Mills Estruturas e Serviços de Engenharia S A : Notice to the Market - Acquisition of Nest Rental´s control

Press Release

Mills Estruturas e Serviços de Engenharia S/A

CNPJ/MF: 27.093.558/0001-15

NIRE: 33.3.00289.74-7

Public Held Company

Acquisition of Nest Rental´s control

Mills Estruturas e Serviços de Engenharia S.A. ("Mills" ou "Companhia") inform its shareholders and the market in general that, on April 28, 2021, its subsidiary, Solaris

Equipamentos e Serviços S.A. ("Solaris"), has entered into an investment agreement, quota purchase andB3:MILS3sale agreement and other covenants to acquire 51% (fifty one percent) of the quotas of the capital stock of Nest Locação e Revenda de Máquinas Ltda., a limited company enrolled

with the CNPJ/ME under no. 30.224.282/0001-71, with head offices at São Paulo city, São Paulo state, under Av. Roque Petroni Junior, no. 1226 - Jardim das Acácias, CEP 04707-000 ("Nest Rental" or "Empresa") ("Operação").

Nest Rental was founded in 2018 and operates in the Low Level Access Platform Rental segment (up to 6 meters height), offering compact, light equipment, easy to transport, simple maintenance and that replace stairs with greater safety and productivity, thus presenting excellent capacity to become increasingly present in the daily lives of people and companies. Nest Rental has exclusivity from JLG in the supply of this equipment in Brazil and has a business model that can be accelerated through the web, in addition to online sales and sharing stations for equipment rental, which demonstrates Nest Rental's vocation for innovation in the sector.

Thus, in addition to increasing the focus on this family of equipment, Mills also seeks with the operation to strengthen initiatives related to digital transformation, with Nest Rental as a lever of innovation, through which it will foster the evolution of processes, automated solutions and the implementation of new facilities for customers, aiming to increasingly improve their rental experience.

Nest Rental currently has a fleet with 115 equipment and an estimated gross revenue for 2021 of approximately R$ 4 million. In order to reach Nest Rental's control, Solaris will disburse R$

5.1 million, of which R$ 3 million will be invested in the company its growth. In 2025, if it is in the interest of the Company, Solaris may acquire the other 49% interest at a predetermined valuation of Nest Rental of 6.25x Adjusted Ebitda (excluding non-recurring items and the effects of IFRS 16) of 2024.

The acquisition by Solaris is in line with Mills' strategy of seeking to concentrate the non-core business in this subsidiary. The company informs that this transaction does not constitute a hypothesis provided for in Art. 256, of the Lei das S.A., from 1976.

Rio de Janeiro, April 29, 2021.

James Oliver Guerreiro Carneiro

Chief Financial Officer & Investor Relations