MTFB.L Regulatory News (MTFB)

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

Motif Bio plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

Issue of ADSs on Initial Public Offering on Nasdaq

Y

3. Full name of person(s) subject to thenotification obligation: iii

Sabby Healthcare Master Fund, Ltd

Sabby Management, LLC

Hal Mintz

4. Full name of shareholder(s)  (if different from 3.):iv

Sabby Healthcare Master Fund, Ltd

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

23 November 2016

6. Date on which issuer notified:

30 November 2016

7. Threshold(s) that is/are crossed orreached: vi, vii

>9%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

American Depositary Shares

17,191,980

9.52

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

17,191,980

9.52

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi

Hal Mintz is manager of Sabby Management LLC, which serves as the investment manager of Sabby Healthcare Master Fund Ltd. Each of Sabby Management, LLC and Hal Mintz disclaims beneficial ownership over the securities listed except to the extent of their pecuniary interest therein.

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to holdvoting rights:

13. Additional information:

14. Contact name:

Robert Grundstein

15. Contact telephone number:

646-307-4500