Some significant movers at around 3.15pm..
RISERS
Kolar Gold plc (LON:KGLD), up 25% to 1.5p as it updated on its investment in Geomysore Mining Services (India) Private Limited (GMSI) and their forthcoming drilling activity.
Shanta Gold (LON:SHG) , up 11.86% to 8.25p as drilling near the New Luika mine suggests the high-grade area has potential for underground mining.
Melrose (LON:MRO), the turnaround firm, up 34.35% to 550.5p as it said it is buying US heating, air-conditioning and controls maker Nortek for $1.44 billion (£1.1 billion).
FALLERS
IAG (LON:IAG) down 6.9% to 352.40p despite it revealing that group traffic, as measured in revenue passenger kilometres, rose 13.6% in June from last year.
Barratt Developments PLC (LON:BDEV), down 5.11% to 332.40p as Brexit worries continue to rock the whole housing sector.
Newmark Security (LON:NWT) down over 34% to 1.83p as it warned on tough current trading conditions but said it was optimistic on the future. The group says operating profit for the current year to April 30, 2017 is expected to be significantly less than for 2016.
Some significant share movers at 12 noon on Wednesday..
RISERS
London Capital Group Holdings plc (LON:LCG), up 12.82% to 5.5p as it revealed that despite volatility in the financial markets as a result of the EU referendum, the immediate impact of the UK's vote to leave the EU has been materially positive for the company in terms of revenues and profitability.
Hummingbird Resources plc (LON: HUM), up 4.89% to 24.125p as it awarded the EPCM contract for its Yanfolila Gold Project in Mali to SENET - a leading South African project management and engineering company.
Metal Tiger PLC (LON:MTR), up 6.2% to 3.435p as the investment firm reported a positive update from partner MOD resources for its Botswana joint venture.
FALLERS
Vislink PLC (LON:VLK) down almost 50% to 16.625p as it reported slower orders for the second quarter to June 30 in the software division Pebble Beach Systems (PBS).
Stellar Diamonds PLC (LON:STEL) down 2.04% as it revealed revenues of US$228,000 at an average of US$72.65 per carat from the auction of diamonds from its 75% owned, Baoulé kimberlite pipe in Guinea.
Mkango Resources (LON:MKA), down 7.89% to 4.375p as the rare earths mining grouop issued a corporate update on its corporate social responsibility programmes and a review of the airborne geophysical data in Malawi.
Some notable share movers on Wednesday at around 8.45am
RISERS
Melrose PLC (LON:MRO), up 19.04% to 487.75p as it struck a deal to buy US air conditioning and security technology group Nortek for $1.44bn in cash, funded by a proposed £1.61bn issue of new shares.
AFC Energy plc (LON:AFC), up over 10% to 15p as it said the design and basic engineering of the company's new 10 kilowatt (kW) fuel cell system has been completed. This was milestone number four of the company's published 2016 strategic milestones schedule.
Scancell Holdings Plc (LON:SCLP), up 8.33% to 16.25p as the biotech hailed latest findings from the Phase 1/2 clinical trial of lead cancer drug SCIB1, which continues to show what it called "compelling" survival data.
FALLERS
Newmark Security PLC (LON:NWT), down over 40% as it warned its budgeted operating profit for the current year is expected to be significantly less than full year 2016.
EasyJet PLC (LON:EZJ), down 2.46% as it revealed its June passenger stats, which showed cancellations almost doubled over the last year.
Tullow Oil plc (LON:TLW), down 11.01% to 214.10p as it said it was looking to raise US$300mln via a convertible bond issue.