Karczewski has been with Citi since October 2010, joining as managing director and head of equity finance sales for Europe, the Middle East and Africa, and becoming managing director of strategic risk solutions in April 2015. She was also co-chair of Citi Women.
Before this, she spent time at Deutsche Bank and Morgan Stanley.
Karczewski currently sits on the board of directors of the London Women’s Forum, and has previously held the chair position.
In her new role, starting in January, she will report to John Van Verre, global head of custody at HSBC.
Citi and HSBC each confirmed the move, but both declined to comment further.