Is this as good as it gets for the ocean shipping company?Shares of Zim Integrated Shipping Services (ZIM -14.66%) have more than doubled so far in 2024, fueled by geopolitical tensions that have caused ocean shipping rates to rebound.At least one analyst believes the rally is running out of steam. Shares of Zim traded down 15% as of 10:30 a.m. ET after Citigroup downgraded the stock to a sell.Is this as good as it gets?Zim is one of the world's 20 largest ocean shipping companies. The stock was caught in t ...