On February 6, 2023, Jeff Ubben announced that he has contacted fellow shareholders in Bayer Aktiengesellschaft, investors and sources familiar with the matter, in an apparent attempt to rally support for big changes at the Company. Jeff Ubben stated that the campaign increases the pressure on non-executive Chairman Norbert Winkeljohann, who has faced calls from shareholders for the swift replacement of Chief Executive Werner Baumann. Jeff Ubben added that he would prefer an external candidate to replace Werner Baumann and that while a break-up of the group may not be necessary, it needs to be considered.