Tullow Oil : Inside Information / Ad Hoc Information

NOTICE OF MANDATORY PREPAYMENT

TULLOW OIL PLC

(the "Issuer")

10¼% Senior Secured Notes due 2026 (the "Notes")

CUSIP: G91237AB6 (Regulation S) and 899415AG8 (Rule 144A)

1. The Notes were issued pursuant to an indenture dated May 17, 2021 (the "Indenture") among, inter alios, the Issuer, Deutsche Trustee Company Limited as trustee (the "Trustee"), Deutsche Bank
   Trust Company Americas as principal paying agent, transfer agent and registrar and Deutsche Bank AG, London Branch as London Paying Agent. We refer to the Indenture. Capitalized terms used but not otherwise defined in this prepayment notice shall have the meanings given in the Indenture.
2. We hereby give you notice that on May 15, 2023 (the " Prepayment Date"), the Issuer intends to prepay $100,000,000, of which $79,991,000.00 will be in respect of the Regulation S CUSIP G91237AB6 and $20,009,000.00 will be in respect of the Rule 144A CUSIP 899415AG8, at a prepayment price equal to 100% of the aggregate principal amount of Notes in accordance with Section 3.11 (Mandatory Prepayments; No Sinking Fund) of the Indenture.
3. The prepayment price of the Notes is 100.000% of the principal amount of the Notes to be prepaid, plus accrued and unpaid interest from May 15, 2023 (the last interest payment date for which interest on the Notes was paid) (the "Prepayment Price"). The Prepayment Price will, in accordance with Section 3.11 (Mandatory Prepayments; No Sinking Fund) of the Indenture, be paid to holders selected by lot on the Business Day immediately prior to the Prepayment Date.
4. In order for a Holder to collect the Prepayment Price, the Notes called for prepayment must be surrendered to Deutsche Bank Trust Company Americas, Trust & Agency Services, 1 Columbus Circle , New York, New York 10019, USA, Attn: Corporates Team Deal Manager - TULLOW OIL 2026, as Principal Paying Agent.
5. Unless the Issuer defaults in making such payment of the Prepayment Price, interest on the Notes called for prepayment shall cease to accrue on and after the Prepayment Date.
6. The ISIN and CUSIP numbers in relation to the Notes being prepaid are as set forth above and are included solely for the convenience of holders of the Notes. No representation is made as to the correctness of such numbers listed in this Notice of Prepayment or printed on the Notes.
7. This prepayment notice and any non-contractual obligations arising out of or in connection with it are governed by New York law.

Any questions regarding this Notice of Prepayment should be directed to the Issuer at:

Tullow Oil plc

9 Chiswick Park

566 Chiswick High Road London W4 5XT United Kingdom

Fax: [phone]

Attention: Chris Perry

Issued by: Tullow Oil plc

Dated: May 9, 2023

• This CUSIP number has been assigned to this issue by Standard and Poor's Corporation and is included solely for the convenience of the Holders. Neither the Issuer, the Trustee nor the Paying Agent or any of their agents shall be responsible for the selection or use of this CUSIP number, nor is any representation made as to its correctness on the Notes or as indicated in any redemption notice.

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