Increased costs means there will be no more Guernsey Waterfront Marathon.
Peter Head, one of the event organisers, has said the costs incurred from the 2018 run would require increased sponsorship funding and additional work which could not be paid for.
He also said the costs imposed by Trading Assets had "increased exponentially, in some cases by up to nearly 90%."
One big disappointment will be for overseas runners with them representing 85% of entrants last year.
Mr Head said he feels it is "the end of an era."