Shares in Silvergate jumped after the disclosure, and were last up about 14%.
Silvergate has been seeking to ease investor concerns over
its future, after reporting a $1 billion loss for the fourth
quarter because crypto exchange FTX's bankruptcy shook
confidence in the digital asset sector.
Federal prosecutors in Washington are probing Silvergate
and its dealings with FTX and Alameda Research, according to a
source familiar with the investigation.
U.S. custodian bank State Street Corp reported a
9.32% passive stake in Silvergate earlier this month.
(Reporting by Hannah Lang in Washington; Editing by Leslie
Adler)