 and December 31, 2023, respectively 6,863 5,883 Additional paid-in capital 1,616,367 1,126,054 Accumulated other comprehensive income (38,899) (22,533)Accumulated deficit (837,559) (753,061)Total shareholders’ equity 746,772 356,343 Total liabilities and shareholders’ equity$892,228 $455,494 MERUS N.V.CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS(UNAUDITED)(Amounts in thousands, except share and per share data) Three Months EndedJune 30, Six Months EndedJune 30, 2024 2023 2024 2023 Collaboration revenue$7,332 $10,476 $15,221 $23,975 Total revenue 7,332 10,476 15,221 23,975 Operating expenses: Research and development 49,119 28,298 87,703 63,163 General and administrative 22,587 16,063 38,701 31,449 Total operating expenses 71,706 44,361 126,404 94,612 Operating loss (64,374) (33,885) (111,183) (70,637)Other income, net: Interest income, net 7,130 2,795 12,047 4,790 Foreign exchange gains (loss) 9,519 551 18,053 (4,890)Total other income (loss), net 16,649 3,346 30,100 (100) Net loss before income taxes (47,725) (30,539) (81,083) (70,737)Income tax expense 2,317 1,494 3,415 1,037 Net loss$(50,042) $(32,033) $(84,498) $(71,774)Other comprehensive loss: Currency translation adjustment (8,978) (505) (16,366) 3,737 Comprehensive loss$(59,020) $(32,538) $(100,864) $(68,037)Net loss per share attributable to common stockholders: Basic and diluted$(0.81) $(0.66) $(1.41) $(1.52)Weighted-average common shares outstanding: Basic and diluted 61,851,260 48,321,708 59,968,338 47,328,259 About Merus N.V. Merus is a clinical-stage oncology company developing innovative full-length human bispecific and trispecific antibody therapeutics, referred to as Multiclonics®. Multiclonics® are manufactured using industry standard processes and have been observed in preclinical and clinical studies to have several of the same features of conventional human monoclonal antibodies, such as long half-life and low immunogenicity. For additional information, please visit Merus’ website, and LinkedIn. Forward-Looking StatementsThis press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including without limitation, statements regarding the content and timing of clinical trials, data readouts and clinical, regulatory, strategy and development updates for our product candidates; our ability to successfully advance Zeno through the regulatory, BLA review and potential commercialization processes; our planned initiation of LiGeR-HN1 by year-end, our planned update by late 4Q 2024 on the HNSCC 2L+ dose cohort and patients previously reported at AACR2023; the potential of petosetmamab for best in class efficacy with a favorable safety profile in both 1L and 2L+ HNSCC; the potential opportunity of petosemtamab being investigated in 2L mCRC in combination with FOLFIRI; our belief that we are well positioned for our ambitious phase 3 trial plans for petosemtamab in HNSCC and beyond; the potential future benefit if any for the receipt of BTD for petosemtamab for the treatment of patients with recurrent or metastatic HNSCC whose disease has progressed following treatment with platinum based chemotherapy and an anti-programmed cell death receptor-1 (PD-1) or anti-programmed death ligand 1 (PD-L1) antibody; our belief that a randomized registration trial in HNSCC with an overall response rate endpoint could potentially support accelerated approval and the overall survival results from the same study could potentially verify its clinical benefit to support regular approval; our belief that obtaining a commercialization partnership agreement is an important step in bringing Zeno to patients with NRG1+ cancer, if approved; statements regarding the sufficiency of our cash, cash equivalents and marketable securities, and expectation that it will fund the Company into 2028; the continued investigation of MCLA-145 in combination with pembrolizumab; the advancement of the phase 1/2 trial for MCLA-129 in the dose expansion phase, in monotherapy in Met ex14 NSCLC, and MCLA-129 in combination with chemotherapy in 2L+ EGFRm NSCLC; the benefits of the collaborations between Incyte and Merus, Lilly and Merus, Gilead and Merus, and the potential of those collaboration for future value generation, including whether and when Merus will receive any future payment under the collaborations, including milestones or royalties, and the amounts of such payments; whether any programs under the collaboration will be successful; and our collaboration and license agreement with Betta, which permits Betta to develop MCLA-129 and potentially commercialize exclusively in China, while Merus retains full ex-China rights, including any future clinical development by Betta of MCLA-129. These forward-looking