| Year | Number of ships | GRT, or DWT | Remarks |
| 1947 | 1 | 14,480 GRT |
|
| 1957 | 61 | 2,000,000 | 41 tankers 1 m dwt; 20 dry cargoes 1 m dt |
| 1958 | 64 | 1,003,000 GRT | 56 tankers; new-buildings 39 (61%) |
| 1959 | 64 | 1,175,000 GRT | Tankers over 6000 dwt. 86% < 10 years of age; 8th global position for tankers over 6000 GRT, of 0 - 5 years of age = 59%. |
| 1961 | 72 | 1,942,000 |
|
| 1962 | 74 | 2,186,834 | 2nd in the world after “Ludwing” |
| 1965 | 70 | 1,400,000 GRT | 55 tankers; 15 dry cargo |
| 1973 | 62 | 4,326,418 GRT | 46 tankers (82%) |
| 1974 | 64 | 4,403,327 GRT | 2 OBOs 224,677 GRT (81%); 47 tankers (14%); 15 dry cargoes (5%) |
| 1975 | 46 | 1,786,000 GRT | 31 tankers; 15 dry cargoes |
| 1976 | 51 | 3,666,227 | 5 VLCCs (April) |
| 1981 |
| 1,605,000 GRT | A crisis started in dry cargoes |
| 1983 | 19 | 2,046,145 | Since 1980 the fleet had a decadence; also 26% of dwt tonnage was old |
| 1984 | 33 | 2,400,000 |
|
| 1985 | 32 | 2,132,995 | From other source: 31 ships of 1.9 m GRT; 9 tankers, 2 combos, 20 bulk carriers |
| 1989 | 26 | 958,602 |
|
| 1991 | 24 | 673,562 | A new generation took over |
| 1995 | 18 |
| Niarchos passed away in 1996 |
| 1998 | 13 | 467,573 |
|
| 2000 | 11 |
| 4 tankers; 2 bulk carriers & 5 product carriers; company turned into a fleet renewal & growth, by ordering 1 ULCC and 2 Suezmax tankers (in Daewoo). |