The satellite-tracked fish, named Lydia, was recently observed crossing the mid-Atlantic ridge, which is roughly the midway point between North America and Europe.
“No white sharks have crossed from west to east or east to west,” said Dr. Gregory Skomal, senior fisheries biologist with Massachusetts Marine Fisheries.
Lydia has zigzagged approximately 20,000 miles across the western Atlantic since being tagged last March.
One scientist monitoring her movements with the Ocearch project speculates that the fish is pregnant.
“If I had to guess, I would guess that Lydia … has been out in the open ocean, gestating her babies and that this spring she will lead us to where those baby white sharks are born —- the nursery,” Chris Fischer told the BBC.
The Ocearch project has now tagged nearly 150 sharks, including mako, hammerhead, tiger sharks and other species.
One tagged mako shark, named Rizzilient, appears to have been caught by fishermen and was last located on land in northern Portugal.
Researchers warn that many shark species are threatened due to overfishing and mutilation for their prized fins.