In December 2014, investors who had purchased American Depository Shares (ADSs) of Petrobras on the New York Stock Exchange filed a securities class action in the Southern District of New York, alleging violations of the Securities Act of 1933, the Securities Exchange Act of 1934 , and (in an amended complaint) Brazilian securities laws.
In the context of the input sentence, determine the relationship between 'Petrobras' and 'New York Stock Exchange'.
Options: developer, industry, currency, stock exchange