Why Block, DroneShield, EBR Systems, and Insignia shares are racing higher

The S&P/ASX 200 Index (ASX: XJO) is having a positive start to the week. At the time of writing, the benchmark index is up 0.2% to 8,267.9 points.

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

The Block Inc…