This is actually a great question.. Here is the deal. There is PFK-1 and PFK-2. PFK1 is inhibited by citrate and ATP. However, INSULIN greatly stimulates PFK-2 to convert a little fructose 6P to fructose 2,6BP, which activates PFK1.
https://www.reddit.com/r/Mcat/comments/c7zv42/help_pfk_regulation/

