Keybanc analyst Michael Turits downgraded Oracle Corp. from Overweight to Sector Weight. Patrick Walravens from JMP Securities maintained a Hold on Oracle. Stifel analyst Brad Reback reiterated a Hold and a price target of $87 on Oracle, implying a 5.1 percent downside. The re-rating follows Oracle’s plans to acquire Cerner Corp. in an all-cash transaction of $95 per share. Reback believes that…