It's almost single-handedly the work of cinn--which appears to be a computerized trader (not a true MM). Some aggressive day trader (or, just as likely, a day-trading program) has been using cinn to beat the best bid by hundreths of a penny and then immediately selling the shares by beating the best ask by hundredths of a penny.
The result is that any sell at all lowers the ask, creating an infuriating resistance to any move up. Volume at the ask and only volume at the ask will beat this little bugger. We need help from the company. Looking at INPC's PR history, they are overdue to release one.
It is desperately needed.
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