DISCLAIMER

The views expressed on this website represent the opinions of Engaged Capital, LLC and certain of its affiliates (collectively, “Engaged”), which beneficially own shares of BlackLine, Inc. (the “Company”), and are based on publicly available information with respect to the Company. Engaged recognizes that there may be confidential information in the possession of the Company that could lead it or others to disagree with Engaged’s conclusions. Engaged reserves the right to change any of the opinions expressed herein at any time as it deems appropriate and disclaims any obligation to notify the market or any other party of any such changes. Engaged disclaims any obligation to update the information or opinions contained on this website.

Certain financial projections and statements made herein have been derived or obtained from filings made with the Securities and Exchange Commission (the “SEC”) or other regulatory authorities and from other third-party reports. Engaged shall not be responsible nor have any liability for any misinformation contained in any third-party SEC or other regulatory filing or third-party report. There is no assurance or guarantee with respect to the prices at which any securities of the Company will trade, and such securities may not trade at prices that may be implied herein. The estimates, projections and potential impact of the opportunities identified by Engaged herein are based on assumptions that Engaged believes to be reasonable as of the date of the materials on this website, but there can be no assurance or guarantee that actual results or performance of the Company will not differ, and such differences may be material.

The materials on this website are provided merely as information and are not intended to be, nor should they be construed as, an offer to sell or a solicitation of an offer to buy any security. These materials do not recommend the purchase or sale of any security. Engaged currently beneficially owns shares of the Company. It is possible that there will be developments in the future that cause Engaged from time to time to buy shares of the Company (in open market or privately negotiated transactions or otherwise), sell all or a portion of its holdings of the Company in open market transactions or otherwise (including via short sales), or trade in options, puts, calls or other derivative instruments relating to the shares of the Company.

Although Engaged believes the statements made in this website are substantially accurate in all material respects and does not omit to state material facts necessary to make those statements not misleading, Engaged makes no representation or warranty, express or implied, as to the accuracy or completeness of those statements or any other written or oral communication it makes with respect to the Company and any other companies mentioned, and Engaged expressly disclaims any liability relating to those statements or communications (or any inaccuracies or omissions therein). Thus, stockholders and others should conduct their own independent investigation and analysis of those statements and communications and of the Company and any other companies to which those statements or communications may be relevant.

This website may contain links to articles and/or videos (collectively, “Media”). The views and opinions expressed in such Media are those of the author(s)/speaker(s) referenced or quoted in such Media and, unless specifically noted otherwise, do not necessarily represent the opinion of Engaged.

This website is intended to express Engaged’s views and inform stockholders so that they may make an informed decision regarding the anticipated proxy solicitation, as explained in greater detail below.

Cautionary Statement Regarding Forward-Looking Statements

The materials on this website may contain forward-looking statements. All statements contained herein that are not clearly historical in nature or that necessarily depend on future events are forward-looking, and the words “anticipate,” “believe,” “expect,” “potential,” “opportunity,” “estimate,” “plan,” and similar expressions are generally intended to identify forward-looking statements. The projected results and statements contained herein that are not historical facts are based on current expectations, speak only as of the date of these materials and involve risks, uncertainties and other factors that may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such projected results and statements. Assumptions relating to the foregoing involve judgments with respect to, among other things, future economic, competitive and market conditions and future business decisions, all of which are difficult or impossible to predict accurately and many of which are beyond the control of Engaged. Although Engaged believes that the assumptions underlying the projected results or forward-looking statements are reasonable as of the date of these materials, any of the assumptions could be inaccurate and therefore, there can be no assurance that the projected results or forward-looking statements included herein will prove to be accurate. In light of the significant uncertainties inherent in the projected results and forward-looking statements included herein, the inclusion of such information should not be regarded as a representation as to future results or that the objectives and strategic initiatives expressed or implied by such projected results and forward-looking statements will be achieved. Engaged will not undertake and specifically declines any obligation to disclose the results of any revisions that may be made to any projected results or forward-looking statements herein to reflect events or circumstances after the date of such projected results or statements or to reflect the occurrence of anticipated or unanticipated events.

CERTAIN INFORMATION CONCERNING THE PARTICIPANTS

Engaged Capital, LLC (“Engaged Capital”), together with the other participants named herein, intends to file a preliminary proxy statement and accompanying BLUE universal proxy card with the Securities and Exchange Commission (“SEC”) to be used to solicit votes for the election of its slate of highly qualified director nominees at the 2026 annual meeting of stockholders of BlackLine, Inc., a Delaware corporation (the “Company”).

ENGAGED CAPITAL STRONGLY ADVISES ALL STOCKHOLDERS OF THE COMPANY TO READ THE PROXY STATEMENT AND OTHER PROXY MATERIALS, INCLUDING A PROXY CARD, AS THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. SUCH PROXY MATERIALS WILL BE AVAILABLE AT NO CHARGE ON THE SEC'S WEB SITE AT HTTP://WWW.SEC.GOV. IN ADDITION, THE PARTICIPANTS IN THIS PROXY SOLICITATION WILL PROVIDE COPIES OF THE PROXY STATEMENT WITHOUT CHARGE, WHEN AVAILABLE, UPON REQUEST. REQUESTS FOR COPIES SHOULD BE DIRECTED TO THE PARTICIPANTS’ PROXY SOLICITOR.

The participants in the anticipated proxy solicitation are expected to be Engaged Capital Flagship Master Fund, LP (“Engaged Capital Flagship Master”), Engaged Capital, Engaged Capital Holdings, LLC (“Engaged Holdings”), Glenn W. Welling, Storm Duncan, Christopher Hallenbeck, Christopher L. Young and Christopher B. Hetrick.

As of the date hereof, Engaged Capital Flagship Master directly beneficially owns 1,015,619 shares of Common Stock, $0.01 par value per share (the “Common Stock”), of the Company. Engaged Capital, as the general partner and investment adviser of Engaged Capital Flagship Master, may be deemed to beneficially own the 1,015,619 shares of Common Stock owned by Engaged Capital Flagship Master. Engaged Holdings, as the managing member of Engaged Capital, may be deemed to beneficially own the 1,015,619 shares of Common Stock owned by Engaged Capital Flagship Master. Mr. Welling, as the Founder and Chief Investment Officer of Engaged Capital and sole member of Engaged Holdings, may be deemed to beneficially own the 1,015,619 shares of Common Stock owned by Engaged Capital Flagship Master. As of the date hereof, Messrs. Duncan, Hallenbeck, Young and Hetrick do not beneficially own any shares of Common Stock.