Among the companies whose shares are expected to see active trade in Monday's session are Tyson Foods Inc., Sysco Corp., Fisher Scientific International Inc. and Aztar Corp.

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Airgas Inc. (ARG) is expected to report fiscal fourth-quarter earnings of 43 cents a share

Chesapeake Energy Corp. (CHK) is seen posting a profit of 98 cents a share in its first quarter

Fisher Scientific International Inc.'s (FSH) first-quarter results are expected to show a per-share profit of 83 cents.

Harris Corp. (HRS) is expected to post fiscal third-quarter earnings of 55 cents a share.

Humana Inc. (HUM) is seen reporting a first-quarter per-share profit of 43 cents.

Principal Financial Group Inc.'s (PFG) first-quarter earnings are expected to be 76 cents a share.

PSEG (PEG) is expected to report a first-quarter profit of $1.11.

Sysco Corp. (SYY) is seen posting a fiscal third-quarter profit of 32 cents a share.

Tyson Foods Inc.' (TSN) fiscal second-quarter is expected to show a per-share loss of 25 cents.

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Arden Realty Inc. (ARI) said its shareholders have approved the company's acquisition by General Electric Co. (GE) unit GE Real Estate in a deal valued at $4.8 billion.

Avon Products Inc. (AVP) said its profit plunged 67% in the first quarter as the beauty-products giant struggled to turn around its business and put the brakes on sinking sales in Asia.

Aztar Corp. said it has received an acquisition offer of $50 a share in cash from Columbia Entertainment, topping the $48-a-share offer made earlier in the day by Pinnacle Entertainment Inc. See full story.

Chevron Corp. (CVX) said first-quarter earnings soared 49%, likely adding fuel to the political firestorm and consumer anger over the oil industry's huge profits. See full story.

Dynegy Inc. (DYN) said it will restate its 2005 financial statements and its interim statements for the second and third quarters of 2005 to reflect a $13 million increase in the company's net deferred tax liability. The restatement will reduce net income for 2005 to $90 million from $103 million, and reduce net income applicable to common shareholders to $68 million, or 18 cents a share, from $81 million, or 21 cents a share.

Ford Motor Co. (F) said it will resume vehicle production on Monday at seven assembly plants that were shut down. Ford said the issue that caused the stoppage, relating to the clutch mechanism of one of its automatic transmissions, has been resolved. The automaker said in a statement it is "confident that no affected vehicles reached customer hands," and that "the day of lost vehicle production will be made up."

Ternium S.A. (TX) reported first-quarter net earnings of $194.5 million, compared with $403.6 million during the same period a year ago. The Luxembourg-based steel conglomerate posted revenue of $1.53 billion vs. $767.6 million.