After four days of cyber-attacks and trading halts on the NZX, KiwiSaver fund managers say they are frustrated, embarrassed and nervous.
Last week the stock exchange was hit by a series of sophisticated denial-of-service style attacks from overseas, sparking an investigation by the Government's GCSB communications security bureau.
The attacks meant fund managers could not buy and sell shares on the open market, and hampered their ability to calculate savers' balances.
Sam Stubbs is the chief executive of Simplicity.