Normally I'd watch to see who is the AX market maker and who is the handle market maker.
These are the 2 which handle the most volume traded in the stock your interested in. The AX, or lead M&M and HANDLE, second M&M; often determine price direction by how they stack the bid / ask. And you also find them switch day by day. But there is always a first and second in the monthly figures. And they are the main ones to watch during the day.
You can find out who's involved with the stock you have interest in by entering the symbol here. Click ALL OTC, then rank, and look at MP volume or % volume.
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