Why Austal, Boral, Spark NZ, & Splitit are tumbling lower

The S&P/ASX 200 Index (ASX: XJO) is on course to record another disappointing decline on Thursday. In afternoon trade, the benchmark index is down 0.6% to 6,753.8 points.

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

The Austal share price has fallen 3.5% to $2.32. This is despite the shipbuilder announcing the delivery of a new vessel after the market close on Wednesday. Austal delivered its ninth guardian-class patrol boat to the Australian Department of Defence. The vessel, named ‘HMPNGS Rochus Lokinap’, was gifted to the Papua New Guinea Defence Force under the Pacific Patrol Boat Replacement project.

The Boral share price is down 2% to $5.51. This decline…