X0306 4/A 2019-02-01 2019-02-05 1 0001393612 Discover Financial Services DFS 0001183830 NELMS DAVID W 2500 LAKE COOK ROAD RIVERWOODS IL 60015 0 1 0 0 Executive Officer Common Stock 2019-02-01 4 F 0 53794 68.40 D 1078070.85 D Common Stock 2019-02-01 4 S 0 60000 67.94 D 1018070.85 D This amended Form 4 is filed to correct the number of securities reported in Table I, which were previously incorrectly reported due to administrative error. Number of shares withheld to pay the tax withholding obligation incurred in connection with the vesting of previously-granted (i) performance stock units, and (ii) restricted stock units. Sold pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person on January 29, 2018. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.45 to $68.22, inclusive. The reporting person undertakes to provide to Discover Financial Services, any security holder of Discover Financial Services, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote Reporting person retired from the Issuer on March 8, 2019 /s/ Jennifer K. Schott as Attorney-in-Fact for David W. Nelms 2019-05-07