It wasn't clear whether Jett had been the mastermind behind this accounting glitch or if more senior management had been aware of the false profits, but these two facts were clear: (1) Kidder's accounting system had failed to disclose $350 million of losses from Strips trading, and (2) Jett, before he was fired, had been Kidder's head of Strips trading. It also appeared that some of the $350 million in losses had migrated to First Boston, where it accounted for at least a portion of the $50 million of Strips trading profits.
Source, FIASCO: Blood In the Water on Wall Street by Frank Partnoy
Context, Jett worked at Kidder and made kidder lose $350 million.
How can I interpret "migrated" here? What does it mean for the loss to migrate to First Boston?
1: to move from one country or place to live or work in another
2: of a bird or animal : to move from one area to another at different times of the year