VAALCO Energy : Q1 2024 Supplemental Information

SAFE HARBOR STATEMENT

This presentation includes "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act") and Section 21E of the Securities Exchange Act of 1934, as amended, which are intended to be covered by the safe harbors created by those laws and other applicable laws and "forward-looking information" within the meaning of applicable Canadian securities laws. Where a forward-looking statement expresses or implies an expectation or belief as to future events or results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. All statements other than statements of historical fact may be forward-looking statements. The words "anticipate," "believe," "estimate," "expect," "intend," "forecast," "outlook," "aim," "target," "will," "could," "should," "may," "likely," "plan" and "probably" or similar words may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking.Forward-looking statements in this press release include, but are not limited to, statements relating to (i) estimates of future drilling, production, sales and costs of acquiring crude oil, natural gas and natural gas liquids; (ii) expectations regarding VAALCO's ability to effectively integrate assets and properties it has acquired as a result of the Svenska acquisition into its operations; (iii) expectations regarding future exploration and the development, growth and potential of VAALCO's operations, project pipeline and investments, and schedule and anticipated benefits to be derived therefrom; (iv) expectations regarding future acquisitions, investments or divestitures; (v) expectations of future dividends, buybacks and other potential returns to stockholders; (vi) expectations of future balance sheet strength; (vii) expectations of future equity and enterprise value; and (viii) VAALCO's ability to finalize documents and effectively execute the POD for the Venus development in Block P.

Such forward-looking statements are subject to risks, uncertainties and other factors, which could cause actual results to differ materially from future results expressed, projected or implied by the forward-looking statements. These risks and uncertainties include, but are not limited to: risks relating to any unforeseen liabilities of VAALCO; the ability to generate cash flows that, along with cash on hand, will be sufficient to support operations and cash requirements; risks relating to the timing and costs of completion for scheduled maintenance of the FPSO servicing the Baobab field; and the risks described under the caption "Risk Factors" in VAALCO's 2023 Annual Report on Form 10-K filed with the SEC on March 15, 2024.

Dividends beyond the second quarter of 2024 have not yet been approved or declared by the Board of Directors for VAALCO. The declaration and payment of future dividends remains at the discretion of the Board and will be determined based on VAALCO's financial results, balance sheet strength, cash and liquidity requirements, future prospects, crude oil and natural gas prices, and other factors deemed relevant by the Board. The Board reserves all powers related to the declaration and payment of dividends. Consequently, in determining the dividend to be declared and paid on VAALCO common stock, the Board may revise or terminate the payment level at any time without prior notice.

Oil and Natural Gas Reserves

This announcement contains crude oil and natural gas metrics which do not have standardized meanings or standard methods of calculation as classified by the SEC and therefore such measures may not be comparable to similar measures used by other companies. Such metrics have been included herein to provide readers with additional measures to evaluate the proposed Acquisition; however, such measures may not be reliable indicators of the future performance of Svenska and future performance.

WI CPR Reserves

WI CPR reserves represent proved (1P) and proved plus probable (2P) estimates as reported by Petroleum Development Consultants Limited and prepared in accordance with the definitions and guidelines set forth in the 2018 Petroleum Resources Management Systems approved by the Society of Petroleum Engineers. Reserve estimates for Svenska are as of October 1, 2023. The SEC definitions of proved and probable reserves are different from the definitions contained in the 2018 Petroleum Resources Management Systems approved by the Society of Petroleum Engineers. As a result, 1P and 2P WI CPR reserves may not be comparable to United States standards. The SEC requires United States oil and gas reporting companies, in their filings with the SEC, to disclose only proved reserves after the deduction of royalties and production due to others but permits the optional disclosure of probable and possible reserves in accordance with SEC definitions.

2P WI CPR reserves for VAALCO, as disclosed herein, may differ from the SEC definitions of proved and probable reserves because:

•Pricing for SEC is the average closing price on the first trading day of each month for the prior year which is then held flat in the future, while the 2P WI CPR pricing is based on management pricing assumptions for future Brent oil pricing for 2024 of $80.00 and $70.00 in 2025, escalated 2% per year thereafter and for Equatorial Guinea, given the expectation of first oil beginning in 2026, Brent oil pricing of $74.27 was assumed for 2026, escalated 2% per year thereafter;

•Lease operating expenses are not escalated in the SEC case, while for the 2P WI CPR reserves case they are escalated at 2% annually beginning on January 1, 2024.

1P and 2P WI CPR reserves for Svenska, as disclosed herein, may differ from the SEC definitions of proved and probable reserves because:

•Pricing for SEC is the average closing price on the first trading day of each month for the prior year which is then held flat in the future, while the 1P and 2P WI CPR pricing for Svenska is based on pricing assumptions for future Brent oil pricing for 2023 of $84.5 and up to 2030 the Brent Oil price follows the average of four available forecasts and assumes flat real thereafter. Oil price is escalated 2% per year;

•Lease operating expenses are typically not escalated under the SEC rules, while for the WI CPR reserve estimates they are escalated at 2% annually beginning in 2024.

Management uses 1P and 2P WI CPR reserves as a measurement of operating performance because it assists management in strategic planning, budgeting and economic evaluations and in comparing the operating performance of VAALCO and Svenska to other companies. Management believes that the presentation of 1P and 2P WI CPR reserves is useful to its international investors, particularly those that invest in companies trading on the London Stock Exchange, in order to better compare reserve information to other London Stock Exchange-traded companies that report similar measures. However, 1P and 2P WI CPR reserves should not be used as a substitute for proved reserves calculated in accordance with the definitions prescribed by the SEC. In evaluating VAALCO's business, investors should rely on VAALCO's SEC proved reserves and consider 1P and 2P WI CPR reserves only supplementally. Following consummation of the Acquisition, VAACLO will report Svenska's reserves in accordance with the definitions and regulations promulgated by the SEC.

Other Oil and Gas Advisories

Investors are cautioned when viewing BOEs in isolation. A BOE conversation ratio of six thousand cubic feet of natural gas to one barrel of oil equivalent (6 MCF: 1 Bbl) is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead. Given that the value ratio based on the current price of crude oil as compared to natural gas is significantly different from the energy equivalency of 6:1, utilizing a conversion on a 6:1 basis may be an incomplete as an indication of value.

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Q1 2024 Supplemental Information: Profitably and Sustainably Growing Value May 2024