Sovereign chief executive Nick Stanhope said it had briefed its teams on the CBA announcement this morning.
"We have also shared with them that CBA has reaffirmed that the provision of insurance products to its customers remains core to its vision."
Stanhope said it would remain "business as usual" for its staff, advisers and customers while the discussions took place.
CBA would keep the market informed of material developments.
Sovereign made a cash net profit of $102 million in the year to June 30 - down from $105m in the prior year.
Its insurance income rose from $230m to $252m and its operating expenses fell.
But the company was hit by a higher tax bill and a lower investment experience.