NEW YORK (CNNMoney.com) -- The following are some of Thursday's most actively traded stocks:
Amgen (up $2.97 to $62.98, Charts, Fortune 500) said its anemia drug Aranesp showed no increased risk of death compared to a placebo in a study of small-cell lung cancer patients undergoing chemotherapy.
Briggs & Stratton (down $3.06 to $28.74, Charts) reported earnings that fell sharply in the wake of a mild U.S. hurricane season, and the company cut its profit forecast for the year.
Continental Airlines (down $1.36 to $42.38, Charts, Fortune 500) posted a higher-than-expected first quarter profit helped by fuller planes, higher fares and a slight decline in fuel prices.
Harley-Davidson (up $2.44 to $63.70, Charts, Fortune 500) reported better-than-expected results despite a strike at a key plant.
Southwest Airlines Co. (down $0.01 to $15.65, Charts, Fortune 500) posted higher first-quarter earnings despite higher jet fuel costs.
Marriott (down $3.68 to $48.19, Charts, Fortune 500) reported a quarterly profit that nearly tripled, helped by higher room rates, but the company lowered its outlook for full-year room revenue.
Altria Group (down $0.71 to $69.37, Charts, Fortune 500) posted quarterly earnings below analysts' forecasts due to weakness at its Phillip Morris USA tobacco business.
Nokia Corp. (up $0.84 to $24.71, Charts) reported a robust profit margin for the first quarter helped by buoyant emerging market demand, pushing its shares to a 12-month high.
New York Times Company (down $0.52 to $24.04, Charts) said its first-quarter profit fell 26 percent, hurt by weakness in print advertising and various charges.
Playtex Products (up $1.53 to $15.06, Charts) said Thursday it has acquired the owner of the Hawaiian Tropic sun care line, Tiki Hut Holding, expanding its sun care lineup ahead of the summer season.
Schering-Plough Corporation (up $2.49 to $31.04, Charts, Fortune 500) posted a 55 percent rise in first-quarter earnings, beating analysts' expectations on higher sales of its prescription drugs, including two cholesterol fighters sold in partnership with Merck & Co.
Unitedhealth Group (down $2.08 to $52.13, Charts, Fortune 500) said its first-quarter profit rose 4 percent, but the results were hampered by payments related to its stock options problems.
Vonage (down $0.09 to $3.02, Charts) disclosed in an SEC filing that its litigation with Verizon could force it into bankruptcy.
Wyeth (Charts, Fortune 500) said earnings rose a better-than-expected 12 percent on strong sales of its vaccine against childhood infections, and it reported positive trial results for its experimental drug Pristiq.