Among the companies whose shares are expected to see active trade in Monday's session are Alcoa Inc., Cablevision Systems Corp. and Dominion Homes Inc.

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Alcoa Inc. (AA) is expected to report first-quarter earnings of 51 cents a share, according to analysts polled by Thomson First Call.

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99 Cents Only Stores (NDN) said same-store sales increased 1.8% in the fourth quarter, compared with the year-ago period. Total sales were $253.9 million during the period, up 4.6% from $242.6 million a year earlier, the City of Commerce, Calif.-based retailer said.

Charter Communications Inc. (CHTR) said it expects first-quarter revenue of $1.365 billion to $1.38 billion, and adjusted earnings before interest, taxes, depreciation and amortization to be essentially flat compared with the year-ago period. The St. Louis-based broadband communications company also said it expects capital expenditures for the first quarter to range from $235 million to $260 million.

Cablevision Systems Corp. (CVC) declared a special cash dividend of $10 a share for its Class A and Class B shares. The dividend is payable April 24 to shareholders of record as of April 18. The Bethpage, N.Y.-based media and telecommunications company said the dividend will be paid from the proceeds of a $3 billion distribution from its subsidiary, CSC Holdings Inc

Connetics Corp. (CNCT) said the Securities and Exchange Commission is conducting a formal investigation into whether the company, its employees, officers, directors or others may have violated federal securities laws. The Palo Alto, Calif.-based pharmaceutical company said that on March 28, the SEC filed a civil lawsuit against a Connetics employee for alleged insider trading. The company has since fired the employee. Connetics said it is not named as a defendant in the lawsuit.

A bankruptcy court judge has approved auto-parts supplier Delphi Corp.'s (DPHIQ) plan to try to induce thousands of hourly employees to retire early.

Dominion Homes Inc. (DHOM) said it has sold 475 homes during the first quarter, down 24% from 626 homes during the same period last year. The company closed 315 homes during the quarter, compared with 478 homes last year.

Smith & Wollensky Restaurant Group Inc. (SWRG) said same-restaurant sales rose 3% in March, compared with the year-ago period. Total consolidated restaurant sales for the month were $12.3 million, down 5.4% from a year ago. For the first quarter, same-restaurant sales increased 1.9% vs. a year ago, the New York-based restaurant chain said. Total consolidated restaurant sales for the period fell by 6.6%.