So today, I need to sell my 35k position in COCO at the close. I see using ameritrade's quotescope that there are around 30k shares of COCO at the bid at 4.92. So I put in a limit order to sell 15k shares at the bid. I see all this volume take place at 4.92 ahead of me, and only 5k of my order gets filled. The stock then moves to a 4.90/4.91 bid ask, and I'm forced to sell the rest of my position at 4.90. Does anyone have a good idea of what happened here?