The New Zealand share market's benchmark top 50 index jumped 84 points (1.6 percent), to a record 5233 points on Wednesday.
One of the big risers of the day was Xero, after it announced it had formed a partnership in the United States with the world's biggest tax services provider, H&R Block.
A portfolio manager at Milford Asset Management, Mark Warminger, said it was a very important move for Xero, as H&R block had 11,000 offices worldwide.
And H&R Block was strong on tax accountancy - a sector which was particularly suited to online services in America.
"This is a gamechanger for them in the US," Mr Warminger said.
Xero shares jumped as much as 11.7 percent on the news, but then eased back.
The stock closed up 5.5 percent, a lift of $1.66 to $31.65
Shares in OceanaGold closed up 29 cents, or 11 percent, to $2.93 on the news that it made a record profit of nearly $59 million in the three months to March.
And Diligent shares also rose 23 cents, or 5 percent, to $4.54 after it announced its chief financial officer, Carl Blandino, is stepping down now that the company has finally lodged its annual report for calendar 2013.
The New Zealand dollar is stronger against the currencies of all the country's major trading partners.
The senior client advisor at Bancorp Treasury Services, Peter Cavanaugh, says at least part of the reason for the currency's strength remains New Zealand's high interest rates attracting foreign investors.
At the end of the local business day, the kiwi was trading at 85.63 US cents, 92.2 Australian cents, 50.87 British pence, 0.6199 euro, 87.67 yen and 5.36 renminbi.
