#CIEN

• Best stock of the week: Fair Isaac (FICO) +15.52%, plus the biggest losers (October 16, 2026)

  The S&P 500 slipped 1.95% this week, with the Nasdaq down 4.48% and the Russell 2000 off 3.05%, while the Dow edged up 0.67%. Energy and defense names led weekly gains, while…