At the time, then-chief executive Dave Taylor said the company was working with the commission to reach an appropriate resolution and "the expected costs of this prosecution have been accrued, as have any expected proceeds under the group's insurance policies", without explicitly stating it had entered a guilty plea.
Taylor stepped down a month later, ending eight years in charge.
Steel & Tube representatives were not available for comment and the company has not made a statement to the stock exchange, which requires issuers to make public material information in a timely manner to keep market participants informed.
The company's shares closed down 0.5 per cent at $1.99, the first time the stock has closed below $2 since July last year.
The Commerce Commission said two other firms facing prosecution — Timber King and NZ Steel Distributor — also pleaded guilty and will be sentenced on December 8 in the Auckland District Court. "Charges against another company have been filed. We cannot provide further information as the case has not had a first call in court yet and the company could still apply for name suppression," the spokeswoman said.
"The commission expects to lay charges against one further company."
