Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Flir Systems (FLIR) upgraded to Strong Buy from Outperform at Raymond James with analyst Brian Gesuale saying he feels "incrementally positive" about Flir's longer-term option value in AEB systems for auto, an improving margin outlook catalyzed by Defense, and the potential to derive value from the sale of its maritime unit. 2. Boston Beer (SAM) upgraded to Outperform from Neutral at Credit Suisse with analyst Kaumil Gajrawala saying after speaking to a series of category buyers, beer distributors and industry participants, the analyst sees "staying power" of hard seltzer. 3. Jack in the Box (JACK) upgraded to Outperform from Market Perform at Cowen with analyst Andrew Charles saying his checks suggest Tiny Tacos are seeing strong traction that he believes offers greater upside to fiscal Q2 comps than downside to Q1 comps. 4. Calumet (CLMT) upgraded to Market Perform from Underperform at Raymond James with analyst Justin Jenkins saying Calumet has made considerable progress improving its balance sheet and optimizing the asset base in recent years and that while there's "still more wood to chop" on both fronts, he thinks a greater measure of financial stability has been achieved than at any point since lowering his rating to Underperform in early-2016. 5. Core-Mark (CORE) upgraded to Buy from Hold at Jefferies with analyst Christopher Mandeville saying the shares, after falling 30% since the company's Q3 earnings report, more than discount near-term vape headwinds and competitive concerns. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.