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): May 3, 2022

Cellectar Biosciences, Inc.

(Exact name of Registrant as Specified in its Charter)

100 Campus Drive, Florham Park, NJ, 07932

(Address of principal executive offices, and zip code)

(608) 441-8120

(Registrant’s telephone number, including 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 (see General Instruction A.2. below):

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. ¨

On May 3, 2022, the Company received a written letter (the “Extension Notice”) from Listing Qualifications Staff of The Nasdaq Stock Market, LLC (“Nasdaq”) notifying the Company that Nasdaq has granted the Company an additional 180 calendar days, or until October 31, 2022 (the “Extension Period”), to regain compliance with the requirement for the Company’s common stock to maintain a minimum bid price of $1.00 per share for continued listing on the Nasdaq Capital Market, as set forth in Nasdaq Listing Rule 5550(a)(2) (the “Minimum Bid Price Requirement”).

The Extension Notice has no immediate effect on the continued listing status of the Company’s common stock on the Nasdaq Capital Market. The Company’s common stock remains listed on the Nasdaq Capital Market.

As previously disclosed on the Current Report on Form 8-K filed on November 2, 2021 with the Securities and Exchange Commission, the Company received a written notification from Nasdaq notifying the Company that it had failed to comply with the Minimum Bid Price Requirement because the bid price for the Company’s common stock over a period of 30 consecutive business days prior to such date had closed below the minimum $1.00 per share requirement for continued listing. The notification had no immediate effect on the listing or trading of the common stock on the Nasdaq Capital Market. The Company initially had a period of 180 calendar days, or until May 2, 2022, to regain compliance with the Minimum Bid Price Requirement.

If at any time before October 31, 2022, the bid price of the Company’s common stock closes at or above $1.00 per share for a minimum of 10 consecutive business days, Nasdaq will provide written notification that the Company has achieved compliance with the Rule. If compliance with the Rule cannot be demonstrated by October 31, 2022, Nasdaq will provide written notification that the Company’s common stock will be delisted. At that time, the Company may appeal Nasdaq’s determination to a Hearings Panel.

The Company will continue to monitor the bid price for its common stock and consider various options available to it if its common stock does not trade at a level that is likely to regain compliance. These options include effecting a reverse stock split. There can be no assurance that the Company will regain compliance with the Minimum Bid Price Requirement or maintain compliance with any of the other Nasdaq continued listing requirements.

SIGNATURES

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