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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
1708269	Atlas Venture Fund Xi, L.p.	300 Technology Square, 8Th Floor Cambridge MA 02139	No	No	No	No
1780067	Atlas Venture Associates Xi, Llc	300 Technology Square, 8Th Floor Cambridge MA 02139	No	No	No	No
1780068	Atlas Venture Associates Xi, L.p.	300 Technology Square, 8Th Floor Cambridge MA 02139	No	No	No	No
1885327	Atlas Venture Opportunity Fund Ii, L.p.	300 Technology Square, 8Th Floor Cambridge MA 02139	No	No	No	No
1935810	Atlas Venture Associates Opportunity Ii, Llc	300 Technology Square, 8Th Floor Cambridge MA 02139	No	No	No	No
1935814	Atlas Venture Associates Opportunity Ii, Lp	300 Technology Square, 8Th Floor Cambridge MA 02139	No	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	2,886,293	$0.00	2,886,293	No	4	C	Direct
Common Stock	Acquisiton	2025-02-10	747,727	$0.00	747,727	No	4	C	Indirect	By Atlas Venture Opportunity Fund II, L.P.
Common Stock	Acquisiton	2025-02-10	60,000	$18.00	807,727	No	4	P	Indirect	By Atlas Venture Opportunity Fund II, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	C	Indirect	By Atlas Venture Opportunity Fund II, L.P.
No	4	P	Indirect	By Atlas Venture Opportunity Fund II, L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series Seed convertible preferred stock	Disposition	2025-02-10	1,051,051	$0.00	719,355	$0.00
Common Stock	Series A convertible preferred stock	Disposition	2025-02-10	1,806,317	$0.00	1,236,271	$0.00
Common Stock	Series B convertible preferred stock	Disposition	2025-02-10	1,298,332	$0.00	888,599	$0.00
Common Stock	Series C convertible preferred stock	Disposition	2025-02-10	61,463	$0.00	42,068	$0.00
Common Stock	Series C convertible preferred stock	Disposition	2025-02-10	1,092,504	$0.00	747,727	$0.00

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

Footnotes

Each share of Series Seed convertible preferred stock, Series A convertible preferred stock, Series B convertible preferred stock and Series C convertible preferred stock (collectively, the "Preferred Stock") automatically converted into shares of the Issuer's Common Stock on a one-for-1.4611 basis upon the closing of the Issuer's initial public offering on February 10, 2025. The Preferred Stock had no expiration date.
These shares are held directly by Atlas Venture Fund XI, L.P. ("AVF XI"). The general partner of AVF XI is Atlas Venture Associates XI, L.P. ("AVA XI LP"). Atlas Venture Associates XI, LLC ("AVA XI LLC") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by AVF XI, except to the extent of its pecuniary interest therein, if any.
These shares are held directly by Atlas Venture Opportunity Fund II, L.P. ("AVOF II"). The general partner of AVOF II is Atlas Venture Associates Opportunity II, L.P. ("AVAO II LP"). Atlas Venture Associates Opportunity II, LLC ("AVAO II LLC") is the general partner of AVAO II LP. Each of AVAO II LP and AVAO II LLC disclaims Section 16 beneficial ownership of the securities held by AVOF II, except to the extent of its pecuniary interest therein, if any.