Global Family Day 2025 highlights the immense wealth of prominent families, with the Koch family topping the list with an estimated $150.5 billion. Their fortune stems from Koch Industries, a diverse conglomerate. The Mars family follows closely with an estimated $143.4 billion, derived from Mars, Inc., a major privately held food and pet care company known for popular confectionery brands. Both families maintain a high degree of privacy regarding their vast business empires.