Indra Nooyi, who stepped down as CEO of PepsiCo (PEP - Get Report) in October 2018 after 24 years, was elected to join Amazon.com's  (AMZN - Get Report) board, while Nikki Haley, President Trump's former U.S. Ambassador to the United Nations, was nominated Tuesday to Boeing's (BA - Get Report) board.

Haley resigned from the administration in December.

According to the Missing Pieces Report, a multiyear study published by the Alliance for Board Diversity along with Deloitte, there has been a slow and steady increase in women and minorities on the boards of some of the largest public companies in the United States. In 2018, there were 38.6% women and minorities on the boards of Fortune 100 companies, up from 35.9% in 2016. There were 34% women and minorities on Fortune 500 boards in 2018 vs. 30.8% in 2016.

"At the current rate of progress, we predict that we would see the number of women and minorities increased to 40% (a target percentage set by the Alliance for Board Diversity) by year 2024," the report stated.