Arista

The provided news articles do not contain any information about an organization named "Arista." The articles focus on Iran's claim of a foreign ship getting stuck in the Strait of Hormuz, which is reportedly tied to Tehran. One article specifically discusses Iranian oil shipping magnate Mohammad Hossein Shamkhani, who has been sanctioned by Western countries due to his involvement in Iran's "shadow fleet." The context involves maritime incidents in a strategically important waterway and sanctions related to Iran's oil industry. Therefore, no summary regarding "Arista" can be generated from the given text.