---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-279213"
form_type: "8-K/A"
ticker: "OABI"
cik: "0001846253"
company_name: "OmniAb, Inc."
filed_at: "2022-11-07T23:59:59+00:00"
generated_at: "2026-06-22T05:56:49.817599+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# OmniAb files 8-K/A: Auditor changed to EY, pro forma shows $390.6M assets, 114.8M shares outstanding after SPAC close

## Summary
- Dismissed Marcum as auditor, engaged EY as new independent registered public accounting firm effective Nov 1, 2022.
- Pro forma shows 114.8M shares outstanding; Legacy OmniAb stockholders hold 85%, Sponsor 13.9%, public 1.1%.
- APAC public shareholders redeemed 21.7M shares for ~$224M ($10.32/share), leaving only 1.3M public shares.
- Adopted new certificate of incorporation, bylaws, and code of business conduct and ethics.
- OmniAb became successor issuer; OABI and OABIW now registered under Section 12(b).

## SEC filing metadata
- accession: 0001193125-22-279213
- form_type: 8-K/A
- ticker: OABI
- cik: 0001846253
- company_name: OmniAb, Inc.
- filed_at: 2022-11-07T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 4.01, 5.03, 5.05, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/d400679d8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-279213
- JSON: https://secwatch.observer/filing/0001193125-22-279213.json
- Plain text: https://secwatch.observer/filing/0001193125-22-279213.txt

## Key facts
- Auditor Changes
  OmniAb, Inc. dismissed Marcum LLP as its auditor.
  - Action: dismissal
  - Auditor: Marcum LLP
  - Successor: Ernst & Young LLP
  source text: On November 1, 2022, the Board dismissed Marcum LLP (“Marcum”), APAC’s independent registered public accounting firm prior to the Business Combination, as the Company’s independent registered public accounting firm effective immediately following the filing of the Company’s quarterly report on Form 10-Q for the quarter ended September 30, 2022
  evidence_url: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm
- Auditor Changes
  OmniAb, Inc. engaged Ernst & Young LLP as its auditor.
  - Action: engagement
  - Auditor: Ernst & Young LLP
  source text: On November 1, 2022, the Board approved the engagement of EY as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the year ending December 31, 2022
  evidence_url: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm
- Governance Changes
  OmniAb, Inc.: Adopted new Code of Business Conduct and Ethics (effective 2022-11-01).
  - Change: code of ethics
  - Effective: 2022-11-01
  source text: On November 1, 2022, the Board approved and adopted a new Code of Business Conduct and Ethics applicable to all employees, officers and directors of OmniAb.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm
- Governance Changes
  OmniAb, Inc.: Amended Certificate of Incorporation to reflect changes from business combination (effective 2022-10-31).
  - Change: charter amendment
  - Effective: 2022-10-31
  source text: The Certificate of Incorporation of the Company (the “Certificate of Incorporation”), which became effective upon filing with the Secretary of State of the State of Delaware on October 31, 2022, includes the amendments proposed by the Charter Proposals.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm
- Governance Changes
  OmniAb, Inc.: Adopted new Bylaws effective as of closing of business combination.
  - Change: bylaw amendment
  source text: Prior to the Business Combination, the Board approved and adopted the Bylaws of OmniAb (the “Bylaws”), which became effective as of the Effective Time.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1846253/000119312522279213/0001193125-22-279213-index.htm

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