Taiyo Yuden shares rose 7.51% on Wednesday after Situational Awareness disclosed a stake in the Japanese capacitor maker, prompting an initial read of fresh buying. The filing, however, reflected a position that had already been sharply reduced. Situational Awareness's stake had climbed to 16.61% in July before dropping to 4.41% weeks later. The move came as margin calls forced the hedge fund to cut assets under management, or AUM (total assets managed), from $45 billion to $10 billion.