CytomX Therapeutics Inc. Watch

from S-3 52 pages CytomX Therapeutics, Inc. Indenture Dated as of [___], 20[__] [___] Trustee

from 8-K 14 pages CytomX Therapeutics, Inc. Warrant to Purchase Common Stock or Pre-Funded Warrants

from 8-K 12 pages CytomX Therapeutics, Inc. Pre-Funded Warrant to Purchase Common Stock

from S-3 51 pages CytomX Therapeutics, Inc. Indenture Dated as of , 20 [ ] Trustee

from 10-Q 5 pages Description of Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 5 pages Description of Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from S-3 51 pages CytomX Therapeutics, Inc. Indenture Dated as of , 20 [ ] Trustee

from 10-Q 22 pages Registration Rights Agreement

from S-3 51 pages CytomX Therapeutics, Inc. Indenture Dated as of , 20 [ ] Trustee

from S-1/A 2 pages Zq|cert#|coy|cls|rgstry|acct#|transtype|run#|trans# Common Stock Par Value $0.00001 Common Stock This Certificate Is Transferable in Canton, Ma, Jersey City, Nj and College Station, Tx Certificate Number Zq00000000 Shares ** 000000 ************ ****** ***000000***************** ****000000**************** *****000000*************** ******000000 ************** CytomX Therapeutics, Inc. Incorporated Under the Laws of the State of Delaware This Certifies That Mr. Sample & Mrs. Sample & Mr. Sample & Mrs. Sample Cusip 23284f 10 5 See Reverse for Certain Definitions Is the Owner of ***Zero Hundred Thousand Zero Hundred and Zero*** Fully-Paid and Non-Assessable Shares of Common Stock of CytomX Therapeutics, Inc. (Hereinafter Called the “Company”), Transferable on the Books of the Company in Person or by Duly Authorized Attorney, Upon Surrender of This Certificate Properly Endorsed. This Certificate and the Shares Represented Hereby, Are Issued and Shall Be Held Subject to All of the Provisions of the Certificate of Incorporation, as Amended, and the By-Laws, as Amended, of the Company (Copies of Which Are on File With the Company and With the Transfer Agent), to All of Which Each Holder, by Acceptance Hereof, Assents. This Certificate Is Not Valid Unless Countersigned and Registered by the Transfer Agent and Registrar. Witness the Facsimile Seal of the Company and the Facsimile Signatures of Its Duly Authorized Officers. Facsimile Signature to Come President Dated Dd-MMM-Yyyy Countersigned and Registered: Computershare Trust Company, N.A. Transfer Agent and Registrar, Facsimile Signature to Come Secretary by Authorized Signature 1234567 Po Box 43004, Providence, Ri 02940-3004 Mr a Sample Designation (If Any) Add 1 Add 2 Add 3 Add 4 Cusip Xxxxxx XX X Holder Id Xxxxxxxxxx Insurance Value 1,000,000.00 Number of Shares 123456 Dtc 12345678 123456789012345

from S-1 11 pages Warrant to Purchase Preferred Stock

from S-1 76 pages Amended and Restated Investors’ Rights Agreement

from DRS 11 pages Warrant to Purchase Preferred Stock

from DRS 76 pages Amended and Restated Investors’ Rights Agreement