Company: LBRX
Filing Date: 2025-07-23
Form Type: DRS/A
Source: 0000950123-25-006557
Chunk: 0

Company: LB PHARMACEUTICALS INC
Filing Date: 2025-07-23
Form: DRS/A
Chunk 0
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As submitted confidentially to the Securities and Exchange Commission on July 23, 2025. This Amendment No. 2 to draft registration statement has not been publicly filed with the Securities and Exchange Commission and all information herein remains strictly confidential. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 LB Pharmaceuticals Inc (Exact Name of Registrant as Specified in Its Charter)

| Delaware                        |     |                         2834 |     | 81-1854347            |
| (State or Other Jurisdiction of 
 Incorporation or Organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

LB Pharmaceuticals Inc One Pennsylvania Plaza, Suite 1025 New York, NY 10119 Tel: (212) 605-0230 (Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices) Heather Turner Chief Executive Officer One Pennsylvania Plaza, Suite 1025 New York, NY 10119 Tel: (212) 605-0230 (Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent for Service) Copies to:

| Divakar Gupta            
 Brandon Fenn Marc        
 Recht Minkyu Park        
 Cooley LLP 55 Hudson     
 Yards New York, NY 10001 
 Tel: (212) 479-6000      |     | Gad Soffer                                        
 Chief Business Officer  One                       
 Pennsylvania Plaza, Suite 1025 New York, NY 10119 
 Tel: (212) 605-0230                               |     | William C. Hicks                                    
 John T. Rudy Alok A.                                
 Choksi Samantha M. Silver                           
 Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. 
 One Financial Center                                
 Boston, MA 02111 Tel: (617)                         
 542-6000                                            |

Approximate date of commencement of proposed sale to the public:As soon as practicable after the effective date of this registration statement. If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. ☐ If this Form is filed to register additional securities for an offering pursuant to Rule 462