 HOUSTON, April 15, 2021 GLOBE NEWSWIRE -- ION Geophysical Corporation NYSE: IO the Company or ION today announced it is revising the previously announced settlement date of its Exchange Offer and Rights Offering. The extension is to enable all of the required information, exchange and clearing agents to finish validating, tabulating and processing the subscriptions given the complexity of the transactions. The Company now expects to settle on or about Monday, April 19, 2021. 