Cheil Worldwide

South Korea's largest advertising and marketing agency, founded January 17, 1973 as the in-house agency for Samsung Group. Listed on the Korea Exchange (KRX: 030000); Samsung Electronics holds ~28.4% as the largest shareholder, with National Pension Service at ~12%. World's 10th-largest agency network with FY2024 revenue of ₩4.34T (~$3.1B; +4.98% YoY) and 53 offices across 44 countries staffed by ~7,000 employees. Headquartered in Seoul. CEO Kim Jong-hyun (since December 2022). Samsung remains the anchor client; over-reliance on Samsung is documented as a qualitative strategic concern but no specific revenue-share percentage is publicly disclosed. Sources: Wikipedia + MarketScreener + Nasdaq.