CHANGE IN RATINGS

Atlantic Tele-Networks ( ATNI) downgraded at UBS to Neutral rating from Buy. However, price target lifts to $40 from $35 and FY2008 EPS estimates bump to $2.09 from $2.06.

BigBand Networks ( BBND) downgraded at Jefferies to Hold rating from Buy. Price target slashed to $7 from $16.50 and FY2008 EPS estimates drop to $0.30 from $0.50.

Cullen/Frost Bankers ( CFR) upgraded at Keefe, Bruyette & Woods to Outperform. Estimates cut because of the interest rate cut, but the company has a solid balance sheet and the stock appears inexpensive.

Chipotle ( CMG) downgraded at Citigroup from Buy to Hold. Valuation call, based on a $120 price target. Even so, estimates are also being raised as the company's fundamental growth strategy continues to be successful.

Conseco ( CNO) upgraded at Friedman, Billings Ramsey to Outperform. $19 price target. Estimates also raised, based on management's call for lower LTC losses.

Cognos ( COGN) upgraded at Goldman Sachs to Buy from Neutral based on improved outlook, business momentum and cost controls. Note valuation below peers. Price target pushed to $48 from $42.

CRA International ( CRAI) upgraded at William Blair from Market Perform to Outperform. Valuation call, even after the company posted disappointing earnings last quarter.

First Horizon ( FHN) downgraded at Keefe, Bruyette & Woods from Market Perform to Underperform. Estimates also cut, as the company is struggling to cut costs fast enough to weather the current credit crunch. $23 price target.

Harman International ( HAR) upgraded at Bear Stearns from Peer Perform to Outperform. $107 price target. Valuation call, plus the company has a record backlog.

Spectra Energy ( SE) downgraded at Jefferies to Hold rating from Buy. Price target dips to $26 from $27.50 and FY2008 EPS estimates hold at $1.60.

Target ( TGT) upgraded at Merrill Lynch to Buy. $77 price target. Company will likely sell its credit portfolio in a manner that adds to earnings.

Ultra Petroleum ( UPL) initiated at Morgan Stanley with an overweight rating and a $72 price target.

V ertex Pharma ( VRTX) downgraded at Merrill Lynch to Neutral. Market has high expectations ahead of the upcoming AASLD conference, though uncertainty remains about the data.

STOCK COMMENTS / EPS CHANGES

Jabil Circuit ( JBL) 2008 estimates raised at Credit Suisse to $1.33 from $1.21 after company reported solid FQ4 results and guidance. Cites future restruction and new program wins as possible long-term catalysts. Maintained Outperform rating.

Rite Aid ( RAD) 2008 estimates cut at Goldman to $0.10 from $0.17 due to sluggish business and lower expectations for sales and EBITDA going forward. Target lowered to $5 from $5.45. Maintained Sell rating.

Molson Coors ( TAP) 2007 estimates raised at Goldman to $5.29 from $5.23. Stronger Canadian dollar supports bullish stance and view that company can deliver a step-up in free cash flow in 2008 and beyond. Maintained Buy rating and raised price target to $110 from $105.