Timothy A. Springer - Jun 20, 2024 Form 4 Insider Report for Tectonic Therapeutic, Inc. (TECX)

Role: Director, 10%+ Owner
Signature: /s/ Daniel Lochner, Attorney-in-Fact
Stock symbol: TECX
Transactions as of: Jun 20, 2024
Transactions value $: $0
Form type: 4
Date filed: 6/24/2024, 04:30 PM
Previous filing: Jun 5, 2024
Next filing: Jul 5, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TECX	Common Stock	Award		+2.69M			2.69M	Jun 20, 2024	Direct	F1
transaction	TECX	Common Stock	Award		+1.55M			1.55M	Jun 20, 2024	By LLC	F2, F3

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
transaction	TECX	Stock Option (Right to Buy)	Award	$0	+11.8K		$0.00	11.8K	Jun 20, 2024	Common Stock	11.8K	$16.80	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Received in exchange for 5,037,245 shares of common stock of Tectonic Therapeutic, Inc., a Delaware corporation ("Tectonic"), pursuant to an Agreement and Plan of Merger dated as of January 30, 2024 (the "Merger Agreement") by and among AVROBIO, Inc., a Delaware corporation ("AVROBIO"), Tectonic and Alpine Merger Subsidiary, Inc., a direct, wholly owned subsidiary of AVROBIO (the "Merger Sub"). Under the terms of the Merger Agreement, on June 20, 2024, Merger Sub merged with and into Tectonic (the "Merger"), with Tectonic surviving the Merger as a wholly owned subsidiary of AVROBIO. Upon the closing of the Merger, each share of Tectonic common stock was converted into the right to receive 0.534419990 shares of the Issuer's common stock, after giving effect to a reverse stock split of the Issuer's common stock of 1-for-12. Subsequent to the Merger, the name of the Issuer was changed from AVROBIO, Inc. to Tectonic Therapeutic, Inc.
F2	Received in exchange for 2,902,429 shares of common stock of Tectonic on the same terms and conditions as set forth in footnote (1) herein.
F3	These shares are held by TAS Partners, LLC ("TAS"). The Reporting Person is the sole managing member of TAS and, as such, has sole voting and dispositive power over the shares held by TAS. The Reporting Person disclaims beneficial ownership of the shares held by TAS except to the extent of his pecuniary interest therein and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
F4	1/3rd of the shares subject to the option will vest on June 20, 2025, and the balance will vest in equal monthly installments thereafter over the next 24 months, subject in each case to the continuous service of the Reporting Person to the Issuer through the applicable vesting date.