Monday's Analysts' Upgrades and Downgrades

CHANGE IN RATINGS

Aflac (AFL Quote) downgraded at Citigroup from Hold to Sell. $55 price target. Market may be too early anticipating a turnaround in Japanese sales.

Altera (ALTR Quote) upgraded at Citigroup from Hold to Buy. $25 price target. Stock has pulled back sharply since the recent earnings call, and the company is still expected to deliver 8% earnings growth in 2008.

Acuity Brands (AYI Quote) upgraded at CIBC from Sector Perform to Outperform. $45 price target, following the ZEP spin-off. Valuation call, as the company could continue to expand margins in the new year.

Chattem (CHTT Quote) upgraded at Wachovia from Market Perform to Outperform. Pullback over the past two weeks has created an attractive buying opportunity. Company can post 20% earnings growth in 2008. ...