Washington, D.C. 20549

Form 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of June 2022

Eni S.p.A.

(Exact name of Registrant as specified in its charter)

Piazzale Enrico Mattei 1 -- 00144 Rome, Italy

(Address of principal executive offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F x Form 40-F ¨

(Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2b under the Securities Exchange Act of 1934.)

Yes ¨ No x

(If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):            )

Table of contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorised.

Date: June 15, 2022

Eni: Report on the purchase of treasury shares

during the period from June 6 to June 10, 2022

San Donato Milanese (Milan), 15 June 2022 - During the period from June 6 to June 10, 2022, Eni acquired n. 3,103,847 shares, at a weighted average price per share equal to 14.1794 euro, for a total consideration of 44,010,579.56 euro within the authorization to purchase treasury shares approved at Eni's Shareholders' Meeting on 11 May 2022, previously subject to disclosure pursuant to art. 144-bis of Consob Regulation 11971/1999.

On the basis of the information provided by the intermediary appointed to make the purchases, the following are details of transactions for the purchase of treasury shares on the Electronic Stock Market on a daily basis:

Since the start of the programme, Eni purchased n. 6,222,400 treasury shares (equal to 0.17% of the share capital) for an aggregate amount of 88,181,302 euro.

Following the purchases made until 10 June 2022, considering the treasury shares already held and the cancellation of 34,106,871 treasury shares resolved by Eni's Shareholders' Meeting of 11 May 2022, Eni holds n. 37,953,702 shares equal to 1.06% of the share capital.

Details of the daily transactions are reported below.