X0202 4 2006-03-13 1 0001344413 Alexza Pharmaceuticals Inc. ALXA 0001328093 FHM III, LLC 601 UNION STREET SUITE 3200 SEATTLE WA 98101 0 0 0 1 Former 10% Owner 0001328279 Frazier Healthcare III, LP 601 UNION STREET SUITE 3200 SEATTLE WA 98101 0 0 0 1 Former 10% Owner 0001328291 Frazier Affiliates III, LP 601 UNION STREET SUITE 3200 SEATTLE WA 98101 0 0 0 1 Former 10% Owner 0001140366 FRAZIER HEALTHCARE IV LP 0 0 0 1 Former 10% Owner 0001161015 FRAZIER AFFILIATES IV LP 0 0 0 1 Former 10% Owner 0001281153 FHM IV LP TWO UNION SQUARE 601 UNION STREET STE 3200 SEATTLE WA 98101 0 0 0 1 Former 10% Owner Common Stock 2006-03-13 4 C 0 4390 A 4390 I By Frazier Affiliates III, L.P. Common Stock 2006-03-13 4 C 0 8054 A 8054 I By Frazier Affiliates IV, L.P. Common Stock 2006-03-13 4 C 0 583931 A 583931 I By Frazier Healthcare III, L.P. Common Stock 2006-03-13 4 C 0 1586752 A 1586752 I By Frazier Healthcare IV, L.P. Series C Preferred Stock 2006-03-13 4 C 0 19155 0 D Common Stock 3863 0 I By Frazier Affiliates III, L.P. Series C Preferred Stock 2006-03-13 4 C 0 27542 0 D Common Stock 5555 0 I By Frazier Affiliates IV, L.P. Series C Preferred Stock 2006-03-13 4 C 0 2547068 0 D Common Stock 513768 0 I By Frazier Healthcare III, L.P. Series C Preferred Stock 2006-03-13 4 C 0 5425681 0 D Common Stock 1094412 0 I By Frazier Healthcare IV, L.P. Series D Preferred Stock 2006-03-13 4 C 0 2902 0 D Common Stock 527 0 I By Frazier Affiliates III, L.P. Series D Preferred Stock 2006-03-13 4 C 0 13746 0 D Common Stock 2499 0 I By Frazier Affiliates IV, L.P. Series D Preferred Stock 2006-03-13 4 C 0 385900 0 D Common Stock 70163 0 I By Frazier Healthcare III, L.P. Series D Preferred Stock 2006-03-13 4 C 0 2707872 0 D Common Stock 492340 0 I By Frazier Healthcare IV, L.P. The Issuer's preferred stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering. The number of shares does not reflect the automatic conversion of each share of Series C Preferred Stock into 0.202 shares of Common Stock upon the closing of the initial public offering and had no expiration date. The Issuer's preferred stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering. The number of shares does not reflect the automatic conversion of each share of Series D Preferred Stock into 0.182 shares of Common Stock upon the closing of the initial public offering and had no expiration date. These securities are owned directly by the entity listed. Frazier Affiliates III, LP and Frazier Healthcare III, LP are joint filers. The designated filer, FHM III, LLC, serves as the general partner of Frazier Affiliates III, LP and Frazier Healthcare III, LP. FHM III, LLC disclaims beneficial ownership of the reported securities, except to the extent of its proportionate pecuniary interest therein. These securities are owned directly by the entity listed. Frazier Affiliates IV, LP and Frazier Healthcare IV, LP are joint filers. FHM IV, LP, also a joint filer, serves as the general partner of Frazier Affiliates IV, LP and Frazier Healthcare IV, LP. FHM IV, LP disclaims beneficial ownership of the reported securities, except to the extent of its proportionate pecuniary interest therein. Exhibit 99 - Joint Filer Information FHM III, LLC By: Frazier & Company, Its Managing Member By: /s/ Alan D. Frazier, President 2006-03-13