SLM Corporation
Medium Term Notes, Series B

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With Maturities of 9 Months or More from Date of Issue

Registration No. 333-90316
Filed Pursuant to Rule 424(b)(3)
Pricing Supplement No. 159
(To Prospectus dated January 23, 2003 and
Prospectus Supplement dated January 23, 2003)
  Trade Date: 10/14/03
Issue Date: 10/17/03
   

The date of this Pricing Supplement is 10/14/03

 
   
   
   
   
 
Interest Payment

   
 
Subject to Redemption

   
   
   
CUSIP
  Stated Interest Rate Per Annum(1)
  Maturity Date
  Price to Public(2)(3)
  Discounts & Commissions
  Frequency
  First Payment
  Survivor's Option
  Yes/No
  Date and terms of redemption
  Aggregate Principal Amount
  Net Proceeds
  OID Status
78490FGR4   FLOAT   3/15/09   100 % 0.750 % Quarterly(4 ) 12/15/03   Yes   No       723,000   717,577.50   N

Floating Rate Index

 

Spread


 

Reset
Period(4)


 

Accrual Method


 

Maximum Interest Rate


 

Minimum Interest Rate


 

 

91 Day T-Bill   0.600 % Weekly   Actual/Actual (Payment Basis)   N/A   N/A    




Effective April 7, 2003 the name of Salomon Smith Barney Inc., an agent of the program, was changed to Citigroup Global Markets Inc.

(1)
The interest rates on the Ed Notes may be changed by SLM Corporation from time to time, but any such change will not affect the interest rate on any Ed Notes offered prior to the effective date of the change.

(2)
Expressed as a percentage of aggregate principal amount.

(3)
See "Supplemental Plan of Distribution" in the Prospectus supplement for additional information concerning price to public and underwriting compensation.

(4)
On the Interest Reset Date, which is the day after the 3 month T Bill auction, the Calculation Agent will establish the new rate based on the BEY for the 3 month T Bill auction published in H.15 (http://www.publicdebt.treas.gov/of/ofrespr.htm).
In the event that the results of the 91 day Treasury Bill auction ceases to be published or reported, or that no auction is held in a particular week, then the rate in effect as a result of the last such report will remain in effect until such time, as the results of auctions of 91 day Treasury Bills will again be published.