Among the companies with shares expected to actively trade in Monday's session are Cognizant Techology Solutions Corp. (CTSH), RadioShack Corp. (RSH) and Microsoft Corp. (MSFT).

Cognizant said Monday it agreed to buy closely held TriZetto Corp. for $2.7 billion in cash, as it looks to capitalize on shifts in health-care information technology driven by regulatory reform. Shares rose 1.7% to $45.50 in premarket trading.

RadioShack appointed Holly F. Etlin as interim chief financial officer, replacing John Feray, who resigned effective Friday. Mr. Feray's departure is the latest in a series of executive changes as the retailer faces a possible bankruptcy filing. Shares jumped 19.8% to $1.09 premarket.

Microsoft reached an agreement to acquire Mojang, the Swedish company behind the popular "Minecraft" videogame, for $2.5 billion. Shares were down slightly to $46.65 premarket.

Terex Corp. (TEX) lowered its full-year per-share earnings outlook and provided third-quarter guidance that missed Wall Street's views on weaker-than-expected demand in its cranes business. Shares fell 8.5% to $31.75 premarket.

Bankrate Inc. (RATE) said Chief Financial Officer Edward DiMaria "has resigned" and the company named Steven Barnhart as interim CFO. The company also said the Securities and Exchange Commission has begun an investigation related to its 2012 financial reporting. Shares were inactive premarket.

Apple Inc. (AAPL) said Monday it had more than four million preorders of its new iPhone 6 and iPhone 6 Plus in the first 24 hours, a figure the company dubbed a record. Shares gained 1.4% to $103.05 premarket.

Gilead Sciences Inc. (GILD) said Monday it will allow generic drug makers to make cheaper versions of its hepatitis C pill, Sovaldi, to sell in developing countries. Indian drug makers including Ranbaxy Laboratories Ltd. (5000359.BY) and Cipla Ltd. (500087.BY), as well as Pennsylvania-based Mylan Inc. (MYL) received licenses to produce Sovaldi. Gilead's shares fell 1.4% to $102.17 premarket. Mylan's shares were up 2.1% to $48.06.

Danaher Corp. (DHR) agreed to buy Switzerland-based dental implant maker Nobel Biocare Holding AG in a $2.2 billion cash deal. Shares were inactive premarket.

Nucor Corp. (NUE) agreed to acquire Gallatin Steel Co. for about $770 million.

Office Depot Inc. (ODP) said it will transfer its stock listing to the Nasdaq Global Select Market from the New York Stock Exchange later this month.

Avanir Pharmaceuticals Inc. (AVNR) announced positive results from its Phase II clinical trial evaluating the safety and efficacy of AVP-923 for the treatment of agitation in patients with Alzheimer's disease.

 
   Watchlist: 
 

Seagate Technology Inc. (STX) raised its revenue expectations for its fiscal first quarter on Friday as the data-storage company experiences broad-based growth across all of its segments. Seagate is now projecting revenue of $3.65 billion for the quarter, up from the $3.55 billion it had previously expected.

NPS Pharmaceuticals Inc. (NPSP) said Friday a U.S. Food and Drug Administration panel has recommended the company's experimental hormone drug for approval, a key step in getting the drug approved by the agency. The drug, Natpara, is used to treat hypoparathyroidism.

More than half of the Boeing Co. (BA) machinists at the company's St. Louis fighter-jet plant have signed up to take voluntary buyouts, union leaders said Friday. The International Association of Machinists and Aerospace Workers said 1,317 of its 2,300 members at the factory had registered with the company by a July 31 deadline to take the voluntary buyout offer.

Cisco Systems Inc. (CSCO) said Marc Benioff, chairman and chief executive of Salesforce.com Inc. (CRM), will step down from Cisco's board of directors in November.

 
   Barron's Watchlist: 
 

As American Express Co. (AXP) expands its franchise, profits could rise at a double-digit rate, lifting the stock nearly 30%, according to an article in Barron's.

Write to Tom Rojas at tom.rojas@wsj.com and Josh Beckerman at josh.beckerman@wsj.com

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