The Greek operator’s New York-listed stock, which trades under the symbol “NMM”, jumped 11.17% in the hour leading up to the close before topping out at $10.84.

Observers note the spike followed an upgrade issued by Amit Mehrotra, an equity analyst at Deutsche Bank.

The researcher stamped the operator with a “buy” rating, a move he attributed to a recent decline in the company’s share price.

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