---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-018812"
form_type: "8-K"
ticker: "TECX"
cik: "0001681087"
company_name: "Tectonic Therapeutic, Inc."
filed_at: "2024-01-30T23:59:59+00:00"
generated_at: "2026-06-06T15:04:47.729233+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# AVROBIO to merge with Tectonic in all-stock deal; $130.7M private financing; combined company targets GPCRs

## Summary
- Pre-merger AVRO holders expected to own ~22.3%; Tectonic holders ~40.2%; financing investors ~37.5% of combined firm.
- Concurrent $130.7M private placement from new and existing life sciences investors; combined cash ~$165M at close, runway into mid-2027.
- Combined company to advance Tectonic's lead asset TX45 (Fc-relaxin fusion protein) through clinical catalysts.
- AVRO stockholders to receive CVRs for contingent payments from future monetization of AVRO's legacy gene therapy assets.
- Support agreements from ~88% of Tectonic voting power and ~10.8% of AVRO shares; 180-day lock-up for insiders.

## SEC filing metadata
- accession: 0001193125-24-018812
- form_type: 8-K
- ticker: TECX
- cik: 0001681087
- company_name: Tectonic Therapeutic, Inc.
- filed_at: 2024-01-30T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 5.01, 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1681087/000119312524018812/0001193125-24-018812-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1681087/000119312524018812/d221662d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-018812
- JSON: https://secwatch.observer/filing/0001193125-24-018812.json
- Plain text: https://secwatch.observer/filing/0001193125-24-018812.txt

## Key facts
- Material Agreements
  Tectonic Therapeutic, Inc. entered into Agreement and Plan of Merger and Reorganization with AVROBIO, Inc. and Alpine Merger Subsidiary, Inc. (effective 2024-01-30).
  - Action: entry
  - Agreement: merger
  - Counterparty: AVROBIO, Inc. and Alpine Merger Subsidiary, Inc.
  - Effective: 2024-01-30
  source text: On January 30, 2024, AVROBIO, Inc., a Delaware corporation (“AVRO”), Alpine Merger Subsidiary, Inc., a Delaware corporation and a wholly owned subsidiary of AVRO (“Merger Sub”), and Tectonic Therapeutic, Inc., a Delaware corporation (“Tectonic”), entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1681087/000119312524018812/0001193125-24-018812-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.