Among the companies with shares expected to actively trade in Wednesday's session are Aramark Holdings Corp. (ARMK), C.H. Robinson Worldwide Inc. (CHRW) and Merck & Co. (MRK).

3M Co. (MMM) unveiled a new $12 billion share-buyback program, continuing the industrial-products maker's practice of using cash flow to fund shareholder-friendly moves. Shares edged yp 1.2% to $128.28 premarket.

Aflac Inc.'s (AFL) fourth-quarter earnings rose 16% but a weaker yen and dollar exchange rate continued to weigh on the company's core operations in Japan. Shares edged down 2.4% to $60 premarket.

Aramark said its fiscal first-quarter earnings rose 4.5% as the food-services company posted broad-based revenue growth in its first report as a public company. Results beat estimates, pushing shares up 6% to $26.50 premarket.

C.H. Robinson's fourth-quarter profit fell 64% as the transportation and logistics company's truckload net revenue margin fell amid higher costs per-mile. Results missed Wall Street's expectations, sending shares down 8.1% to $53.88 premarket.

Genworth Financial Inc.'s (GNW) fourth-quarter profit rose 24% as the life and mortgage insurer cut expenses and reported higher net investment gains. The latest results topped expectations. Shares rosed 3.2% to $15 premarket.

Hain Celestial Group Inc. (HAIN) said its fiscal second-quarter earnings rose 30% on higher revenue, although its gross margin narrowed. But the top line missed analysts' expectations, sending shares down 6.6% to $85.01 premarket.

IAC/InterActiveCorp. (IACI) said its fourth-quarter earnings jumped 89% as the Internet firm managed to offset a decline in search and media revenue with cost cutting. Revenue missed estimates, sending shares down 5.6% to $65 in light premarket trading.

Merck said its fourth-quarter earnings fell 14% on weaker sales as the drugmaker also was hit by expenses related to its cost-cutting efforts. Results missed estimates, and the company's sales outlook for the year was weak. Shares rose 1.6% to $54.36 premarket as the company also said it entered three separate collaboration agreements with other drugmakers to evaluate its investigational MK-3475 immunotherapy cancer treatment.

Myriad Genetics Inc. (MYGN) said it has agreed to acquire Crescendo Bioscience Inc. for $270 million in cash as the biopharmaceutical company looks to expand into the high-growth autoimmune market. Shares climbed 12% to $30.35 premarket.

Tableau Software Inc. (DATA) swung to a surprise fourth-quarter profit as the business software maker's revenue surged again. The company's adjusted earnings and revenue beat expectations, pushing shares up 12% to $88.70 premarket.

Usana Health Sciences Inc.'s (USNA) fourth-quarter profit increased 9.9% as the nutritional-products maker posted higher global sales, results that easily exceeded Wall Street's expectations. Shares surged 15% to $67.35 premarket.

Xoom Corp. (XOOM) swung to a fourth-quarter profit as the international money-transfer provider reported a jump in revenue. But the company's full-year earnings outlook fell short of Wall Street's expectations. Shares dropped 13% to $24.46 premarket.

 
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Ameriprise Financial Inc. (AMP) said its earnings fell 24% in the fourth quarter as expenses increased, but operating earnings and revenue at the financial-services company grew. The results beat Wall Street expectations.

Beam Inc.'s (BEAM) fourth-quarter profit fell 19% as increased costs offset strength in its premium whiskey business. Results beat estimates.

Cerner Corp. (CERN) said fourth-quarter earnings fell 46% as a charge related to an unfavorable arbitration ruling and other items overshadowed improved revenue and margins.

Coca-Cola Enterprises Inc. (CCE) said its fourth-quarter earnings jumped 35% as the European bottler increased volume in Coca-Cola trademark brands, including a 20% rise in Coca-Cola Zero. The bottom line beat estimates.

ConAgra Foods Inc. (CAG) is recalling about 5,200 cases of mislabeled Healthy Choice Chicken with Rice Microwaveable Bowl Soup that may pose a health risk to people that are allergic to products containing egg or wheat products, or who are gluten intolerant.

DeVry Education Group Inc. (DV) on Tuesday said the Federal Trade Commission has requested documents and information about the company's marketing, advertising and the sale of secondary and postsecondary educational products and services.

Elizabeth Arden Inc. (RDEN) said its fiscal second-quarter profit declined 22% as the beauty-products company posted weaker sales in both its North American and international businesses. Results came in at the high end of the company's previous outlook.

Equity Residential (EQR) said its fourth-quarter profit fell 70% due in part to a jump in total expenses, but normalized funds from operations came in at the high end of the apartment landlord's projections.

Genomic Health Inc. (GHDX) swung to a loss in the fourth quarter due in large part to the cost of an agreement with another company. The company's top-line guidance for the year came in below analysts' expectations.

Sales of Gilead Sciences Inc.'s (GILD) new treatment for hepatitis C infections totaled $139.4 million in the final weeks of 2013, after only winning U.S. Food and Drug Administration approval in early December.

Spectra Energy Corp. (SE) unveiled capital spending plans for expansion projects totaling $1.3 billion for this year, as well as average annual increases to capital spending of roughly $2 billion through 2016.

Thor Industries Inc. (THO) issued a preliminary sales target for the fiscal second quarter that missed Wall Street's projections, as the recreational-vehicle maker said poor winter weather hurt sales and production.

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

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