Aareal Bank has been targeted by financial investors.
The Wiesbaden institute announced on Thursday that a price of 29 euros per share was mentioned in the course of the talks.
The share certificates were traded on the stock exchange at EUR 28.68 the afternoon after the project became known.
The Bloomberg financial agency reported on it first.
Wiesbaden - The interested group is led by the companies Centerbridge and Towerbrook, said Aareal.
In addition, the Advent company is also involved.
The board of directors had been asked for open-ended discussions in order to sound out strategic options.
The financial investors would inspect Aareal's business documents.
It is uncertain whether the talks lead to a transaction or an offer to Aareal shareholders.
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Advent and Aareal are already cooperating.
Last year, the Wiesbaden-based company brought the financial investor on board as a minority owner of its IT subsidiary, Aareon.
dpa