NEW YORK ( TheStreet) -- CHANGE IN RATINGSAllison Transmission ( ALSN) was initiated with a Hold rating at Keybanc. End-market demand appears to be slowing, Keybanc said. Autozone ( AZO) was upgraded at JP Morgan to Overweight. Previous investments should drive solid sales growth, and management is keeping a tight lid on costs, JP Morgan said. Big Lots ( BIG) was downgraded at Deutsche Bank from Buy to Hold. $34 price target. Company is seeing slower sales growth, Deutsche said. Chipotle Mexican Grill ( CMG) was downgraded at Credit Suisse from Outperform to Neutral. Valuation call, based on a $450 price target, Credit Suisse said. Diebold ( DBD) was upgraded at Compass Point to Buy. $45 price target. Stock is attractive, following a 6% pullback, Compass Point said. Dolan ( DM) was downgraded to Hold at TheStreet Ratings. Brinker ( EAT) was upgraded at Sterne Agee from Underperform to Neutral. Turnaround is starting to show in the company's increased traffic, Sterne Agee said. Fortinet ( FTNT) was upgraded at Nomura from Neutral to Buy. $32 price target. Company has secular tailwinds and recent reseller checks were strong, Nomura said. Hexcel ( HXL) was upgraded at Wedbush from Neutral to Outperform. $32 price target. Margin improvement should be sustainable, Wedbush said. Netflix ( NFLX) was upgraded at Pacific Crest to Outperform. $130 price target. Company is leveraged to stronger video and secular growth trends, Pacific Crest said. O'Reilly Automotive ( ORLY) was upgraded at JP Morgan to Neutral. Company should see seasonally strong sales during the summer, JP Morgan said. Roper ( ROP) was downgraded at Baird from Outperform to Neutral. $105 price target. Company trades at a 40% premium to its peers, Baird said. Charles Schwab ( SCHW) was downgraded at Stifel Nicolaus from Buy to Hold. Valuation call, Stifel Nicolaus said. SunTrust Banks ( STI) was upgraded to Buy at TheStreet Ratings. Synaptics ( SYNA) was upgraded at Sterne Agee from Neutral to Buy. $38 price target. Company is leveraged to higher Kindle Fire growth, Sterne Agee said. Tyson Foods ( TSN) was upgraded at BMO Capital from Market Perform to Outperform. $22 price target. Market has likely overreacted to weak beef and pork margins, BMO Capital said. Ultimate Software ( ULTI) was upgraded at Piper Jaffray from Underweight to Neutral. $65 price target. Business should accelerate in the second half of the year, Piper Jaffray said.