BUZZ — NatWest rises after Barclays lifts rating to overweight from equalweight
* Shares of British lender NatWest up 3% at 673 p — stock is top gainer on FTSE 100 * Barclays upgrades stock to "overweight" from "equal-weight" and raises target price to 850p from 740p * NatWest's leading rates gearing leaves it best placed among UK peers to monetise a steeper curve, while manageable funding costs a