大豐電 (6184.TW) 2025Q4 financial report shows that the Return on Sales (ROS) of 27.75%, has decreased slightly from last year. This shows the company’s operational efficiency has recently worsened, possibly due to higher costs, more intense competition, or product mix changes. A fast drop in ROS usually means the company is under pressure in core profitability or expense control—keep an eye on whether they can adjust their strategy and optimize costs effectively.