Welcome to
ACTAR Peers Group

ACTAR Peers Group is a Brazilian cybersecurity company with over 30 years of experience protecting organizations against increasingly complex digital risks.

Throughout our journey, we have evolved alongside the market, keeping pace with technological transformation and anticipating threats that impact businesses, reputations, and critical data.

We believe security is not just technology. It is responsibility. It is strategy. It is continuity. That is why we combine integrity, innovation, specialized technical expertise, and business acumen with the commitment to deliver results that strengthen the security maturity of the organizations we serve and mitigate risks consistently.

More than solutions, we build trust-based relationships grounded in cooperation and transparency. It is people who make the difference every day — professionals who work collaboratively and are driven by the purpose of protecting what matters most to each client.

What We Believe In

Above all else, Integrity.
After integrity, Innovation.
The instrument of innovation, Creativity.
Through innovation, Results.
The consequence of this path, Vanguard.

Our Team

Marcelo Shiramizu

CEO

Over 25 years of consulting experience across industries including retail, education, healthcare, finance, government, and manufacturing. Also served as a civil engineer and health, safety, and environment manager at Cia. Brasileira de Petróleo Ipiranga.

Gustavo Mitt

Management Director

Computer Engineer graduated from ITA, co-founded ACTAR in 1994, focusing on the opportunities that new technologies bring and building lasting relationships with both clients and the internal team.

João Reis

Operations Director

Electrical Engineer with a focus on electronics. I assist clients as a true business partner, sparing no effort to deliver the most appropriate security solution for each organization, always in a transparent and objective manner.

Marcelo Mazoni

Director of Institutional Relations

Computer Engineer graduated from ITA, co-founded ACTAR in 1994, focusing on the opportunities that new technologies bring and building lasting relationships with both clients and the internal team.

Leonardo Spalenza

CISO

Chemical Engineer with a specialization in Telecommunications Engineering. Enjoys exploring new knowledge and the constant challenges that the fields of security and data communications present.

João Netto

Technology Director

With over 25 years of experience in Telecommunications and Information Security, working on highly complex projects in critical environments, and strong analytical skills in code development and planning. I firmly believe that by collaborating directly with strategic leadership, we can make a decisive contribution to achieving positive outcomes for our clients.

Renato Lucas

Sales Director

With 35 years of experience in Telecommunications and Information Security, having witnessed the many changes our market has undergone, I believe a company can only meet the challenges of technological innovation and achieve commercial goals when it invests heavily in organizational excellence and people development.

Our History

1994

ACTAR founded
in Minas Gerais

2003

ACTAR office
opened in São Paulo

10 years

2005

ACTAR opens its office
in Rio de Janeiro and begins
operating on projects across
all of Latin America

2010

With a strong presence in the energy, finance, and telecommunications markets, ACTAR expands operations to Paraná

20 years

2016

ACTAR consolidates itself as
a cybersecurity solutions
provider and positions itself
as an innovation hub.

2023

ACTAR joins Peers Consulting + Technology and expands its service offering in business consulting.

30 years

ACTAR Peers Group continues its pursuit of innovative Cyber Security solutions