Herfindahl-Hirschman Index or HHI is an index that measures the concentration of market players in any industry. With the high competition and number of market players, it tends to reach 0; while in the case of hegemonization it approaches its highest 10,000. The industries with HHI above 2000 are considered highly concentrated. The author calculated the HHI in the Car Industry of Pakistan with data of market share from Pak Wheels and PAMA. • HHI in Car Industry in Pakistan • 1300cc above category: Toyota 4500 HHI • 1000 cc Category: Suzuki 8500 HHI • 880 cc Category: 650