Why Afterpay, Chorus, NAB, & Omni Bridgeway shares are dropping

It has been a volatile start to the week for the S&P/ASX 200 Index (ASX: XJO). In afternoon trade, the benchmark index has given back its earlier gains and is down 0.1% to 7,398.7 points.

Four ASX shares that are falling more than most today are listed…