X0206 3 2015-06-24 0 0001192448 GLAUKOS Corp GKOS 0001255151 MADERA PAUL S C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE, SUITE 125 PALO ALTO CA 94301 1 0 1 0 Series E Convertible Preferred Stock Common Stock 1862784 I Through Meritech Capital Partners III L.P. Series E Convertible Preferred Stock Common Stock 33951 I Through Meritech Capital Affiliates III, L.P. Series F Convertible Preferred Stock Common Stock 1109717 I Through Meritech Capital Partners III L.P. Series F Convertible Preferred Stock Common Stock 20226 I Through Meritech Capital Affiliates III, L.P. The shares of Series E Convertible Preferred Stock and Series F Convertible Preferred Stock shall automatically convert into shares of common stock on a 1:1 basis immediately prior to the consummation of the Issuer's initial public offering ("IPO") and have no expiration date. Meritech Capital Associates III L.L.C., a Delaware limited liability company ("MCA III"), serves as the sole general partner of Meritech Capital Partners III L.P., a Delaware limited partnership ("MCP III") and of Meritech Capital Affiliates III, L.P., a Delaware limited partnership ("MCAFF III"). Meritech Management Associates III L.L.C., a Delaware limited liability company ("MMA III") is a managing member of MCA III. Paul S. Madera is a managing member of MMA III and shares voting and dispositive power over the shares held by MCP III, MCAFF III, MCA III and MMA III; however, he disclaims beneficial ownership of the shares held by such entities except to the extent of his pecuniary interests therein. Mr. Madera intends to voluntarily resign from the Issuer's Board of Directors upon consummation of the Issuer's IPO. This report is one of two reports, each on a separate Form 3, but relating to the same transaction being filed by entities affiliated with Meritech Capital Partners and their associated managing members. /s/ Joel Backman, Attorney-in-fact for above-listed individual 2015-06-24