In the stock market, there are those who gained 168 percent and those who lost 61 percent.

Tekfen Holding has led Borsa İstanbul's BIST 100 with a 168.47% gain since the start of the year, while Europen Endüstri posted the index's steepest decline at 61.67%, highlighting a sharply divergent performance among Turkish equities. The spread underscores how stock-specific risk has outweighed any uniform index trend, with some investors more than doubling their money while others lost over 60% of value. The article profiles the index's biggest winners and losers over the period. Investors will watch whether Tekfen can hold its lead and whether Europen stabilizes or extends its losses in the next reporting cycle.