Among the companies with shares expected to actively trade in Tuesday's session are Best Buy Co. (BBY), Urban Outfitters Inc. (URBN) and American Woodmark Corp. (AMWD).

Best Buy's fiscal second-quarter profit slumped 91% as the big-box consumer-electronics retailer logged a restructuring charge and saw same-store sales continue to decline, pushing results well below expectations.

Urban Outfitters's fiscal second-quarter earnings rose 8.1% as the youth-focused apparel retailer continued to report top-line growth. Shares were up 16% at $36.22 premarket as the results beat expectations.

Cabinet and vanity maker American Woodmark swung to a surprise fiscal first-quarter profit, helped by strong demand from new-construction customers. Shares surged 15% to $20.99 premarket.

Tech Data Corp.'s (TECD) fiscal second-quarter earnings fell 31% as the wholesale distributor of information-technology products saw its sales take a hit from weakening foreign currencies and a change in how certain contracts are reported. Shares slumped 8% to $47.99 premarket.

Nordson Corp.'s (NDSN) fiscal third-quarter earnings rose 18%, with organic volume and backlog rising sharply for the maker of dispensing equipment, though higher expenses continued to pressure margins. Shares jumped 15% premarket to $62.99 as the company predicted stronger-than-expected current-quarter results and beat its already-upbeat third-quarter revenue guidance.

Yellow-page companies Dex One Corp. (DEXO) and SuperMedia Inc. (SPMD) have agreed to merge in an all-stock deal. The yellow pages business, like the newspaper industry, hasn't benefited from a broader advertising recovery as more consumers and ad dollars migrate to the web, causing an accelerated decline for the industry over the past few years. Shares of Dex One surged 31% to $1.62 in recent premarket trading, while shares of SuperMedia were inactive from a Monday close at $2.58.

Israel-based drug developer Pluristem Therapeutics Inc. (PSTI) said it has renewed a five-year partnership with a German research institution, a collaboration Chief Executive Zami Aberman said has been highly supportive of its product pipeline. Shares jumped 5.5% to $4.22 premarket.

Daktronics Inc.'s (DAKT) fiscal first-quarter earnings jumped a bigger-than-expected 98% as the maker of larger-screen electronic displays saw a 29% rise in orders in the Live Events business, driven by projects across both college and professional facilities. Shares were up 16% to $9.50 premarket.

   Watchlist:

Ameren Missouri, a subsidiary of Ameren Corp. (AEE), intends to buy back as much as $377 million in senior notes, and also plans to issue new debt, in a refinancing effort.

Church & Dwight Co. (CHD) has agreed to acquire Avid Health Inc. for $650 million in cash as it seeks to benefit from growing sales of gummy vitamins.

DreamWorks Animation SKG Inc. (DWA) has inked a agreement with News Corp.'s (NWSA, NWS) Twentieth Century Fox for the distribution of its animated movies, ending a period of shopping around as its current arrangement is set to expire.

A lawsuit filed on behalf of customers of major online travel sites and hotel operators accuses the companies, including Expedia Inc. (EXPE) and Marriott International Inc. (MAR), of conspiring to fix prices.

ImmunoCellular Therapeutics Ltd.'s (IMUC) president and chief executive, Manish Singh, has resigned and the company's chief scientific officer and chairman, John S. Yu, will take on the roles on an interim basis until a permanent successor is selected.

Trina Solar Ltd. (TSL) swung to a second-quarter loss as the Chinese solar-products maker continued to struggle under lower selling prices, along with overdue balances from customers. The company also lowered its shipment guidance for the year.

VirnetX Holding Corp. (VHC) said it will refile its complaint with the U.S. International Trade Commission after the ITC terminated an investigation into the company's allegations that Apple Inc. (AAPL) engaged in unfair-trade practices.

-Write to Mia Lamar at mia.lamar@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires