Research into the 2018 Best Workplaces in Technology, announced today by Great Place to Work and FORTUNE, reveals that tech companies struggling to create an inclusive workplace should foster an environment where each employee can be their own authentic self, regardless of their age, gender, race, or what they do within the organization.

Up to 30 percent of tech workers feel they can’t be themselves at work. That feeling reduces employee innovation, effort, and retention.

Employees at winning cultures are 6x more likely to recruit their friends on behalf of their company. Overall, best workplaces see half the voluntary turnover of peer companies. Employee recommendations and lower turnover help nurture a diverse workplace.

“Many companies offer great experiences such shark tank sessions and hackathons,” said Michael Bush, CEO of Great Place to Work. “But the best tech companies offer meaningful experiences relevant to their organization that resonate with every employee, creating a culture that welcomes all into every program, tapping into the unique genius of every person.”

Great Place to Work surveyed more than 79,000 employees across the information technology industry, assessing 50-plus elements of the workplace. These include trust in managers, compensation, fairness, camaraderie and workplace traits linked to innovation. The ranking accounted for the experiences of all employees including women, people of color, LGBT individuals, older team members and disabled employees.

View the top 40 workplaces at Greatplacetowork.com