Among the stock activity stories for Wednesday, Feb. 20, from the AP Financial Desk:

NEW YORK (AP) — Shares of Visteon Corp. hit a new 52-week high Wednesday after a J.P. Morgan analyst upgraded the auto supplier, saying that its shares are poised for gains.

NEW YORK (AP) — Drilling contractor Nabors Industries' stock fell sharply on Wednesday as fourth-quarter results disappointed Wall Street and the company warned that its first-quarter income will drop because of a low rig count and depressed spot market rates.

NEW YORK (AP) — Shares of Radian Group Inc. rose Wednesday after a Susquehanna analyst upgraded the mortgage insurer's stock, saying its is poised to double as the housing market continues to improve.