The most talked about and market moving research calls around Wall Street are now in one place. Here are today's research calls that investors need to know, as compiled by The Fly.Top 5 Upgrades: Wolfe Research upgraded Inspire Medical (INSP) to Outperform from Peer Perform with an $180 price target. The firm says the "surprise" 50% Medicare reimbursement raise "pumps oxygen" into the stock's bull case.UBS upgraded Cummins (CMI) to Neutral from Sell with a price target of $500, up from $350. The truck cycl ...