Disclosure of Securities Transactions

Disclosure of securities transactions by members of the Supervisory Board and Board of Management

To comply with Section 15 a of the German Securities Trading Act, members of the Board of Management and Supervisory Board and their close relatives are required to disclose all transactions involving the purchase or sale of Bayer stock where such transactions total EUR 5,000 or more in a calendar year. Bayer publishes details of such transactions immediately on its website and also notifies the German Financial Supervisory Authority accordingly. This information is provided to the company register for archiving.

The following transactions were reported to Bayer AG in 2008:

Transactions in the current fiscal year

So far this year no relevant reports have been filed by members of the Management Board and Supervisory Board of Bayer AG or their families.

Transactions in previous fiscal years

2008:

Date/ Place	Name/ Function	Security	ISIN	Type of Transaction	Price/ Currency	Quantity	Total amount
Dec. 22, 2008 Over the counter	Willy Beumann, Supervisory Board	Share	DE0005752000	Buy	EUR 39.20	68	EUR 2,665.60
May 13, 2008 Xetra	Willy Beumann, Supervisory Board	Share	DE0005752000	Buy	EUR 55.72	261	EUR 14,542.92

2007:

Date/ Place	Name/ Function	Security	ISIN	Type of Transaction	Price/ Currency	Quantity	Total amount
March 29, 2007 Xetra	Dr. Wolfgang Plischke, Management Board	Share	DE0005752000	Buy	EUR 47.70	5,300	EUR 252,810.00
January 10, 2007 Over the counter (Expiration date: May 23, 2008)	Dr. Wolfgang Plischke, Management Board	PROTECT Discount Share Certificate (Underlying instrument: Share)	FI: DE000SCL57K9 (Underlying instrument: DE0005752000)	Buy	EUR 40.12 (Strike price: EUR 27.50 / Price multiplier: 1)	350	EUR 14,042.00

2006: No reportable securities transactions
2005: No reportable securities transactions

Information filed with the company by members of the Board of Management and Supervisory Board shows that, on the closing date for the financial statements, their total holdings of Bayer AG stock or related financial instruments were equivalent to less than 1% of the issued stock.