Stephens, Mawson & Goss acquired its first steamer in 1880 and was wound up in 1895, reforming as Stephens, Mawson & Co. Arthur Mawson took over in 1901 and traded under his own name at Cardiff until retirement and fleet sale in 1915. The source inconsistently dates the Cardiff move to 1890 and 1901.
Keep the explicit scope label independent; no alias or company identity is inferred.