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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
2036042	Sionna Therapeutics Inc.	SION	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1315082	Ra Capital Healthcare Fund Lp	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1346824	Ra Capital Management, L.p.	200 Berkeley Street, 18Th Floor Boston MA 02116	No	No	No	No
1384859	Peter Kolchinsky	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1619841	M. Rajeev Shah	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	Yes	No
1780117	Ra Capital Nexus Fund, L.p.	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	No	No
1883840	Ra Capital Nexus Fund Iii, L.p.	C/O Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2025-02-10	5,021,990	$0.00	5,900,779	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2025-02-10	527,444	$0.00	869,651	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2025-02-10	2,222,084	$0.00	2,222,084	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2025-02-10	179,975	$0.00	327,808	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2025-02-10	1,022,586	$18.00	6,923,365	No	4	P	Indirect	See footnotes
Common Stock	Acquisiton	2025-02-10	102,414	$18.00	2,324,498	No	4	P	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnotes
No	4	C	Indirect	See footnotes
No	4	C	Indirect	See footnotes
No	4	C	Indirect	See footnotes
No	4	P	Indirect	See footnotes
No	4	P	Indirect	See footnotes

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series Seed Preferred Stock	Disposition	2025-02-10	819,153	$0.00	560,642	$0.00
Common Stock	Series Seed Preferred Stock	Disposition	2025-02-10	319,069	$0.00	218,375	$0.00
Common Stock	Series Seed Preferred Stock	Disposition	2025-02-10	138,054	$0.00	94,486	$0.00
Common Stock	Series A Preferred Stock	Disposition	2025-02-10	1,229,830	$0.00	841,716	$0.00
Common Stock	Series A Preferred Stock	Disposition	2025-02-10	451,580	$0.00	309,069	$0.00
Common Stock	Series A Preferred Stock	Disposition	2025-02-10	124,908	$0.00	85,489	$0.00
Common Stock	Series B Preferred Stock	Disposition	2025-02-10	923,773	$0.00	632,244	$0.00
Common Stock	Series B Preferred Stock	Disposition	2025-02-10	2,155,469	$0.00	1,475,237	$0.00
Common Stock	Series C Preferred Stock	Disposition	2025-02-10	4,364,874	$0.00	2,987,388	$0.00
Common Stock	Series C Preferred Stock	Disposition	2025-02-10	1,091,219	$0.00	746,847	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

Each share of Series Seed Preferred Stock, Series A Preferred Stock, Series B Preferred Stock, and Series C Preferred Stock (collectively the "Preferred Stock") converted into shares of Common Stock of the Issuer on a one-for-1.4611 basis upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date.
Held directly by RA Capital Healthcare Fund, L.P. (the "Fund").
RA Capital Management, L.P. (the "Adviser") is the investment manager for the Fund, RA Capital Nexus Fund, L.P. (the "Nexus Fund"), RA Capital Nexus III Fund, L.P. (the "Nexus Fund III"), and a separately managed account (the "Account"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, the Fund, he Nexus Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
Held directly by the Nexus Fund.
Held directly by Nexus Fund III.
Held directly by the Account.