A trio of investment management firms in Western New York has been included on CNBC's first-ever list of the top 100 fee-only wealth management firms in the United States. Sanderson Wealth Management, Sandhill Investment Management and Landmark Wealth Management secured the Nos. 30, 41 and 98 positions respectively on the CNBC list released in mid-May. Sanderson is the largest of the three firms, with $605 million in assets under management and more than 100 advisory clients. The nearly 13-year-old…