HEADLINE STOCKS-U.S. small/midcap stocks on the move on Oct 26

(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), $10.06, up 9 pct

ARENA PHARMACEUTICALS (ARNA.O), $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), $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), $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]

MATRIXX INITIATIVES MTXX.O, $4.72, down 6 pct

The company said the U.S. Food and Drug Administration has indicated that it is unwilling to reverse its position regarding the warning letter issued on company's nasal versions of Zicam cold remedy. [ID:nBNG79441]

ELRON ELECTRONIC INDUSTRIES LTD ELRN.O, $6.70, up 10 pct

The company said it received a non-binding indication of interest from a third party regarding the potential acquisition of its subsidiary Medingo Ltd. [ID:nWNAB3958]

SUPERGEN INC SUPG.O, $2.68, up 13 pct

The company said it entered into multi-year collaboration with GlaxoSmithKline to develop cancer drugs and received an upfront payment of $5 million. [ID:nBNG506367]

BIOCRYST PHARMACEUTICALS INC (BCRX.O), $10.81, up 12 pct NOVAVAX INC (NVAX.O), $4.31, up 7 pct

Shares of the flu drug developers were up after U.S. President Barack Obama declared 2009 H1N1 swine flu a national emergency on Saturday.

NYER MEDICAL GROUP NYER.O, $1.89, up 173 pct

The company said it agreed to sell assets of 12 Eaton Apothecary pharmacies in the Boston area to Walgreen Co (WAG.N). [ID:nBNG482027].

ARES CAPITAL (ARCC.O), $12.23, up 14 pct

ALLIED CAPITAL ALD.N, $3.65, up 34 pct

Finance company Ares Capital said it will buy rival Allied Capital in an all-stock deal valued at $648 million. [ID:nBNG507417]

MARINEMAX INC (HZO.N), $7.73, up 8 pct

Rochdale Securities upgraded the boat retailer to "buy" citing a stabilizing marine market. [ID:nBNG509623]

SOHU.COM INC (SOHU.O), $60.23, down 15 pct

The Chinese media company posted better-than-expected quarterly results but guided fourth-quarter revenue below Street projections. [ID:nWNAB3887]

ION GEOPHYSICAL CORP (IO.N), $4.53 up 28 pct

The company announced a joint venture with China-based BGP Inc to provide land seismic products. [ID:nBNG367721]

PIONEER NATURAL RESOURCES INC (PXD.N), $44.67, up 4 pct

The oil and natural gas company reported positive initial production from one of its wells in the Eagle Ford shale, located in Texas. [ID:nBNG506499]

SYMMETRY MEDICAL INC (SMA.N), $8.09, down 15 pct

The orthopedic-implants maker cut its 2009 outlook, citing reduced order flow due to lower-than-expected demand in both its orthopedic and non-orthopedic markets. [ID:nBNG427508] (Reporting by Jennifer Robin Raj in Bangalore)