---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-217333"
form_type: "8-K"
ticker: "IONS"
cik: "0000874015"
company_name: "IONIS PHARMACEUTICALS INC"
filed_at: "2024-09-12T23:59:59+00:00"
generated_at: "2026-05-31T05:22:18.778248+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Ionis raises ~$500M in public offering of 11.5M shares at $43.50/share

## Summary
- Sold 11.5M shares of common stock at $43.50 per share; gross proceeds ~$500.3M.
- Underwriters have 30-day option to purchase up to an additional 1.725M shares.
- Offering closed September 11, 2024; lead underwriters Morgan Stanley and Goldman Sachs.
- Proceeds not specified; offering conducted under existing shelf registration.

## SEC filing metadata
- accession: 0001193125-24-217333
- form_type: 8-K
- ticker: IONS
- cik: 0000874015
- company_name: IONIS PHARMACEUTICALS INC
- filed_at: 2024-09-12T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/874015/000119312524217333/0001193125-24-217333-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/874015/000119312524217333/d865048d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-217333
- JSON: https://secwatch.observer/filing/0001193125-24-217333.json
- Plain text: https://secwatch.observer/filing/0001193125-24-217333.txt

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