By Paulo Trevisani

BRASILIA--Brazil stocks were flat Thursday morning amid positive U.S. job data, worrisome inflation data in China and earnings announcements by local companies.

The main Sao Paulo index was trading at 55849 points at 9:55 a.m. EDT, up 0.08% from Wednesday's close of 55804 points, which represented a 0.8% decline for the day.

Earlier Thursday, Brazilian petrochemical company Braskem SA (BAK, BRKM5.BR) reported net profit growth of 49% in the first quarter, to 227 million Brazilian reais ($112.9 million), up from BRL152 million in the same period the year before. Net revenue rose 15% to BRL9.3 billion.

Braskem stock was down 3.26% to BRL8.32.

A decline in jobless claims in the U.S. was an upward impetus for Brazilian stocks, which tend to be heavily influenced by the U.S. market. Many Brazilians heavyweight stocks are traded in the U.S. and the country is also an important trade partner for Brazil.

However, Brazil's largest trade partner, China, reported an uptick in inflation to 2.4% in April from 2.1% in March, reducing the chances of Chinese authorities implementing measures to stimulate the economy. China imports mainly iron-ore, soybeans and other raw materials from Brazil.

Iron-ore producer Vale SA (VALE3) traded at BRL14.46, down 0.1%, while state-owned oil giant Petroleo Brasileiro SA (PETR4) was up 0.1% to BRL20.32.

Another oil company, OGX Petroleo e Gas Participacoes SA (OGXP3), controlled by Brazilian billionaire Eike Batista, is expected to report earnings after the markets close. Its stock was down 0.6% at BRL1.75.

Brazil's largest publicly traded airline, Gol Linhas Aereas Inteligentes SA (GOLL4), was up 1.1% to BRL12.33 and Brazil's largest private-sector bank, Itau Unibanco Holding SA (ITAUB), was up 0.6% to BRL35.22.

Leading the declining stocks was real-estate developer Brookfield Incorporacoes SA (BISA-B), a unit of Canada's Brookfield Asset Management Inc. (BAM.A.T). It was down 4.66% to BRL1.00.

Another real-estate company, Gafisa SA (GFSA3), was leading the gainers with a 2.11% increase in its stock, to BRL1.99.

Write to Paulo Trevisani at paulo.trevisani@dowjones.com

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