By Benjamin Horney (October 10, 2014, 4:14 PM EDT) -- U.S. mutual fund giant Fidelity Investments, Actavis PLC's largest investor, has increased its stake in Allergan Inc. by about 2 million shares, and would be in favor of a potential merger between Actavis and Allergan, Reuters reported on Friday. Actavis, a New Jersey-based pharma powerhouse, has reportedly been pushing hard for a merger with the California-based Botox maker since rumors that Allergan was considering a sale sprouted earlier this week. Fidelity owned roughly 3.88 million Allergan shares as of June 30, which is before the stake increase took place, the report said. Allergan, which has continuously rejected takeover attempts from Valeant Pharmaceuticals International Inc. this past year — even going so far as to call a $53 billion offer "grossly inadequate" — would supposedly contemplate a takeover proposal if it valued the company at more than $200 per share, according to reports....