RA CAPITAL MANAGEMENT, L.P.

Holdings History for Sionna Therapeutics, Inc. - Common Stock, $0.001 par value per share (SION)

Symbol: SION on Nasdaq
Investment type: Equity / Common Stock, $0.001 par value per share
Latest Disclosed Shares Owned: 10,071,712 shares
Security Ownership %: 23%

Shares, Excluding Options vs Price

Value, Excluding Options

RA Capital Management, L.P. ownership in Sionna Therapeutics, Inc. Common Stock, $0.001 par value per share (SION)

07 Nov 2025 - RA Capital Management, L.P. has filed an SCHEDULE 13D/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 10,071,712 shares of Sionna Therapeutics, Inc. Common Stock, $0.001 par value per share (SION). This represents 23% ownership of the company. In their previous filing dated 18 Feb 2025, RA CAPITAL MANAGEMENT, L.P. had reported owning 10,445,322 shares, indicating a decrease of +3.6%. .

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
RA Capital Management, L.P.	23%	-4.6%	$296,218,114	10,071,712	-373,610	-3.6%	$29.41	13D/A	05 Nov 2025	07 Nov 2025, 16:59
RA Capital Management, L.P.	24%		$125,761,677	10,445,322			$12.04	13D	10 Feb 2025	18 Feb 2025, 16:25

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	4.2%	-0.23%	$407,493,551	9,905,045	-540,277	-5.2%	$41.14	Q4 2025
30 Sep 2025	3.8%	0%	$307,196,920	10,445,322	0		$29.41	Q3 2025
30 Jun 2025	3.1%	0%	$181,226,337	10,445,322	0		$17.35	Q2 2025
31 Mar 2025	1.8%	+1.8%	$109,258,068	10,445,322	+10,445,322	NEW	$10.46	Q1 2025

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.