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Wells Fargo Cost of Savings Index (Wells Fargo COSI)

See also: Wachovia Cost of Savings Index (Wachovia COSI)

See also: GDW Cost of Savings Index (GDW COSI)

Note: Since the merger of Wachovia and World Savings the Wachovia family of companies no longer uses the original COSI index for new mortgages. The original COSI index (a.k.a. GDW COSI or World Savings COSI) has been discontinued. The final COSI value {4.79} was released in September, 2007 for the month of August 2007. Starting from August 1, 2007 Wachovia offers the new Wachovia Cost of Savings Index. Starting from December 2009 the former Wachovia COSI is called the Wells Fargo COSI.

The Wells Fargo Cost of Savings Index is a new mortgage (ARM) index available through Wells Fargo. The index is based on the interest rates the depository subsidiaries of Wells Fargo & Company pay to individuals on certificates of deposit (CDs), also known as 'personal time deposits'. The index is calculated monthly and is based on the weighted average of all the interest rates paid on certificates of deposit held by individual depositors as of the last business day of each month. The Wells Fargo COSI includes both Wells Fargo and Wachovia certificates of deposit.

As personal time deposit rates tend to move more slowly than market interest rates in general, and because the W-COSI is composed of a portfolio of such deposits with different maturities, the Wells Fargo Cost of Savings Index lags when market rates move up or down. Since the W-COSI is more steady than the other popular indexes more closely tied to market interest rates, ARMs tied to this index are good for you if rates are rising (but not good if they are falling).

Wells Fargo Cost of Savings Index History

Month COSI
2005 ~ Jan 2.81
2005 ~ Feb 2.87
2005 ~ Mar 2.95
2005 ~ Apr 3.03
2005 ~ May 3.10
2005 ~ Jun 3.15
2005 ~ Jul 3.25
2005 ~ Aug 3.34
2005 ~ Sep 3.43
2005 ~ Oct 3.49
2005 ~ Nov 3.56
2005 ~ Dec 3.64
2006 ~ Jan 3.74
2006 ~ Feb 3.82
2006 ~ Mar 3.91
2006 ~ Apr 4.01
2006 ~ May 4.13
2006 ~ Jun 4.24
2006 ~ Jul 4.38
2006 ~ Aug 4.54
2006 ~ Sep 4.65
2006 ~ Oct 4.74
2006 ~ Nov 4.80
2006 ~ Dec 4.85
2007 ~ Jan 4.88
2007 ~ Feb 4.91
2007 ~ Mar 4.92
2007 ~ Apr 4.94
2007 ~ May 4.91
2007 ~ Jun 4.90
2007 ~ Jul 4.90
2007 ~ Aug 4.85
2007 ~ Sep 4.88
2007 ~ Oct 4.90
2007 ~ Nov 4.85
2007 ~ Dec 4.79
2008 ~ Jan 4.74
2008 ~ Feb 4.65
2008 ~ Mar 4.43
2008 ~ Apr 4.19
2008 ~ May 3.91
2008 ~ Jun 3.74
Month COSI
2008 ~ Jul 3.77
2008 ~ Aug 3.73
2008 ~ Sep 3.74
2008 ~ Oct 3.76
2008 ~ Nov 3.78
2008 ~ Dec 3.76
2009 ~ Jan 3.69
2009 ~ Feb 3.60
2009 ~ Mar 3.60
2009 ~ Apr 3.55
2009 ~ May 3.51
2009 ~ Jun 3.43
2009 ~ Jul 3.22
2009 ~ Aug 3.12
2009 ~ Sep 2.94
2009 ~ Oct 2.81
2009 ~ Nov 2.40
2009 ~ Dec 2.35
2010 ~ Jan 2.27
2010 ~ Feb 2.25
2010 ~ Mar 2.25
2010 ~ Apr 2.25
2010 ~ May 2.24
2010 ~ Jun 2.24
2010 ~ Jul 2.23
2010 ~ Aug 2.22
2010 ~ Sep 2.20
2010 ~ Oct 2.19
2010 ~ Nov 2.20
2010 ~ Dec 2.22
2011 ~ Jan 2.21
2011 ~ Feb 2.22
2011 ~ Mar 2.23
2011 ~ Apr 2.23
2011 ~ May 2.24
2011 ~ Jun 2.21
2011 ~ Jul 2.12
2011 ~ Aug 2.09
2011 ~ Sep 2.09
2011 ~ Oct 2.09
2011 ~ Nov 2.09
2011 ~ Dec 2.07
Month COSI
2012 ~ Jan 2.06
2012 ~ Feb 2.05
2012 ~ Mar 2.01
2012 ~ Apr 1.97
2012 ~ May 1.94
2012 ~ Jun 1.91
2012 ~ Jul 1.89
2012 ~ Aug 1.89
2012 ~ Sep 1.89
2012 ~ Oct 1.89
2012 ~ Nov 1.89
2012 ~ Dec 1.88
2013 ~ Jan 1.88
2013 ~ Feb 1.88
2013 ~ Mar 1.86
2013 ~ Apr 1.82
2013 ~ May 1.70
2013 ~ Jun 1.56
2013 ~ Jul 1.44
2013 ~ Aug 1.33
2013 ~ Sep 1.16
2013 ~ Oct 1.07
2013 ~ Nov 0.99
2013 ~ Dec 0.96
2014 ~ Jan 0.94
2014 ~ Feb 0.93
2014 ~ Mar 0.91
2014 ~ Apr 0.90
2014 ~ May 0.90
2014 ~ Jun 0.90
2014 ~ Jul 0.89
2014 ~ Aug 0.89
2014 ~ Sep 0.85
2014 ~ Oct 0.85
2014 ~ Nov 0.84
2014 ~ Dec 0.84
2015 ~ Jan 0.83
2015 ~ Feb 0.78
2015 ~ Mar 0.73
2015 ~ Apr 0.69
2015 ~ May 0.65
Mortgage-X compiles historical values for the indexes which are widely used on adjustable rate mortgages (ARMs): Historical Data

Mortgage Professionals Offering COSI-indexed Loans: If you are looking for a COSI-indexed ARM and need more information or advice, we invite you to take advantage of our database of the most competitive lenders available. Just complete a short loan request form and the best lenders in your local area will contact you with their rates and fees.

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