New Zealand shares closed slightly changed with a positive bias on Wednesday despite the S&P 500 reaching a record close on Tuesday.

The S&P/NZX 50 Index edged up 0.1% or 11.3 points to close at 13,529.06.

On Tuesday, S&P 500 rose 0.5% to reach its highest recorded close of 6,909.79. Meanwhile, the Nasdaq Composite added 0.5% and the Dow Jones gained 0.1%.

New Zealand's Commerce Commission said it is not yet convinced that US-based Mohawk Industries' proposed takeover of Bremworth (NZE:BRW) would not lessen competition.

"On the basis of the evidence collected to date, we are currently not satisfied that the proposed acquisition will not have, or would not be likely to have, the effect of substantially lessening competition in one or more relevant markets," the regulator said in a statement.

In corporate news, NZX (NZE:NZX) named acting Chief Information Officer Daniel Juchnowicz as permanent chief information officer.

Vista Group International (ASX:VGL, NZE:VGL) received notice that UBS Group and its affiliates are no longer substantial holders of the company, effective Dec. 19.