1. A method of polymerizing an olefin monomer to make a first polyolefin composition comprising a first polyolefin polymer, the method comprising steps (A) to (C): (A) contacting a solution of a first alkane-soluble non-metallocene precatalyst dissolved in an alkane solvent with an activator so as to make a first trim catalyst comprising a first alkane-soluble non-metallocene catalyst; (B) feeding the first trim catalyst into a polymerization reactor; and (C) polymerizing the olefin monomer with the first trim catalyst in the polymerization reactor; thereby making the first polyolefin composition comprising the first polyolefin polymer; wherein the first alkane-soluble non-metallocene precatalyst is characterized by solubility in hexanes containing at least 60 weight percent n-hexane of at least 0.10 weight percent, based on total weight of the first alkane-soluble non-metallocene precatalyst and hexanes, measured using Solubility Test Method.
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