X0306 4 2017-07-13 1 0001594864 Juno Therapeutics, Inc. JUNO 0001281933 BRATTON DOUGLAS K 201 MAIN STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 0 0001626596 Crestline Investors, Inc. 201 MAIN STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 0 0001626597 Crestline SI (GP), L.P. 201 MAIN STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 0 0001536054 Crestline Management, LP 201 MAIN STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 0 0001626595 CL Alaska, L.P. 201 MAIN STREET, SUITE 1900 FORT WORTH TX 76102 0 0 1 0 Common Stock 2017-07-13 4 S 0 8000000 27.00 D 9166130 I By CL Alaska, L.P. Common Stock 182669 I By JT Line Partners LP The purchase reported in Column 4 occurred in a block transaction at a price of $27.00 per share. These 9,166,130 shares of the Issuer are held directly by CL Alaska, L.P. ("CLA"). The general partner of CLA is Crestline SI (GP), L.P. ("Crestline SI") and the investment manager of CLA is Crestline Management, L.P. ("Crestline Management"). Crestline Investors, Inc. ("Crestline") is the general partner of both Crestline SI and Crestline Management. Douglas K. Bratton is the sole director of Crestline. CLA is ultimately controlled by Mr. Bratton and Mr. Bratton has voting and investment power over all of these shares of the Issuer as well as a partial pecuniary interest in the shares held by CLA. Mr. Bratton does not intend to sell additional shares of the Issuer from CLA at this time, however, please see the related disclosures in Item 4 of the Schedule 13D/A filed on June 25, 2015. (Continued from footnote 2) CLA may be deemed to directly beneficially own all of these shares of the Issuer. Crestline SI, Crestline Management, Crestline and Mr. Bratton may each be deemed to indirectly beneficially own all of these shares of the Issuer. Each such entity and Mr. Bratton disclaims beneficial ownership of these shares, except to the extent of its or his respective pecuniary interest therein. The shares of the Issuer reported in Column 5 are held directly by JT Line Partners LP ("JT"). The general partner of JT is Bratton Capital Management L.P. ("Bratton Capital Management"). The general partner of Bratton Capital Management is Bratton Capital, Inc. ("Bratton Capital"). Douglas K. Bratton is the sole director of Bratton Capital. JT is ultimately controlled by Mr. Bratton and Mr. Bratton has voting and investment power over all of the shares of the Issuer held by JT, as well as a partial pecuniary interest in such shares. JT directly beneficially owns these shares of the Issuer. Bratton Capital Management, Bratton Capital and Mr. Bratton may each be deemed to indirectly beneficially own the shares of the Issuer held by JT. Each such entity and Mr. Bratton disclaims beneficial ownership of these shares, except to the extent of its or his respective pecuniary interest therein. /s/ Douglas K. Bratton 2017-07-17 /s/ John S. Cochran, Vice President of Crestline Investors, Inc. 2017-07-17 /s/ John S. Cochran, Vice President of Crestline Investors, Inc., general partner of Crestline SI (GP), L.P. 2017-07-17 /s/ John S. Cochran, Vice President of Crestline Investors, Inc., general partner of Crestline Management, L.P. 2017-07-17 /s/ John S. Cochran, Vice President of Crestline Investors, Inc., general partner of Crestline SI (GP), L.P., general partner of CL Alaska, L.P. 2017-07-17