Prince resigned in November after the full extent of Citigroup''s sub-prime mortgage losses began to emerge.

Citigroup shares fell 3.9% to $27.90 in early morning trade Tuesday. Over the year, the have dropped 47% and more than 30% since the end of October.

Over the past 52 weeks, Citigroup shares have traded in the range $26.50 to $55.55. Analysts are now targeting a one-year price of $37.71.

Financial Industry subprime mortgage market related losses so far:

- Citigroup: $18bn
- UBS: $13.5bn
- Morgan Stanley $9.4bn
- Merrill Lynch: $8bn
- HSBC: $3.4bn
- Bear Stearns: $3.2bn
- Deutsche Bank: $3.2bn
- Bank of America: $3bn
- Barclays: $2.6bn
- Royal Bank of Scotland: $2.6bn
- Freddie Mac: $2bn
- Credit Suisse: $1bn
- Wachovia: $1.1bn
- IKB: $2.6bn
- Paribas: $439m

Source: BBC