No, company would have to split itself (create separated business entity) so you would have to sell your competing part of the company.
Such a change can also solve problem of companies using their dominant/monopolistic position in one business area to get unfair advantage in another.
> As an investor I definitely want to own companies that compete because I don't know which one is going to prevail.
That's the problem article describes! Such behavior reduces competition and hurts customers:
>> This line of research began with a 2014 paper about competition among U.S. airlines that quietly shook the fund industry and the antitrust world. José Azar, an economist at the University of Navarra in Barcelona, along with Martin Schmalz and Isabel Tecu, showed that airline ticket prices were 3% to 7% higher because big funds owned stakes in so many airlines.