Just joined today, 3 days left

Seizing a rebound in energy stocks, Sea should have bought two days earlier. I guessed that COST would drive low and go high, but it wasn't fast enough. Too bad $NRGU MicroSectors US Big Oil Index 3X Leveraged ETN (NRGU.US)$ $Sea (SE.US)$ $Costco (COST.US)$