Company: LBRX
Filing Date: 2025-09-11
Form Type: S-8
Source: 0001193125-25-200401
Chunk: 1

Company: LB PHARMACEUTICALS INC
Filing Date: 2025-09-11
Form: S-8
Chunk 1
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 Act. ☐

PART I INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS The information called for by Part I of Form S-8is omitted from this Registration Statement in accordance with Rule 428 of the Securities Act of 1933, as amended (the “Securities Act”) and the instructions to Form S-8.In accordance with the rules and regulations of the Securities and Exchange Commission (the “Commission”) and the instructions to Form S-8,such documents are not being filed with the Commission either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities Act. PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

| Item 3. | Incorporation of Documents by Reference. |

The Registrant hereby incorporates by reference into this Registration Statement the following documents previously filed by the Registrant with the Commission:

| (a) | Amendment No.                                                                                                                                             
 1 to the Registrant’s Registration Statement on Form S-1 filed with the Commission on September 8, 2025                                                   
 (File No. 333-289812), which contains the audited financial statements for the Registrant’s latest fiscal year for which such statements have been filed; |

| (b) | The Registrant’s prospectus to be filed with the Commission on or about September 11, 2025 pursuant                            
 to Rule 424(b) of the Securities Act relating to the Registration Statement on Form S-1, as amended (File No. 333-289812); and |

| (c) | The description of the Registrant’s Common Stock contained in the Registrant’s Registration                                                                                          
 Statement on Form 8-A filed on September 9, 2025 (File                                                                                                                               
 No. 001-42831) under Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), including any amendment or report filed for the purpose of updating such 
 description.                                                                                                                                                                         |

All documents filed by the Registrant pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Registration Statement and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference into this Registration Statement and to be a part hereof from the date of filing of such documents; provided, however, that documents or