NEW YORK (AP) â¿¿ Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and Nasdaq Stock Market: NYSE Chesapeake Energy Corp., down 76 cents at $19.19 A Citi analyst downgraded the natural gas producer's stock saying that a drop in natural gas prices will cut into its value. Procter & Gamble Co., up 97 cents at $66.78 The maker of Crest toothpaste and Gillette razors said that it is raising its quarterly dividend by 7 percent to 56.2 cents. Nasdaq Mattel Inc., down $3.12 at $31.01 The toy maker's first-quarter profit fell 53 percent on costs tied to an acquisition and lower sales for Barbie and Hot Wheels. Endocyte Inc., up $3.82 at $7.62 The biopharmaceutical company said it could get more than $1 billion if a cancer drug developed with Merck & Co. is successful. Halozyme Therapeutics Inc., down $2.72 at $8.56 The drug company and Baxter International Inc. said that regulators will take more time to review their immune disease drug. Merit Medical Systems Inc., up 35 cents at $11.95 A Raymond James analyst upgraded the medical device maker, saying that its new lineup of products should drive revenue growth. Edelman Financial Group Inc., up $2.56 at $8.74 The Houston-based wealth management firm is being taken private by affiliates of Lee Equity Partners LLC for about $257.5 million. Ivanhoe Energy Inc., down 8 cents at 89 cents The government of Mongolia asked for a suspension in activities at SouthGobi Resources, a coal mining company it partially owns.