Standard & Poor's Global Ratings (S&P) Affirms Ecopetrol's Stand-Alone Credit Profile and Revises Its Global Credit Rating [Yahoo! Finance]
Standard & Poor's Global Ratings (S&P) Affirms Ecopetrol's Stand-Alone Credit Profile and Revises Its Global Credit Rating [TheStreet.com]
Standard & Poor's Global Ratings (S&P) Affirms Ecopetrol's Stand-Alone Credit Profile and Revises Its Global Credit Rating
Decisions of Ecopetrol's Board of Directors
Ecopetrol S.A. obtains authorization to carry out a debt management transaction of up to USD 1.25 billion [Yahoo! Finance]