Bruce Booth - 06 Feb 2025 Form 3 Insider Report for Sionna Therapeutics, Inc. (SION)

Role
Director
Signature
/s/ Ommer Chohan, Attorney-in-Fact
Issuer symbol
SION
Transactions as of
06 Feb 2025
Net transactions value
$0
Form type
3
Filing time
06 Feb 2025, 20:58:09 UTC
Previous filing
09 Jul 2024
Next filing
10 Feb 2025
SEC
View on sec.gov

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding SION Series Seed convertible preferred stock 06 Feb 2025 Common Stock 719,355 By Atlas Venture Fund XI, L.P. F1, F2
holding SION Series A convertible preferred stock 06 Feb 2025 Common Stock 1,236,271 By Atlas Venture Fund XI, L.P. F1, F2
holding SION Series B convertible preferred stock 06 Feb 2025 Common Stock 888,599 By Atlas Venture Fund XI, L.P. F1, F2
holding SION Series C convertible preferred stock 06 Feb 2025 Common Stock 42,068 By Atlas Venture Fund XI, L.P. F1, F2
holding SION Series C convertible preferred stock 06 Feb 2025 Common Stock 747,727 By Atlas Venture Opportunity Fund II, L.P. F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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") is convertible into Common Stock on a one-for-1.4611 basis at the option of the holder, and will convert automatically upon the closing of the Issuer's initial public offering into the number of shares shown in column 3 without payment of consideration. The Preferred Stock has no expiration date.
F2 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. The Reporting Person is a member of AVA XI LLC and disclaims beneficial ownership of such securities held by AVF XI, except to the extent of his pecuniary interest therein, if any.
F3 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. The Reporting Person is a member of AVAO II LLC and disclaims beneficial ownership of such securities held by AVOF II, except to the extent of his pecuniary interest therein, if any.

Remarks:

Exhibit 24 - Power of Attorney