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On the Australian ASX price increments that a stock can move by is determined by the current value of the stock as shown below:

Stock Price Increment

Why is it then that sometimes a stock that is currently priced well above $2.00 (in some cases $30 to $40) moves up or down by an increment of only $0.005?

2

Ticks below the minimum

Like in the US, more flexibility is extended to hidden orders.

Australia has taken an aggressive approach to hidden orders in the direction of lower ticks.

History

Aussies have a rich financial that evolved differently than the Dutch custom more familiarly known in the UK and US.

They, like Chicago evolved out of commodities trade rather than trade. When commodities are worth nearly nothing per unit, larger precision comes naturally.

For the Dutch, it was the opposite. A single ship would trade in 1/64 share or for the largest vessels, 1/128 share. Here, there's no point to high precision. New York, founded by the Dutch specialized in logistics just the same.

To a man with a hammer, everything looks like a nail, so both Chicago, Australia, and other financial systems built by commodities rather than trade have extended the higher precision logic to everything else, and pricing is fantastic.

It should not be a surprise why Australia has taken a lead in pushing infinite precision.

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