Icagen Inc. (Nasdaq: ICGN) vaulted 33.79 percent in price Monday to $1.94. Volume of 1,107,887 shares quadrupled its full-day average. The North Carolina-based drug company today provided an update on its sodium channel program for pain and related disorders, which is being conducted in collaboration with Pfizer.

Citigroup (NYSE: C) was a volume leader Monday, trading in 207,906,616 shares, making progress against its daily average of 556,140,000. Share prices for Citi eased 0.11 percent to $4.70. Citi today announced a multi-year renewal of its long-standing U.S. private label credit card partnership with The Children’s Place Retail Stores Inc., the largest pure-play children’s specialty apparel retailer in North America.

Ultrapetrol Ltd. (Nasdaq: ULTR) fell 13.95 percent Thursday to $6.45, on volume of 336,901 shares, five times its full-day average. Ultrapetrol announced today its intention to offer to sell, subject to market and other conditions, $60.0 million aggregate principal amount of its Convertible Senior Notes due 2017.