X0306 4 2015-06-30 0 0001192448 GLAUKOS Corp GKOS 0001500544 Meritech Capital Associates III L.L.C. C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 0001336460 Meritech Capital Partners III LP C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 0001359256 MERITECH CAPITAL AFFILIATES III L P C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 0001255152 GORDON MICHAEL B C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 0001501075 Ward Rob C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 0001500543 Bischof George C/O MERITECH CAPITAL PARTNERS 245 LYTTON AVE., SUITE 125 PALO ALTO CA 94301 0 0 1 0 Common Stock 2015-06-30 4 C 0 2972501 A 2972501 I Through Meritech Capital Partners III L.P. Common Stock 2015-06-30 4 C 0 54177 A 54177 I Through Meritech Capital Affiliates III, L.P. Series E Convertible Preferred Stock 2015-06-30 4 C 0 1862784 0 D Common Stock 1862784 0 I Through Meritech Capital Partners III L.P. Series E Convertible Preferred Stock 2015-06-30 4 C 0 33951 0 D Common Stock 33951 0 I Through Meritech Capital Affiliates III, L.P. Series F Convertible Preferred Stock 2015-06-30 4 C 0 1109717 0 D Common Stock 1109717 0 I Through Meritech Capital Partners III L.P. Series F Convertible Preferred Stock 2015-06-30 4 C 0 20226 0 D Common Stock 20226 0 I Through Meritech Capital Affiliates III, L.P. The shares of Series E Convertible Preferred Stock and Series F Convertible Preferred Stock automatically converted into shares of common stock on a 1:1 basis immediately prior to the consummation of Issuer's initial public offering and had 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, Michael B. Gordon, Robert D. Ward and George H. Bischof are the managing members of MMA III and share voting and dispositive power over the shares held by MCP III, MCAFF III, MCA III and MMA III; however, they disclaim beneficial ownership of the shares held by such entities except to the extent of their pecuniary interests therein. Paul S. Madera was a director of the Issuer, and, accordingly, files separate Section 16 reports. This report is one of two reports, each on a separate Form 4, 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 entities (or individuals) 2015-06-30