Private hospitals operator Spire Healthcare looks set for a near-£1 billion IPO valuation with the range set at between 210p and 300p per share. Final pricing is expected next week (18 Jul) for the flotation first covered by Shares last month.

Housebuilder Taylor Wimpey (TW.) slips 1.3% to 115.6p despite a trading update revealing a strong first half performance. The group remains on track for operating profit margins for the first half to show a minimum 300 basis points jump.

Technology commercialiser Imperial Innovations (IVO:AIM) slips 1.7% to 439.8p on spending £4 million increasing its interest in life sciences research tool provider Abzena. The deal takes Imperial’s stake in the company to 23.6 million shares, or £18 million, and was made ahead of Abzena’s 80p a share AIM debut on Thursday (10 Jul).

AIM-quoted Mycelx (MYXR:AIM) falls 10.7% to 437.5p as the market reacts with scepticism to claims that the company can make up a first half shortfall to meet expectations for 2014. Customer delays spark the warning for the hydrocarbons-from-waste water specialist.

Education technology supplier RM (RM.) posts lower interim revenues, having ditched its hardware business, but operating profits almost 50% higher. The company's turnaround strategy remains on track, although investors harbour woories about surprisingly reduced cashflow, the shares falling close on 4% to 165.75p.

Telematics kit maker Trakm8 (TRAK:AIM) jumps more than 12% to 78p as the microcap posts a near doubling of full year revenues and a substantial hike in pre-tax profits.

US-based CV checking software supplier ClearStar picks AIM over Nasdaq for its IPO, where it expects to raise £8.7 million to fund UK and Europe expansion.

Oil and gas explorer Fastnet Oil & Gas (FAST:AIM) gains 3.4% to 5.64p as it secures better terms on its Tendrara project onshore Morocco. The group will now carry partner OGIF for the costs of two rather than three wells and has extended the deadline for the first well from September this year until April next year. In the mean time it is looking for a partner to help meet the costs of drilling. Cantor Fitzgerald comments: 'Tendrara offers investors a low risk entry point into a discovered gas asset situated in an emerging hydrocarbon province.'

New Zealand and Australia focused Mosman Oil & Gas (MSMN:AIM) gains 4.1% to 41.75p as it reveals oil shows from its second well on the Petroleum Creek project in New Zealand.

Drug maker Summit (SUMM:AIM) improves 2.8% to 143p on positive results from the first clinical trial phase of its Duchenne Muscular Dystrophy treatment.

Aging-focused consumer healthcare play Venture Life (VLG:AIM) gains 2% to 101.5p on Elpen Pharmaceuticals agreeing to sell two of its NeuroAge supplements in Greece. The products raise alertness or encourage sleep and will be available from next year.

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Issue Date: 07 Jul 2014