Exhibit 99.1 Date: February 21, 2019 Form 4 List of Reporting Owners and Signature Page Name of designated filer: WARBURG PINCUS & CO. Other joint filers: Warburg Pincus Private Equity XI, L.P., WPXI Finance, LP, Warburg Pincus XI Partners, L.P., WPXI GP, L.P., Warburg Pincus XI, L.P., WP Global LLC, Warburg Pincus Partners II, L.P., Warburg Pincus Partners GP LLC, Warburg Pincus LLC, Charles R. Kaye, Joseph P. Landy Address for each joint filer is: c/o Warburg Pincus & Co., 450 Lexington Avenue, New York, New York 10017 Issuer Name and Ticker or Trading Symbol: Avalara, Inc. (AVLR) WARBURG PINCUS PRIVATE EQUITY XI, L.P. BY: WARBURG PINCUS XI, L.P., ITS GENERAL PARTNER BY: WP GLOBAL LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WPXI FINANCE, LP BY: WPXI GP, L.P., ITS MANAGING GENERAL PARTNER BY: WARBURG PINCUS PRIVATE EQUITY XI, L.P., ITS GENERAL PARTNER BY: WARBURG PINCUS XI, L.P., ITS GENERAL PARTNER BY: WP GLOBAL LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WARBURG PINCUS XI PARTNERS, L.P. BY: WARBURG PINCUS XI, L.P., ITS GENERAL PARTNER BY: WP GLOBAL LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WPXI GP, L.P. BY: WARBURG PINCUS PRIVATE EQUITY XI, L.P., ITS GENERAL PARTNER BY: WARBURG PINCUS XI, L.P., ITS GENERAL PARTNER BY: WP GLOBAL LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WARBURG PINCUS XI, L.P. BY: WP GLOBAL LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WP GLOBAL LLC BY: WARBURG PINCUS PARTNERS II, L.P., ITS MANAGING MEMBER BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WARBURG PINCUS PARTNERS II, L.P. BY: WARBURG PINCUS PARTNERS GP LLC, ITS GENERAL PARTNER BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WARBURG PINCUS PARTNERS GP LLC BY: WARBURG PINCUS & CO., ITS MANAGING MEMBER /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Partner WARBURG PINCUS LLC /s/ ROBERT B. KNAUSS --------------------------------- By: Robert B. Knauss Title: Managing Director CHARLES R. KAYE /s/ ROBERT B. KNAUSS --------------------------------- Name: Charles R. Kaye By: Robert B. Knauss, Attorney-in-Fact JOSEPH P. LANDY /s/ ROBERT B. KNAUSS --------------------------------- Name: Joseph P. Landy By: Robert B. Knauss, Attorney-in-Fact
WPXI Finance
Filed: 21 Feb 19, 4:37pm