Offer To Purchase For Cash
All Outstanding Shares of Common Stock
of
KITE PHARMA, INC.
a Delaware corporation
at
$180.00 NET PER SHARE
Pursuant to the Offer to Purchase dated September 5, 2017
by
DODGERS MERGER SUB, INC.
a wholly-owned subsidiary of
GILEAD SCIENCES, INC.

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT ONE MINUTE AFTER
11:59 P.M., EASTERN TIME, ON OCTOBER 2, 2017,
UNLESS THE OFFER IS EXTENDED OR EARLIER TERMINATED.

We have been engaged by Dodgers Merger Sub, Inc., a Delaware corporation (which we refer to as "Purchaser") and a wholly-owned subsidiary of Gilead Sciences, Inc., a Delaware corporation (which we refer to as "Parent"), to act as Information Agent in connection with Purchaser's offer to purchase, subject to certain conditions, including the satisfaction of the Minimum Tender Condition, as defined in the Offer to Purchase, any and all of the outstanding shares of common stock, par value $0.001 per share (which we refer to as the "Shares"), of Kite Pharma, Inc., a Delaware corporation (which we refer to as "Kite"), at a price of $180.00 per Share, net to the holder in cash, without interest (the "Offer Price"), subject to any required withholding of taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated September 5, 2017 (which we refer to as the "Offer to Purchase"), and the related Letter of Transmittal (which we refer to as the "Letter of Transmittal" and which, together with the Offer to Purchase, each as may be amended or supplemented from time to time, constitutes, and we refer to as, the "Offer") enclosed herewith. Please furnish copies of the enclosed materials to those of your clients for whom you hold Shares registered in your name or in the name of your nominee.

The Offer is not subject to any financing condition. The conditions to the Offer are described in Section 13 of the Offer to Purchase.

For your information and for forwarding to your clients for whom you hold Shares registered in your name or in the name of your nominee, we are enclosing the following documents:

We urge you to contact your clients as promptly as possible. Please note that the Offer and withdrawal rights will expire at one minute after 11:59 p.m., Eastern Time, on October 2, 2017, unless the Offer is extended or earlier terminated.

The Offer is being made in connection with the Agreement and Plan of Merger, dated as of August 27, 2017 (together with any amendments or supplements thereto, the "Merger Agreement"), among Kite, Parent and Purchaser, pursuant to which, after the completion of the Offer and the satisfaction or waiver of certain conditions, Purchaser will be merged with and into Kite, without a meeting of the Kite stockholders in accordance with Section 251(h) of the General Corporation Law of the State of Delaware (the "DGCL"), and Kite will be the surviving corporation and a direct wholly-owned subsidiary of Parent (such merger, the "Merger"). At the effective time of the Merger, all then outstanding Shares (other than (i) Shares held by Kite (or held in Kite's treasury), (ii) Shares held by Parent, or any other direct or indirect wholly-owned subsidiary of Parent and (iii) Shares held by stockholders who have properly exercised and not effectively withdrawn their respective demand or otherwise lost their respective rights to appraisal pursuant to Section 262 of the DGCL) will be converted into the right to receive consideration equal to the Offer Price, without interest, less any applicable withholding taxes.

For Shares to be properly tendered pursuant to the Offer, (a) the share certificates or confirmation of receipt of such Shares under the procedure for book-entry transfer, together with a properly completed and duly executed Letter of Transmittal, including any required signature guarantees, or, in the case of book-entry transfer, either such Letter of Transmittal or an Agent's Message (as defined in Section 3 of the Offer to Purchase) in lieu of such Letter of Transmittal, and any other documents required in the Letter of Transmittal, must be timely received by the Depositary, or (b) the tendering stockholder must comply with the guaranteed delivery procedures, all in accordance with the Offer to Purchase and the Letter of Transmittal. You may gain some additional time by making use of the Notice of Guaranteed Delivery. Shares tendered by the Notice of Guaranteed Delivery will be excluded from the calculation of the Minimum Tender Condition, unless such Shares and other required documents are received by the Depositary by the Expiration Date (as defined in Section 1 of the Offer to Purchase).

Except as set forth in the Offer to Purchase, Purchaser will not pay any fees or commissions to any broker or dealer or other person, other than to us, as the information agent, and Computershare Trust Company, N.A., as the depositary, for soliciting tenders of Shares pursuant to the Offer. Purchaser will, however, upon request, reimburse brokers, dealers, commercial banks, trust companies and other nominees for customary mailing and handling expenses incurred by them in forwarding the offering material to their customers. Purchaser will pay all stock transfer taxes applicable to its purchase of Shares pursuant to the Offer, subject to Instruction 6 of the Letter of Transmittal.

Any inquiries you may have with respect to the Offer should be addressed to, and additional copies of the enclosed materials may be obtained from, the undersigned at the address and telephone numbers set forth below.

Nothing contained herein or in the enclosed documents shall render you the agent of Parent, Purchaser, the Information Agent or the Depositary or any affiliate of any of them or authorize you or any other person to use any document or make any statement on behalf of any of them in connection with the Offer other than the enclosed documents and the statements contained therein.

The Information Agent for the Offer is:

Innisfree M&A Incorporated
501 Madison Avenue, 20th Floor
New York, NY 10022

Banks and Brokerage Firms Call: (212) 750-5833
Stockholders Call Toll Free: (888) 750-5834