Bosses at only 16% of UK ports have made "significant or practical plans" for Brexit.
Executive search firm Odgers Berndtson quizzed leaders at 100 terminals to assess readiness for the country leaving the European Union.
The majority of respondents had either carried out “only some high level planning” or had done nothing at all.
“The ports industry is keen to seize on any opportunities arising from Brexit, but this is the first real indication of what’s actually happening outside ports like Dover,” said Paul Butterworth, head of the maritime and shipping practice at Odgers Berndtson.