Among the companies with shares expected to actively trade in Tuesday's session are A. Schulman Inc. (SHLM), Citigroup Inc. (C) and Gigamon Inc. (GIMO).

A. Schulman's fiscal second-quarter earnings fell 42%, though adjusted results topped market expectations as the company said its European segment is showing signs of improvement. The company again lifted its earnings view for the fiscal year, pushing shares up 6.4% to $38.66 in light premarket trading.

Citigroup agreed to pay $1.12 billion to 18 investors seeking to recover losses from mortgage-based securities sold before the financial crisis, according to a news release from the bank. Shares dropped five cents to $46.50 premarket.

Shares of Gigamon slipped 22% to $20.45 premarket after the networking-hardware company trimmed revenue expectations for the latest quarter, saying one large transaction from a customer abroad didn't materialize.

Appalachian coal miner James River Coal Co. (JRCC) filed for Chapter 11 bankruptcy protection Monday as it continues its search for a buyer or investor. Shares dropped 52% to 34 cents premarket.

 
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Abercrombie & Fitch Co. (ANF) disclosed details of changes to stock awards for the teen retailer's senior executive team, as the company tries to align executive compensation with its goal of improving returns to stockholders amid pressure from an activist investor.

Bank of New York Mellon Corp. (BK) boosted its quarterly dividend by 13%, the second shareholder-friendly action the bank has announced since passing the Federal Reserve's annual "stress test."

Baidu Inc.' s (BIDU) Qunar travel website is in discussions to tie-up with Ctrip.com International Ltd. (CTRP), Bloomberg reported Tuesday, citing two people with direct knowledge of the talks. A range of possibilities including a full merger to a partnership are under discussion, these people said, adding that talks are still at an early stage.

Gastar Exploration Inc. (GST) on Monday said production in the Marcellus Shale in West Virginia had been halted since early Saturday due to a pipeline rupture.

Intel Corp. (INTC) unveiled a series of changes to how it will report results for its operating segments, including breaking out results associated with a technology trend called the Internet of Things.

Tesla Motors Inc. (TSLA) said it has started offering a business leasing program for its small and medium business customers, providing another financing option for its electric cars. Tesla has created a few financing plans to help customers pay for or lease its Model S cars, which have a cash price of between $69,900 to $93,400, before federal or state incentives, according to the company's website.

US Ecology Inc. (ECOL) has agreed to buy waste-management firm Environmental Quality Co., or EQ, for $465 million. US Ecology, which provides radioactive, hazardous and industrial waste management and recycling services, said it expects the deal to broaden its geographical footprint beyond its predominantly western U.S. territory and to add to adjusted earnings this year.

Zogenix Inc. (ZGNX) is seeking a temporary restraining order to block a recent executive order by Massachusetts Gov. Deval Patrick that bans the sale in the state of its drug Zohydro, an extended-release version of the narcotic painkiller hydrocodone.

Write to John Kell at john.kell@wsj.com and Lauren Pollock at lauren.pollock@wsj.com

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