"Growth is on the agenda for the market today, and their prospects are all overseas as well, so it doesn't matter too much what happens with domestic politics," he said.
Z Energy was the worst performer, dropping 1.7 per cent to $7.02. In July, a government-commissioned report into fuel prices found areas of concern in petrol pricing, with margins having risen sharply since 2011 and no justification for regional pricing differences.
"It held up briefly after the announcement of the investigation into its margins, but it does look like investors are voting with their feet at the moment," Smalley said. "Maybe they're concerned about a more regulatory-minded environment from a change of government, it certainly seems to be affecting them at the moment."
Vector fell 1.2 per cent to $3.31.
Outside the benchmark index, Serko rose 9.2 per cent to 72 cents after the online travel booking software firm said it expects first-half trading revenue to be at the top end of previous guidance, and reiterated it is expecting to post a maiden annual profit.
Serko said trading revenue was about $9.1m in the six months to September 30, up 30 per cent on the previous first half and at the top end of the 25 per cent to 30 per cent guidance it previously gave. Total income, which includes grants, is expected to be $9.6m.
The company is forecasting first-half earnings before interest, tax, depreciation and amortisation (ebitda) of $1.3m, versus a loss of $1.8m in the prior year, and expects a before-tax profit of $1m in the first half compared to the previous first half's $2m loss.