Shares of Altiris ( ATRS) were among technology's winners Monday, jumping 19% after the software maker agreed to be acquired by Symantec ( SYMC) for about $830 million in cash. Symantec will pay Altiris shareholders $33 a share, representing a 22% premium over Friday's closing price of $27.14. "By combining the endpoint management solutions from Altiris with the security expertise from Symantec, we believe we can offer customers a more comprehensive solution to protect and manage the millions of connected devices that make up the fabric of today's global IT infrastructure," Symantec said. The deal is expected to close in the second quarter. Shares of Altiris were trading up $5.32 to $32.46, while shares of Symantec fell 28 cents to $17.49. Radware ( RDWR) slid 14% after the software maker's fourth-quarter results came in below Wall Street's estimates. The company earned $110,000, or a penny a share, on revenue of $21.1 million. Excluding stock-based compensation, the company earned $944,000, or 5 cents a share. Analysts polled by Thomson Financial expected earnings of 8 cents a share and revenue of $21.9 million. In the year-earlier quarter, Radware earned $2.4 million, or 12 cents a share, on revenue of $21 million. Shares were down $2.06 to $12.58. Shares of Silicom ( SILC) soared 35% after the networking company posted big gains in fourth-quarter earnings and revenue. The company earned $1.1 million, or 20 cents a share, up from $473,000, or 11 cents a share, a year earlier. Revenue rose to $5 million from $3.1 million. Shares were trading up $3.58 to $13.58.