Sea Nebula Corporation Ltd Flag

This company is based in Dhaka  The flag is horizontal red-white-red, a thin blue horizontal stripe in the middle of the white one and a large black letter S (sans-serif) in the centre of the flag, slightly extending beyond the white stripe. 

Additional information on the company: "HEGGE SHIPPING LINE the oldest shipping company in Bangladesh established in 1954 merged with SEA NEBULA CORPORATION LTD in the year 1983."