X0306 4 2017-03-06 0001011006 YAHOO INC YHOO 0001550608 MAYER MARISSA A C/O YAHOO! INC. 701 FIRST AVENUE SUNNYVALE CA 94089 1 1 Chief Executive Officer Common Stock 2017-03-06 4 A 0 8837 0 A 2194860 D Common Stock 2017-03-06 4 A 0 7826 0 A 2202686 D Common Stock 2017-03-06 4 A 0 10011 0 A 2212697 D Common Stock 2017-03-06 4 F 0 31739 45.64 D 2180958 D Common Stock 2017-03-06 4 F 0 2003 45.64 D 2178955 D Common Stock 2017-03-06 4 F 0 28108 45.64 D 2150847 D Common Stock 2017-03-06 4 F 0 35954 45.64 D 2114893 D Common Stock 2017-03-07 4 F 0 2561 45.73 D 2112332 D Employee Stock Option (Right to Buy) 18.87 2019-11-29 Common Stock 2503608 2503608 D On February 27, 2014, the reporting person was granted a performance-based restricted stock unit award by Yahoo! Inc. (the "Company"), a portion (or "tranche") of which was eligible to vest based on certain financial objectives for performance year 2016. The "target" number of shares subject to the award was previously reported in Table I of Form 4. On March 6, 2017, the Company determined that, based on the Company's 2016 performance, the award tranche allocated to 2016 vested at 117 percent of target. The incremental above-target vesting amount for 2016 performance is reported above. On March 6, 2015, the reporting person was granted a performance-based restricted stock unit award by the Company, a tranche of which was eligible to vest based on certain financial objectives for performance year 2016. The "target" number of shares subject to the award was previously reported in Table I of Form 4. On March 6, 2017, the Company determined that, based on the Company's 2016 performance, the award tranche allocated to 2016 vested at 117 percent of target. The incremental above-target vesting amount for 2016 performance is reported above. On March 7, 2016, the reporting person was granted a performance-based restricted stock unit award by the Company, a tranche of which was eligible to vest based on certain financial objectives for performance year 2016. The "target" number of shares subject to the award was previously reported in Table I of Form 4. On March 6, 2017, the Company determined that, based on the Company's 2016 performance, the award tranche allocated to 2016 vested at 117 percent of target. The incremental above-target vesting amount for 2016 performance is reported above. Represents shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of 60,825 restricted stock units granted to the reporting person on February 27, 2014. Represents shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of 3,837 restricted stock units granted to the reporting person on March 6, 2015. Represents shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of 53,866 restricted stock units granted to the reporting person on March 6, 2015. Represents shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of 68,903 restricted stock units granted to the reporting person on March 7, 2016. Represents shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of 4,908 restricted stock units granted to the reporting person on March 7, 2016. On November 29, 2012, the reporting person was granted a performance-based stock option by the Company, a tranche of which was eligible to vest based on certain financial objectives for performance year 2016. The "target" number of shares subject to the option was previously reported in Table II of Form 4. On March 6, 2017, the Company determined that, based on the Company's 2016 performance, the option tranche allocated to 2016 vested at 100 percent of target, thereby causing an incremental 761,538 options to become exercisable. As of March 6, 2017, a total of 2,962,379 options from this grant have vested and, net of prior exercises, 2,503,608 options remain outstanding and exercisable. No further options are eligible to vest from this grant. /s/ Marissa A. Mayer 2017-03-08