Concern over ethical investment practices - including revelations scheme providers were potentially legally opposed by investing in banned weapon-makers - saw KiwiSaver churn numbers spike over the past two months.
According to the latest monthly data on the scheme provided by Inland Revenue, 13,250 people changed schemes in August and 15,064 in September.
This compares with an average monthly churn of 11,489 in the ten months preceding, meaning the recent surge amounted to a 23 per cent increase - or 5,317 more people - changing schemes.
Assuming those switching scheme had the average account balance of $11,500 for all contributors, this represents a movement of funds worth $61.1m.
The Herald and RNZ revealed in August that KiwiSaver fund managers had invested $153m of client funds in stocks blacklisted by the government-run New Zealand Superannuation Fund. These investments included $43.4m of potentially illegal investments in companies making weapons banned by New Zealand legislation.