SAO PAULO, June 29 (Reuters) - Brazilian stocks opened higher on Monday, as investors flocked to new shares of VisaNet, sparking buying of industrial, financial and commodity stocks.

VisaNet's (VNET3.SA: Quote, Profile, Research) $4.3 billion initial public offering on Thursday was the country's largest ever and the largest in the world so far this year. Visanet jumped as much as 14 percent within the first 15 minutes of trading, only to give up some of those gains later.

"The Bovespa is tending higher mainly because of VisaNet," said Eduardo Cortez, an analyst with Gradual Investimentos in Sao Paulo. "There's always a tendency for other big companies to accompany those movements."

The benchmark Bovespa index .BVSP rose for the second day in three, climbing 1.2 percent in morning trading to 52,128.65 points, led by VisaNet, which rose 11.4 percent to 16.72 reais around mid-day.

The two stocks with the biggest weighting in the 65-share index rose as commodities edged higher.

State-controlled energy company Petrobras (PETR4.SA: Quote, Profile, Research) rose 2.1 percent to 32.93 reais, and mining giant Vale (VALE5.SA: Quote, Profile, Research) gained 0.9 percent to 30.40 reais.

Commodities also gained. Crude oil CLc1 rose 2.2 percent, while copper HGN9 rose 2.6 percent.

Other strong movers included bank Itau Unibanco (ITUB4.SA: Quote, Profile, Research), which rose 2 percent to 31.53 reais, and steelmaker Gerdau (GOAU4.SA: Quote, Profile, Research), up 1.84 percent to 26.07.

For the past week, the index had been pushing against the 51,700 point-mark, said Daniel Marques, an analyst with Agora Investimentos. The Bovespa futures contract due in August INDQ9 gained 0.9 percent ot 52,680.