View full KiwiSaver table here

According to the figures, as at March 31 the Commonwealth Bank-owned ASB once more topped the list as the single largest KiwiSaver scheme with almost $450 million in funds under management and over 170,000 members compared to $101 million under management and 72,305 members at the same time last year. The ASB-owned FirstChoice scheme also totallled 11,213 members and $37.3 million as at the end of March this year.

However, ING was the most successful overall provider with a total 212,732 members and $523 million across the four schemes it manages - the ING default scheme, ANZ, National Bank and SIL.

The survey, which represents about $2.6 billion in funds under management and almost 980,000 KiwiSaver members, showed the average member balance as at March 31 this year was approximately $2,650 with a wide range across the providers. The Huljich KiwiSaver scheme recorded the lowest average member balance of $670 while the tiny $1.55 million Brook Asset Management scheme scored the highest average with over $7,045 per member.

Among the larger providers, ING's SIL scheme reported the highest average member balance of $3,463 with its sister bank products managed by ANZ and the National Bank recording the lowest averages of $1,745 and $1,724 respectively.

While the default providers and other major institutions carved out the lion's share of the KiwiSaver market several mid-tier players were also snapping at their heels, most notably the Gareth Morgan scheme which reported $142.2 million in funds under management as at March 31 this year. Fisher Funds ($53.56 million), Fidelity Life ($37.3 million) and Medical Assurance ($35.6 million) have also accumulated respectable funds under management.

During the year two smaller providers the Australian-backed Eosaver scheme and the union-controlled IRIS scheme shut down after failing to meet growth expectations. The 3,254 Eosaver members, who had collectively accumulated almost $6 million at its close, were given three months to select a new provider before being allocated to a default scheme. Meanwhile, IRIS negotiated a deal with the Gareth Morgan scheme to transfer members. It is understood about 80% of the 1,076 IRIS KiwiSaver members opted for the Gareth Morgan scheme.

See the full report on who is winning the battle for KiwiSavers here