The New Zealand Superannuation Fund is worth close to $22 billion after its investments returned 17.58 per cent in the year to February 28.
The fund, which was set up in 2003 to help pay for the costs of the baby boomer retirement bubble, was up 1.31 per cent last month despite having no new financial contributions from the Government in the last three years.
The fund now has an average yearly return of 8.41 per cent per annum since its was launched in September 2003 and has added $5 billion above what it would have got if the money had been invested at the Treasury Bill rate.
Of the $22 billion 24 per cent is invested in New Zealand with North America (36 per cent) and Europe (19 per cent) also big focuses for the fund.
Fletcher Building, the country's largest listed company is also the largest listed New Zealand stock held by the fund followed by Telecom and Auckland Airport.