Molycorp. Inc. (NYSE: MCP) shares advanced 12.3% to $66.54, on volume of 10.6 million, compared to 6.1 million, after the producer of rare-earth metals bought a controlling stake in Estonia-based AS Silmet.

Oracle Corporation (Nasdaq: ORCL) traded in 23.7 million shares Monday, a titch short of its daily average of 26.9 million. Prices for ORCL nipped up 0.3% to $34.12.

Duoyuan Global Water Inc. (NYSE: DGW) descended 27% in price to $4.01. Volume for the stock was eight million shares, towering over its daily average of 416,379, after a research firm with a short position in the stock accused the Chinese company of committing fraud.