TULSA, Okla.--(BUSINESS WIRE)--Tulsa based Argonaut Private Equity announces final close of Argonaut Private Equity Fund IV at $400 Million. : TULSA, Okla.--(BUSINESS WIRE)--Argonaut Private Equity, a Tulsa, Oklahoma-based private equity firm announced today the final closing of Argonaut Private Equity Fund IV (“APE IV” or the “Fund”), a $400 million fund focused on pursuing disciplined investments across the industrials, manufacturing and energy services and products sectors in Middle America. The Fund reached its hard cap of $400 million and is off to a strong start with over $120 million of equity capital deployed across four portfolio companies.