SeaQuest Shipmanagement is an independent,  privately owned provider of ship management, crewing, ship operation and maritime consultancy services for third parties.

For 30 years we have been feeling and acting as partners for the Owners who selected us for the management of their ships and always run their vessels to our best.
A short chain of command allows us to take the most critical decision in a fast and efficient way.

We focus on the continuous improvement of the quality of our seafarers, shore staff, management procedures and on the highest quality/price ratio in the investment of our Clients rather than on the sole growth on the size of the managed fleet. This explains why we score very low technical off-hires, actual vs. budgeted opex variations and H&M claims for all vessels in our management.

With service centres in Italy, Croatia, Singapore, Switzerland, China and a representative office in Japan, we manage a twenty-strong fleet, mainly composed by bulk carriers, container ships, ro-ros and chemical tankers.
We have also a wide experience of crude oil and product tankers, OBOs, LPGs, livestock carriers, anchor handlers and PSVs.

Our safety management system has been satisfactorily applied for several decades in the management of all types of ships and is continuously updated to the highest standards. Our Safety & Quality manuals and ship management procedures are certified by RINA in conformity to ISO 9001 standards.

Fully owned crewing agencies in the Philippines and Croatia and carefully selected crewing partners in other key recruiting nations such as Ukraine, India, Myanmar, China, allow us to man all our ships with experienced and professional offices and ratings.

We are members of InterManager, Intertanko and actively contribute to BIMCO's Shipping KPIs project.


Click on below icon to download SeaQuest Shipmanagement general presentation:

Why SeaQuest

  • All our top management has a technical background and is directly involved in the daily management of the fleet
  • Outstanding safety, Port State Control, technical off-hires and insurance claim records
  • Excellent cost control over agreed operating expenses and drydocking budgets
  • First-tier purchasing power: nothing less than the largest ship management groups
  • A pragmatic approach to technical and crewing issues, always resulting in the prompt and effective solution of problems
  • Impaired ship account reporting flexibility to suit the most exigent ship owners' administration departments
  • Thanks to the medium size of our organization, we can maintain our commitments:
    • An individual approach to every Shipowner - we truly take care of the needs of each of our Clients, no matter how many ships he has with us.
    • Tailor-made ship management - we are very flexible and able to adapt our ship management system to the specific needs of the client, if required also through dedicated companies with autonomous management teams.


Our performance

  • Average Overall Operating Expenses: 5.3% below approved budget

  • Average Dry Docking performance: 4.9% below approved budget; zero days delay

  • Average Technical off-hires: 0.4 day/year x vessel (99.8% operational availability)

Values are given for last two years operation of vessels under management.
Our performance is benchmarked within the Shipping KPIs project.


OPEX quotations

Should you be interested in receiving a quotation for a specific vessel, kindly complete the "Request of Quotation" e-mail form available at below link and we shall contact you:


Our Vision, Mission & Values


To be recognized by Ship Owners as a highly committed and reliable partner for the management of their vessels.


To strongly contribute to the safekeeping of our clients’ assets and to enhance the profitability of their shipping business by providing skilled and committed seafarers and high maintenance standards, ensuring the best operational reliability and strictly controlling the ships' operational expenditures.
We target zero accidents by endeavoring to continuously improve the safety of operations and minimize the environmental impact on all the managed fleet.


To commit ourselves to sound and responsible business principles and ethics.
To show respect and care for our people, our Clients and the global community.
To be transparent and promote teamwork and open communication channels.
To build value for our clients, always keeping the integrity and high professional standards.
To strive for continuous improvement.
To stay ahead of market developments.
To build our future through innovation and new business opportunities.
To acquire, develop and share knowledge.


Our people

SeaQuest personnel, both onshore and onboard, have a wealth of knowledge and experience, encompassing every aspect of the ship management practice.

Qualified naval architects, marine engineers, master mariners and superintendents are the core of our office staff; collectively they form a united team sharing SeaQuest's vision, values and goals.

Each ship's superintendent is individually selected with proven sailing experience and ship management knowledge.

We have a growing pool of 900 seafarers. The roster includes European and Filipino officers suitably familiarized with our office staff and fully trained to our procedures.


We always offer job opportunities to highly committed people: if you are a suitably qualified and experienced naval architect, marine engineer, master mariner, superintendent or seafarer, you may submit your Curriculum Vitae in English language, complete with photo addressed to the Recruitment Office - Shore, to one of our service hubs in Singapore, Rijeka or Genoa (see contacts for address details).

