Peel Hunt has reiterated its buy recommendation and 650p target price for chip designer ARM Holdings, saying that the stock is a 'must-have' following its investor day yesterday."Rarely have we seen such an attractive investment case as that provided by ARM yesterday. Having lost some marketing ground to Intel in recent weeks, ARM gave a compelling account of how it sees its markets developing over the next five years. Our conclusion: ARM is a must-have stock and recent weakness has created an ideal entry point," said analyst Paul Morland.Jefferies may have retained its hold rating and 33p target price for telecoms group Cable and Wireless Communications, but has said that its full-year results announced Thursday give more stability in the outlook for the current year.Earnings before interest, tax, depreciation and amortisation (EBITDA) for the year ended March 31st came in at $901m, some 2% ahead of consensus forecasts. With EBITDA expected to be unchanged in the fiscal year ending 2013, the broker says that it "reflects encouraging developments in Jamaica telecom legislation".Panmure Gordon has upgraded its rating for food wholesaler Booker from hold to buy after the group substantially raised its dividend for the year to March 23rd."Booker's operating numbers were in line with our expectations, but we are taking the 39% hike in the final dividend as a strong positive signal," said analyst Philip Dorgan in a research note. He said that the increase suggests that management is confident that it has control "of all the levers for growth".The broker's upgrade to buy also comes after a recent dip in the share price which saw it slip below its 81p target price.BC