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Why are there hidden bids and offers in the US stock market for the more illiquid stocks?
Certain brokers allow for hidden orders to be placed in the market. It is as simple as that. Refer to Interactive Brokers as one example. If you press on the " i " next to "Hidden" you will get the following description.  Some brokers may represent the hidden orders by an * next to the price level. Sometimes large orders are place as these hidden orders to avoid large movements in the stock price (especially if the stock is illiquid as per your observation).