Epicor Software Corp. (Nasdaq: EPIC) shares climbed 11.3% to $12.51, on volume of 11 million shares, routing its daily average of 274,000, after the business supplier agreed to be acquired in a deal worth about $976 million.

Cisco Systems Inc. (Nasdaq: CSCO) dealt in 41.2 million shares Monday, compared to a 73.1-million-share average. Prices were flat, though, at $17.03. Shares of video conferencing products maker Radvision (see previous blog) are down $1.69, or 14%, at $10.27 after the company this morning cut its Q1 outlook, saying that revenue from Cisco Systems is coming in much lower than expected, at about $2 million versus $5 million expected.

OmniVision Technologies Inc. (Nasdaq: OVTI) shares slid 8.6% to $33.09, on volume of 7.5 million shares, or triple its daily average, on worries it might be replaced as Apple Inc.(Nasdaq: AAPL) image-sensor supplier in the next version of the iPhone. Apple shares dipped 1.4% to $339.70.