Petrobras, Sarepta Therapeutics, Micron Technology and Novavax are big market movers

MarketsAssociated Press

Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:

NYSE

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Petrobras SA, down $1.77 to $11.16

The Brazilian oil company's stock tumbled following the country's hard-fought presidential race in which President Dilma Rousseff won re-election.

NQ Mobile Inc., up 52 cents to $9.46

The mobile Internet services company filed its 2013 annual report and accounting firms did not find any fraudulent behavior alleged by a research firm.

Chiquita Brands International Inc., up 20 cents to $14.36

The fresh produce company agreed to sell itself to two Brazilian companies for about $681 million, or $1.3 billion including debt.

Halliburton Co., down $3.39 to $52.39

The oilfield services company's stock lost ground as oil prices continue declining, falling below $80 per barrel on Monday.

Nasdaq

Sarepta Therapeutics Inc., down $7.65 to $15.91

The Food and Drug Administration wants additional data on the biotechnology company's potential muscular dystrophy treatment.

Micron Technology Inc., up $1.24 to $32.30

The technology company's board of directors approved a stock buyback program for up to $1 billion worth of outstanding shares.

Novavax Inc., up 67 cents to $5.80

The drug developer expects to begin early stage studies involving humans of its potential Ebola vaccine in December.

Pain Therapeutics Inc., down $2.20 to $1.95

Pfizer Inc. ended its deal with the biotechnology company to develop a potential extended-release version of the pain killer Oxycodone.