Holding(s) in Company

For filings with the FCA include the annex

For filings with issuer exclude the annex

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

X

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

X

An event changing the breakdown of voting rights

Other (please specify):

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

Bank of America Corporation

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

Merrill Lynch Pierce Fenner & Smith Incorporated

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

14th June 2016

6. Date on which issuer notified:

16th June 2016

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

Above 3%

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

GB0030544687

Below notifiable threshold

Below notifiable threshold

0

0

2,078,628

0

0.791%

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

Equity Options - Call Option

20 Aug 2016

N/A

240,000

0.091%

Equity Options - Call Option

18 Jun 2016

N/A

360,000

0.137%

Equity Options - Call Option

18 Jun 2016

N/A

692,400

0.263%

Equity Options - Put Option

16 Jul 2016

N/A

1,425,600

0.542%

Equity Options - Put Option

18 Jun 2016

N/A

2,256,000

0.858%

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

Swaps

N/A

28 Feb 2017

N/A

1,273,680

0.484%

0.484%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

8,326,308

3.167%

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

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 hold voting rights:

13. Additional information:

14. Contact name:

Harshini Gopa

15. Contact telephone number:

0207 996 3410