By Christopher Bjork 

MADRID--Spanish information technology company Indra Sistemas SA announced the resignation Thursday of its long-standing executive chairman, Javier Monzón, after the board of directors stripped him of his executive duties.

Fernando Abril-Martorell, a former executive of several large Spanish companies including Telefónica SA, was named to replace him.

The move followed a period of sweeping changes in the shareholder structure of the company, whose products include air traffic control systems, flight simulators and cybersecurity technology.

Spanish telecommunications giant Telefónica SA disclosed Wednesday that it had bought a 3% stake in Indra and held an option for an additional 3%. That deal was preceded by the Spanish state's 2013 purchase of 20% of Indra.

Mr. Monzón was one of Spain's longest-serving top executives, having led Indra for 22 years.

Mr. Abril-Martorell last served as chief executive of media group Promotora de Informaciones SA, publisher of the newspaper El País. Before that, he led the Spanish office of investment bank Credit Suisse.

Write to Christopher Bjork at christopher.bjork@wsj.com

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