Wall Street’s main indexes were subdued at open on Friday, looking to clock a third straight annual gain in a year fueled by massive stimulus and a strong retail participation. The Dow Jones Industrial Average fell 12.23 points, or 0.03 percent, at the open to 36,385.85. The S&P 500 opened lower by 3.52 points, or 0.07 percent, at 4,775.21, while the Nasdaq Composite dropped 18.66 points, or 0.12 percent, to 15,722.91 at the opening bell.