Redmile Group, LLC bought ATTO

Footnotes

On August 6, 2026, the Series B Preferred Stock converted by its terms in full automatically into shares of the Issuer's common stock, upon the consummation of the Issuer's initial public offering ("IPO"), for no consideration. The Series B Preferred Stock had no expiration date.; These securities are held directly by Redmile Biopharma Investments III, L.P. ("RBI III"), which is managed by Redmile Group, LLC ("Redmile"). RBI III disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, if any. This report shall not be deemed an admission that RBI III is the beneficial owner of the reported securities for purposes of Section 16 of the Exchange Act, or for any other purpose.; Redmile may be deemed to beneficially own the reported securities as the investment manager of RBI III and the other Redmile Clients. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. Redmile and Mr. Green disclaim beneficial ownership of the reported securities except to the extent of its and his respective pecuniary interest therein, if any. This report shall not be deemed an admission that Redmile or Mr. Green is the beneficial owner of the securities for purposes of Section 16 of the Exchange Act, or for any other purpose.