[6] Commerzbank founded Comdirect, which was registered in December 1994 as a private limited company (GmbH - Gesellschaft mit beschränkter Haftung).

[12] The Commerzbank and Deutsche Telekom agreed on the cooperation of their subsidiaries, the Comdirect Bank and T-Online International.

[28] The first dividend was distributed in 2004 and in 2005,[29] the German retail banking of American Express was acquired, which helped to grow the customer base significantly.

[32] Even during the global financial crisis from 2007, the business remained stable; the Comdirect Bank profited from the increase in transactions in securities trading.

[40] With this investment, the Comdirect Bank strengthened securities trading and financial information business at the same time.

[44][45] The company was the first bank in Germany to publish an Amazon Alexa skill, for example, and later added support for Google Home.

[47] In late 2019, Commerzbank entered into talks with Petrus Advisers to buy its 7.5% stake in Comdirect and take over the entire online bank.

[49][50][51][52] In 2009, the Comdirect Bank and the Stuttgart Stock Exchange founded the Stiftung Rechnen, a non-profit foundation with a registered office in Hamburg and headquarters in Quickborn.

[53] Its primary goal is to support knowledge of mathematics with a focus on young peogle to encourage a joy of numbers and calculation.

[54] Johanna Wanka, former Federal Minister of Education and Research, is the patron of the Stiftung Rechnen;[55] Christian Rach, a star-rated chef and author, is one of its prominent ambassadors.

[62] Though there was no financial or material damage, the company regretted the mistake, apologized to all affected customers and informed them about the extent of third-party access.