CSTI is retail. IF I had to guess: Ameritrade. L2 & lot size shows what I'm posting to be FACT:
1) CSTI has been INCREASING their ASK SIZE 2) Commensurate with BID ACCUMULATION (over time) 3) ONLY retail puts HUGE orders in; likely to avoid multiple trading fees 4) CSTI has been using this strategy to ACCUMULATE for a LONG TIME; as anyone observing L2 may note 5) See #1
IF CSTI wanted to sell you DO NOT bury your order 5 Market Makers deep!!! And, IF YOU ARE NOT RETAIL, you have NO REASON to show such large orders. This is RETAIL,...&, as I said; likely TDAmeritrade.