- SIERRA 2 Pleasure craft 229000097 1059863 ITPES
- SIESTA MIA Sailing 256003912 — MTJCO
- SIFNOS I Cargo 249710000 1047653 IDTBA
- SIGIRIYA Pleasure craft 249000313 — CLASS B
- SIGNAL EIGHT Pleasure craft 256002494 — CLASS B
- SIGNAL EIGHT Pleasure craft 256003013 — —
- SIGNE Pleasure craft 256004112 — CLASS B
- SIGNITE Pleasure craft 256004110 — CLASS B
- SIIRT Other 229221000 9644196 — —
- SIKINOS Tanker 256462000 9460851 MALTA OPL
- SILENDI Tanker 248333000 9508720 ITRAN
- SILENT WORLD Pleasure craft 249705000 9763930 TROGIR
- SILK Sailing 256002049 — —
- SILVER DAWN Pleasure craft 256004340 — BEAULIEU
- SILVER MANTA Pleasure craft 256004911 — CLASS B
- SILVER SEAS Pleasure craft 249000481 — —
- SILVER WIND Pleasure craft 248420000 9721592 IMPERIA
- SILVERBACK Sailing 256004479 — —
- SILVERSTARS Pleasure craft 215000396 — —
- SILY Pleasure craft 215998000 9679347 VOULIAGMENI
- SIMBORA ONE Pleasure craft 256004777 — CLASS B
- SIMO Passenger 229000758 — MTMMLA
- SIMONA Cargo 248018000 9437763 ES SVG
- SIMPLY LOVELY Pleasure craft 256004943 — —
- SINE A Cargo 256318000 9343089 MATAT
- SINGULAR Sailing 229000673 — CLASS B
- SIR L Pleasure craft 256004302 — —
- SIRENS Pleasure craft 256002188 — —
- SIRENUSE Pleasure craft 256003305 — —
- SIRIUS I Pleasure craft 256002825 — MARMARIS
- SISA V Pleasure craft 256004490 — CLASS B
- SIXTINE Cargo 248742000 9831165 IEDUB
- SIXTY SIX Pleasure craft 256005322 — CLASS B
- SIZE Pleasure craft 256986000 9773973 GOCEK
- SKADE Pleasure craft 256002055 9778272 THHKT
- SKATZOURA Cargo 249183000 9566954 ID MEQ
- SKIATHOS Cargo 249158000 9497402 DURBAN
- SKOPELOS I Cargo 249185000 9497397 CN NTG
- SKORPIOS Sailing 256003357 — —
- SKYE Sailing 256001438 — —
- SKYELARK 2 Sailing 256001578 — CLASS B
- SKYTHIA Cargo 248087000 9423920 YEONGHEUNG S.KOREA
- SLAM Pleasure craft 256004587 — CLASS B
- SLAVYANKA Cargo 256434000 9937309 UV NVP
- SLIM SAILS Sailing 248000149 — CLASS B
- SLIP AWAY Pleasure craft 248000784 — —
- SM8 08 61 Other 256000208 — —
- SMILEY Pleasure craft 256005272 — PORTO MONTENEGRO
- SMILING T Pleasure craft 256990000 9649017 —
- SMOOTH OPERATOR Pleasure craft 256236000 9586784 SIBENIK
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