Corinthian Colleges, King, OfficeMax: U.S. Equity Movers

Shares of the following companies had unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 4 p.m. in New York.

ActivIdentity Corp. (ACTI US) surged 43 percent, the most since at least 2003, to $3.23. The developer of security software to protect online transactions will be bought by Assa Abloy AB, the world’s largest lockmaker, for $162 million, or $3.25 a share, to add digital identity-authentication products.

Corinthian Colleges Inc. (COCO US) slipped 6.8 percent to $5.90, the lowest price since Sept. 15. The for-profit university said President and Chief Operating Officer Matt Ouimet will resign effective Oct. 31. The education company said it had no immediate plans to fill the post. Separately, the university was given a new “neutral” rating at UBS AG by equity analyst Ariel Sokol. The price estimate is $7.

Electronic Arts Inc. (ERTS US) fell 6 percent, the most since Feb. 9, to $16.61. The video-game publisher fell after reviews of its new release “Medal of Honor” were published.

Fastenal Co. (FAST US) declined 5 percent, the most since May 20, to $52.04. The largest U.S. retailer of nuts, bolts and other fasteners said economic weakness could delay its store sales goal by two years.

Global Payments Inc. (GPN US) dropped 8.1 percent, the most since July 28, to $38.90. The provider of card-processing services reported first-quarter earnings excluding some items of 67 cents a shares, missing the average analyst estimate of 69 cents a share.

King Pharmaceuticals Inc. (KG US) surged 39 percent, the most since November 1999, to $14.14. Pfizer Inc. (PFE US) agreed to pay $3.6 billion in cash to buy King, expanding its range of pain treatments to include tamper-resistant medicines.

Motricity Inc. (MOTR US) rose 34 percent, the most since it went public in June, to $17.42. The company that sells software to mobile-phone companies announced an end-to-end mobile service offering that may appeal to customers in emerging markets.

Myriad Genetics Inc. (MYGN US) rose 10 percent, the most since August 2009, to $18.66. The Salt Lake City-based company said its newest molecular diagnostic product, Prolaris, accurately predicts survival with prostate cancer.

OfficeMax Inc. (OMX US) gained 9.3 percent to $15.69, the highest price since June 21. The third-largest U.S. office- supplies retailer could attract potential buyers, JPMorgan wrote in a note to clients, saying the company is undervalued and could be acquired by a private equity.

Office Depot Inc. (ODP US), its competitor, advanced 3.9 percent to $5.02.

RightNow Technologies Inc. (RNOW US) climbed 17 percent, the most since February 2009, to $23.48. The Web-based customer service provider raised its earnings and sales forecasts for the third quarter to more than the average analyst estimates.