Citigroup has maintained its 'sell' rating for UK lender Royal Bank of Scotland (RBS) and has slashed its profit forecasts for the company citing weak earnings momentum.The broker said that RBS remains its least-preferred UK bank "based on the shareholder structure, ongoing political and regulatory uncertainty, and a weak medium-term return potential relative to peers".UBS has cut its recommendation for precious metals group Fresnillo from 'buy' to 'neutral' following the stock's recent strong performance.In August alone, the share price rose 27%, outperforming a 17% increase in the silver price and a 7% rise in gold. The valuation is now looking "stretched" and less attractive after the stock's recent run. The shares are trading at an "expensive" 36 times forward earnings, compared with its historical average price-to-earnings multiple of 21.Credit Suisse has reiterated its 'outperform' rating and 350p target price for telecoms group BT ahead of the second-quarter update due next month, a 'key' quarter for the company."We see BT's Q2 update as the first chance to assess the potential impact (direct & indirect) of BT's content strategy on its underlying business. As a result key fibre and line loss KPIs are likely to prove more interesting than the Q2 financials."Galvan Research has kept its positive stance on utilities group National Grid, saying it sees strong upside heading towards the end of 2013."The July guidance from National Grid provided ample fundamental affirmation to underpin the positive message from the general share price uptrend," said Thomas Light, Senior Analyst at Galvan. He expects the share to rebound back to its best levels of the year.BC