Australia-based investment company Mirrabooka has posted a 31 per cent increase in full-year net profit, and announced a share purchase plan saying equity valuations had gone back to attractive buying levels.

The firm declared a net profit of $9.9 million for the year to June 30 compared with $7.6 million in the previous corresponding period, due to revisions in the accounting standard that saw realised gains up to December 7 counted in net profit.

Net operating profit for the year fell to $6.56 million, down 22 per cent on the previous corresponding period, as a general slump in dividends impacted Mirrabooka's dividend and distribution income.

Interest income also declined as Mirrabooka invested cash into the share market.

A final, fully franked dividend of 6.5 cents was reported, the same value as last year.

"Mirrabooka believes the recent fall in the market has driven valuations back towards more attractive buying levels," the company said in a statement.

With it being close to being fully invested, Mirrabooka is set to conduct a share purchase plan.

Shareholders can invest up to $15,000 in new shares, with the price to be a 2.5 per cent discount to the average price of its shares in the five days leading up to the close of the plan. Details of the plan are said to be released to shareholders on July 20.

Shares the small-cap investment firm last traded at $1.75.