Not necessarily true regarding shares sold on the bid. Yesterday there was a stock that was 100% short volume and all buys were at the bid. MM's short to create a market at the ask, at times, and hope to cover at the bid and make money on the difference.
Please research all stocks before investing. My post are my opinions and are not buy or sell recommendations. Always force market makers to cover their shorts above what you paid. Build wealth for fellow iHub'ers!