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 October 2021

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: October 20, 2021

Eni: Report on the purchase of treasury shares

during the period from 11 to 15 October, 2021

San Donato Milanese (Milan), 20 October 2021 - During the period from 11 to 15 October, 2021, Eni acquired n. 2,223,000 shares, at a weighted average price per share equal to 11.972334 euro, for a total consideration of 26,614,497.84 euro within the authorization to purchase treasury shares approved at Eni’s Ordinary General Meeting of shareholders on 12 May 2021, 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. 15,452,318 treasury shares (equal to 0.43% of the share capital) for an aggregate amount of 170,725,999.49 euro. Following the purchases made until 15 October 2021, considering the treasury shares already held, Eni holds n. 48,497,515 shares equal to 1.35% of the share capital.

Details of the daily transactions are reported below.