More specifically, GAMCO Investors was the largest shareholder of Strattec Security Corp. (NASDAQ:STRT), with a stake worth $8 million reported as of the end of September. Trailing GAMCO Investors was Ariel Investments, which amassed a stake valued at $2.6 million. Renaissance Technologies was also very fond of the stock, becoming one of the largest hedge fund holders of the company. In terms of the portfolio weights assigned to each position GAMCO Investors allocated the biggest weight to Strattec Security Corp. (NASDAQ:STRT), around 0.09% of its 13F portfolio.