Key TakeawaysAlcoa said it was selling off its stake in a Saudi Arabia joint venture to improve its long-term competitiveness.The company held 25.1% of the Saudi Arabia Mining Company, or Ma'aden, and the deal will give Alcoa $1.1 billion in Ma'aden stock and cash. The joint venture was formed in 2009.Alcoa shares rose to start the week. Shares of Alcoa (AA) jumped Monday as the aluminum giant said it was selling its 25.1% stake in a joint venture with Saudi Arabia Mining Co., known as Ma’aden. Alcoa said ...