Holding(s) in Company

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

GW Pharmaceuticals 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

X

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):

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

Scopia Capital Management LP

Scopia Management, Inc.

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

Goldman Sachs & Co.

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

20 June 2016

6. Date on which issuer notified:

22 June 2016

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

5%

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

Not Applicable

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 Receipts

US36197T1034

Not Applicable

Not Applicable

13,802,724

5.25%

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

Not Applicable

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

13,802,724

5.25%

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

Scopia Capital Management LP is the investment manager of certain funds that beneficially own the financial instruments disclosed in Section 8 of this form and which controls the voting rights attached those financial instruments.

Scopia Management, Inc. is the general partner of Scopia Capital Management LP

Proxy Voting:

10. Name of the proxy holder:

Not Applicable

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

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

13. Additional information:

14. Contact name:

Samantha Nasello, Chief Compliance Officer

15. Contact telephone number:

+1.212.370.0304