BBC Sport previously reported Gold's family had been holding discussions with Staveley's consortium, which also includes her husband Mehrdad Ghodoussi, over a 25% stake in the Championship club.
In a statement, Vanessa Gold said: "I have now reached an agreement to sell my family's shareholding to a consortium led by Amanda Staveley, Mehrdad Ghodoussi and PCP Capital Partners.
"While the process has not yet concluded, I wanted to be open with our fans about where things stand and my intentions."
