X0306 4 2013-10-28 0 0001484504 Gigamon Inc. GIMO 0001554026 Highland Management Partners VII, LLC C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001343678 Highland Capital Partners VII LP C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001343244 HIGHLAND CAPITAL PARTNERS VII-B L P C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001343673 Highland Capital Partners VII-C LP C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001357840 Highland Entrepreneurs Fund VII Limited Partnership C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 0001554027 Highland Management Partners VII Limited Partnership C/O HIGHLAND CAPITAL PARTNERS, ONE BROADWAY, 16TH FLOOR CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2013-10-28 4 S 0 1131444 38.50 D 3550158 I See Footnote Common Stock 2013-10-28 4 S 0 274171 38.50 D 860272 I See Footnote Common Stock 2013-10-28 4 S 0 399279 38.50 D 1252828 I See Footnote Common Stock 2013-10-28 4 S 0 35453 38.50 D 111242 I See Footnote The securities are held by Highland Capital Partners VII Limited Partnership ("HCP VII"). Highland Management Partners VII, LLC ("HMP VII LLC") is the general partner of Highland Management Partnership VII Limited Partnership ("HMP VII LP"), which is the general partner of HCP VII. Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII except to the extent, if any, of such entity's pecuniary interest therein. The securities are held by Highland Capital Partners VII-B Limited Partnership ("HCP VII-B"). HMP VII LP is the general partner of HCP VII-B. Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII-B except to the extent, if any, of such entity's pecuniary interest therein. The securities are held by Highland Capital Partners VII-C Limited Partnership ("HCP VII-C"). HMP VII LP is the general partner of HCP VII-C. Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII-C except to the extent, if any, of such entity's pecuniary interest therein. The securities are held by Highland Entrepreneurs' Fund VII Limited Partnership ("HEF VII"). HMP VII LP is the general partner of HEF VII. Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HEF VII except to the extent, if any, of such entity's pecuniary interest therein. /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC 2013-10-28 /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership 2013-10-28 /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII Limited Partnership 2013-10-28 /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII-B Limited Partnership 2013-10-28 /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII-C Limited Partnership 2013-10-28 /s/ Corey Mulloy, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Entrepreneurs' Fund VII Limited Partnership 2013-10-28