Industrial concentration in South Korea increased slightly in 2011 from a year earlier, the antitrust watchdog said Sunday, indicating that top-ranking companies have tightened their grip on the market. The industrial concentration in the mining and manufacturing areas stood at 45.2 percent in 2011, up 0.2 percentage point from a year earlier. When adjusted for market size of each industry, the figure rose 1.2 percentage points to 56.1 percent, the Fair Trade Commission (FTC) said in a report.