BUZZ-Top of the Street: Rio Tinto, Abertis, Mediaset, DB

A round-up of notable broker activity this morning from Europe's top-ranked* analysts:

** Rio Tinto (Hanover: CRA1.HA - news) : Citigroup (NYSE: C - news) raises to "buy" despite weak Q1; stock upgrade driven by share price selloff on the back of recent iron ore weakness, says broker

** Antofagasta (Other OTC: ANFGF - news) : Investec (LSE: INVP.L - news) raises to "buy", saying that with the ongoing reductions in copper surpluses and limited future supply growth, co stands to gain given that its share price correlates strongly to the metal price

** Deutsche Bank (IOB: 0H7D.IL - news) cuts Abertis (Amsterdam: IF6.AS - news) to "hold", seeing small upside from current levels after a rally in the shares -- co has the lowest no of buy ratings since Dec (Shanghai: 600875.SS - news) . 2015

** European steelmakers are set to report robust Q1 results, says Jefferies

5-star rated Jefferies analyst Seth Rosenfeld is bullish on Voestalpine (IOB: 0MKX.IL - news) , ups to "buy" on leading contract exposure, preferential raw materials purchasing and leading exposure to recovering O&G

** Mediaset (LSE: 0NE1.L - news) : Barclays (LSE: BARC.L - news) cuts to "underweight", citing scepticism on 2020 targets and the uncertainty around Vivendi’s stake

** Deutsche Bank: Barclays reinstates with "equal weight", saying that the work on capital is not quite over: "the need to part-sell the asset management unit confirms the ongoing pressure", adds broker

(*Analyst rankings from Thomson Reuters StarMine. Scale is from 1-star to 5-star with 5 being best. Analysts ranked on earnings accuracy as well as relative performance of recommendations over trailing 12-month & 24-month periods)