FTSE 350: top ten risers so far this year But the focus has turned to C&WW's core assets, including the biggest fibre network in the UK, and more than 425,000km of undersea cables connecting around 150 countries. We also know more about its enviable client base than we used to. C&WW has contracts with 70 companies in the FTSE 100, making it a powerful platform for any company trying to build a so-called "enterprise" business. Some of C&WW's shareholders think that Vodafone has significantly undervalued the business. But most of them seem to feel the same way as C&WW's chief executive Gavin Derby, who stands to make £650,000 if and when the telecoms firm changes hands. There is no obvious way for C&WW to give its shareholders much of a return in its current situation. They're all banking on Vodafone bringing the bid home. Ophir Energy +101.5pc Ophir Energy's stellar rise has been driven by a remarkable run of drilling success - in May Ophir and operating partner BG Group announced their fifth consecutive discovery of significant volumes of gas offshore Tanzania. Having only listed last year, Ophir has already found itself the subject of takeover speculation, with oil supermajors keen not to miss out on the exciting new East African frontier. While further successes would send shares higher, Deutsche Bank initiated coverage recently with a 'hold" rating, warning that "near-term risk and reward is more finely balanced" and that "perhaps more importantly, we believe Ophir has given a strong sign that industry interest in its Tanzania position won't be welcomed just yet." Ocado +85pc Many in the City saw Ocado as a typical internet stock - a clever idea, set up by ex-investment bankers, and doomed never to make a profit. The profit is as far away as ever, but the company has turned around disappointing sales in recent months, thanks to a concerted push on marketing. It appears that troubles at its warehouse are genuinely fixed and it can start to increase its market share. The rest of the year, however, will be tough for the company as Tesco - which Ocado promises to match on price - turns the screw to try and regain the initiative. It's been a satsifying few months for shareholders but the excitement is likely to continue. Logica +80pc What a difference a bid makes. A few days ago, Logica's share price was languishing, hard hit by the eurozone crisis. Then last Thursday, Canada's top IT services company CGI came along with a £1.7bn bid. Pitched at more than a 60pc premium to Wednesday's share price, the stock immediately leapt. The board, whose directors hold 18.2pc of the stock, have recommended the deal. But that didn't stop gleeful traders betting on a counterbid that could send the stock even higher. They argue that Logica, which last year issued a profit warning and outlined plans to cut 1,300 jobs, has been unfairly treated by investors. The bid is all very well, but the stock is still far adrift from the price even 12 months ago. Perform +74pc Shares in Perform, the online sports information business, have risen by nearly three quarters since the start of the year, on the back of its largest acquisition to date. Its €120m (£97m) deal for RunningBall, a company which provides real-time data about football matches, has helped to bolster the fortunes of Perform's football website, Goal.com. The popular site used to see a drop-off in activity at weekends because it did not have any live news about who was scoring goals, but the RunningBall acquisition has rectified that and spawned a series of deals to license Goal.com content to gambling websites. Perform has also been buoyed by rising interest in online coverage in major sports. The BBC and ITV are both planning to broadcast coverage of the London Olympics and Euro 2012 football on the internet. Misys +51pc Banking software group, Misys, finished May with a flourish. After a dramatic few months saw bidders enter the fray and then walk away, Misys finally agreed to a £1.29bn takeover by Vista Equity Partners in March. With the deal complete, Misys left the London Stock Exchange on Friday, with its shares up 51pc from where they ended last year. Private equity firm Vista said in March that it would pay 350p-a-share for Misys, seeing off a bid from rival CVC, which pulled out of the race to buy the FTSE 250 business. The deal came after talks for an all-share merger between Misys and Switzerland's Temenos collapsed in March. Elementis +47pc The speciality chemicals group Elementis is enjoying a sharp increase in demand for its products in Asia and South America, which is offsetting economic uncertainty in Europe. The company, founded in Liverpool in 1844, makes coatings and chromium, and is benefiting from a boom in the oil and gas drilling sectors. For example, Elementis sells coatings additives for shale drilling and unconventional, high temperature, high pressure drilling. The group is also cash-rich. Last year the dividend was increased by 42pc and investors are ready for more returns after Elementis said in April that it is "in the process of reviewing the appropriate balance between cash reinvestment and shareholder returns." Dixons +45pc Consumers are hardly rushing out to spend money on expensive electrical gadgets this year. But the one thing they might splash out on is a big television ahead of the Euro 2012 football championship and the Olympics, traditionally a significant spark to the TV market. Dixons is probably best placed to win this spend, and investors have also been impressed by the new chief executive, Sebastian James, an old friend of David Cameron. More recently the owner of PC World and Curry's agreed a £300m refinancing package with its lenders, winning the company some much needed financial security and a vote of confidence. Many believe the shares are still cheap and could, despite almost zero consumer confidence, continue to do well this year. Bodycote +44pc Engineer Bodycote posted a 68pc rise in pre-tax profits to £76m for 2011, and its share price is following that growth. The group specialises in using heat treatment to improve the characteristics of metals, extending the life of machinery parts such as jet engine turbine blades. Bodycote, which was initially founded as a textile business, has found its skills in demand from the booming automotive and aerospace sectors and is benefiting from chief executive Stephen Harris's decision to focus on higher-margin contracts. Mr Harris is also expanding the company in the US, and has bought the heat-treatment business of Curtiss-Wright for more than £30m. Renishaw +43pc Precision engineer Renishaw saw its shattered shares jump 43pc in the first five months of this year. The recovery began in January when Renishaw, which makes and sells precision and inspection products for the healthcare and metrology industries, flagged a recovery in its key electronics market. At the time, Renishaw said that the continuing outlook for global investment for production systems in automotive, civil aviation, agriculture and energy looked increasingly favourable. Last month, Renishaw said it still expected to increase its profits for the year, despite a fall in third-quarter earnings, with activity in April ahead of last year.