OREANDA-NEWS. April 19, 2011. BM&FBOVESPA hereby announces the second preview for the Ibovespa theoretical index, which will be valid for the period of May to August 31, 2011, based on the closing of the April 15, 2011 session. The preview registered no changes to the Ibovespa portfolio.

The five stocks with the heaviest weight in this index were: Vale PNA (10.498%), Petrobras PN (10.271%), OGX Petroleo ON (4.716%), Itauunibanco PN (4.101%) and BMFBOVEPA ON (3.706%).

For purposes of comparison, the stocks with the heaviest weight in the Ibovespa portfolio announced on January 3, 2011 were: Vale PNA (10.758%), Petrobras PN (10.460%), OGX Petroleo ON (4.806%), Itauunibanco PN (3.829%) and BMFBOVESPA ON (3.739%).

The Exchange also announces hereby the second previews of the other 16 indices. The changes are here.

BM&FBOVESPA regularly announces the previews of the new indexes 30 days, 15 days and one day prior to the new quarterly portfolio. The methodology for the MidLarge Cap and Small Cap indices defines their shares 15 days prior to the new portfolios coming into effect. The Exchange can, however, bring forward the announcement of previews, or even increase their number.