UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549  

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): December 14, 2022

Y-MABS THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

230 Park Avenue

Suite 3350

New York, New York 10169

(Address of principal executive offices) (Zip Code)

(646) 885-8505

(Registrant’s telephone number, include area code)

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 7.01 Regulation FD Disclosure.

On December 14, 2022, Y-mAbs Therapeutics, Inc. (the “Company”) issued a press release regarding clinical updates for the Company’s naxitamab and SADA technology programs, which will be discussed at its previously announced annual Research and Development Day. The Company will host its annual Research and Development Day in person and via conference call and live webcast at 9:00 a.m., Eastern Time, on December 14, 2022. A live audio webcast of the presentation will be available on LifeSci Events’ website at https://lifescievents.com/event/y-mabs-therapeutics-in-person-research-development-day/. The presentation used during the webcast will also be archived on the Company’s website under the Presentations tab under the heading “For Investors”, (https://ir.ymabs.com/events-and-presentations/presentations) for at least 30 days following the call.

A copy of the above-referenced press release is attached hereto as Exhibits 99.1, and are hereby incorporated by reference.

The information in this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing. The Company’s and LifeSci’s website and the information contained on, or that can be accessed through, such websites will not be deemed to be incorporated by reference in, and are not considered part of, this Current Report.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.