Timing of General Meeting and Circular

21 October 2019

Motif Bio plc

("Motif Bio", or "the Company")

Timing of General Meeting and Circular

Motif Bio plc (AIM/NASDAQ: MTFB) today announced that the Circular mentioned in the Company's 2 October 2019 press release, is expected to be posted to shareholders this week. The Circular will include details of the Resolutions which shareholders will be asked to approve at the General Meeting.

All defined terms in this announcement shall have the same meaning as described in the Company's announcement of 2 October 2019.

The person responsible for the release of this announcement on behalf of Motif Bio plc is Jonathan Gold, Interim Chief Financial Officer.

This announcement contains inside information for the purposes of Article 7 of Regulation (EU) 596/2014.

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Forward-Looking Statements

This press release contains forward-looking statements. Words such as "expect," "believe," "intend," "plan," "continue," "may," "will," "anticipate," and similar expressions are intended to identify forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties and other important factors that may cause Motif Bio's actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Motif Bio believes that these factors include, but are not limited to, (i) Motif Bio's ability to obtain shareholder approval in connection with the Proposed Restructuring, (ii) Motif Bio's ability to execute the Proposed Capital Raise and Proposed Restructuring (iii) the timing, progress and the results of clinical trials for Motif Bio's product candidates, (iv) the timing, scope or likelihood of regulatory filings and approvals for Motif Bio's product candidates, (v) Motif Bio's ability to successfully commercialise its product candidates, (vi) Motif Bio's ability to effectively market any product candidates that receive regulatory approval, (vii) Motif Bio's commercialisation, marketing and manufacturing capabilities and strategy, (viii) Motif Bio's expectation regarding the safety and efficacy of its product candidates, (ix) the potential clinical utility and benefits of Motif Bio's product candidates, (x) Motif Bio's ability to advance its product candidates through various stages of development, especially through pivotal safety and efficacy trials, (xi) Motif Bio's estimates regarding the potential market opportunity for its product candidates, (xii) Motif Bio's ability to raise additional capital to sustain its operations and pursue its strategy and (xiii) the factors discussed in the section entitled "Risk Factors" in Motif Bio's Annual Report on Form 20-F filed with the SEC on April 15, 2019, which is available on the SEC's web site, www.sec.gov. Additionally, there can be no assurance that Motif Bio will regain compliance with Nasdaq rules or maintain its ADS listing on Nasdaq. Motif Bio undertakes no obligation to update or revise any forward-looking statements.