Holding(s) in Company

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| Source: EnQuest PLC
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|For   filings  |            |
|with the FCA   |            |
|include the    |            |
|annex          |            |
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|For   filings  |            |
|with issuer    |            |
|exclude the    |            |
|annex          |            |
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|                            |
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|TR-1:                       |
|NOTIFICATION                |
|OF MAJOR                    |
|INTEREST IN                 |
|SHARESi                     |
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|                |           |
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|1. Identity of  |Enquest plc|
|the issuer or   |           |
|the             |           |
|underlying      |           |
|issuer          |           |
|  of existing   |           |
|shares to       |           |
|which voting    |           |
|rights are      |           |
|  attached:ii   |           |
+---------+----++++----------+
|2 Reason for                |
|the                         |
|notification                |
|(please tick                |
|the                         |
|appropriate                 |
|box or boxes):              |
+---------+----++++----------+
|An               |YES       |
|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):|       |          |
+---------+----++++----------+
|3. Full name  |Montanaro    |
|of person(s)  |  Asset      |
|subject to    |Management   |
|the           |Limited      |
|  notification|             |
|obligation:   |             |
|iii           |             |
+---------+----++++----------+
|4. Full name  |             |
|of            |             |
|shareholder(s)|             |
|  (if         |             |
|different from|             |
|3.):iv        |             |
+---------+----++++----------+
|5. Date of the|7 August     |
|transaction   |2014         |
|and date   on |             |
|  which the   |             |
|threshold is  |             |
|crossed or    |             |
|  reached:   v|             |
+---------+----++++----------+
|6. Date on    |11 August    |
|which issuer  |  2014       |
|notified:     |             |
+---------+----++++----------+
|7.            |4%           |
|Threshold(s)  |             |
|that is/are   |             |
|crossed   or  |             |
|  reached: vi,|             |
|  vii         |             |
+---------+----++++----------+
|         |    ||||          |
+---------+----++++----------+

+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|8. Notified details:
|
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-----++---------------+------------+----------------++------------------++------
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|A: Voting rights attached to shares viii, ix
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Class/type of        |Situation previous                   |Resulting
|situation       |after the   |triggering                          |transaction|
|  shares             |  to the triggering                  |
|                |            |                                    |           |
|  if   possible using|  transaction                        |
|                |            |                                    |           |
|  the ISIN CODE      |                                     |
|                |            |                                    |           |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                     |Number         |Number               |Number
|Number of voting|            |% of voting rights x                |           |
|                     |  of           |  of                 |  of shares
|  rights        |            |                                    |           |
|                     |  Shares       |  Voting             |
|                |            |                                    |           |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                     |               |Rights               |Direct
|Direct xi       |Indirect xii|Direct                              |Indirect   |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|GB00B635TG28         |32,367,789     |32,367,789           |31,999,073
|31,999,073      |            |3.99%                               |           |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
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|B: Qualifying Financial Instruments
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Resulting situation   after the triggering transaction
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Type of financial      |Expiration              |Exercise/
|Number of voting                              |% of voting                   |
|  instrument           |  date xiii             |  Conversion Period xiv
|  rights that may be                          |  rights                      |
|                       |                        |
|  acquired if the                             |                              |
|                       |                        |
|  instrument is                               |                              |
|                       |                        |
|  exercised/ converted.                       |                              |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                       |                        |
|                                              |                              |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
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|
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
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|C: Financial Instruments with   similar economic effect to Qualifying Financial
Instruments xv, xvi
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Resulting situation   after the triggering transaction
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Type of financial     |Exercise price|Expiration date xvii|Exercise/
|Number of voting   rights instrument refers to|% of voting rights xix, xx     |
|  instrument          |              |                    |  Conversion period
xviii|                                              |
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                      |              |                    |
|                                              |Nominal             |Delta     |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                       |             |
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
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|
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
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|Total (A+B+C)
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|Number of voting   rights                                   |Percentage of
voting rights
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|31,999,073                                                  |3.99%
|
+---------------------+++-------------+----------+---------+++------------------
-----++---------------+------------+----------------++------------------++------
----+
|                     |||             |          |         |||
||               |            |                ||                  ||          |
+---------------------+++-------------+----------+---------+++------------------
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+------------+-+-----------+
|9. Chain of               |
|controlled                |
|undertakings              |
|through which             |
|the voting                |
|rights and/or             |
|the                       |
|  financial               |
|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.       |  Notificatio|
|Additional  |n is based   |
|information:|on total     |
|            |voting       |
|            |rights       |
|            |figure of    |
|            |802,660,757  |
+------------+-+-----------+
|14. Contact |Stefan       |
|name:       |Ricketts,    |
|            |General      |
|            |Counsel and  |
|            |Company      |
|            |Secretary    |
+------------+-+-----------+
|15. Contact |020 7925     |
|telephone   |4990         |
|number:     |             |
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|            | |           |
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