statements are based on management’s current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: our need for additional funding, which may not be available and which may require us to restrict our operations or require us to relinquish rights to our technologies or antibody candidates; potential delays in regulatory approval, which would impact our ability to commercialize our product candidates and affect our ability to generate revenue; the lengthy and expensive process of clinical drug development, which has an uncertain outcome; the unpredictable nature of our early stage development efforts for marketable drugs; potential delays in enrollment of patients, which could affect the receipt of necessary regulatory approvals; our reliance on third parties to conduct our clinical trials and the potential for those third parties to not perform satisfactorily; impacts of the volatility in the global economy, including global instability, including the ongoing conflicts in Europe and the Middle East; we may not identify suitable Biclonics® or bispecific antibody candidates under our collaborations or our collaborators may fail to perform adequately under our collaborations; our reliance on third parties to manufacture our product candidates, which may delay, prevent or impair our development and commercialization efforts; protection of our proprietary technology; our patents may be found invalid, unenforceable, circumvented by competitors and our patent applications may be found not to comply with the rules and regulations of patentability; we may fail to prevail in potential lawsuits for infringement of third-party intellectual property; and our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. These and other important factors discussed under the caption “Risk Factors” in our Quarterly Report on Form 10-Q for the period ended June 30, 2024, filed with the Securities and Exchange Commission, or SEC, on August 1, 2024, and our other reports filed with the SEC, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management’s estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change, except as required under applicable law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release. Multiclonics®, Biclonics® and Triclonics® are registered trademarks of Merus N.V.

UTRECHT, The Netherlands and CAMBRIDGE, Mass., June 03, 2024 (GLOBE NEWSWIRE) -- Merus N.V. (Nasdaq: MRUS) (Merus, the Company, we, or our), a clinical-stage oncology company developing innovative, full-length multispecific antibodies (Biclonics® and Triclonics®), today announced the publication of a poster regarding MCLA-129 presented at the 2024 American Society of Clinical Oncology® (ASCO®) Annual Meeting taking place in Chicago May 31-June 4, 2024. “These data continue to support our view that MCLA-129 is a very active drug, and that our Biclonics® platform really can create clinically active drugs for patients with cancer. We plan to start a cohort investigating MCLA-129 in combination with chemotherapy in 2L+ EGFRm NSCLC later this year,” said Bill Lundberg, M.D., President, Chief Executive Officer of Merus. “We continue to evaluate MCLA-129 with a focused investment and remain interested in a partnership to resource the further development of this asset.” Poster presentation title: Efficacy and safety of MCLA-129, an anti-EGFR/c-MET bispecific antibody, in non-small-cell lung cancer (NSCLC) with Hepatocyte Growth Factor Receptor (c-MET) exon 14 skipping mutations (METex14) Observations in the presentation include: As of a February 16, 2024 data cutoff date, 22 patients (pts) were treated and 14 pts (64%) were continuing treatment All the pts received MCLA-129 in monotherapy at the dose of 1500 mg, every 2 weeks Pts received a median of 2 lines of prior therapy 10 pts (45%) were tyrosine kinase inhibitor (TKI)-naïve and 12 (55%) had received prior TKIs 7 pts were excluded from the efficacy population. 4 discontinued due to AEs <2 cycles of treatment and did not experience progressive disease while on study; 3 were ongoing as of the cutoff date with <2 treatment cycles 15 pts were evaluable for response having received ≥2 treatment cycles, measurable disease at baseline and ≥1 post-baseline scan Response rate overall: 3 partial responses (PRs) and 6 unconfirmed PRs (uPRs) were observed by Response Evaluation Criteria in Solid Tumors v1.1 per investigator assessment; 5 of the 6 uPRs were confirmed and 1 uPR progressed after the data cutoff (8/15 confirmed PRs [53%]) 6 of 8 TKI-naïve cancers responded, one of which was an initial uPR that progressed after data cutoff 3 of 7 cancers with prior MET TKI responded Reduction in target lesion tumor size from baseline was