I would guess MOFI either owns its own plant or uses no more than 2 plants to press their records to exacting specs. The vinyl from MOFI is just too similar in every pressing in weight, touch, feel and playback clarity for it to come from many plants.
"Pressing Vinyl"
Take a few minutes and watch this video regarding the making of LP's from PS Audio September newsletter. Somewhat interesting.
http://vp.nyt.com/video/2015/09/21/34917_1_vinyl-manufacturing_wg_360p.mp4
http://vp.nyt.com/video/2015/09/21/34917_1_vinyl-manufacturing_wg_360p.mp4