SAO PAULO — Citigroup Inc. is planning to sell at least 82 million of its shares in Brazilian credit-card networking services provider Redecard SA through a secondary offer on the Brazilian Stock Exchange, or Bovespa, according to the preliminary prospectus of the offer published late Monday.

The shares will be sold in Brazil and also to foreign investors in the form of Global Depositary Receipts, or GDRs. Each GDR will represent two common shares.

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