Eni S p A : Notice of Shareholders' Meeting 2023

Eni S.p.A.

Sede Legale

Piazzale Enrico Mattei,1 - 00144 Roma Capitale sociale Euro 4.005.358.876,00 i.v.

Registro Imprese di Roma, Codice Fiscale 00484960588 Partita IVA 00905811006, R.E.A. Roma n. 756453 Sedi secondarie

Via Emilia, 1 e Piazza Ezio Vanoni, 1 20097 San Donato Milanese (MI)

Published on March 30,2023

Notice of ordinary and extraordinary shareholders' meeting 2023

Notice of Ordinary and Extraordinary Shareholders' Meeting

Shareholders of Eni S.p.A. (hereinafter «Eni» or «Company») are hereby invited to attend the Ordinary and Extraordinary Shareholders' Meeting which will be held in Rome, Piazzale Enrico Mattei, 1, 00144, on May 10, 2023 at 10:00 am, on single call, to discuss and decide on the following

Agenda

(ordinary part)

1. Eni S.p.A. financial statements at December 31, 2022. Related resolutions. Presentation of consolidated financial statements at December 31, 2022. Reports of the Directors, the Board of Statutory Auditors and the Audit Firm.
2. Allocation of net profit.
3. Determination of the number of members of the Board of Directors.
4. Determination of the Directors' term of office.
5. Appointment of the Directors.
6. Appointment of the Chairman of the Board of Directors.
7. Determination of the remuneration of the Chairman of the Board of Directors and the Directors.
8. Appointment of the Statutory Auditors.
9. Appointment of the Chairman of the Board of Statutory Auditors.
10. Determination of the remuneration of the Chairman of the Board of Statutory Auditors and of standing Statutory Auditors.
11. Long term incentive Plan 2023-2025 and disposal of Eni treasury shares to serve the Plan.
12. Report on remuneration policy and remuneration paid (Section I): 2023-2026 remuneration policy.
13. Report on remuneration policy and remuneration paid (Section II): remuneration paid in 2022.
14. Authorisation for the purchase and disposal of treasury shares; related and consequent resolutions.
15. Use of available reserves for and in place of the 2023 dividend.

(extraordinary part)

1. Reduction and use of the reserve pursuant to Law 342/2000 for and in place of the 2023 dividend.
2. Cancellation of Eni treasury shares, without reduction of the share capital and consequent

amendments to Article 5.1 of the By-laws; related and consequent resolutions.

18. Cancellation of any treasury shares to be purchased under the terms of the authorisation pursuant to item 14 on the agenda of the ordinary part, without reduction of the share capital, and consequent amendments to Article 5 of the By-laws; related and consequent resolutions.

***

1. Procedures for holding the Shareholders' Meeting In accordance with Article 106, fourth paragraph, second sentence, of Decree Law no. 18 of March 17, 2020 containing "Measures to strengthen the National Health Service and provide economic support for families, workers and businesses connected with the COVID-19epidemiological emergency", ratified by Law no. 27 of April 24, 2020, and Decree Law no. 198 of December 29, 2022, ratified by Law no. 14 of February 24, 2023, extending the measures of Art. 106 to the Shareholders' Meetings held by July 31, 2023, participation in the Shareholders' Meeting shall take place solely through the Shareholders' representative designated pursuant to Article 135-undeciesof Legislative Decree no. 58 of February 24, 1998 (Consolidated Law on Finance, hereinafter "T.U.F.") as identified in paragraph 5 below (hereinafter "Shareholders' Representative"). The Shareholders' Representative may also be granted proxies or sub-proxiespursuant to Article 135-noviesof T.U.F., in derogation from the provisions of Article 135- undecies, paragraph 4, of that decree, as indicated in paragraph 5 below. In accordance with the provisions of Article 106, paragraph 2, of the aforementioned decree, without prejudice to the foregoing, the other persons whose participation in the Shareholders' Meeting is required in order to guarantee the regular conduct of the Meeting may also participate by telecommunication systems that guarantee their identification, without it in any case being necessary that the Chairman, the Secretary and the notary are in the same location.
2. Right to attend and to vote at the Shareholders' Meeting
   Pursuant to Article 83-sexies of the T.U.F. and Article

13.2 of the By-laws and in accordance with the provisions of Article 106 of Decree Law no. 18/2020, those entitled to attend and to vote at the Shareholders' Meeting, exclusively through the Shareholders' Representative, are those on behalf of whom the

1

Eni S.p.A.

