Final answer:
The Omnicom Group includes companies such as BBDO Worldwide, DDB Worldwide, TBWA Worldwide, OMD Worldwide, and PHD Worldwide.
Step-by-step explanation:
The Omnicom Group is a multinational advertising and public relations company that operates through a family tree of subsidiary companies. Some well-known companies within the Omnicom Group family tree include:
- BBDO Worldwide
- DDB Worldwide
- TBWA Worldwide
- OMD Worldwide
- PHD Worldwide
These companies are among the largest advertising and marketing agencies in the world, providing services to various clients across different industries.