Exhibit 99.1 

Y-mAbs Reports Fourth Quarter and Full Year 2021 Financial Results and Recent Corporate Developments

New York, NY, February 24, 2022 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today reported financial results for the fourth quarter and the full year ended December 31, 2021 and provided recent corporate highlights.

"In recent months, we have achieved significant progress on the omburtamab BLA, which we expect to resubmit to the FDA by the end of the first quarter of 2022,” said Dr. Claus Moller, Chief Executive Officer. “We believe we now have a clear regulatory path in place and are one step closer to our goal of delivering omburtamab to children suffering from high-risk neuroblastoma brain tumors. In parallel, we are continuing to advance SADA, our novel platform for targeted radioisotope delivery that can potentially be adapted to various tumor targets. We filed an IND for GD2-SADA, the first SADA construct for potential use in GD2 positive solid tumors and are now accelerating pre-clinical testing with plans to submit at least one IND per year for additional SADA targets. In the meantime, we are actively pursuing additional collaboration and partnership opportunities.”

“We are very pleased with our 2021 financial results, especially with our continued execution of the DANYELZA commercial launch, which generated revenues of $32.9 million in its first year,” said Thomas Gad, Founder, Chairman and President. “We continue to be focused on our oncology programs, supported by a strong balance sheet. We ended the year with $181.6 million in cash, that is anticipated to support us through multiple potentially value-creating catalysts by the end of 2023. We believe that we are well-positioned to elevate our business and we expect that 2022 will be another productive year for Y-mAbs.”

Fourth Quarter 2021 and Recent Corporate Developments

Financial Results

Revenues

Y-mAbs reported net revenue of $34.9 million for the year ended December 31, 2021, which consisted of product revenues of $32.9 million, generated from sales of DANYELZA, our first FDA approved product, and licensing revenues of $2.0 million related to a licensing agreement in Latin America. The gross margin for product revenues was 93% in 2021. Y-mAbs reported net revenues of $20.8 million for the year ended December 31, 2020, related to its licensing agreements in China and Israel. Y-mAbs did not have product revenues for the year ended December 31, 2020, as DANYELZA was not approved by the FDA until late November 2020.

For the fourth quarter of 2021, Y-mAbs incurred net revenues of $9.6 million, which consisted of product revenues from the sales of DANYELZA. Sales were up 7.1% from the third quarter 2021, and we have now delivered DANYELZA to 28 centers across the nation, an increase of four centers since the third quarter 2021. Treatment centers outside MSK accounted for approximately 40% of the product revenues during the fourth quarter of 2021. Y-mAbs incurred net revenues of $20.8 million for the quarter ending December 31, 2020, related to its licensing agreements in China and Israel.

Operating Expenses

Research and Development

Y-mAbs is anticipating a BLA resubmission for omburtamab by the end of the first quarter 2022 and at the same time, the Company is advancing its antibody constructs through the clinic; predominantly DANYELZA, omburtamab, and the SADA constructs. Research and development expenses were $93.2 million for the twelve months ended December 31, 2021, compared to $93.7 million for the twelve months ended December 31, 2020. The $0.5 million decrease in research and development expenses primarily reflects the following main items:

The decreases mentioned above were partially offset by the following increases:

Selling, General, and Administration

Selling, general, and administrative expenses were $54.6 million for the twelve months ended December 31, 2021, compared to $44.8 million for the twelve months ended December 31, 2020, corresponding to an increase of $9.8 million. The increase in selling, general, and administrative expenses was primarily due to a $8.9 million increase in personnel costs, partly associated with the expansion of our commercial team that is poised to drive further adoption of DANYELZA in 2022.

Net Result

Y-mAbs reported a net loss of $55.3 million, or ($1.28) per basic and diluted share, for the year ended December 31, 2021, compared to a net loss of $119.3 million, or ($2.97) per basic and diluted share, reported for the year ended December 31, 2020. The decrease in net loss was primarily caused by the sale in January 2021 of the priority review voucher received upon the approval of DANYELZA and the DANYELZA revenues generated in 2021, partially offset by increases in operating expenses related to the commercialization of DANYELZA in the United States.