Sede Legale

Piazzale Enrico Mattei,1 - 00144 Roma Capitale sociale Euro 4.005.358.876,00 i.v.

Registro Imprese di Roma, Codice Fiscale 00484960588 Partita IVA 00905811006, R.E.A. Roma n. 756453 Sedi secondarie

Via Emilia, 1 e Piazza Ezio Vanoni, 1 20097 San Donato Milanese (MI)

Published on March 30,2023

Notice of ordinary and extraordinary shareholders' meeting 2023

intermediary	authorized	pursuant	to	applicable
regulations	has sent to the	Company	the	statement

certifying entitlement to the relative right, at the end of the seventh trading day prior to the date of the Shareholders' Meeting on single call (April 28, 2023 - the record date). The statement must be received by Eni by the end of the third trading day prior to the date scheduled for the Shareholders' Meeting (May 5, 2023). The right to attend and to vote in the Shareholders' Meeting, exercised exclusively through the Shareholders' Representative, is ensured even if the statement is received by the Company after the deadline indicated above, as long as it is received by the opening of the Shareholders' Meeting. Those who become Shareholders only after the record date shall not be entitled to exercise the right to participate and to vote in the Meeting and, therefore, shall not grant a proxy to the Shareholders' Representative. Please note that the statement is sent to Eni by the intermediary upon request of the person entitled to the right. Those entitled to vote are required to give instructions to the intermediary that keeps the related accounts to send the aforementioned statement to the Company. Any requests for prior notice or fees requested at fulfilling the duties of the intermediary are not ascribable to the Company. In order to attend the Shareholders' Meeting, those holding shares not yet in dematerialized form shall first deliver these shares to an authorised intermediary, who will have them dematerialised in the Central Depository System, and shall then request the above-mentioned statement of attendance. The right to attend and vote in the Shareholders' Meeting is subject to the applicable regulatory provisions and is allowed within the limits of any sanctions and restrictive measures, adopted at national and international level, pro tempore in force.

3. Right to ask questions prior to the Shareholders' Meeting

Pursuant to Article 127-ter of the T.U.F., those entitled to vote for which the Company has received within the third day following the record date (May 2), according to the procedures indicated on the website, the statement provided by the authorised intermediary attesting ownership of Eni shares pursuant to applicable legislation (see paragraph 2 above), may ask questions on items on the agenda prior to the Shareholders' Meeting: the questions must be received by the Company no later than on April 28, 2023; the Company does not guarantee an answer to the questions received after that deadline.

The questions may be sent a) by e-mail at the address [e-mail], b) by certified e- mail at the address [e-mail]

1. through the appropriate section of the Company's website dedicated to the Shareholders' Meeting. Questions received by the above deadline will be answered by May 7, 2023, through publication of the answer in the appropriate section of the Company's website devoted to the Shareholders' Meeting. Eni has decided to bring the time limit for providing answers forward with respect to the legal deadline in order to give Shareholders the time necessary to make an informed decision in granting any proxy to the Shareholders' Representative.
   The Company shall provide a single answer to questions having the same content. No reply is due when the requested information is available in "question and answer" form in the appropriate section of the Company's website or when the answer has already been published in that section.
   Further information is available on the Company's website.

4. Addition of items to the agenda of the Shareholders' Meeting and proposed resolutions on the items on the agenda

Pursuant to Article 126-bis of the T.U.F. and in accordance with the provisions of Article 13.1 of the By- laws, Shareholders who, severally or jointly, represent at least one fortieth of the Eni share capital, may ask, within ten days from the date of publication of this notice, to add other items to the agenda, specifying the additional proposed items in their request or presenting proposed resolutions on items already on the agenda. Matters upon which, according to law, the Shareholders' Meeting must resolve upon a proposal of the Board of Directors or on the basis of a project or report of the Board of Directors other than the report on the items in the agenda, may not be added to the agenda. Requests, together with the statement provided by the intermediary authorised attesting ownership of Eni shares, are submitted in writing to the Company's registered office by registered letter with return receipt or by certified e-mail to the address: [e-mail]. Moreover, a report on the proposed issues must be sent to the Company's Board of Directors by the Shareholders requesting the addition of items, in the same manner and within the same deadline.

