Nearly half of millennials, 43%, plan to actively look for a new job in 2015, according to the study, “Inside the Employee Mindset,” released by Aon Hewitt. The study defined millennials as those born between 1979 and 1996.

“It’s not surprising that employees in their mid-20s and 30s are more likely to job hop as they look to advance their careers and improve their pay and benefits,” said Ray Baumruk, employee research leader, Aon Hewitt. “However, our research shows there is a clear disconnect between what millennials expect and desire from employers, and what their employers are actually offering. This gap is negatively impacting the engagement and retention of this generation, and may be one of the primary reasons why millennials will be looking for new opportunities in 2015.”

When asked to rank what specific areas they would most like to see improved in their current workplace to increase their overall engagement or satisfaction, the top responses among millennials were:

• Pay and benefits: 51 percent
• Good career or development opportunities: 39 percent
• Performance recognition: 38 percent
• Open/complete communication: 34 percent
• Flexible work environment: 33 percent
• Fun: 30 percent
• Having a strong management and leadership team: 30 percent

The Aon Hewitt data comes from a survey administered by The Futures Company online within the US in August 2014. It included 2,539 employees working in companies with at least 1,000 people.