Company: SION
Filing Date: 2025-01-17
Form Type: S-1
Source: 0001193125-25-008474
Chunk: 127

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-01-17
Form: S-1
Chunk 127
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 cover page of this prospectus, before deducting underwriting discounts, placement agent fees and commissions and estimated offering expenses payable by us.

|                                                  |     | Shares Purchased                                         
 Number                                                   
 (in thousands, except share, per share and percent data) |            |     | Percentage |       |   |     | Total Consideration 
 Amount              |         |     | Percentage |       |   |     | Weighted- 
 Average   
 Price Per 
 Share     |      |
|:-------------------------------------------------|:----|:---------------------------------------------------------|-----------:|:----|:-----------|------:|:--|:----|:--------------------|--------:|:----|:-----------|------:|:--|:----|:----------|-----:|
| Existing stockholders before this offering       |     |                                                          | 46,481,764 |     |            |       | % |     | $                   | 330,537 |     |            |       | % |     | $         | 7.11 |
| New investors purchasing shares in this offering |     |                                                          |            |     |            |       | % |     |                     |         |     |            |       | % |     | $         |      |
| Total                                            |     |                                                          |            |     |            | 100.0 | % |     | $                   |         |     |            | 100.0 | % |     |           |      |

Each $1.00 increase or decrease, as applicable, in the assumed initial public offering price of $ per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, would increase or decrease, as applicable, the total consideration paid by new investors by $ million and, in the case of an increase, would increase the percentage of total consideration paid by new investors to % and, in the case of a decrease, would decrease the percentage of total consideration paid by new investors to %, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same. Similarly, each increase or decrease, as applicable, of 1.0 million shares in the number of shares offered by us, would increase or decrease, as applicable, the total consideration paid by new investors by $ million and, in the case of an increase, would increase the percentage of total consideration paid by new investors to % and, in the case of a decrease, would decrease