It was the third year Alcoa employees took part in the event with Alcoa being the first resources company to march in the parade.

Environment, Health and Safety Director Danny Spadaccini marched for the first time this year and is committed to embedding equality, inclusiveness and diversity into workplace standards, behaviours and programs.

"As an employer of nearly 4000 Western Australians we have a responsibility to provide an inclusive, safe and supportive environment for every employee," he said.

"We have strong views on a worker's right to be their authentic self at work so they do not have to hide who they are from their co-workers."

As part of Alcoa's commitment to diversity, it has several employee affiliation groups including EAGLE - Employees at Alcoa for Gay, Lesbian, Bisexual and Transgender Equality.

"We understand people can be challenged by being LGBTI and in the minority, so for employees identifying as LGBTI or who are allies of a LGBTI person they can access our EAGLE support group to share their challenges and concerns in a considerate environment," Spadaccini said.

"We hope by joining the Pride Parade we grow acceptance of community differences and diversity and promote Alcoa as a great, inclusive place to work."