Among the companies with shares expected to actively trade in Tuesday's session are Navistar International Corp. (NAV) and Salix Pharmaceuticals Ltd. (SLXP) .

Navistar said its loss narrowed in its October quarter, but the truck maker's bottom line fell short of Wall Street's expectations for a profit. Shares fell 8.4% to $32.10 premarket.

Salix said it plans to clear out its wholesaler inventory, just months after a potential takeover by Botox-maker Allergan Inc. stalled on concerns over Salix's high inventory levels. Salix also withdrew its guidance for its current quarter and year, citing impacts from the inventory plan. Shares rose 4.7% to $107.90 premarket.

Amazon.com Inc. (AMZN) is extending its deadlines for customers to place orders if they want their packages before Christmas day to as late as 11:59 p.m. EST on Dec. 19, giving customers one more day than last year. The latest Prime members can place orders is Dec. 22. Last week Wal-Mart Stores Inc. said it would still guarantee Christmas Eve delivery for packages sent by standard shipping and ordered by Dec. 19. Amazon shares fell $1.67 to $304.40 premarket.

Boeing Co. (BA) said its board authorized the repurchase of $12 billion of the aerospace and defense company's shares over the next two to three years and raised its quarterly dividend by 25%. Shares rose 2% to $124.50 premarket.

Crocs Inc. (CROX) has appointed Gregg Ribatt, formerly of Spanx Inc. and Collective Brands, chief executive of the footwear company, which is downsizing as its plastic clogs have fallen out of fashion. Shares rose 6% to $12.89 premarket.

CVS Health Corp. (CVS) projected up to 16% earnings growth for the next year, driven by gains in specialty drugs and acquisitions. The drugstore chain also approved a new $10 billion stock repurchase program and boosted its quarterly dividend by 27%. Shares rose 1.3% to $91 premarket.

Pharmacy-benefit manager Express Scripts Holding Co. (ESRX) has named an executive of a beverage distributor executive as its interim chief financial officer. Shares fell 2.5% to $80.74 premarket.

FactSet Research Systems Inc. (FDS) said strong growth in its client base across geographic regions helped profit in the November quarter, offsetting a 10% jump in operating costs that came partly from the addition of new employees. Shares rose 4.7% to $141.50 premarket.

FedEx Corp. (FDX) has agreed to buy logistics provider Genco, which has revenue of about $1.6 billion. Shares fell 27 cents to $176 premarket.

Jefferies Group LLC said it is considering strategic options for the commodities and financial-derivatives unit it bought from Prudential Financial Inc. (PRU) in 2011. The unit of Leucadia National Corp. (LUK) while also reported that volatility and a tepid trading environment dragged down results in its quarter ended November. Leucadia shares fell 1.7% to $21.20 premarket.

Activist shareholder Jana Partners LLC dropped plans to nominate a slate of candidates to the board of PetSmart Inc. (PETM) in light of the pet-supply retailer's deal to be acquired. PetSmart shares fell two cents to $80.95 premarket.

VeriFone Systems Inc. (PAY) swung to a fourth-quarter profit on higher revenue as the electronic-payment company continues to move away from its traditional electronic payment terminals. Shares fell by a penny to $33.05 premarket.

Whirlpool Corp. (WHR) cut its financial forecast for the year and offered a weak forecast for 2015, citing integration costs related to recent acquisitions. Shares fell 2.2% to $179.25 premarket.

 
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Actavis PLC (ACT) unveiled its planned management structure for the company after it closes its acquisition of Botox maker Allergan Inc. (AGN) , with Actavis Chief Executive Brent Saunders continuing in that role. Paul Bisaro, likewise, will remain the board's executive chairman. The company said the management team will include members of both Actavis's and Allergan's executive ranks.

Caesars Entertainment Corp.'s (CZR) largest unit skipped a $225-million interest payment on some junior bonds, triggering a 30-day grace period before a default, according to a filing. Standard & Poor's responded by cutting the unit's credit rating by four notches to default.

Callaway Golf Co. (ELY) raised its 2014 outlook amid operating improvements, but warned of softness next year tied to unfavorable currency effects.

Magellan Health Services Inc. (MGLN) gave a muted outlook for its upcoming year on Tuesday, as the healthcare-management provider seeks to offset high costs with growth from acquisitions and other steps.

Wausau Paper Corp. (WPP) terminated a "poison pill" antitakeover defense that was adopted in 1998 and set to expire in 2018.

WellCare Health Plans Inc. (WCG) appointed Chief Operating Officer Kenneth A. Burdick as its new chief executive, a year after firing Alec Cunningham over differing perspectives.

Write to Maria Armental at maria.armental@wsj.com and Tess Stynes at tess.stynes@wsj.com

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