demonstrated in 12 pts (80%) Early safety assessment in 22 pts treated with MCLA-129 monotherapy included Infusion related reactions (composite term) in 86% (18% ≥ Grade (G)3) One pt had treatment-related interstitial lung disease (G2) Venous thromboembolism was recorded in 2 pts (1 G3 possibly treatment-related, the other G2 and not related to treatment) The full presentation is available on the Publications page of our website. MCLA-129 is subject to a collaboration and license agreement with Betta Pharmaceuticals Co. Ltd. (Betta), which permits Betta to develop MCLA-129 and potentially commercialize exclusively in China, while Merus retains global rights outside of China. An abstract sponsored by Betta entitled: Efficacy and safety of MCLA-129, an EGFR/c-MET bispecific antibody, in advanced non-small cell lung cancer (NSCLC) was accepted for poster presentation at 2024 ASCO®. About Merus Merus is a clinical-stage oncology company developing innovative full-length human bispecific and trispecific antibody therapeutics, referred to as Multiclonics®. Multiclonics® are manufactured using industry standard processes and have been observed in preclinical and clinical studies to have several of the same features of conventional human monoclonal antibodies, such as long half-life and low immunogenicity. For additional information, please visit Merus’ website, X and LinkedIn. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including without limitation statements regarding the clinical development of our clinical candidates, including MCLA-129, future clinical trial results or interim data, clinical activity and safety profile, and development plans in the on-going trials and described in forthcoming posters or presentations; the ability of our Mutliclonics® platforms; our belief that these data continue to support our view that MCLA-129 is a very active drug for patients with cancer; our plans to start a cohort investigating MCLA-129 in combination with chemotherapy in 2L+ EGFR mutant NSCLC in 2024; and our continued evaluation MCLA-129 with a focused investment and interest in a partnership to resource the further development of this asset. These forward-looking statements are based on management’s current expectations. These forward-looking statements are based on management’s current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: our need for additional funding, which may not be available and which may require us to restrict our operations or require us to relinquish rights to our technologies or Biclonics®, Triclonics® and multispecific antibody candidates; potential delays in regulatory approval, which would impact our ability to commercialize our product candidates and affect our ability to generate revenue; the lengthy and expensive process of clinical drug development, which has an uncertain outcome; the unpredictable nature of our early stage development efforts for marketable drugs; potential delays in enrollment of patients, which could affect the receipt of necessary regulatory approvals; our reliance on third parties to conduct our clinical trials and the potential for those third parties to not perform satisfactorily; impacts of the market volatility; we may not identify suitable Biclonics® or bispecific antibody candidates under our collaborations or our collaborators may fail to perform adequately under our collaborations; our reliance on third parties to manufacture our product candidates, which may delay, prevent or impair our development and commercialization efforts; protection of our proprietary technology; our patents may be found invalid, unenforceable, circumvented by competitors and our patent applications may be found not to comply with the rules and regulations of patentability; we may fail to prevail in potential lawsuits for infringement of third-party intellectual property; and our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. These and other important factors discussed under the caption “Risk Factors” in our Annual Report on Form 10-Q for the quarter ended March 31, 2024 filed with the Securities and Exchange Commission, or SEC, on May 8, 2024, and our other reports filed with the SEC, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management’s estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change, except as required under applicable law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release. Multiclonics®, Biclonics® and Triclonics® are registered trademarks of Merus N.V. Investor and Media Inquiries: Sherri Spear Merus N.V. VP Investor Relations and Corporate Communications 617-821-3246 s.spear@merus.nl Kathleen Farren Merus N.V. IR/Corp Comms 617-230-4165 k.farren@merus.nl