Form 8-A12B DoubleLine ETF Trust

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) OR (g) OF

THE SECURITIES EXCHANGE ACT OF 1934

DOUBLELINE ETF TRUST

(Exact name of registrant as specified in its charter)

2002 North Tampa Street

Suite 200

Tampa, Florida 33602

(Address of principal executive offices, including zip code)

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

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective upon filing pursuant to General Instruction A.(c), please check the following box. ☒:

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is to become effective pursuant to General Instruction A.(d), please check the following box. ☐:

Securities Act registration statement file number to which this form relates:

333-260030

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

None.

INFORMATION REQUIRED IN REGISTRATION STATEMENT

Item 1. Description of Registrant’s Securities to be Registered.

A description of the shares is set forth in Post-Effective Amendment No. 15 to the Registrant’s Registration Statement on Form N-1A (the “Registration Statement”) (File Nos. 333-260030; 811-23746), as filed with the U.S. Securities and Exchange Commission (the “SEC”) via EDGAR on November 12, 2025, which description is incorporated herein by reference. Any form of supplement to the Registration Statement that is subsequently filed with the SEC that relates to the shares is hereby also incorporated herein by reference.

Item 2. Exhibits.

SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.