FORM ▼ -1.2% - FormFactor, Inc. $FORM PSKY QRVO SWKS WBD CTVA OLN SPGI TWLO VYLR WK - Vylor Added to the S&P 500; Twilio Set to Join S&P 500; Others to Join S&P MidCap 400 and S&P SmallCap 600 01-OCT-2026 06:01 PM ET