2

Eni S.p.A.

Sede Legale

Piazzale Enrico Mattei,1 - 00144 Roma Capitale sociale Euro 4.005.358.876,00 i.v.

Registro Imprese di Roma, Codice Fiscale 00484960588 Partita IVA 00905811006, R.E.A. Roma n. 756453 Sedi secondarie

Via Emilia, 1 e Piazza Ezio Vanoni, 1 20097 San Donato Milanese (MI)

Published on March 30,2023

Notice of ordinary and extraordinary shareholders' meeting 2023

In any case, proposed resolutions on the items in the agenda may be presented individually and solely, through a proxy granted to the Shareholders' Representative, to the Shareholders' Meeting by persons entitled to vote.

Shareholders entitled to submit these proposals may inform the Company of their intention to present them in the Meeting by April 24, 2023 only by a) e-mail at the address [e-mail], or b) by

certified e-mail at the address [e-mail].

The Company will publish these proposals on its website by May 2, 2023 to allow all Shareholders to evaluate them and give the related voting instructions to the Shareholders' Representative. Entitlement to submit proposals shall be certified by the communication provided for by Article 83-sexies of the T.U.F. issued by the intermediary for the purpose of attending the Shareholders' Meeting and exercising the right to vote, which must be received by 6:00 p.m. (CET) on May 2, 2023 and certifying the right to vote as at the record date (April 28, 2023).

Shareholders' right to use the means of communication available to them to inform other Shareholders of the proposals they intend to submit at the Shareholders' Meeting shall be unaffected.

In the event of proposals for resolutions on the items on the agenda as alternatives to those submitted by the Board, the Board proposal will be put to a vote (unless it is withdrawn) and, only if this proposal is rejected, will the Shareholders' proposals be put to a vote. These proposals, even without a proposal from the Board, will be submitted to the Shareholders' Meeting starting from the proposal submitted by the Shareholders who represent the largest percentage of share capital. Only if the proposal put to a vote is rejected will the next proposal in order of amount of capital represented be put to a vote.

For the purposes of its publication, as well as in relation to the holding of the Shareholders' Meeting, the Company reserves the right to verify the relevance of the proposals with respect to the items on the agenda, their completeness, their compliance with the applicable legislation and the entitlement of the requesting Shareholders to submit the proposals.

Further information will be available on the Company's website.

1. Proxies conferred on the Shareholders' Representative designated by the Company

1. Pursuant to Article 135-undecies of the T.U.F. and Article 14.5 of the By-laws, the Company has designated Studio Legale Trevisan & Associati, in the person of Mr. Dario Trevisan (or his substitutes in case of impediment), as the representative to whom Shareholders may confer their proxy free of charge, with voting instructions on all or part of the proposals on the agenda. In this case, the proxy pursuant to Article 135-undecies of the T.U.F. must be conferred by signing the related proxy form to the Shareholders' Representative in accordance with the procedures specified therein, which will be available on the Company's website dedicated to the Shareholders' Meeting, or, in compliance with applicable regulations, at the Company's registered office. The form must be received by the end of the second trading day prior to the date scheduled for the Shareholders' meeting (no later than 23:59 on May 8, 2023), using one of the following alternative procedures: (i) for proxies signed in the original, sent by courier or registered mail with return receipt, at the following address:

Studio Legale Trevisan & Associati

Viale Majno, 45

20122 - Milan - Italy

or (ii) for proxies signed with a qualifying electronic signature or digital signature, at the certified e-mail address: [e-mail].

The proxy and related voting instructions pursuant to Article 135-undecies of the T.U.F. can always be revoked by the above deadline. The proxy shall not be valid for proposals on the agenda for which no voting instructions have been provided.

1. In accordance with the provisions of Decree Law no. 18/2020, the Shareholders' Representative may also be granted proxies or sub-proxies pursuant to Article 135- novies of the T.U.F., by those who have the right to vote. Proxies or sub-proxies - which shall be conferred by signing the related proxy form to the Shareholders' Representative in accordance with the procedures specified therein, which will be available on the Company's website dedicated to the Shareholders' Meeting - must be received, for organisational reasons, by 12:00 noon on May 9 to Studio Legale Trevisan, & Associati, using one of the following alternative procedures: (i) by post at the address indicated in point

1. or (ii) by certified e-mail to: rappresentante-

3

Eni S.p.A.

