Howard Weil analyst Blake Fernandez has lowered his rating on shares of Delek US Holdings to 'market perform' from a Focus List 'buy.' But he also has raised his price target for Brentwood-based Delek to $28 from $22, so that counts for something. Delek (Ticker: DK) is up more than 50 percent in the past three months and is changing hands this morning around $24.