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TRINITY MIRROR PLC (TNI.LN), a newspaper publisher, said Thursday trading will be challenging during 2011, and didn't reinstate its dividend despite a sharp rise in full-year profit, sending its shares lower.

The publisher of titles including the Daily Mirror and the People forecast a "volatile and slow" recovery in the U.K. economy, and said that advertising and circulation revenue for its existing titles continued to fall.

At 1200 GMT shares -16.75 pence, or 19.9%, at 67.5 pence.

RENOVO GROUP PLC (RNVO.LN), a biotechnology company, said it will cut more than 100 jobs and may sell assets after partner Shire PLC (SHP.LN) decided to drop its flagship anti-scarring product Juvista following disappointing clinical trial results.

Renovo in a statement said the failure of Juvista in a Phase III trial in Europe, announced last month, was a major blow for Renovo and prompted partner Shire to return rights for the treatment in the U.S., Canada and Mexico.

At 1201 GMT shares -0.25 pence, or 1.6%, at 15 pence.

Oilex Ltd. (OEX.LN), an oil explorer, said that Northwest Pty Ltd., the operator of the WA-388-P permit, offshore Western Australia, has now proposed to start drilling the first exploration well in April, after bad weather caused delays.

The well will target the "La Rocca" prospect in the Intra Mungaroo channel zone, Oilex said, adding that the well had originally been scheduled to start drilling as early as mid-February but significant cyclone activity delayed activity during the first quarter of 2011. The permit contains seven prospects.

At 1201 GMT shares -0.5 pence, or 2.1%, at 28.75 pence.

COMMUNISIS PLC (CMS.LN), a marketing services provider, said statutory pretax profit for 2010 rose 89% despite marginal revenue growth, adding that it is well positioned to cater for growing demand for targeted marketing campaigns.

The company paid an interim dividend of 0.89 pence a share, bringing the full-year dividend to 1.29 pence, in line with the 2009 figure.

At 1202 GMT shares unchanged at 31 pence.

CHURCHILL MINING PLC (CHL.LN), a manganese and coal miner, requested that trading of its securities on the Alternative Investment Market, or AIM, be temporarily suspended pending an announcement.

A spokesperson for the company wasn't able to comment.

Shares suspended at 90.25

JJB SPORTS PLC (JJB.LN), a U.K. sports retailer, said it will close 43 stores by April 2012 and review the performance of a further 46 stores in a bid to stave off collapse.

The troubled retailer is attempting to renegotiate its lease agreements using a form of arrangement known as a Company Voluntary Agreement. Under the arrangement JJB will need to win landlord backing for the agreement to be approved.

At 1202 GMT shares -0.75 pence, or 3.6%, at 20.25 pence.

ROXI PETROLEUM PLC (RXP.LN) said it expects its interest in the BNG contract area in Kazakhstan to increase to 29.7% after Canamens BNG BV told the company it won't make the final $12 million payment due under the second stage of the sale and purchase agreement, or SPA, approved by Roxi shareholders in November 2009.

Under the terms of the SPA, Roxi expects Canamens to forfeit a 6.25% interest in the BNG Contract Area to Roxi, raising its stake to 29.7% from 23.4%. Canamens' holding will fall to 28.8% from 35%.

At 1203 GMT shares -0.9 pence, or 14.9%, at 5 pence.

SPIRENT COMMUNICATIONS PLC (SPT.LN), a network testing firm, posted a 32% rise in 2010 pretax profit, and said it expects further profitable growth in 2011.

The company, which tests the performance of IT and communications systems, said demand in 2010 was boosted by the growth of remote computing services and mobile internet use.

At 1203 GMT shares -4.1 pence, or 4.1%, at 151.2 pence.

SYSTEM C HEALTHCARE PLC (SYS.LN), an information technology company, said it has agreed to a GBP87 million cash takeover offer from U.S. healthcare giant McKesson Corp. (MCK).

System C, which provides software for managing patients' records to hospitals, said the deal so far has the backing of 33% of shareholders.

At 1204 GMT shares +11 pence, or 19%, at 70 pence.

NOVAE GROUP PLC (NVA.LN), an insurance company, said it had doubled its adjusted pretax profit in 2010 but said it was still measuring the impact of New Zealand's February earthquake, which was likely to outstrip losses from a 2010 earthquake in the region.

The company proposed a full-year dividend of 15.7 pence-a-share, which is higher than the 2009 dividend of 12.4 pence.

At 1204 GMT shares +13 pence, or 3.4%, at 401 pence.

JOHN WOOD GROUP PLC (WG.LN) said that a bidding group led by Mustang Al-Hejailan Engineering, a Wood Group company, has received a five year, general engineering services contract from Saudi Arabia's national oil company, Saudi Aramco.

It didn't disclose financial details.

Wood Group will supply engineering, procurement and construction management services to support onshore and offshore oil and gas projects in Saudi Arabia. The five-year contract also comes with three one-year extension options.

At 1204 GMT shares +6.5 pence, or 1%, at 657 pence.

DJ UK Small-Cap +0.95%

AIM +0.53%

-By Tommy Stubbington, Mario Christodoulou and Iain Packham, Dow Jones Newswires; +44 (0) 20 7842 9272; uksmallcaps@dowjones.com