(Updates to add Vivus, Arena and Hansen )

(For large-cap stocks on the move, click on [WATCH/US])

Oct 26 (Reuters) - Some small and midcap stocks on the move on Monday: VIVUS INC (VVUS.O: Quote, Profile, Research), $10.06, up 9 pct

ARENA PHARMACEUTICALS (ARNA.O: Quote, Profile, Research), $4.53, up 4 pct

Both the biopharmaceutical companies presented detailed positive late-stage data on their experimental weight-loss drugs on Sunday. [ID:nBNG431143]

HANSEN MEDICAL (HNSN.O: Quote, Profile, Research), $2.67, down 7 pct

A class action lawsuit was filed against the company, alleging that it had misstated its revenue.

NOVATEL WIRELESS (NVTL.O: Quote, Profile, Research), $12.40, up 12 pct

Barron's wrote that shares of Novatel could advance to $20, helped by a new portable Wi-Fi network device that could increase earnings. [ID:nN25159911]