Wall Street moved modestly higher by midday Friday, yet major indexes remain on pace to break a three-week winning streak. At midday, the S&P 500 was up 0.4% to 6,630, while the Nasdaq 100 gained 0.2% to 24,440. The Russell 2000, the benchmark small-cap index, rebounded 0.5%. Blue-chip stocks led broader gains, with the Dow Jones Industrial Average advancing 0.7%.