Unusual high volume, page-4

I took two screenshots before and after the big trades were executed. I was amazed by the volume that came online as soon as the market is about to close. I usually see such transaction when options expire but today wasn't an option expiry day. it's usually on the third Thursday of every month. I know it's a couple of big transaction between parties who use the same or similar brokers but will wait and see if there's changes in ownership or changes in short positions