Company: LBRX
Filing Date: 2025-08-22
Form Type: S-1
Source: 0001193125-25-186467
Chunk: 333

Company: LB PHARMACEUTICALS INC
Filing Date: 2025-08-22
Form: S-1
Chunk 333
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 or indirectly:

| • |     | offer, pledge, sell or contract to sell any common stock; |

| • |     | sell any option or contract to purchase any common stock; |

| • |     | purchase any option or contract to sell any common stock; |

| • |     | grant any option, right or warrant for the sale of any common stock; |

| • |     | otherwise dispose of or transfer any common stock; |

| • |     | request or demand that we file a registration statement related to the common stock; or |

| • |     | enter into any swap or other agreement or any transaction that transfers, in whole or in part, the economic                                                                     
 consequence of ownership of any common stock, whether any such swap, agreement or transaction is to be settled by delivery of shares or other securities, in cash or otherwise. |

The lock-upprovisions apply to common stock and to securities convertible into or exchangeable or exercisable for common stock. They also apply to common stock owned now or acquired later by the person executing the lock-upagreement or for which the person executing the lock-upagreement later acquires the power of disposition. Nasdaq Global Market Listing We have applied to list our common stock on the Nasdaq Global Market, subject to notice of issuance, under the symbol “LBRX.” Determination of Offering Price Prior to this offering, there has been no public market for our common stock. The initial public offering price for our common stock will be determined through negotiations between us and the representatives. In addition to prevailing market conditions, the factors to be considered in determining the initial public offering price are:

| • |     | the valuation multiples of publicly traded companies that the representatives believe to be comparable to us; |

| • |     | our financial information; |

| • |     | the history of, and the prospects for, our company and the industry in which we compete; |

| • |     | an assessment of our management, its past and present operations, and the prospects for, and timing of, our 
 future revenues;                                                                                            |

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| • |     | the present state of our development; and |

| • |     | the above factors in relation to market values and various valuation measures of other companies engaged in 
 activities similar to ours.                                                                                 |

An active trading market for the shares may not develop. It is also possible that after this offering, our common stock will not trade in the public market at or above the initial public offering price. The