Among the companies whose shares are expected to see active trade in Wednesday's session are PepsiCo Inc., Amazon.com Inc., Sprint Nextel Corp. and Boeing Co.

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Biogen Idec Inc. (BIIB) is expected to report first-quarter earnings of 47 cents a share, according to analysts polled by Thomson First Call.

Boeing Co.'s (BA) first-quarter profit is expected to be 76 cents a share.

Cendant Corp. (CD) is seen posting earnings of 14 cents a share in its first quarter.

Colgate-Palmolive Co. (CL) is expected to post a first-quarter per-share profit of 66 cents.

ConocoPhillips' (COP) first-quarter results are expected to show per-share earnings of $2.34.

PepsiCo Inc. (PEP) is expected to report earnings of 58 cents a share in its first quarter.

Praxair Inc.'s (PX) first-quarter results are expected to show a per-share profit of 65 cents.

Sprint Nextel Corp. (S) is seen posting first-quarter earnings of 37 cents a share.

WellPoint Inc. (WLP) is expected to report a first-quarter profit of $1.07 a share.

After Tuesday's closing bell, Amazon.com Inc. (AMZN) said its quarterly profit fell 35%, despite higher sales, as the online retailer was hurt by the cost of employee stock options and higher operating expenses. See full story.See After Hours column.

Watch List

Ace Ltd. (ACE) reported first-quarter net earnings that rose 12%, and said it will take an $80 million charge to settle government investigations of "various insurance industry business practices." See full story.

Aflac Inc. (AFL) said first-quarter net income climbed 14% as U.S. sales grew strongly. Operating earnings came in ahead of analyst expectations and the company stuck to its 2006 sales and profit growth targets. See full story.

Atmel Corp. (ATML) reported first-quarter net earnings $9.24 million, or 2 cents a share. During the same period a year ago, Atmel posted a net loss of $43 million, or 9 cents a share. Revenue at the San Jose, Calif.-based semiconductor company rose 4.1% to $436.8 million from $419.8 million. Analysts polled by Thomson First Call had forecast first-quarter results to be breakeven on a per-share basis, on revenue of $421 million.

Nearly across-the-board property-level revenue increases helped Boyd Gaming Corp. (BYD) to a nice increase in first-quarter profit. See full story.

Cheesecake Factory Inc. (CAKE) reported first-quarter net income of $19.3 million, or 24 cents a share, compared with $19 million, or 24 cents a share, for the same period a year ago. Sales were $306.4 million vs. last year's $268.2 million. Excluding stock option expensing, income would have been 27 cents a share. Analysts polled by Thomson First Call on average expected income of 25 cents a share.

CheckFree Inc. (CKFR) reported a fiscal third-quarter profit that rose 142% from last year and raised its outlook for the current quarter behind continued strength in its investment services and software business. See full story.

C.H. Robinson Worldwide Inc. (CHRW) said increased demand and higher rates in its truck-transportation business helped spark a 39% rise in first-quarter profit. See full story.

Corning Inc. (GLW) said first-quarter earnings were basically flat owing to litigation expenses, but sales surged 20% as the company sold more materials used in flat-panel electronic displays. See full story.

CV Therapeutics Inc. (CVTX) reported a first-quarter net loss of $70.5 million, or $1.57 a share, compared with a loss of $46.4 million, or $1.31 a share for the same period a year ago. Revenue for the Palo Alto, Calif.-based maker of cardiovascular medicines was $5.06 million vs. last year's $5.63 million. Analysts polled by Thomson First Call expected the company to lose $1.71 a share.

Encore Wire Corp. (WIRE) said first-quarter net income was $16.1 million, or 68 cents a share, compared with $1.04 million, or 4 cents a share, during the same period last year. Quarterly revenue was $252 million, up from $137.2 million last year.

Fiserv Inc. (FISV) said its first-quarter profit fell 16% as expenses related to stock options weighed on results that were measured against a year-earlier financial performance boosted by a nonrecurring investment gain. See full story.

Ingram Micro Inc. (IM) reported a first-quarter profit that rose 45.5% from a year ago as the technology-products wholesaler reported revenue gains across all its major geographic sales regions. See full story.

Leadis Technology Inc. (LDIS) reported a first-quarter net loss of $2.79 million, or 10 cents a share, compared with a net loss of $2.53 million, or 9 cents a share, during the year-ago period. The pro forma loss was 8 cents compared with a pro forma loss of 6 cents a share a year ago. Revenue at the Sunnyvale, Calif.-based company rose to $24.1 million from $11.6 million.

Meritage Homes Corp. (MTH) said first-quarter net profit rose 230% from the year-ago period, while revenue rose 54% as home closing increased. See full story.

Microchip Technology Inc. (MCHP) said fourth-quarter net income was $75.6 million, or 35 cents a share, compared with $56.4 million, or 27 cents a share, during the same period last year. Analysts polled by Thomson First Call had expected per-share income of 35 cents. Microchip reported quarterly revenue of $247.2 million, up from $208.1 million in the prior year. Analysts were looking for a result of $244 million. Microchip added that it has increased its quarterly cash dividend 13% to 21.5 cents a share.

Murphy Oil Corp.'s (MUR) net earnings fell well short of analysts' expectations, battered by losses at its Louisiana refinery following Hurricane Katrina that offset higher income from exploration and production activities. See full story.

RF Micro Devices Inc. (RFMD) reported a fourth-quarter net loss of $1.6 million, or a penny a share, compared with a net loss of $63 million, or 34 cents a share, during the same period last year. On a pro forma basis, the company reported per-share income of 9 cents. During the same period last year, the company reported a pro forma per-share loss of 9 cents. For the fourth quarter, analysts polled by Thomson First Call had expected per-share income of 6 cents. The company said quarterly revenue was $225.9 million, up from $150.4 million in the prior year. Analysts were looking for revenue of $210 million.

Sanmina-SCI Corp. (SANM) reported a fiscal second-quarter net loss of $103.4 million, or 20 cents a share, vs. a net loss of $1.06 billion, or $1.99 a share, in the year-ago period. Excluding certain items, earnings came in at $30.5 million, or 6 cents a share, compared with $29.3 million, or 6 cents a share, last year. Revenue at the San Jose, Calif.-based electronics manufacturing company fell to $2.67 billion from $2.89 billion last year. Analysts polled by Thomson First Call had forecast earnings of 6 cents a share on revenue of $2.66 billion.

SigmaTel Inc. (SGTL) reported a first-quarter net loss of $24.7 million, or 69 cents a share. During the same period a year ago, SigmaTel posted net earnings of $25.5 million, or 68 cents a share. The per-share pro forma loss was 61 cents compared with pro forma earnings of 67 cents a year ago. Revenue at the Austin, Texas-based maker of chips for handheld music players fell to $33 million from $99.3 million.

Stanley Works (SWK) said its first-quarter profit fell 43%, hurt by weakness in its fastening systems along with restructuring and acquisition charges. See full story.

STMicroelectronics NV (STM) said late Tuesday it swung to a first-quarter profit, helped by higher sales in automotive and wireless applications. See full story.

Teco Energy Inc. (TE) reported nearly a 70% jump in first-quarter earnings, with a strong local economy and off-system utility sales helping to overcome mild winter weather and higher production costs. See full story.

Thomas & Betts Corp. (TNB) said its first-quarter profit soared 59%, driven by strong demand for its electrical products from the industrial, light commercial construction and utility markets. See full story.

XL Capital Ltd. (XL) said first-quarter net income was $458.5 million, or $2.56 a share, up 4% from a year earlier, when the Bermuda-based reinsurer made $442.9 million, or $3.18 a share. See full story.