---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-227267"
form_type: "8-K"
ticker: null
cik: "0001708493"
company_name: "Harpoon Therapeutics, Inc."
filed_at: "2023-09-01T23:59:59+00:00"
generated_at: "2026-06-11T00:36:14.178917+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Harpoon Therapeutics to effect 1-for-10 reverse stock split to regain Nasdaq compliance

## Summary
- Reverse stock split ratio 1-for-10, effective at 5:00 p.m. ET on September 1, 2023.
- Outstanding shares reduced from ~40.3 million to ~4.0 million shares.
- Common stock will trade on Nasdaq on a split-adjusted basis from September 5, 2023, under ticker HARP.
- No fractional shares issued; stockholders will receive cash for fractional interests.
- CUSIP changed to 41358P205; par value remains $0.0001 per share.

## SEC filing metadata
- accession: 0001193125-23-227267
- form_type: 8-K
- cik: 0001708493
- company_name: Harpoon Therapeutics, Inc.
- filed_at: 2023-09-01T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1708493/000119312523227267/0001193125-23-227267-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1708493/000119312523227267/d544436d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-227267
- JSON: https://secwatch.observer/filing/0001193125-23-227267.json
- Plain text: https://secwatch.observer/filing/0001193125-23-227267.txt

## Key facts
- Governance Changes
  Harpoon Therapeutics, Inc.: Filing of Certificate of Amendment to effect a 1-for-10 reverse stock split of common stock, approved by stockholders and the Board, to regain Nasdaq compliance (effective 2023-09-01).
  - Change: charter amendment
  - Effective: 2023-09-01
  source text: On September 1, 2023, the Company filed with the Secretary of State of the State of Delaware a Certificate of Amendment to its amended and restated certificate of incorporation (the “ Charter Amendment ”) to effect the Reverse Stock Split.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1708493/000119312523227267/0001193125-23-227267-index.htm

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