---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-062137"
form_type: "8-K"
ticker: "ABOS"
cik: "0001576885"
company_name: "Acumen Pharmaceuticals, Inc."
filed_at: "2026-09-16T13:26:38+00:00"
generated_at: "2026-09-16T13:28:16.302284+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "low"
source: SEC EDGAR
---

# Acumen hosts Sept 16 Investor Day; no substantive data in 8-K exhibit

## Summary
- Investor Day held Sept 16, 2026 beginning 10:00 a.m. ET; live webcast hosted by Acumen Pharmaceuticals.
- Slide deck posted on IR website after event; Exhibit 99.1 contains title slide only — no results or guidance.
- No financial, clinical, or guidance figures disclosed anywhere in this filing; presentation content not included.
- Signed by CFO/Chief Business Officer Matthew Zuga; common stock listed on Nasdaq under ABOS.

## SEC filing metadata
- accession: 0001628280-26-062137
- form_type: 8-K
- ticker: ABOS
- cik: 0001576885
- company_name: Acumen Pharmaceuticals, Inc.
- filed_at: 2026-09-16T13:26:38+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: low
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1576885/000162828026062137/0001628280-26-062137-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1576885/000162828026062137/abos-20260916.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-062137
- JSON: https://secwatch.observer/filing/0001628280-26-062137.json
- Plain text: https://secwatch.observer/filing/0001628280-26-062137.txt

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