Atlantic Corp.
Portsmouth NH
The Atlantic Corp. shipyard was established in 1918, on the site of a failed paper factory in the area of the Piscataqua River Bridge, and folded in 1920. The company also built a housing estate for its workers, adjacent to the shipyard. The shipyard site is now occupied by a Boise Cascade plant and a National Gypsum plant. You used to be able to see the shadow of the old launch ways under the water, in line with the axis of the National Gypsum plant, which must have been built on the foundations used by the shipyard's fabrication shop. The building with the black roof is believed to be the only one on the site that dates back to the shipyard. The housing estate is just to the northwest, separated from the shipyard by I-95.
| USSB # | O/N | Name | Customer | Type | GT | Delivered | Notes | |
| 1 | 987 | 218185 | Kisnop | USSB | freighter | 5,500 | Aug 1919 | to Britain 1941 as Empire Dabchick, torpedoed and lost 1942 |
| 2 | 988 | 218695 | Babboosic | USSB | freighter | 5,500 | Sep 1919 | scrapped 1933 |
| 3 | 989 | 219119 | Portsmouth | USSB | freighter | 5,500 | Oct 1919 | scrapped 1931 |
| 4 | 990 | 219321 | Nipmuc | USSB | freighter | 5,500 | Dec 1919 | scrapped 1936 |
| 5 | 991 | 219544 | Norumbega | USSB | freighter | 5,500 | Feb 1920 | scrapped 1931 |
| 6 | 992 | 219998 | Brookline | USSB | freighter | 5,500 | May 1920 | later O'Brien Brothers 1931, Valiente 1940, Guatemala 1941, torpedoed and lost 1942 |
| 7 | 993 | 220127 | Springfield | USSB | freighter | 5,500 | June 1920 | scrapped 1936 |
| 8 | 994 | 220353 | Tolosa | USSB | freighter | 5,500 | Sep 1920 | to Britain 1940 as Empire Dorado, in collision and lost 1941 |
| 9 | 995 | 220448 | Pachet | USSB | freighter | 5,500 | Nov 1920 | scrapped 1932 |
| 10 | 996 | 220710 | Pagasset | USSB | freighter | 5,500 | Dec 1920 | later Colabee 1937, torpedoed 1942 off Cuba but repaired, Betsy Olson 1950, Chukoh Maru 1953, scrapped 1960 |