Russia has made one of the most extreme responses to Fonterra's contamination scare so far, banning all goods made by the NZ dairy giant, according to media reports.

Xero, which held its annual meeting at Te Papa on Thursday, is head and shoulders above most New Zealand companies for meeting organisation and clarity of message.

There has been much excitement about healthcare company Ebos since its spectacular $1.1 billion purchase of Australia's Symbion and its successful capital raising.

Slowing revenue growth means Xero's soaring share price can no longer be justified, a fund manager says.

Michael Dell, the man who founded Dell Computers, has joined fellow US multi-billionaire George Soros on the Guinness Peat Group share register.

Shares in Auckland International Airport (AIA) have put on a strong burst over the past month and the market talk was that the company could be on the verge of selling its stake in North Queensland Airports.

Synlait Milk shares debuted at $2.62 and went on to trade in a $2.61 to $2.90 range before closing at $2.74.

Technology manufacturer Rakon has responded to a query from the Shareholders Association regarding an "unusual" rise in its share price in the lead-up to a major announcement last week.

Xero, the Kiwi accounting software provider that's yet to turn a profit, is now worth more than $2 billion.

Infant formula is clearly where the action is on the international dairy markets.

It's been a roller coaster week for the New Zealand share market. The NZX 50 fell more than 1 per cent on Tuesday as the Chinese stockmarket fell to its lowest level in four years amid fears of a credit squeeze slowing its economy.

China's Bright Dairy will retain four seats on the eight-member Synlait Milk board, despite the likelihood it will lose its majority ownership status.

Sky TV has taken a big hit over the news of losing the rights to show English Premier League football to TVNZ and Coliseum EPL Management, but there appears to be division over the longer-term impact.

Europe's main stock markets rode out a rollercoaster session after heavy losses in Tokyo on investor fears of central banks pulling the plug on their extraordinary stimulus measures.

Shares in cloud-computing software company Xero hit a new high yesterday despite the NZX 50 index having another day in the red.