Pre-Market Movers Stocks moving in the pre-market included: Costco (NYSE: COST ) shares gained 0.39 percent pre-market as the company reported that same-store sales rose 6.0 percent in June vs. an expected gain of 5.4 percent.Net sales rose 8 percent to $9.92 billion in June. However, he did close with slightly hawkish statements by saying that inflation is low due to transitory factors and should moderate back towards the medium-term target. Spanish 10-year government bond yields fell 8 basis points to 4.73 percent as Prime Minister Rajoy is set to roll out new taxes, according to Bloomberg.