US stocks climbed back close to record levels Thursday as tech, materials, and energy companies all notched big gains. Cisco Systems led the tech sector higher with better-than-expected earnings. Energy stocks rose as oil prices rebounded following two days of losses. So far in February, stocks have logged big gains, after slumping to their worst month in a year in January on worries about the global economy. Reports this month have shown earnings are still growing and that the US economy appears to be maintaining its recovery as hiring picks up. Oil prices rose as Royal Dutch Shell’s CEO said he expects crude demand will grow.