Wells Fargo Cost of Savings Index - COSI

Formerly known as the World Savings COSI and the Wachovia COSI, the Wells Fargo Cost of Savings Index (COSI) is an ARM index, a benchmark interest rate that makes the interest rate of the adjustable-rate mortgage floats up or down.
Here are some popular ARM Indices: National Mortgage Contract Rate (NMCR), Auction Averages of Treasury Bills (T-Bill), Constant Maturity of the Treasury (CMT), Certificates of Deposit Index (CODI), Federal Cost of Funds, London Interbank Offered Rate (LIBOR), and Prime Lending Rate.

The Wells Fargo Cost of Savings Index is based on the interest rates paid, on the last day of each month, by Wells Fargo's banks on certificates of deposits that are held by individual depositors.
The COSI is reflecting the rate Wells Fargo is paying to individuals for their CD's; it is specific to Wells Fargo banking group and is calculated by taking the weighted average of the interest rates on the relevant deposits.

The COSI data usually lags one month and can be downloaded using the current object. It is available since June 2007 and it is associated with "^COSI" ticker symbol.

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