By Ulrike Dauer

FRANKFURT--Commerzbank AG (CBK.XE) on Tuesday said it plans to raise 2.5 billion euros ($3.25 billion) by selling new shares in a capital increase aimed at repaying German state aid and boosting the bank's equity capital.

The price, at EUR4.50 a share, marks a 55% discount to Monday's closing price of EUR9.93, higher than some analysts' expectations of a 35% discount.

The subscription period for the new shares runs from May 15 to May 28, roughly in line with the envisaged schedule announced in March. Commerzbank said 20 new shares will be offered for every 21 existing shares held. The new shares are entitled to a dividend as of January 2013, and Deutsche Bank, Citi and HSBC agreed to fully underwrite the capital increase volume.

When the bank announced the measures in March, it said it planned to take advantage of "attractive" market conditions to bolster its balance sheet and take another bold step to reduce government involvement in the bank.

The move will allow the bank to fully repay the remaining EUR1.6 billion in non-voting shares, known as "silent participation," still held by the German government's SoFFin financial markets stabilization fund, and the EUR750 million held by Allianz SE (ALV.XE).

After the completion of the capital increase, SoFFin's 25% shareholding in Commerzbank, which it held in addition to the non-voting shares, is expected to fall below 20%.

The capital increase, which includes subscription rights for current shareholders, was approved at the bank's annual general meeting in April. The AGM also approved the share consolidation, or reverse 1-for-10 stock split, that reduced the outstanding shares to 583 million shares from 5.83 billion shares with the price multiplied by 10.

In late April, Deutsche Bank AG, Germany's biggest bank by market value, raised EUR2.96 billion in an accelerated bookbuilding, placing all 90 million shares it had intended to sell and raising 6% more in gross proceeds than the EUR2.8 billion foreseen.

Write to Ulrike Dauer at ulrike.dauer@dowjones.com