Company History

Founded in 1957 the Mainport Group has grown to become a leader in the provision of marine services to ship-owners, exporters, importers, oil companies, seismic survey companies and others involved in the maritime trades.

Under the stewardship of the Ronayne family the Mainport Group trades in South America, the Middle East, Africa, Malaysia and the European Union. The fleet consists of 10 vessels, including Tugs, Platform Supply vessels, and Seismic Support and Chase vessels. Mainport currently employs 200 people covering its shipping, stevedoring, agency operations and worldwide crew.

The origin of the Mainport Group goes back to 1957 when Finbarr Ronayne founded Ronayne Shipping Limited. This company merged and acquired other shipping companies over the years and over time the “Mainport” brand was established. In 1988 the Ronayne family finalised a friendly MBO buying out Clyde Shipping plc. Clyde was the main shareholder at that time.

The Mainport Group operate to the highest international standards, including those set by, Class and Flag State, ISM, ISPS, and ISO 9001.


Mainport – Brief History & Achievements

 2016 Mainport awarded new ISO 9001 for all group activities. Mainport acquire new tug from Turkey and rename her Celtic Fergus , after river in County Clare . This tug is 2015 built , 45 ton Bollard Pull Robert Allen design . Mainport sold older tug Celtic Banner to UK based buyer .
 2015 Ronayne Shipping act as base mangers for Kinsale Energy drilling. Worldwide market for seismic is very challenging. Mainport decide to sell to scrappage our 3 oldest ships, Mainport Oak, Mainport Ash and Mainport Elm.
Mainport Cedar wins sub charter to work for World Food Programme in Yemen for 9 months.
 2014 New build Mainport Pine delivered and commenced long term contract in seismic support sector. Mainport charter the Dina Alliance vessel for short term work.
 2013 First new-build vessel (Mainport Cedar) delivered and Charter to WesternGeco. Ronayne Shipping was base manager for ExxonMobil for all Irish drilling operations.
 2012 Purchased the Chase vessel Mainport Kells (Mainport Seismic Holdings). Ronayne Shipping was the base managers for Providence Oil.
 2011 Mainport Seismic Holdings Limited (MSHL) was formed as a Joint Venture with Maas Capital Investments B.V. MSHL signed two long term time charters with WesternGeco for two Seismic Support vessels. Malaysian shipyard, Shin Yang, commenced construction of the new vessels. Sold interest in Caspian Mainport (CMI Offshore Limited).
 2008  Purchased and operated the vessel ‘Ocean Tern’ in Canada, through NTCL.
 2006 CMI Offshore Limited was formed with Richard Keisner. The company bareboat chartered two barges to Agip in the Caspian Sea and subsequently purchased and operated a series of seventeen vessels including, tugs, barges, tanker, crew boats and platform supply vessels.Purchased the Seismic Support vessels; Mainport Oak, Mainport Ash and Mainport Elm.Purchased the Stevedoring and ship agency Company; Patrick Monahan (Drogheda) Ltd.
 2005 In July 2005 Mainport purchased the vessel ‘Ocean Mainport’ and commenced operating in the North Sea.Mainport (along with our JV partners, Sartor Shipping – now known as Atlantic Offshore) formed Ocean Mainport Holdings Limited and subsequently purchased a further four vessels from Team Atlantic.
Ocean Mainport continued purchasing one-off vessels and finally purchased the Aberdeen based off-shore supply company, Havila Rescue. In September 2008 Irish Mainport Holdings sold its shareholding in Ocean Mainport to concentrate on Seismic Support. Ocean Mainport owned and operated 16 vessels in September 2008.
 2000 In 2000 Mainport were awarded a 10 year contract for 3 large tugs to service the Shannon estuary on the west coast of Ireland. We continue to operate this service.
1988 Ronayne family organise a friendly MBO buying Cork & Shannon companies from Clyde Shipping plc and continued to work as base operators for various oil companies who came to Ireland to explore and chartered in many AHTS and Supply vessels to support these exploration projects over the years.
1979 Mainport old logoMainport were awarded a contract for two offshore vessels to support the Kinsale gas field and continues to service this field with one multi-purpose support vessel today.
1974 The company first entered into offshore business when Marathon came to Ireland to explore for Oil & Gas and discovered Ireland’s first and still producing gas field Kinsale Gas field. Mainport acted as agents and base operators for this project over the years from exploration to production and continue to do so.
 1973 Ronayne Shipping merged with Clyde Shipping’s Irish interests to form ‘Mainport’.
 1957 Ronayne Shipping was formed in 1957 as a ship agency and stevedoring company by Finbarr Ronayne.