Company: SION
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-101830
Chunk: 57

Company: Sionna Therapeutics, Inc.
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 57
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2,886,293 shares of common stock held by AVF XI and (ii) 807,727 shares of common stock held by AVOF II. Atlas Venture Associates XI, L.P. is the general partner of AVF XI and Atlas Venture Associates XI, LLC is the general partner of Atlas Venture Associates XI, L.P. The members of Atlas Venture Associates XI, LLC collectively make investment decisions on behalf of Atlas Venture Fund XI, LLC. Each of AVF XI, Atlas Venture Associates XI, L.P. and Atlas Venture Associates XI, LLC may be deemed to beneficially own the shares held by AVF XI. Atlas Venture Associates Opportunity II, L.P. is the general partner of AVOF II, and Atlas Venture Associates Opportunity II, LLC is the general partner of Atlas Venture Associates Opportunity II, L.P. The members of Atlas Venture Associates Opportunity II, LLC collectively make investment decisions on behalf of Atlas Venture Associates Opportunity II, LLC. Each of AVOF II, Atlas Venture Associates Opportunity II, L.P., and Atlas Venture Associates Opportunity II, LLC may be deemed to beneficially own the shares held by AVOF II. Dr. Booth is a member of each of Atlas Venture Associates XI, LLC Atlas Venture Associates Opportunity II, LLC, and a member of our board of directors. Dr. Booth expressly disclaims beneficial ownership of the shares owned by AVF XI and AVOF II, except to the extent of his pecuniary interest therein, if any. The address for each of these entities and individuals is 300 Technology Square, 8th Floor, Cambridge, MA 02139. |

| (2) | Information herein is based solely on a Schedule 13D filed with the SEC on February 13, 2025 by OrbiMed Advisors LLC (“OrbiMed Advisors”) and OrbiMed Capital GP VIII LLC (“GP VIII”). Consists of 3,704,959 shares of common stock held by OrbiMed Private Investments VIII, L.P. (“OPI VIII”). GP VIII is the general partner of OPI VIII. OrbiMed Advisors is the managing member of GP VIII, pursuant to the terms of the limited liability company agreement of GP VIII. GP VIII and OrbiMed Advisors share the power to direct the voting and disposition of the shares held by OPI VIII and may be deemed to be the beneficial owners of the shares held by OPI VIII. OrbiMed Advisors exercises voting and investment power through a management committee comprised of Carl L. Gordon,