UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)

December 12, 2018 (December 11, 2018)

Apptio, Inc.

(Exact name of registrant as specified in its charter)

11100 NE 8th Street, Suite 600

Bellevue, WA 98004

(Address of principal executive offices, including zip code)

(866) 470-0320

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

As previously announced, on November 9, 2018, Apptio, Inc., a Delaware corporation (“Apptio” or the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Bellevue Parent, LLC, a Delaware limited liability company (“Parent”), and Bellevue Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Parent (“Merger Sub”), providing for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent.

On December 11, 2018, a purported stockholder class action lawsuit captioned Bushansky v. Apptio, Inc. et. al., Case No. 1:18-cv-01954, was filed in the United States District Court for the District of Delaware against the Company and its directors. The lawsuit alleges, generally, that the Company and its directors violated Section 14(a) of the Securities Exchange Act of 1934 (the “Exchange Act”), and Rule 14a-9 thereunder by purportedly omitting material information from the proxy statement issued in connection with the Merger. The lawsuit also purports to allege violations of Section 20(a) of the Exchange Act against the Company’s directors. The lawsuit seeks, among other things, equitable relief that would enjoin the consummation of the proposed Merger, rescission of the proposed Merger to the extent it is consummated, and attorneys’ fees and costs. Additional similar lawsuits may be filed in the future. The Company believes that the plaintiff’s allegations lack merit and will vigorously defend against this and any subsequently filed similar actions. The foregoing description is qualified in its entirety by reference to the complaint which is attached as Exhibit 99.1 and incorporated by reference herein.

Additional Information and Where to Find It

This communication is being made in respect of the proposed transaction involving Apptio and Parent. In connection with the proposed transaction, Apptio has filed a definitive proxy statement on Schedule 14A with the Securities and Exchange Commission (the “SEC”). Promptly after filing its definitive proxy statement with the SEC, Apptio mailed the definitive proxy statement and a proxy card to each stockholder of Apptio entitled to vote at the special meeting relating to the proposed transaction. This communication is not a substitute for the proxy statement or any other document that Apptio may file with the SEC or send to its stockholders in connection with the proposed transaction. The definitive proxy statement described above contains important information about the proposed transaction and related matters. BEFORE MAKING ANY VOTING DECISION, STOCKHOLDERS OF APPTIO ARE URGED TO READ THESE MATERIALS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS IN CONNECTION WITH THE PROPOSED TRANSACTION THAT APPTIO WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT APPTIO AND THE PROPOSED TRANSACTION. The definitive proxy statement and other relevant materials in connection with the proposed transaction (when they become available), and any other documents filed by Apptio with the SEC, may be obtained free of charge at the SEC’s website (http://www.sec.gov) or at Apptio’s website (http://www.apptio.com) or by contacting Apptio’s Investor Relations at ir@apptio.com.

Participants in the Solicitation

Apptio and its directors and executive officers may be deemed to be participants in the solicitation of proxies from Apptio’s stockholders with respect to the proposed transaction. Information about Apptio’s directors and executive officers and their ownership of Apptio’s common stock is set forth in Apptio’s definitive proxy statement on Schedule 14A filed with the SEC on December 10, 2018, Apptio’s proxy statement for its 2018 Annual Meeting of Stockholders, which was filed with the SEC on April 19, 2018, and Apptio’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which was filed with the SEC on February 21, 2018. Additional information regarding the potential participants, and their direct or indirect interests in the proposed transaction, by security holdings or otherwise, are set forth in the definitive proxy statement and other materials on file with the SEC in connection with the proposed transaction.

Notice Regarding Forward-Looking Statements

This communication, and any documents to which Apptio refers you in this communication, contains not only historical information, but also forward-looking statements made pursuant to the safe-harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements represent Apptio’s current expectations or beliefs concerning future events, including but not limited to the expected completion and timing of the proposed transaction, expected benefits and costs of the proposed transaction, management plans and other information relating to the proposed transaction, strategies and objectives of Apptio for future operations and other information relating to the proposed transaction. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “intends,” “forecasts,” “should,” “estimates,” “contemplate,” “future,” “goal,” “potential,” “predict,” “project,” “projection,” “target,” “seek,” “may,” “will,” “could,” “should,” “would,” “assuming,” and similar expressions are intended to identify forward-looking statements. You should read any such forward-looking statements carefully, as they involve a number of risks, uncertainties and assumptions that may cause

actual results to differ significantly from those projected or contemplated in any such forward-looking statement. Those risks, uncertainties and assumptions include, (i) the risk that the proposed transaction may not be completed in a timely manner or at all, which may adversely affect Apptio’s business and the price of the common stock of Apptio, (ii) the failure to satisfy any of the conditions to the consummation of the proposed transaction, including the adoption of the merger agreement by the stockholders of Apptio and the receipt of certain regulatory approvals, (iii) the occurrence of any event, change or other circumstance or condition that could give rise to the termination of the merger agreement, (iv) the effect of the announcement or pendency of the proposed transaction on Apptio’s business relationships, operating results and business generally, (v) risks that the proposed transaction disrupts current plans and operations and the potential difficulties in employee retention as a result of the proposed transaction, (vi) risks related to diverting management’s attention from Apptio’s ongoing business operations, (vii) the outcome of any legal proceedings that may be instituted against us related to the merger agreement or the proposed transaction, (viii) unexpected costs, charges or expenses resulting from the proposed transaction, and (ix) other risks described in Apptio’s filings with the SEC, such as its Quarterly Reports on Form 10-Q and Annual Reports on Form 10-K. Forward-looking statements speak only as of the date of this communication or the date of any document incorporated by reference in this document. Except as required by applicable law or regulation, Apptio does not assume any obligation to update any such forward-looking statements whether as the result of new developments or otherwise.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: December 12, 2018