A shareholder lawsuit alleges Dynagas kept up a lie for roughly a year that it had the cash flow to support its dividend to buoy up its share price and keep from diluting the founding family’s stake.

The lawsuit, filed in a US federal court in Manhattan by shareholder Mario Epelbaum, accuses the New York-traded LNG carrier ­owner of obscuring the fact it had taken lower charter rates for two of its six ships, negatively ­affecting cash flows.