(Bloomberg) — Samsung Electronics Co. shares surged Monday after South Korea’s biggest company announced a surprise plan late Friday to buy back about 10 trillion won ($7.2 billion) of its own stock over the next year. Most Read from BloombergIn Cleveland, a Forgotten Streetcar Bridge Gets a Long-Awaited LiftAmtrak Wins $300 Million to Fix Its Unreliable NJ-to-NYC ServiceA Bug’s Eye View of Mexico City’s Modernist ArchitectureNYC Congestion Pricing Plan With $9 Toll to Start in JanuaryZimbabwe