Tectonic Therapeutic, Inc. — Director's Dealing 2023

Jan 26, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AVROBIO, Inc. (AVRO)
CIK: 0001681087
Period of Report: 2022-12-28

Reporting Person: MACKAY GEOFFREY (Director, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2022-12-28	Common Stock	G	245123	—	Disposed	142013	Direct
2022-12-28	Common Stock	G	245123	—	Acquired	445123	Indirect
2023-01-24	Common Stock	M	45999	$.91	Acquired	188012	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-01-24	Stock Option (Right to Buy)	$.91	M	45999	Disposed	2027-06-12	Common Stock (45999)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	72604	Indirect
Common Stock	72604	Indirect

Footnotes

F1: This transaction was a bona fide gift of common stock to The Geoff R. MacKay Irrevocable Trust. The reporting person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

F2: The shares were previously held in a custodial account for the Reporting Person's son, established pursuant to the Uniform Transfers to Minors Act ("UTMA"), for which the Reporting Person served as custodian. The shares have since been distributed to the Reporting Person's son, as required by the terms of the account upon the son attaining the age of 21. 54,453 shares were subsequently transferred to the Mac C. MacKay Irrevocable Trust on December 30, 2022.

F3: 25% of the shares vested on June 13, 2018, and the remaining 75% vested in equal monthly installments thereafter over a three-year period.