Novabase SGPS

Transaction in Own Shares • Dec 5, 2025

Announcement pursuant to articles 5(1) (b) of Regulation (EU) 596/2014 and 2(3) of Commission Delegated Regulation (EU) 2016/1052:

Interim report on the transactions conducted under the share buy-back programme

Lisbon, 5 December 2025

As disclosed to the market in due time, on 19 December 2024, the company Novabase – Sociedade Gestora de Participações Sociais, S.A. ("Novabase" or the "Company") started trading in the context of the own shares buy-back programme (the "Buy-Back Programme") approved on the Board of Directors' meeting held in 19 December 2024, under the authorisation granted in Item Nine of the Agenda of the General Meeting of shareholders of Novabase that took place on 22 June 2024, and in the terms and conditions of the announcement regarding the start of trading under the Buy-Back Programme, disclosed by the Company on the 19 December 2024.

In this context, Novabase informs that, pursuant to articles 5(1)(b) of Regulation (EU) 596/2014 of the European Parliament and of the Council of 16 April 2014 and 2(3) of Commission Delegated Regulation (EU) 2016/1052 of 8 March 2016, as well as pursuant to the CMVM Regulation no. 1/2023, in the period from the 28 November 2025 and 5 December 2025 (inclusively), Caixa – Banco de Investimento, S.A., has acquired shares representing Novabase's share capital, under the Buy-Back Programme and as the financial intermediary in charge of the execution of the programme in Euronext Lisbon's regulated market, as detailed in the table below (aggregated information):

investor.relations@novabase.com

Date of the Transaction	Aggregated Volume (shares)	Weighted Average Price (EUR)	% Share Capital
28/11/2025	-	-	-
01/12/2025	-	-	-
02/12/2025	1,000	8.720	0.003
03/12/2025	200	8.750	0.001
04/12/2025	-	-	-
05/12/2025	-	-	-

On the 5 December 2025, Novabase held, as a result of the transactions indicated herein, an aggregated total of 706,732 own shares, representing 1.84% of the Company's share capital.

Further detailed information on all transactions carried out, under the Buy-Back Programme, in the period from the 28 November 2025 and the 5 December 2025 (inclusively), may be found in the in the documents annexed hereto.

investor.relations@novabase.com

Institucionais

CAIXA BANCO DE INVESTIMENTO

Sessão de: 02/12/2025

SIFOX - Corretores

Emissão: 02/12/2025 16:38:08

Pág: 1/1

CAIXA BI EUR -6,80

Cliente: 419143 / 112507267 - NB - NOVABASE, SGPS, SA Conta de Negociação: 096010580004

Fax: Att:

C/V	Contrata Qtd./Montante	Título Pr.Médio	Tp. Neg. Importância	Dias Juros	Tx.Corr. I.S. Corr	Tx.Bolsa	Outros Encargos		Pr.Unit.Liq.	Vl. Líquido
	Data de Liquidação: 04/12/2025 Moeda: EUR Praça: EURONEXT LISBOA
C	2025120200334 1 000	NOVABASE SGPS N 8,72000000	P 8 720,00	ISIN: PTNBA0AM0006	6,54 0,26	0,00	0,00		-8,72680000	-8 726,80
				N.º de Negócio	Qtd./Mont. Neg.		Preço Neg.	Cotação	Hora Neg.
				3073	700		8,75000000	Vista	15:31:28 640000
				4353	300		8,65000000	Vista	16:20:41 325000
		Total de Compras:	8 720,00		6,54 0,26	0,00	0,00			-8 726,80
				Total da Praça EURONEXT LISBOA:	6,54 0,26	0,00	0,00			-8 726,80
				Total:	6,54 0,26	0,00	0,00			-8 726,80
						Liquidação Financeira
		Banco de Portugal: 04/12/2025 EUR						-8 720,00

Institucionais

CAIXA BANCO DE INVESTIMENTO

Sessão de: 03/12/2025

SIFOX - Corretores

Emissão: 03/12/2025 16:54:41

Pág: 1/1

Cliente: 419143 / 112507267 - NB - NOVABASE, SGPS, SA Conta de Negociação: 096010580004

Fax: Att:

C/V	Contrata	Título	Tp. Neg.
	Qtd./Montante	Pr.Médio	Importância	Dias Juros	Tx.Corr.	I.S. Corr	Tx.Bolsa	Outros Encargos		Pr.Unit.Liq.	Vl. Líquido
	Data de Liquidação: 05/12/2025
	Moeda: EUR
	Praça: EURONEXT LISBOA
C	2025120300118	NOVABASE SGPS N	P	ISIN: PTNBA0AM0006
	200	8,75000000	1 750,00		1,31	0,05	0,00	0,00		-8,75680000	-1 751,36
				N.º de Negócio		Qtd./Mont. Neg.		Preço Neg.	Cotação	Hora Neg.
				3329		133		8,75000000	Vista	09:37:36 651000
				3585		67		8,75000000	Vista	09:37:36 651000
		Total de Compras:	1 750,00		1,31	0,05	0,00	0,00			-1 751,36
				Total da Praça EURONEXT LISBOA:	1,31	0,05	0,00	0,00			-1 751,36
				Total:	1,31	0,05	0,00	0,00			-1 751,36
							Liquidação Financeira
					Banco de Portugal: 05/12/2025				EUR		-1 750,00
						CAIXA BI			EUR		-1,36