Ten-up Option Market – Market Makers provide liquidity and they are members of the exchange. They are required to post a bid and an ask price that is good for 10 option contracts on either side. If you are trying to buy 10 stock options on the offer or sell 10 stock options on the bid and you receive a partial fill, it means that a retail order (not the Market Maker) was on the other side of your option trade.

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