BRASILIA- Shares in Brazilian planemaker Embraer EMBR3.SA fell more than 1% at the open on Monday, following a Reuters report that Boeing is set to face a European Union antitrust investigation into its bid for a controlling stake in Embraer's commercial aircraft arm. 

Embraer shares traded as low as 19.12 reais, a decline of as much as 2.0%, underperforming the broader Bovespa index which was down a maximum of 0.5% in early trading.

($1 = 4.16 reais)

(Reporting by Jamie McGeever; Editing by Catherine Evans) ((jamie.mcgeever@thomsonreuters.com; +55 (0)11 97189 3169; Reuters Messaging: jamie.mcgeever.reuters.com@reuters.net))