Fight over board that controls Avantax coming to a head A struggle for seats on the board of Blucora Inc., which owns the independent broker-dealer Avantax Investment Services Inc., is heading for a showdown. Blucora has purchased two broker-dealers in half-a-dozen years to expand into the wealth management business. April 19, 2021 2 MINS A struggle for seats on the board of Blucora Inc., which owns the independent broker-dealer Avantax Investment Services Inc., is heading for a showdown as shareholders on Wednesday will vote on two separate slates of board members, with a larger RIA shareholder pushing for an overhaul of Blucora’s board membership and the election of its group of four candidates.