Vestas Wind Systems — Director's Dealing 2010

Aug 20, 2010

Finanstilsynet (The Danish Financial Supervisory Authority) Gl. Kongevej 74 A 1850 Frederiksberg C Denmark

Randers, 20 August 2010 Insiders' trading - announcement No. 9/2010 Page 1 of 1

Announcement of Vestas Executives' trading with securities

In accordance with section 28 a of the Danish Securities Trading Act, Vestas Wind Systems A/S is required to publish information regarding trading in Vestas Wind Systems A/S shares and securities by Executives and persons closely associated with an Executive.

The statement is based on reports which Vestas Wind Systems A/S has received from some of the Executives on 19 August 2010.

Name:	Ditlev Engel
Position of Executive:	President & CEO, Vestas Wind Systems A/S
Related party:	Marianne Engel
Issuer:	Vestas Wind Systems A/S
ID code:	DK0010268606
Type of securities:	Shares
Type of transaction:	Purchase
Date of trading:	19 August 2010
Place of transaction:	Nasdaq OMX Copenhagen
Number of securities traded:	2,000
Market value (DKK) of securities traded:	DKK 497,955.10

Name:	Michael A Lisbjerg
Position of Executive:	Member of the Board, Vestas Wind Systems A/S
Issuer:	Vestas Wind Systems A/S
ID code:	DK0010268606
Type of securities:	Shares
Type of transaction:	Purchase
Date of trading:	19 August 2010
Place of transaction:	Nasdaq OMX Copenhagen
Number of securities traded:	94
Market value (DKK) of securities traded:	DKK 23,340.20

Any questions may be addressed to the Executive Management at Vestas Wind Systems A/S, telephone +45 9730 0000.

Yours sincerely Vestas Wind Systems A/S

Ditlev Engel President and CEO