For the quarter ended December 31, 2021, Y-mAbs incurred a net loss of $36.9 million, or ($0.85) per basic and diluted share, which compares to a net loss of $19.9 million, or ($0.48) per basic and diluted share, incurred for the quarter ended December 31, 2020. The increase in net loss was primarily caused by the DANYELZA revenues in 2021 not fully offsetting the licensing income in the fourth quarter of 2020.

Cash and Cash Equivalents

The Company had approximately $181.6 million in cash and cash equivalents as of December 31, 2021.

Webcast and Conference Call

The Company will host a conference call on Friday, February 25, 2022, at 9 a.m. Eastern Time. To participate in the call, please dial 877-407-0792 (domestic) or 201-689-8263 (international) and reference the conference ID 13726652.

A webcast will be available at: https://viavid.webcasts.com/starthere.jsp?ei=1526062&tp_key=59e1f9cc51

About Y-mAbs

Y-mAbs is a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic cancer products. In addition to conventional antibodies, the Company’s technologies include bispecific antibodies generated using the Y-BiClone platform and the SADA platform. The Company’s broad and advanced product pipeline includes one FDA-approved product, DANYELZA (naxitamab-gqgk), which targets tumors that express GD2, and one product candidate at the registration-stage, omburtamab, which targets tumors that express B7-H3.

Forward-Looking Statements

Statements in this press release about future expectations, plans and prospects, as well as any other statements regarding matters that are not historical facts, may constitute “forward-looking statements” within the meaning of The Private Securities Litigation Reform Act of 1995. Such statements include, but are not limited to, statements about our business model and development, commercialization and product distribution plans; current and future clinical and pre-clinical studies and our research and development programs; expectations related to the timing of the initiation and completion of regulatory submissions; regulatory, marketing and reimbursement approvals; rate and degree of market acceptance and clinical utility as well as pricing and reimbursement levels; retaining and hiring key employees; our commercialization, marketing and manufacturing capabilities and strategy; our intellectual property position and strategy; additional product candidates and technologies; collaborations or strategic partnerships and the potential benefits thereof; expectations related to the use of our cash and cash equivalents, and the need for, timing and amount of any future financing transaction; our financial performance, including our estimates regarding revenues, expenses, capital expenditure requirements; developments relating to our competitors and our industry; and other statements that are not historical facts. Words such as ‘‘anticipate,’’ ‘‘believe,’’ “contemplate,” ‘‘continue,’’ ‘‘could,’’ ‘‘estimate,’’ ‘‘expect,’’ “hope,” ‘‘intend,’’ ‘‘may,’’ ‘‘might,’’ ‘‘plan,’’ ‘‘potential,’’ ‘‘predict,’’ ‘‘project,’’ ‘‘should,’’ ‘‘target,’’ “will”, ‘‘would’’ and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Our product candidates and related technologies are novel approaches to cancer treatment that present significant challenges. Actual results may differ materially from those indicated by such forward-looking statements as a result of various factors, including but not limited to: risks associated with our financial condition and need for additional capital; risks associated with our development work; cost and success of our product development activities and clinical trials; the risks of delay in the timing of our regulatory submissions or failure to receive approval of our drug candidates; the risks related to commercializing any approved pharmaceutical product including the rate and degree of market acceptance of our product candidates; development of our sales and marketing capabilities and risks associated with failure to obtain sufficient reimbursement for our products; the risks related to our dependence on third parties including for conduct of clinical testing and product manufacture; our inability to enter into partnerships; the risks related to government regulation; risks related to market approval, risks associated with protection of our intellectual property rights; risks related to employee matters and managing growth; risks related to our common stock, risks associated with the pandemic caused by the coronavirus known as COVID-19 and other risks and uncertainties affecting the Company including those described in the "Risk Factors" section included in our Annual Report on Form 10-K and in our other SEC filings. Any forward-looking statements contained in this press release speak only as of the date hereof, and the Company undertakes no obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise.

“DANYELZA” and “Y-mAbs” are registered trademarks of Y-mAbs Therapeutics, Inc.

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Y-MABS THERAPEUTICS, INC.

Consolidated Balance Sheets

(unaudited)

(in thousands, except share data)