NEW YORK (CNNfn) - Siebel Systems Inc. surged 8-3/16 to 131-1/2 in before-hours trading Tuesday, according to the Island electronic trading network, after the maker of customer service software was selected for addition to the Standard & Poor's 500-stock index.
 S&P said Monday that Siebel (SEBL: Research, Estimates) would replace entertainment company CBS Corp. (CBS: Research, Estimates) in the benchmark index. CBS is being acquired by Viacom (VIA: Research, Estimates).
Broadcom Corp. (BRCM: Research, Estimates) flew ahead 10-3/4 to 185 on Island.
On Tuesday, Broadcom, the leading maker of semiconductors used in high-speed Internet access devices, said it was entering the white-hot market for optical networking with a new low-cost chip.
For consumers, the development of low-cost, optical wide area networks should speed the delivery of so-called virtual private networks that would let users open windows on their televisions and access company computer networks securely from their living rooms.
BroadVision (BVSN: Research, Estimates) moved up 5-1/4 to 48-5/16 on Island. The worldwide supplier of personalized e-business applications, announced Monday that it was ranked by Inter@ctive Week as one of its top companies to work for.
AT&T (T: Research, Estimates) fell 4-5/8 to 44-3/8, according to Instinet in New York, after it reported earnings in line with Wall Street's expectations
 The phone and cable TV service provider said its profit, excluding one-time items, fell to $1.73 billion or 53 cents a share, from $1.72 billion, or 61 cents a share, a year earlier. The results matched Wall Street expectations of 53 cents a share, according to research firm First Call, which tracks analysts' estimates.
"The market looks OK, but it is pretty light volume," said a trader at Madoff. "Maybe in Europe people are still recovering from the long holiday weekend, but we will see how New York opens."
On Island, shares in Terayon Communication Systems, Inc. (TERN: Research, Estimates) continued to climb, up 2-1/4 to 129-1/2. The company announced Monday that Casema -- the third-largest cable television operator in The Netherlands with more than 1.3 million subscribers -- will offer telephone services using Terayon's Multigate broadband voice-over-cable system. Terayon stock rose by 34-1/4 in during regular trading hours on Monday.
Casema has already begun deploying Terayon's broadband telephony systems in central and southwest sections of The Netherlands.
Hemagen Diagnostics (HMGN: Research, Estimates) gained 1-1/8 to 4 on Island. The biotechnology company, a maker of laboratory medical diagnostic kits used to aid in the diagnosis of certain autoimmune and infectious diseases, said it has received approval from the U.S. Food and Drug Administration to market nine chemical chemistry reagents.
Disney (DIS: Research, Estimates) added 3/4 to 42-3/4, according to Madoff. The company is in a financial wrangle with Time Warner (TWX: Research, Estimates), the parent company of CNNfn, over the cost and terms of the rights to transmit programs carried by the ABC network on Time Warner cable. 
-- compiled by Antoinette Coulton from staff and wire reports
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