SEC Form 4 · accession 0001209191-18-062517

Synthorx, Inc. · THOR

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Director · 10% Owner

Period of report

Dec 11, 2018

Accepted (ET)

Dec 13, 2018 · 6:35 pm EST

Rule 10b5-1 plan

unknown — predates the checkbox

Issuer CIK

0001609727

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2	Dec 11, 2018	C	1,281,664	—	A	1,468,901	I	By Avalon Ventures X, L.P.
Common Stock^F1,F2	Dec 11, 2018	C	762,617	—	A	2,231,518	I	By Avalon Ventures X, L.P.
Common Stock^F1,F2	Dec 11, 2018	C	2,517,278	—	A	4,748,796	I	By Avalon Ventures X, L.P.
Common Stock^F1,F2	Dec 11, 2018	C	1,136,631	—	A	1,136,631	I	By Avalon X SPV I, L.P.
Common Stock^F2	Dec 11, 2018	P	545,455	$11.00	A	1,682,086	I	By Avalon X SPV I, L.P.

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
Series A Preferred Stock^F2,F1	—	Dec 11, 2018	C	2,053,534	D	—	—	Common Stock	1,281,664	I
Series B Preferred Stock^F2,F1	—	Dec 11, 2018	C	1,221,896	D	—	—	Common Stock	762,617	I
Series C Preferred Stock^F2,F1	—	Dec 11, 2018	C	4,033,283	D	—	—	Common Stock	2,517,278	I
Series C Preferred Stock^F2,F1	—	Dec 11, 2018	C	1,821,156	D	—	—	Common Stock	1,136,631	I

F1Automatic conversion, in connection with the Issuer's initial public offering, of preferred stock into shares of common stock on a 1.60224-to-1 basis. The shares have no expiration date.
F2The Reporting Person is a managing member of Avalon Ventures X GP LLC and Avalon Ventures X SPV GP LLC, the general partners of Avalon Ventures X, L.P. and Avalon X SPV I, L.P., and shares voting and investment power with respect to the shares held by Avalon Ventures X, L.P. and Avalon X SPV I, L.P. The Reporting Person disclaims beneficial ownership of the shares held by Avalon Ventures X, L.P. and Avalon X SPV I, L.P., except to the extent of his actual pecuniary interest therein if any.
F3The shares were purchased at the Issuer's initial public offering.