In France, particularly in Burgundy, there are plenty of high quality négociants who "élèvent" and sell wine under their own name made from bought in grapes or bought in wine. Jadot, Bouchard P&F, Drouhin, Champy, Chanson, Louis Latour and Dominique Laurent spring to mind. Some of these also produce wines from their own vineyards and this can usually be seem on the label by added words, such as "Domaine des Héritiers de Louis Jadot", to take the example of a Beaune Couchereaux which I opened last weekend. I confess to having a slight prejudice in favour of such "domaine" wines but in the case of, say, Jadot there is no rational basis for it.
There are also a number of good négociants operating in a similar way in the Rhône valley, e.g. Guigal, Jaboulet, Delas, Perrin, Tardieu Laurent.
Outside these regions, not many quality négociants spring to mind. Hugel & Trimbach in Alsace are négociants but their best wines IMO are "domaine".
And, of course, the "grandes marques" in Champagne are négociants manipulants ("NM" at the bottom of the label) though some, e.g. Bollinger, use a lot of own grapes. There is a fashion amongst geeks for grower ("récoltant manipulant") Champagnes identifiable as such by the small letters "RM" at the bottom of the label. Some, e.g. Egly Ouriet, Pierre Moncuit, Larmandier Bernier, Selosse, etc., are very fine and sometimes better QPR than the grandes marques. However not many Champagne lovers

would turn down a glass of Bollinger, Krug, Roederer, Jacquesson, etc. just because they are not grower Champagnes.