It said the fleet has now passed the 125m gt market with 3,640 ships.
The flag hit 100m gt in January 2014.
It is run by International Registries Inc (IRI), which is now opening a new office in the Philippines.
“The fleet has been growing rapidly largely in part to our ability to provide timely services through our decentralised model,” said Bill Gallagher, president of IRI.
“Opening an office in Manila is a natural fit for the registry as more than 35% of seafarers serving on RMI flagged vessels hail from the Philippines.”
Annie Ng, IRI's head of Asia, added: “It is our expectation that this office will be able to service crew documentation needs of our owners and operators in that area in coordination with our Hong Kong and Mumbai offices, thus improving the speed with which seafarers’ documents are issued.”
“The office is already staffed by four personnel and will be headed by Leo Bolivar who has a background working for companies like Stolt-Nielsen Philippines, Uljanik Shipmanagement, Ulstein Marine Services and Navis Maritime Services, all with respect to ship and crew management."