M white
Flag
Company
Country
McKay Shipping Ltd. New Zealand
Maritime Shipping & Trading Co., Ltd.
UK
Mathiasen's Tanker Industries US
Compañia Argentina de Navegacion Mihanovich Ltda
Argentina
Morning Express
Hong Kong
O. Mauran, New York US
Massoel Gestion Maritime S.A. Switzerland
Mathiasen's Tanker Industries US
Monroe Brothers, Liverpool.
UK
Arthur H. Mathiesen Norway
Moltzaus Tank Rederi A/B, Oslo
Norway
Sunbusseeme
Sundbusserne
Norway
Sweden
Tokyo Marine K.K., Tokyo

brightblue flag; in center horizontal red stripe outlined white, interrupted by white "M".

Japan
Metcalf Motor Coasters Ltd, London.
UK
Robert Müller Schiffahrt (GmbH & Co.) KG
Germany
Theunis Muller (Sleepdienst En Avant) B.V.
Netherlands
Matas S. A.
Spain