Why Humm, Premier Investments, Western Areas, & Zip shares are sinking

The S&P/ASX 200 Index (ASX: XJO) is having a day to forget. In afternoon trade, the benchmark index is down 1.3% to 7,247.2 points.

Four ASX shares that are falling more than most today are listed below. Here’s why they are sinking:

The Humm share…