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. The following transactions were reported to Bayer AG:

Transactions in the current fiscal year

Date/Place	Name/Function	Security	ISIN	Type of Transaction	Price/ Currency	Quantity	Total amount
April 23, 2013	Oliver Zühlke, Supervisory Board	Share	DE000BAY0017	Disposal	EUR 79.46	50	EUR 3,973.00
March 6, 2013	Oliver Zühlke, Supervisory Board	Share	DE000BAY0017	Disposal	EUR 77.86	20	EUR 1,557.20
March 5, 2013 Xetra	Dr. Paul Achleitner, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	400	EUR 30,448.20
March 5, 2013 Xetra	Dr. Clemens Börsig, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17
March 5, 2013 Xetra	Thomas Ebeling, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17
March 5, 2013 Xetra	Dr. Thomas Fischer, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	400	EUR 30,448.20
March 5, 2013 Xetra	Dr. Klaus Kleinfeld, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17
March 5, 2013 NYSE	Sue H. Rataj, Supervisory Board	Bayer AG American Depositary Receipt (ADR)	US0727303028	Buy	USD 101.75	273	USD 27,777.75
March 5, 2013 Xetra	Michael Schmidt-Kiessling, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17
March 5, 2013 Xetra	Prof. Dr.-Ing. Ekkehard D. Schulz, Supervisory Board	Share	DE000BAY0017	Buy	EUR 75.70	500	EUR 37,850.00
March 5, 2013 Xetra	Dr. Klaus Sturany, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	534	EUR 40,648.35
March 5, 2013 Xetra	Dr. Helmut Panke, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17
March 5, 2013 Xetra	Prof. Dr. Ernst-Ludwig Winnacker, Supervisory Board	Share	DE000BAY0017	Buy	EUR 76.12	267	EUR 20,324.17

Transactions in the past financial years effective 2005

2012: No reportable securities transactions

2011: No reportable securities transactions

2010:

Date/
Place

Name/
Function

Security

ISIN

Type of
Transaction

Price/
Currency

Quantity

Total
amount

Jan. 4,
2010
Xetra

Werner Baumann,

Management Board

DE000BAY0017

Sale

EUR 56.30

8,000

EUR 450,400.00

2009: No reportable securities transactions

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	Prof. 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)	Prof. 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.

Links

Board of Management

Supervisory Board

Annual Report

http://www.bayer.com