UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

(Rule 14d-100)

TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1)

OF THE SECURITIES EXCHANGE ACT OF 1934

Rain Oncology Inc.

(Name of Subject Company (Issuer))

WK Merger Sub, Inc.

a wholly-owned subsidiary of

Pathos AI, Inc.

(Names of Filing Persons (Offerors))

Common Stock, Par Value $0.001 Per Share

(Title of Class of Securities)

75082Q105

(CUSIP Number of Class of Securities)

Ryan Fukushima

Pathos AI, Inc.

600 W. Chicago Ave., Suite 510

Chicago, IL 60654

(312) 765-7820

(Name, address, and telephone numbers of person authorized to receive notices and communications on behalf of filing persons)

Copies to:

Mitchell S. Bloom, Esq.

Robert Masella, Esq.

Jean A. Lee, Esq.

Goodwin Procter LLP

100 Northern Ave

Boston, MA 02210

(617) 570-1000

Check the appropriate boxes below to designate any transactions to which the statement relates:

Check the following box if the filing is a final amendment reporting the results of the tender offer.   ☐

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

This filing relates solely to preliminary communications made before the commencement of a planned tender offer (the “Offer”) by WK Merger Sub, Inc., a Delaware corporation (“Merger Sub”), a wholly-owned subsidiary of Pathos AI, Inc., a Delaware corporation (“Parent”), for all of the outstanding common stock of Rain Oncology Inc., a Delaware corporation (the “Company”), to be commenced pursuant to the Agreement and Plan of Merger, dated as of December 13, 2023, among Parent, Merger Sub and the Company.

The press release filed herewith as Exhibit 99.1 is neither an offer to purchase nor a solicitation of an offer to sell securities. The Offer for the common stock of the Company described in this filing has not commenced. At the time the Offer is commenced, Parent will file or cause to be filed a tender offer statement on Schedule TO with the Securities and Exchange Commission (“SEC”), and the Company will file a solicitation/recommendation statement on Schedule 14D-9, with respect to the Offer.

Cautionary Note Regarding Forward-Looking Statements

This communication contains forward-looking statements related to Rain Oncology Inc. (the “Company”) and the acquisition of the Company by Pathos AI, Inc. (“Parent”), including express or implied forward-looking statements about the Company’s products and the future operations and performance of the Company and Parent. These forward-looking statements are within the meaning of U.S. federal securities laws, including, without limitation, statements regarding the anticipated timing of and closing of the proposed Offer, Merger and related transactions contemplated by the Merger Agreement (collectively referred to as the “transactions”). The words “estimates,” “expects,” “continues,” “intends,” “plans,” “anticipates,” “targets,” “may,” “will,” “would,” “could,” “should,” “potential,” “goal,” and “effort” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. These statements are based on current plans, estimates and projections. By their very nature, forward-looking statements involve inherent risks and uncertainties, both general and specific. The Company cautions that a number of important factors, including those described in this communication, could cause actual results to differ materially from those contemplated in any forward-looking statements. Any forward-looking statements in this communication are based on management’s current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this communication, including, without limitation, the impact of actions of other parties with respect to the transactions; the possibility that competing offers will be made; the outcome of any legal proceedings that have been or could be instituted against the Company or its directors; the risk that the transactions may not be completed in a timely manner, or at all, which may adversely affect the Company’s business and the price of its common stock; the failure to satisfy all of the closing conditions of the transactions contemplated by the Merger Agreement; the occurrence of the events or achievement of the milestones giving rise to payments under the CVR Agreement; the occurrence of any event, change or other circumstance that could give rise to the termination of the Merger Agreement; the effect of the announcement or pendency of the transactions on the Company’s business, and operating results; risks that the transactions may disrupt the Company’s current plans and business operations; risks related to the diverting of management’s attention from the Company’s ongoing business operations; general economic and market conditions and the other risks identified in the Company’s filings with the U.S. Securities and Exchange Commission (“SEC”), including its most recent Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on March 9, 2023 and subsequent filings with the SEC. Should any risks and uncertainties develop into actual events, these developments could have a material adverse effect on the transactions and/or the Company and the Company’s ability to successfully complete the transactions and, with respect to any CVR payment amounts, the consideration ultimately paid to Company stockholders (including whether any payments will be payable at all). In addition, unlisted factors may present significant additional obstacles to the realization of forward-looking statements. The Company cautions investors not to place undue reliance on any forward-looking statements. Any forward-looking statements contained in this communication represent the Company’s views only as of the date hereof and should not be relied upon as representing its views as of any subsequent date. The Company disclaims any obligation to publicly update or revise any such statements to reflect any change in expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements.

Additional Information and Where to Find It

The tender offer for the outstanding shares of the Company referenced in this communication has not yet commenced. This communication is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer to sell shares, nor is it a substitute for the tender offer materials that Parent and its subsidiary will file with the SEC. At the time the tender offer is commenced, Parent and its subsidiary will file tender offer materials on Schedule TO, and, thereafter, the Company will file a Solicitation/Recommendation Statement on Schedule 14D-9 with the SEC with respect to the tender offer.

THE TENDER OFFER MATERIALS (INCLUDING AN OFFER TO PURCHASE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER TENDER OFFER DOCUMENTS) AND THE SOLICITATION/RECOMMENDATION STATEMENT WILL CONTAIN IMPORTANT INFORMATION. HOLDERS OF SHARES OF THE COMPANY’S COMMON STOCK ARE URGED TO READ THESE DOCUMENTS CAREFULLY WHEN THEY BECOME AVAILABLE (AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME) BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION THAT HOLDERS OF SHARES OF THE COMPANY’S COMMON STOCK SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING TENDERING THEIR SHARES.

The Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents, as well as the Solicitation/Recommendation Statement, will be made available to all holders of shares of the Company’s common stock at no expense to them. The tender offer materials and the Solicitation/Recommendation Statement will be made available for free at the SEC’s website at www.sec.gov or by accessing the Investor Relations section of the Company’s website at https://investors.rainoncology.com/.