Management Team

Vittorio Portunato Fleet Coordinator, Genoa

Vittorio Portunato graduated in Naval Architecture and Marine Engineering at the University of Genoa and in 1987 founded Portunato & C. - today SeaQuest Shipmanagement - together with his brother Sebastiano.

Vittorio gained extensive experience and knowledge in ship management and new building project management and steadily expanded the company's activity over the years.

Send Vittorio Portunato an email

Sebastiano Portunato Director, Geneva

Sebastiano Portunato is a Naval Architect and Marine Engineer graduated from the University of Genoa. He founded Portunato & C. - today SeaQuest Shipmanagement - in 1987, together with his brother Vittorio.

For many years Sebastiano has been in charge of the technical and operational management of a fleet of tankers.

Today he is the Director of our office in Geneva. He is also the Director of the European branch of SeaQuest Marine Project Management Ltd., a world-class provider of shipbuilding project management and consultancy services.

Send Sebastiano Portunato an email

Massimo De Vincenzo Director, Genoa

Massimo De Vincenzo, a University of Genoa graduate in Naval Architecture and Marine Engineering, gained extensive experience in ship management when working as a technical executive for a Monaco Monte-Carlo ship management company, before joining Portunato in 1994.

He was appointed Managing Director in 1997 and has contributed greatly to the company's development and organization.

Send Massimo De Vincenzo an email

Goran Zivkovic Director, Rijeka & Singapore

Goran Zivkovic joined SeaQuest Shipmanagement in 2009. He has 23 years’ experience at sea, the majority spent as Chief Engineer on various types of merchant vessels, and three years as a Technical Superintendent for a tanker management company in the USA.

Due to his vast experience in technical shipping matters, and after having been accountable for the coordination of our superintendents, he took on the fleet management responsibility in 2012 and was appointed director of our Rijeka office in 2013.

Send Goran Zivkovic an email

Gian Maria Celle Marketing, Genoa

A University of Genoa graduate in Naval Architecture and Marine Engineering, Gian Maria Celle joined SeaQuest Shipmanagement in June 2010.

Gian has over 20 years’ experience in commercial and marketing senior management roles in business-to-business trading and industrial sectors, including cruise vessels shipbuilding and the provision of marine technical services to merchant and passenger ships.

Send Gian Maria Celle an email

George Kynigos Commercial, Singapore - Geneva

A Naval Architecture and Shipbuilding graduate from the University of Newcastle, and a Law postgraduate from Cardiff University and Southampton University (LL.M), George Kynigos has gained experience in shipping, broking, commercial, operations, marine insurance and legal matters, having previously worked for a P&I Club and three European shipowners in London.

With over 30 years experience and knowledge in dry bulkers, product and crude oil tankers, containers, LNGs and VLGCs, George served as a shipping company director/senior executive/VP/COO and as a main board director for West of England P&I and Gard P&I, Marine and Energy.

Over the last 6 years, George has established ventures with ship management providers in Europe and the Far East and is responsible for global commercial management matters for SeaQuest.

Send George Kynigos an email


We have been in the ship management and marine technical consultancy market since 1987, when brothers Sebastiano and Vittorio Portunato founded Portunato & C. S.r.l., offering tailor-made and cost-effective ship management solutions at the highest standards.

Since inception, the company has been devoted to the wet and dry bulk sectors.

During the late 1990s we specialized in the management of OBOs,  which was one of the most complex vessel types of that time,  reaching a deadweight capacity of 555,000 mt.

After the decline of the OBO type, the activity was primarily focused on crude oil, product and chemical tankers, chartered to all main oil majors and traders and worldwide operating. Among the most significant achievements, one Aframax tanker was successfully run for a period of 5 years in lightering operations in the U.S. Gulf with no technical off-hire.

Together with tankers, we also managed bulk carriers, which has recently become our core business, and have gained good experience with gas carriers, general cargo, container feeders, RO-ROs, livestock carriers and offshore support vessels over the years.

We started the crewing activity around 2005 and have set up our own offices and partnerships with recruiting agents in key areas such as Croatia, Ukraine, India, the Philippines, Myanmar and China.

Through hard work and positive achievements our group has grown steadily and now has head offices in Geneva and Singapore, management offices in Genoa and Rijeka, and representative offices in Tokyo and Dalian, which operated under the brands of SeaFlag and SeaQuest Oriental. All brands merged into SeaQuest in December 2014.