Mario Gabelli Stock Portfolio: Top 10 Stock Picks

9. AMETEK, Inc. (NYSE:AME)

GAMCO Investors’ Stake: $125 Million

AMETEK, Inc. (NYSE:AME) provides an interesting case study into the thought process behind the investments of Mario Gabelli. His fund first disclosed a stake in the company back in the third quarter of 2012. This position comprised 4.2 million shares but was sold off by the next quarter. A new position was then opened in the fourth quarter of 2013. This holding comprised 3.2 million shares. Since this disclosure, GAMCO Investors has steadily trimmed the stake in each quarter, leading up to the latest filings for the fourth quarter of 2025. These show that the fund owns more than 606,000 shares in the company, down 2.5% compared to filings for the third quarter of 2025.

A core part of the bull thesis for hedge funds with regards to AMETEK, Inc. (NYSE:AME) is the growth model. The company is a prolific acquirer of small to mid-sized niche technology leaders. In early 2026, CEO David Zapico reiterated the company’s commitment to deploying cash flows into acquisitions. Hedge funds are also attracted to the proprietary nature of AMETEK’s products. The company operates through two main segments: Electronic Instruments (EIG) and Electromechanical (EMG). Because many of their instruments are mission-critical, like aerospace sensors, medical power supplies, and laboratory equipment, but represent a small fraction of a customer’s total cost, AMETEK possesses significant pricing power.