[2] Nationale-Nederlanden was formed in a merger in 1963 between the De Nederlanden van 1845 (The Netherlands of 1845) and the Nationale Levensverzekeringsbank (National Life Insurance Bank).

The result of the merger, because of the strong domestic position of Nationale and the international experience of De Nederlanden, was to set the company up for the future.

Cooperation strengthened the companies’ experience in group insurance and allowed Nationale-Nederlanden to expand its territory.

In 1991 NN merged, this time, with the NMB Postbank Groep, to form the ING Group.

In June 2018, the NN Group was criticized by environmental organizations for its investments in tar sands' oil companies and pipelines.