Purplebricks Group PLC (LON:PURP) has seen its stock fall today after a row erupted between the online estate agent and US broker Jefferies.
In a punchy 'sell' note, analysts at the US investment bank claimed Purplebricks' shares were worth just 95p - far below the 475p they were trading at the time.
They cited concerns over the number of homes that actually end up getting sold through the agent, and also questioned the group's revenue recognition and accounting policies.
Purplebricks hit back this morning though, saying that Jefferies' sales conversion figures were based on limited data and that its self-published 78% rate "more accurately reflects its sales performance".
As for the other concerns, the estate agent added that it "publicly refutes" the analysts' criticism of its revenue recognition and auditing policies.
Shares are down 6.7% to 427.9p shortly before market close in London.
Mobile Streams Plc (LON:MOS) saw a third wiped from its value after the mobile app and content developer warned that first-half revenues will be almost half what it generated last year.
The AIM company said it had been impacted by a number of changes in the Indian mobile industry, predominantly the continued growth of operator Reliance Jio.
That has "proven very challenging" to other telecom operators, which has led to consolidation within the market and increased regulation for value added services.
As a result of those challenges, Mobile Streams chopped its marketing spend by almost 80% compared to last summer's levels in a bid to protect underlying earnings (EBITDA) and preserve cash.
That has resulted in reduced revenues for the six months to the end of December of ?1.85mln - almost half the ?3.6mln it generated for the same period a year earlier, while underlying losses are expected to stay broadly the same at around ?700,000 (H1 2016: ?712,000).
Unfortunately, Mobile Streams said trading conditions in India and Argentina - its two core markets - are "unlikely to change materially" in the second half of the year, meaning second half revenues will be slightly below what it posted last year.
Shares in Bluerock Diamonds Plc (LON:BRD) lost their sparkle today, falling over 19% to 1.55p as the South Africa focused group updated on claims made by former chief executive Riaan Visser.
The firm said it aims to "vigorously defend" itself against claims made by Visser.
Further to its announcement on February last year, the group has now received notice that Visser, and certain companies controlled by him, intend to apply to place the company's operating subsidiary, Kareevlei Mining (Pty) Ltd in provisional liquidation.
The firm, which owns and operates the Kareevlei Diamond Mine in the Kimberley region of South Africa, said that, as previously noted, having taken legal advice, it remains of the view that based on currently available information the claims are without merit.
On the plus front, copper firm Weatherly International plc (LON:WTI) rose almost 27% to 2.25p in London as it said shareholders of Australia -listed Intrepid Mines Limited (Intrepid) voted in favour of the deal where Weatherly will acquire the Kitumba Project in Zambia.
Weatherly also outlined its project development plan for Kitumba, which is focused initially on a high-grade and high-confidence Phase 1 development zone within the resource.
A JORC-compliant measured and indicated (M&I) resource at Kitumba from 2015 contains 24.9Mt (million tonnes) at 2.32% copper, using a cut-off grade of 1% copper.
Top London riser was resource group Eurasia Mining plc (LON:EUA) as it cheered the market with a positive update from Russia.
Its application for a mining permit for the Monchetundra project in the Kola peninsula is progressing much quicker than expected, it revealed.
Rosnedra has now approved a draft of the permit and has forwarded the relevant documents to the ministry for defence (MOD) and Federal Security Service (FSB) for their go-ahead.
Shares surged 30% to stand at 0.325p in London.
Elsewhere, coal explorer Altona Energy plc (LON:ANR) added over 10% to 0.525p to be among the notable City gainers.
It said that a non-binding Memorandum of Understanding (MoU) between it and its joint venture partners Wintask Group and Sino-Aus Energy Group had been signed over assessing the potential for a conventional coal mine in the Westfield tenement.
"The economics of conventional coal mining in Australia are at their strongest level for several years with a number of thermal coal mine companies, such as Whitehaven Coal, showing significantly higher share prices and exceptional profits," noted Nick Lyth, the chief executive of Altona.
On the losing side, telecoms giant BT Group (LON:BT.A) was a notable casualty, down over 4% to around 245p as its woes continue.
The firm's revenue fell 3% in the third quarter, analysts having expected a gain.
It comes as the group's struggling IT business, which provides multinational companies with cloud-based and other digital offerings, showed continued weakness.
Meanwhile, its TV service lost 5,000 customers during the quarter compared to an addition of 52,000 in the same period a year ago.
Eurasia Mining plc (LON:EUA) says its application for a mining permit for the Monchetundra project in Russia is progressing much quicker than expected. Rosnedra has now approved a draft and has forwarded the relevant documents to the ministry for defence (MOD) and Federal Security Service (FSB) for their go-ahead. Big Pic last week.
Premier African Minerals Limited (LON:PREM) has found more high-grade intersections through it latest step-out drilling at the Zulu lithium deposit in Zimbabwe. Two holes 250m east of the Main Zone intersected multiple pegmatites with average grades of 1.17% and 1.04% lithium oxide.
SDX Energy Inc (LON:SDX) told investors it has now spudded the KSS-2 development well at the Sebou permit in Morocco. It is the sixth well in a nine well campaign, and it is expected to take between 10 and 15 days to drill. The company expects, if the well is a success, that it will be tested and connected to the field infrastructure for production.
Gfinity Plc (LON:GFIN) has added another major esports franchise to the line-up for the third season of its Elite Series gaming tournament. Hashtag United - which was founded in 2016 by FIFA gamer and Youtube star Spencer Owen - has acquired its place on the roster for the event which is due to kick off next month.
Stobart Group Ltd (LON:STOB) told investors it had a new chief financial officer, Richard Laycock, with effect from yesterday (Feb 1). He joined the group a decade ago and became group finance director in October 2014.
Bluerock Diamonds Plc (LON:BRD) announced that, further to its announcement of 23 February 2017 relating to certain claims made by the AIM-listed company's former CEO, Riaan Visser, the group has received notice that Visser, and certain companies controlled by him, intend to apply to place the company's operating subsidiary, Kareevlei Mining (Pty) Ltd in provisional liquidation. The diamond mining company, which owns and operates the Kareevlei Diamond Mine in the Kimberley region of South Africa said, as previously noted, having taken legal advice it remains of the view that based on currently available information the claims are without merit. No material new information has been provided by Visser at this stage and, accordingly, the group intends to vigorously defend itself in this matter.
InnovaDerma PLC (LON:IDP) has confirmed that the total number of ordinary shares that its executive chairman, Haris Altaf Chaudhry has an interest in, including that of the persons closely associated with him, remains unchanged and is 5,805,220 ordinary shares, equating to approximately 40.38% of the company's entire issued share capital. The group said the announcement was being made to correct an error in an announcement made on 16 November 2016.
Touchstone Exploration Inc. (LON:TXP) (TSX:TXP), the oil and gas exploration and production company active in the Republic of Trinidad and Tobago, announced that James Shipka, its chief operating officer will be presenting at the World Outlook Financial Conference on 2 February 2018 in Vancouver, British Columbia.