The board of directors of Citigroup Inc. (C) will meet today to look at beleaguered banking giant’s options after its shares hit a 15-year low, and speculation is escalating that it will have to look at a break-up, spin-off or sale of at least part of the bank.

Embattled U.S. banking giant Citigroup Inc. (C) has agreed to buy back $17.4 billion of assets remaining in a series of funds known as structured investment vehicles, or SIVs, after it previously agreed to guarantee the liabilities in those funds.