SAO PAULO--Multiplus SA (MPLU3.BR), the frequent-flyer program that was spun off from leading Brazilian airline Tam in 2010, said Friday it is seeking to raise about 800 million reais ($410 million) through the sale of new shares.

The offer of an undisclosed number of voting shares by Multiplus is still being analyzed by capital-markets association Anbima, Multiplus said in a regulatory filing.

The company also said that it may opt to sell additional shares beyond the BRL800 million should there be sufficient demand.

Tam, Brazil's biggest airline by market share, was merged with Chile's Lan last year to form Latam Airlines Group (LFL, LAN.SN), the region's biggest carrier and one of the world's 10 biggest airlines. The combined companies expect to save $600 million to $700 million a year by combining their operations, Latam said last year. One possible additional source of savings could come from the merger of Lan Airlines' LanPass frequent flyer program with Tam's Multiplus, finance chief Alejandro De la Fuente said in November.

"We're in the process of harmonizing" LanPass and Tam's Multiplus and are studying a possible merger, he said at the time.

Multiplus was the first customer-loyalty program in Brazil to list shares on the Sao Paulo exchange. This year, however, Smiles, the frequent-flyer program of Gol Linhas Aereas Inteligentes (GOL, GOLL4.BR), could also list shares on the exchange. Last month, Smiles published a preliminary prospectus for its share sale, but didn't say how much it planned to raise, nor did it specify when it will carry out its initial share offering.

Gol is Brazil's second-biggest airline.

Write to Paulo Winterstein at paulo.winterstein@dowjones.com

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