From Raheem Mostert’s agent, Brett Tessler:

Despite strong interest elsewhere, restricted free agent RB Raheem Mostert just agreed to a three-year deal with the San Francisco 49ers... Wanted to continue building on what he started there. Thanks to John Lynch, Kyle Shanahan, and Paraag Marathe for the opportunity!

Mostert is a speedy guy that is an excellent special-teamer. One of the best in the game. That is the fourth commitment to a running back this year. They all have one thing in common: They are fast.