The campaign increases the pressure on non-executive Chairman Norbert Winkeljohann, who has faced calls from large shareholders for the swift replacement of Chief Executive Werner Baumann, who engineered Bayer's troubled Monsanto takeover. The approaches come after Ubben's activist investment fund Inclusive Capital Partners said last month it had bought a 0.83% stake in Bayer. David Herro, deputy chairman of Harris Associates, told Reuters in brief emailed comments that Ubben had contacted him to discuss Bayer. A spokesperson said Bayer was always open to a constructive dialogue with shareholders and declined to comment further. Investors who have publicly called for a swift CEO change hold at least a combined 6.7% in Bayer, according to Refinitiv data.

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