Sede Legale

Piazzale Enrico Mattei,1 - 00144 Roma Capitale sociale Euro 4.005.358.876,00 i.v.

Registro Imprese di Roma, Codice Fiscale 00484960588 Partita IVA 00905811006, R.E.A. Roma n. 756453 Sedi secondarie

Via Emilia, 1 e Piazza Ezio Vanoni, 1 20097 San Donato Milanese (MI)

Published on March 30,2023

Notice of ordinary and extraordinary shareholders' meeting 2023

[e-mail] to the e-mail address: [e-mail].

Proxies or sub-proxies must be also notified, without voting instructions, for organisational reasons, to the Company, by 12:00 noon on May 9: a) by certified e-

mail at the following address: [e-mail] or b) through the appropriate section of the Company's website dedicated to the Shareholders' Meeting, in accordance with the procedures specified therein.

The proxy and sub-proxy and related voting instructions given to the Shareholders' Representative may always be revoked in the same procedures specified for the conferment. A proxy form will be available on the Company's website dedicated to the Shareholders' Meeting or, in compliance with applicable regulations, at the Company's registered office. The proxy or the sub- proxy shall not be valid for proposals on the agenda for which no voting instructions have been provided.

The right to grant the proxies referred to in points 5.1 and

5.2 shall be certified by the notice provided for in Article 83-sexies of the T.U.F. issued by the intermediary for the purpose of attending the Shareholders' Meeting and exercising the right to vote (see paragraph 2 above).

Further information will be available on the Company's website.

The Shareholders' Representative is available to Shareholders for further clarifications at the toll-free number 800 134 679 and at the certified e-mail address [e-mail].

6. Holders of ADRs

The owners of ADRs, listed on the New York Stock Exchange, with each ADR representing two Eni ordinary shares, who are recorded in the Eni ADRs register of Citibank N.A, the ADR Depositary as at April 3, 2023, shall be entitled to exercise of their voting rights in accordance with the deposit and registration requirements contained in the "ADR Deposit Agreement", without prejudice to the provisions of paragraph 1 of this notice.

7. Appointment of the Directors and the Statutory Auditors

Pursuant to Articles 147-ter and 148 of the T.U.F. and Articles 17.3 and 28.2 of the By-laws, the Board of Directors and the Board of Statutory Auditors are appointed by the Shareholders' Meeting on the basis of slates presented by the Shareholders. Only those

Shareholders who, severally or jointly, represent at least 0.5% of the share capital are entitled to submit a slate. Ownership of the minimum holding needed to submit slates is determined with regard to the shares registered to the Shareholder on the date on which the slates are filed with the Company. The related statement provided by the authorized intermediary may be submitted to the Company, with the same procedures indicated below, after the filing provided that it is sent by 6:00 p.m. (CET) on April 19, 2023.

The slates must be filed at the Company's registered office in compliance with applicable regulations by April 17, 2023, together with the additional documentation required by applicable law and regulations.

The deadline for the filing of the slates would be on Saturday April 15, but it is extended to Monday April 17, 2023, which is the first following working day, in order to facilitate Shareholders in the presentation of slates.

Slates may be filed by certified e-mail at the address [e-mail].

For further information, please contact the Corporate Secretary's Office at the e-mail address [e-mail] or call the toll- free number 800 940 924.

For the submission, filing and publication of slates, please refer to the provisions of Articles 17 and 28 of the By-laws, the Company's website and the report of the Board on the items on the agenda of the Shareholder's Meeting, which will be available on the aforementioned website as provided by law.

With regard to the appointment of the Statutory Auditors, if as of the deadline noted above (April 17, 2023) only one slate, or only slates presented by Shareholders who are affiliated pursuant to Article 144-quinquies of the Consob Issuers Regulation, have been deposited, the deadline for presenting slates pursuant to Article 144- sexies, paragraph 5, of the Consob Issuers Regulation shall be postponed until the third day following that date (i.e. April 18, 2023). In such case, the threshold established for the presentation of slates is reduced by half (i.e. 0.25% of the share capital).

Articles 17.3 and 28.2 of the By-laws-- contain specific provisions on the composition of the slates. In particular, with regard to the appointment of the Board of Directors, Article 17.3 of the By-laws provides that at least two- fifths of the Board shall be made up of Directors of the less represented gender, rounding up to the next whole number, except in the case where the number of

4

Eni S.p.A.

