UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.          )

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Filed by a Party other than the Registrant ☐

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☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

KURA ONCOLOGY, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Kura Oncology P.O. BOX 8016, CARY, NC 27512-9903 Kura Oncology, Inc. Important Notice Regarding the Availability of Proxy Materials Stockholders Meeting to be held on June 22, 2021 For Stockholders as of record on April 23, 2021 This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy materials, and to obtain directions to attend meeting, go to: www.proxydocs.com/KURA To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the internet. For a convenient way to view proxy materials and VOTE go to www.proxydocs.com/KURA Have the 12 digit control number located in the shaded box above available when you access the website and follow the instructions. If you want to receive a paper or e-mail copy of the proxy material, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before June 11, 2021. To order paper materials, use one of the following methods. INTERNET www.investorelections.com/KURA TELEPHONE (866) 648-8133 * E-MAIL paper@investorelections.com When requesting via the Internet or telephone you will need the 12 digit control number located in the shaded box above. * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located above) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Kura Oncology, Inc. Meeting Type: Date: Time: Place: Annual Meeting of Stockholders Tuesday, June 22, 2021 08:30 AM, Pacific Time Annual Meeting to be held live via the Internet - please visit www.proxydocs.com/KURA for more details. You must register to attend the meeting online and/or participate at www.proxydocs.com/KURA SEE REVERSE FOR FULL AGENDA

Kura Oncology, Inc. Annual Meeting of Stockholders THE BOARD OF DIRECTORS RECOMMENDS A VOTE: "FOR" all of the nominees for director listed below and "FOR" Proposals 2 and 3 PROPOSAL 1. Election of two Class I directors for three-year terms: 1.01 Troy E. Wilson, Ph.D., J.D. 1.02 Faheem Hasnain 2. To ratify selection of Ernst & Young LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2021. 3. Approval, on an advisory basis, of the compensation of our Named Executive Officers during the year ended December 31, 2020. 4. To transact any other business as may properly come before the meeting or any adjournment or postponement thereof.