---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-23-022159"
form_type: "8-K"
ticker: null
cik: "0001614067"
company_name: "Aridis Pharmaceuticals, Inc."
filed_at: "2023-06-23T23:59:59+00:00"
generated_at: "2026-06-13T18:06:24.453996+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Aridis Pharmaceuticals appoints Grassi & Co. as new auditor after Baker Tilly resignation

## Summary
- Baker Tilly resigned as independent auditor effective after filing Q1 2023 10-Q.
- Grassi & Co. appointed as new independent registered public accounting firm effective June 16, 2023.
- Audit Committee approved the appointment; no prior consultations with Grassi on accounting matters.
- No disagreements or reportable events occurred with former auditor during 2022 or Q1 2023.

## SEC filing metadata
- accession: 0001493152-23-022159
- form_type: 8-K
- cik: 0001614067
- company_name: Aridis Pharmaceuticals, Inc.
- filed_at: 2023-06-23T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 4.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1614067/000149315223022159/0001493152-23-022159-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1614067/000149315223022159/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-23-022159
- JSON: https://secwatch.observer/filing/0001493152-23-022159.json
- Plain text: https://secwatch.observer/filing/0001493152-23-022159.txt

## Key facts
- Auditor Changes
  Aridis Pharmaceuticals, Inc. engaged Grassi & Co. CPAs, P.C. as its auditor.
  - Action: engagement
  - Auditor: Grassi & Co. CPAs, P.C.
  source text: the Company appointed Grassi & Co. CPAs, P.C. (" Grassi ") as the Company's new independent registered public accounting firm effective as of June 16, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1614067/000149315223022159/0001493152-23-022159-index.htm

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