Stockbroker Tricom Equities has received fines from the Australian Securities Exchange (ASX) amounting to $1.35 million plus GST for a series of contraventions, including market manipulation.
The fine is the highest amount ever handed out by the stock market operator.
"The tribunal found that some of the contraventions were so significant and serious that they deserve the imposition of the highest financial penalty available at the time the contraventions occurred," the ASX said.
"The breaches ranged from Tricom's inability to meet its payment obligations within the time required through to blatant and unmistakable market manipulation."
The tribunal has found Tricom guilty of committing 10 contraventions of ASX operating rules, including settlement and capital liquidity failures.
"The events have potentially corroded market confidence and require the imposition of the maximum financial penalty," the ASX said.
Tricom did not contest the contraventions.
