The new members are Russian anti-virus software house Kaspersky Labs, the UK engineering software firm Aveva, and Progress Software, a US-based enterprise software provider.
The three join 32 others as BSA policy council members, which together help steer BSA's efforts to support industry growth and promote pro-innovation public policies.
Aveva CEO Richard Longdon said software piracy undermined the company's investment by consuming resource that would be better spent on future technology development.
Founded in 1997, Kaspersky has more than 300 million users worldwide.
Progress Software senior vice-president James Freedman said the firm relied on the BSA's advocacy efforts to eliminate trade barriers and discriminatory procurement practices. "These could harm our ability to remain competitive in the global market place," he said.
Last month the BSA claimed the global software industry had lost $51bn in sales to pirates.
This story was first published by Computer Weekly