Auxadi, the leading global firm in accounting, tax, payroll, transfer pricing, and corporate legal services, has completed the acquisition of Fidelium. The incorporation of the Belgian firm to Auxadi adds a team of professionals with vast experience in managing accounting and tax services for subsidiaries of large corporations established in Belgium, thus strengthening Auxadi’s value proposition in this territory. 

Fidelium was founded back in 1999 and is based in Brussels. Therefore, this deep knowledge will allow us to optimize and enrich the services offered to our extensive portfolio of multinational clients.  

With this integration, in addition to its 22 existing subsidiaries, Auxadi completes its strategic expansion in the Benelux region, thus consolidating its presence in a key area known for the cooperation among the Netherlands, Belgium, and Luxembourg. 

This new integration strengthens Auxadi’s successful M&A plan, which in 2025 three acquisitions have already been made official: Afiens Legal Services by Auxadi, announced last February, by providing CoSec and incorporations of companies; and TPS by Auxadi, agreed in mid-June, which were joined by the Central American operations in 2021 and the Netherlands in 2023. 

Auxadi’s professional services will improve thanks to its international expansion and its investment in technology. 

Firm overviews 

Auxadi, led by Víctor Salamanca Cuevas since 2009, was founded by Víctor Salamanca Sr. in 1979 in Madrid. Under the leadership of the second generation over the past 15 years, Auxadi has experienced exponential growth, expanding from operations in Spain and Portugal to over 50 countries, with subsidiaries in 22 jurisdictions. Currently, Auxadi serves over 1,300 clients, including multinational corporations and real estate fund subsidiaries. With nearly 300 employees, the firm specializes in becoming the international extension of its clients’ financial departments, leveraging its advanced technology and proven processes. 

Fidelium, founded in 1999 by Dominique Geulette and Lisandro Yelin, is an independent firm composed of professionals with extensive experience in accounting and tax advice in Belgium, where mainly provide services to local subsidiaries of international groups. 

Executive commentary 

Leaders from both organizations share their perspective on this strategic integration and its significance for the future of global services. 

Víctor Salamanca Cuevas, Executive Chairman and CEO of Auxadi, comments: “The strategic selection of our partners is fundamental to ensuring comprehensive support for our multinational clients across all jurisdictions. Following a long period of successful collaboration, we are pleased to announce the acquisition of Fidelium, a move that joins our other acquisitions this year, TPS and Afiens. We are proud to now have offices in Brussels thanks to Fidelium, and we are confident that, together, we will continue to offer the highest quality of service to our clients”. 

Lisandro Yelin, from Fidelium, points out: “Our integration into Auxadi will allow us to continue offering a 360-degree service to multinational groups. Our team’s deep knowledge of the Belgian market, combined with Auxadi’s vast resources and global infrastructure, strengthens our ability to meet our clients’ needs more comprehensively”. 

Dominique Geulette, also from Fidelium, adds: “As partners of Auxadi for years, we have had firsthand knowledge of the firm’s methodology and culture. We are convinced that this acquisition represents a key step for the professional growth of our team and for the continued excellence in the service we provide”. 

About Auxadi 

With subsidiaries in 22 countries across Europe, the United States, and LATAM, Auxadi is today the leading Spanish accounting firm providing services to multinationals and real estate funds. Thanks to its technology and a culture focused on client satisfaction, Auxadi becomes an extension of its clients’ international accounting, tax, and payroll departments, including services for accounting, tax, payroll, transfer pricing, and Corporate Legal. Its technological platform, MySPV, along with its more than 300 employees and 1,500 clients, makes it a benchmark in the tech-enabled services sector not only in Spain, but internationally. 

About Fidelium 

Founded in 1999, Fidelium is an independent firm composed of professionals who specialize in the accounting and tax administration of international groups located in Belgium. Its role has been to support companies in the full development of their business, aiding in all areas and regions of the country.