The bad news prompted some bond investors to question whether Bayer should sweeten the terms of the deal or outright pull it, one of the sources said. The drug-to-pesticides group priced the investment grade bond on Thursday last week, with the deal closing on Tuesday. Bayer priced bonds with maturities between three to 30 years. It was the 10th largest investment grade bond deal by an industrial company this year and attracted more than $22 billion in orders, according to Informa Global Markets. The events were "not enough to trigger a material adverse change clause in bond documents for investors to ask to be paid back," said CreditSights' Brady.

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Persons: Wolfgang Rattay, Bayer, Andrew Brady, CreditSights, JP Morgan, Wells, Brady, Shankar Ramakrishnan, Ludwig Burger, Mike Erman, Paritosh Bansal, Marguerita Choy Organizations: Bayer AG, REUTERS, Bayer, Nomura Holdings, Informa Global Markets, Citigroup, Nikko Securities America, RIC, Thomson Locations: Leverkusen, Germany, Seattle