A political stalemate in Greece rattled financial markets worldwide today, driving US stocks lower.

Motorola Mobility Holdings, the maker of mobile phones and cable set-top boxes that split off from the rest of Motorola in January, is struggling to continue its turnaround and find a stable foothold in the world of smartphones and tablets.

Yahoo co-founder Jerry Yang is stepping down as chief executive, ending a rocky reign marked by his refusal to sell the internet company to Microsoft for $48bn (€38bn) – more than triple Yahoo’s current market value.

Wall Street turned in a mixed performance today as investors watched the price of oil regain ground and decided to cash in some of their gains from the stock market’s big rally last week.

The Dow Jones industrial average set its fourth record close in two weeks today, finishing less than a point above its previous closing high.