The yield on the notes climbed to more than 10 percent on March 21, 2014, the day after Gunvor co-founder Gennady Timchenko was sanctioned by the U.S. for his ties to Vladimir Putin.
In the context of the input sentence, determine the relationship between 'Gunvor' and 'Gennady Timchenko'.
Options: manufacturer, founded by, business division, publisher