X0306 4 2021-04-13 true 0001484612 Outset Medical, Inc. OM 0001162870 WARBURG PINCUS LLC C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 true Common Stock 2021-04-13 4 S 0 120612 50.825 D 26086 I See footnotes Common Stock 2021-04-13 4 S 0 3770111 50.825 D 815394 I See footnotes These securities are held directly by Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"). These securities are held directly by WP X Finance, L.P., a Delaware limited partnership ("WP X Finance", and together with WP X Partners, the "WPP Funds"). WPX GP, L.P., a Delaware limited partnership ("WPX GP"), is the managing general partner of WP X Finance. Warburg Pincus Private Equity X, L.P., a Delaware limited partnership ("WP X"), is the general partner of WPX GP. Warburg Pincus X, L.P., a Delaware limited partnership ("WP X LP"), is the general partner of WP X and WP X Partners. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP"), is the general partner of WP X LP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of WP X GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is the managing member of WPP GP. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners. Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of the WPP Funds. Due to the limitations of the SEC EDGAR filing system, the WPP Funds, WPX GP, WP X, WP X LP, WP X GP, WPP GP, WP Partners, WP Partners GP, and WP are filing a separate Form 4 from WP LLC. WARBURG PINCUS LLC By: /s/ Harsha Marti Name: Harsha Marti Title: General Counsel and Managing Director 2021-04-15