Company: LBRX
Filing Date: 2025-09-09
Form Type: 8-A12B
Source: 0001193125-25-198793
Chunk: 0

Company: LB PHARMACEUTICALS INC
Filing Date: 2025-09-09
Form: 8-A12B
Chunk 0
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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 LB Pharmaceuticals Inc (Exact name of registrant as specified in its charter)

| Delaware                                                       |     |                          81-1854347 |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification No. |
| One Pennsylvania Plaza, Suite 1025                             
 New York, NY                                                   |     |                               10119 |
| (Address of principal executive offices)                       |     |                           -Zip Code |

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

| Title of each class                       
 to be so registered                       |     | Name of exchange on which      
 each class is to be registered |
| Common Stock, $0.0001 par value per share |     | The Nasdaq Stock Market LLC    |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), 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 effective pursuant to General Instruction A.(d) or (e), check the following box. ☐ If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box. ☐ Securities Act registration statement file number to which this form relates: 333-289812 Securities to be registered pursuant to Section 12(g) of the Act: None (Title of class)

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

A description of the common stock, $0.0001 par value per share, of LB Pharmaceuticals Inc, a Delaware corporation (the
“”), to be registered hereunder is contained in the section titled “Description of Capital Stock” in the prospectus included in the Registrant’s Registration Statement on Form S-1 (File No. 333-289812), initially filed with the Securities and Exchange Commission (the “”) on August 22, 2025, as subsequently amended from time to time (the
“”), and is incorporated herein by reference. Any form of prospectus subsequently filed by the