The SEC said Jaspen and Supranonok used contracts-for-differences, which are derivatives allowing for leveraged stock price bets, to trade from 2010 to 2015 in Panera Bread Co, RadioShack Corp (Other OTC: RSHCQ - news ) and other companies based on press releases stolen from the three newswires.
In the context of the input sentence, determine the relationship between 'RadioShack' and 'trade'.
Options: industry, owned by, member of, currency