---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-163207"
form_type: "8-K/A"
ticker: "TECX"
cik: "0001681087"
company_name: "Tectonic Therapeutic, Inc."
filed_at: "2024-06-18T23:59:59+00:00"
generated_at: "2026-06-01T03:55:24.468691+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# AVROBIO merger with Tectonic delayed to June 20; 1-for-12 reverse split effective June 20; new ticker TECX

## Summary
- Merger closing postponed from June 18 to around June 20, 2024.
- Stockholders approved reverse split ratio of 1-for-12; effective June 20 at 4:00 p.m. ET.
- No fractional shares; cash payment based on closing price prior to effective time.
- Common stock to trade on split-adjusted basis under ticker TECX starting June 21, 2024.

## SEC filing metadata
- accession: 0001193125-24-163207
- form_type: 8-K/A
- ticker: TECX
- cik: 0001681087
- company_name: Tectonic Therapeutic, Inc.
- filed_at: 2024-06-18T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1681087/000119312524163207/0001193125-24-163207-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1681087/000119312524163207/d834577d8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-163207
- JSON: https://secwatch.observer/filing/0001193125-24-163207.json
- Plain text: https://secwatch.observer/filing/0001193125-24-163207.txt

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