UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number 001-38370

CollPlant Biotechnologies Ltd.

(Exact name of registrant as specified in its charter)

4 Oppenheimer St, Weizmann Science Park

Rehovot 7670104, Israel

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒         Form 40-F ☐

This Form 6-K, including the press release attached to this Form 6-K as Exhibit 99.1, is hereby incorporated by reference into the registrant’s Registration Statements on Form S-8 (File No. 333-229163, 333-248479, 333-263842, 333-271320 and 333-279791) and Form F-3 (File No. 333-238731, 333-292640 and 333-297347), to be a part thereof from the date on which this report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

CollPlant Biotechnologies Ltd. (the “Company”) is announcing that it will effect a reverse share split of the Company’s ordinary shares at the ratio of 1-for-10, such that each ten (10) ordinary shares, no par value, shall be consolidated into one (1) ordinary share, no par value. The first date when the Company’s ordinary shares will begin trading on the Nasdaq Capital Market after implementation of the reverse split will be Friday, September 4, 2026.

No fractional ordinary shares will be issued as a result of the reverse split. All fractional ordinary shares will be rounded to the nearest whole ordinary share. In addition, a proportionate adjustment will be made to the per share exercise price and the number of shares issuable upon the exercise of all outstanding warrants and options entitling the holders to purchase ordinary shares. The new CUSIP number for the ordinary shares will be M2R51X124.

On September 1, 2026, the Company issued a press release titled “Collplant Announces Reverse Share Split.” A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Attached hereto and incorporated by reference herein are the following exhibits:

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, thereunto duly authorized.