4

Changes in Ownership

Sionna Therapeutics, Inc. Filed 2025-02-10 Acc 0001415889-25-003504

Director bought 1,125,000 shares at $18.00 ($20,250,000)

Director acquired 7,951,493 shares (conversion)

From the SEC's structured data for this filing

Trades in this filing

Insider	Date	Transaction	Shares	Price	Value	Owned after	D/I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion	+5,021,990			5,900,779	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion	+527,444			869,651	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion	+2,222,084			2,222,084	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion	+179,975			327,808	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Purchase	+1,022,586	$18.00	$18,406,548	6,923,365	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Purchase	+102,414	$18.00	$1,843,452	2,324,498	I
Derivatives
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series Seed Preferred Stock	−819,153			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series Seed Preferred Stock	−319,069			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series Seed Preferred Stock	−138,054			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series A Preferred Stock	−1,229,830			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series A Preferred Stock	−451,580			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series A Preferred Stock	−124,908			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series B Preferred Stock	−923,773			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series B Preferred Stock	−2,155,469			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series C Preferred Stock	−4,364,874			0	I
RA CAPITAL MANAGEMENT, L.P. Director	2025-02-10	Conversion · Series C Preferred Stock	−1,091,219			0	I
Open-market purchases · 1,125,000 sh · avg $18.00 · $20,250,000