X0306 4 2016-01-22 0 0001484504 Gigamon Inc. GIMO 0001578831 Ho Ted C C/O GIGAMON INC. 3300 OLCOTT STREET SANTA CLARA CA 95054 1 0 0 0 Common Stock 2016-01-22 4 S 0 10000 23.1333 D 550919 I See footnote Common Stock 2016-01-22 4 S 0 10000 23.1293 D 550919 I See footnote The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 23, 2015. The sale price for this transaction in column 4 of Table I represents the weighted average sale price of the shares sold, ranging from $22.75 to $23.47 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. Shares are held by The Ted Ching-Lin Ho Nevada Gift Trust under which the Reporting Person may receive discretionary distributions during his lifetime. The sale price for this transaction in column 4 of Table I represents the weighted average sale price of the shares sold, ranging from $22.75 to $23.48 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. Shares are held by The Julie Hsiao Ling Ho Nevada Gift Trust under which the Reporting Person may receive discretionary distributions during his lifetime. /s/ Paul Shinn, Attorney-in-Fact 2016-01-25