Gulf Marine Services Regulatory News (GMS)

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

Gulf Marine Services 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

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 the notification obligation: iii

Wasatch Advisors, Inc.

4. Full name of shareholder(s)

(if different from 3.): iv

5. Date of the transaction and date on which the threshold is crossed or reached: v

May 7, 2015

6. Date on which issuer notified:

May 8, 2015

7. Threshold(s) that is/are crossed or

reached: vi, vii

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

Indirect xii

Direct

Indirect

GB00BJVWTM27

10,415,541

10,415,541

10,571,088

3.02%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/ConversionPeriod xiv

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

% of votingrights

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

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate xvii

Exercise/Conversionperiod xviii

Number of votingrights instrumentrefers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

10,571,088

3.02%

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:

 Wasatch Advisors, Inc.

Cheryl Reich

Compliance Associate

15. Contact telephone number:

(801) 533-0777