---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-23-096515"
form_type: "8-K"
ticker: "OMC"
cik: "0000029989"
company_name: "OMNICOM GROUP INC."
filed_at: "2023-12-18T23:59:59+00:00"
generated_at: "2026-06-07T11:30:15.089028+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Omnicom appoints Casey Santos as independent director, effective Jan 1, 2024

## Summary
- Board size increased from 10 to 11; Santos to serve on Finance Committee.
- Santos is CIO of Asurion, with prior roles at Alliance Bernstein, General Atlantic, and McKinsey.
- She began her career as a NASA Flight Controller supporting over 20 space shuttle missions.
- Board now includes 10 independent directors, 7 women, and 6 ethnically diverse members.

## SEC filing metadata
- accession: 0001213900-23-096515
- form_type: 8-K
- ticker: OMC
- cik: 0000029989
- company_name: OMNICOM GROUP INC.
- filed_at: 2023-12-18T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/29989/000121390023096515/0001213900-23-096515-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/29989/000121390023096515/ea190219-8k_omnicom.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-23-096515
- JSON: https://secwatch.observer/filing/0001213900-23-096515.json
- Plain text: https://secwatch.observer/filing/0001213900-23-096515.txt

## Key facts
- Executive change
  Cassandra Santos was elected as Director at OMNICOM GROUP INC..
  - Action: elected
  - Role: Director
  source text: the Board of Directors (the “Board”) of Omnicom Group Inc. (the “Company”) increased the size of the Board from ten persons to eleven persons and elected Cassandra Santos as a director to fill the vacancy created by such increase, effective January 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/29989/000121390023096515/0001213900-23-096515-index.htm

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