Sede Legale

Piazzale Enrico Mattei,1 - 00144 Roma Capitale sociale Euro 4.005.358.876,00 i.v.

Registro Imprese di Roma, Codice Fiscale 00484960588 Partita IVA 00905811006, R.E.A. Roma n. 756453 Sedi secondarie

Via Emilia, 1 e Piazza Ezio Vanoni, 1 20097 San Donato Milanese (MI)

Published on March 30,2023

Notice of ordinary and extraordinary shareholders' meeting 2023

members of the Board is equal to three, in which case the number of positions shall be rounded down to the next whole number, as indicated by Consob. Slates with a number of candidates for Director equal to or greater than three must include candidates of different genders. Slates seeking to participate in the appointment of the majority of the members of the Board, made up of more than three candidates, must reserve two-fifths of the positions to the less represented gender, rounding up to the next whole number.

If the number of members of the Board is nine, in accordance with the proposal of the Board to the Shareholders' Meeting, the number of members belonging to the less represented gender must be equal to four.

Accordingly, Shareholders who intend to present a slate seeking to participate in the appointment of the majority of the members of the Board shall include three candidates of different gender from that of the other candidates if there are six candidates on the slate, and two candidates of the less represented gender if there are five candidates on the slate. If the Shareholders' Meeting decides that the number of members of the Board shall be fewer than nine, the Directors to be elected shall be drawn from the slates in the progressive order in which they are listed.

With regard to the appointment of the Board of Statutory Auditors, Article 28.2 of the By-laws establishes that two of the positions of standing Statutory Auditor shall be reserved for the less represented gender. Shareholders that intend to submit a slate containing three or more candidates for the positions of standing and alternate Statutory Auditor shall include candidates of different gender in the section for standing Statutory Auditors. If two candidates are indicated in the section for alternate Statutory Auditors, they must be of different genders.

The Board of Directors and the Board of Statutory Auditors have expressed their advice on the composition of the new Board of Directors and Board of Auditors to the Shareholders, which has been made public and will be attached to the report of the Board on the items on the agenda of the Shareholder's Meeting on the items on the agenda of the Shareholder's Meeting. The Corporate Governance Code, which the Company adopts, recommends requiring those presenting a list for the appointment of the Board of Directors that contains a number of candidates greater than half of the members to be elected, to provide adequate information, in the documentation presented for the filing of the slate,

regarding the compliance of the list with the orientation (published in a specific section of the Company's website dedicated to the Shareholders' Meeting) expressed by the Board of Directors, also with reference to the diversity criteria established by principle VII and by the recommendation 8 of the Corporate Governance Code, and to indicate their candidate for the Chairman of the Board of Directors. Shareholders who present a slate for the appointment of the Board of Directors and/or the Board of Statutory Auditors are also invited to ensure that the slate presented is accompanied by all the information necessary to allow Shareholders to consciously express their vote, including the indication of the possible suitability of the candidates for Directors and Statutory Auditors to qualify as independent based on the provisions of recommendation 7 of the Corporate Governance Code. Recall also that pursuant to recommendation 5 of the Corporate Governance Code, independent Directors, pursuant to the Code itself, constitute at least half of the administrative body.

The slates will be made available to the public by April 19, 2023, at the registered office, at Borsa Italiana S.p.A. and on the Company's website.

Furthermore, without prejudice for the provisions of section 4 above, it is recommended (i) to Shareholders who present a slate for the appointment of the Board of Directors and the Board of Statutory Auditors that contains a number of candidates greater than half of the members to be elected, to present and disclose to the market, together with the publication of the slate, the resolution proposals functional to the appointment process, if such proposals have not been formulated by the Directors, in particular concerning the Shareholders' Meeting referred to in this notice, proposals on remuneration and (ii) to all Shareholders to inform the public with appropriate advance notice of any proposal to be submitted to the Shareholders' Meeting concerning issues for which the Directors did not formulate a specific proposal if such Shareholders do not plan to or cannot formulate in advance such proposals pursuant to Article 126-bis of the T.U.F. in order to disclose to other Shareholders for the expression of their vote.

8. Request for information and the website of the Company

Any further information related to the Shareholders' Meeting, in particular concerning the procedures for

5