Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Coach (COH) upgraded to Outperform from Neutral at Baird with analyst Mark Altschwager saying his firm's third quarter handbag survey points to stronger purchase intent for the brand, especially in the outlet channel. 2. Teva (TEVA) upgraded to Buy from Hold at HSBC with analyst Steve McGarry saying the "imminent" closing of the Allergan (AGN) generic deal removes uncertainty and could be a catalyst for the shares. 3. Groupon (GRPN) upgraded to Overweight from Neutral at Piper Jaffray with analyst Samuel Kemp saying new management's market spend will drive customer acquisition. 4. Humana (HUM) upgraded to Buy from Hold at Jefferies saying he believes the acquisition by Aetna (AET) is likely to go through. 5. Toll Brothers (TOL) upgraded to Buy from Neutral at Buckingham with the firm citing recent underperformance versus peers. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.

Bullish option flow detected in Groupon with 8,232 calls trading, 3x expected, and implied vol increasing over 2 points to 117.96%. Jun-24 12 calls and May-24 13 calls are the most active options, with total volume in those strikes near 4,100 contracts. The Put/Call Ratio is 0.02. Earnings are expected on May 8th.

Bullish option flow detected in Groupon with 5,357 calls trading, 1.6x expected, and implied vol increasing almost 4 points to 115.04%. May-24 9 puts and Apr-24 11 calls are the most active options, with total volume in those strikes near 4,500 contracts. The Put/Call Ratio is 0.61. Earnings are expected on May 8th.