Among the companies with shares expected to actively trade in Monday's session are Arkansas Best Corp. (ABFS), Tyson Foods Inc. (TSN) and Apollo Global Management LLC (APO).

Transportation company Arkansas Best said its largest subsidiary, ABF Freight System Inc., reached a tentative agreement on a five-year labor contract with the Teamsters National Freight Industry Negotiating Committee, the negotiating arm of the International Brotherhood of Teamsters, according to a regulatory filing after market hours on Friday. Shares rose 19% to $12.60 premarket.

Tyson's fiscal second-quarter earnings fell 43% as higher beef and chicken prices weren't enough to offset the meat processor's increased costs. Earnings-per share surprisingly fell 18% last quarter, while revenue didn't rise as much as analysts anticipated. The company also lowered its full-year sales estimate. Shares fell 6.1% to $23.41 premarket.

Apollo Global Management reported a big first-quarter beat, as the private-equity company saw a large jump in assets under management, particularly in the credit space, while the firm continued to cash in on winning past investments. Class A shares rose 9.1% to $29 premarket.

A recent story in Barron's said oil and natural-gas developer Linn Energy LLC (LINE) might be the country's most overpriced large energy producer, adding that the firm's partnership units may be worth less than half of their current quote based on a range of financial measures, including book value, cash flow and the value of energy reserves. Linn shares fell 3.1% to $36.53 premarket, while shares of LinnCo LLC (LNCO)--which is formerly a unit of Linn Energy and has no assets or operations other than to own interest in Linn Energy--dropped 5.6% to $39.50.

Crestwood Midstream Partners LP (CMLP) and Inergy L.P. (NRGY) agreed to merge in a complex cash-and-stock deal that aims to create a fully integrated midstream partnership focused on rapidly developing U.S. shale energy plays. Inergy shares rose 4% to $22.89 premarket.

 
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Moody's Investors Service raised its outlook on Aon PLC (AON) to positive from stable, citing expectations the insurance brokerage will continue to improve its financial leverage and fixed charge coverage metrics through earnings growth and cash contributions to its underfunded pension plans.

Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB) on Friday said first-quarter profit jumped 51% on improvements at key insurance operations and rising profits at its railroad.

Bristol-Myers Squibb Co. (BMY) and AstraZeneca PLC (AZN) said a year-long study of metreleptin showed it reduced average blood sugar levels in pediatric patients with lipodystrophy.

Covidien PLC (COV) has reduced its full-year net sales guidance after factoring in the impending spinoff of its pharmaceuticals business, while adjusting its financial statements for the past three years.

E.W. Scripps Co.'s (SSP) first-quarter loss narrowed thanks to lower expenses, though the newspaper and television company reported advertising sales fell amid weaker political advertising.

Standard & Poor's Ratings Services cut its rating on Hospira Inc. (HSP) by two notches, citing the generic-injectable-drug manufacturer's drawn-out manufacturing problems and product replacements.

Real-estate investment trust Macerich Co. (MAC) will join the S&P 500 index, replacing managed-care company Coventry Health Care Inc. (CVH) following its acquisition by Aetna Inc. (AET), S&P Dow Jones Indices said.

Moody's Investors Service has lifted the ratings outlook for Marsh & McLennan Cos. (MMC) to positive from stable, citing favorable trends in the professional-services company's profit margins and financial flexibility metrics.

Meritor Inc.'s (MTOR) board says its chairman, chief executive and president, Charles G. McClure, is leaving the producer of parts for commercial vehicles, and has named Ivor J. Evans as its new chairman.

Stein Mart Inc. (SMRT) regained compliance with Nasdaq rules as it filed financial results for its second through fourth quarters of fiscal 2012, and restated results for previous periods. The clothing and home furniture retailer, which has been plagued by accounting errors, said its fiscal fourth-quarter earnings more than doubled as same-store sales increased. The company said it plans to continue with its strategy of coupons and lowered prices, which is expected to result in slightly narrower gross margins in the current year.

Write to Anna Prior at anna.prior@dowjones.com

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