Constantine Karayannopoulos

Constantine (Costa) Karayannopoulos is a professional engineer who spent more than two decades at the centre of the rare earths industry — the 17 metallic elements that go into permanent magnets, electric vehicles, wind turbines, and defence systems. He is best known as the former president, CEO, and chairman of Neo Performance Materials (TSX: NEO), one of the few rare earth processing and magnetics producers operating outside China. For resource investors, his career is a case study in the part of the supply chain where most Western rare earth projects struggle: separation and processing — the chemical steps that turn ore into usable oxides, metals, and magnets — rather than mining.

Karayannopoulos spent more than 20 years with Neo and its predecessor companies, rising through senior operating roles, including chief operating officer, to chief executive. As CEO of Neo Material Technologies, he built the Toronto-listed company into a leading processor of rare earths and rare metals and completed its US$1.3-billion acquisition by Molycorp in June 2012. He then joined Molycorp's board as vice chairman, served as its interim president and CEO from December 2012, and chaired the board through Molycorp's 2015 bankruptcy restructuring. When Neo's assets emerged under new ownership as Neo Performance Materials, he chaired the new company from 2016, returned as president and CEO in July 2020, led its listing on the Toronto Stock Exchange in December 2021, and retired in July 2023.

His approach reflects an operator's lens. In rare earths, he treats separation and metals production — not mine construction — as the decisive test of whether a project can create value, because that is where China's advantage and most technical risk sit. He made the same judgment in lithium, co-founding Neo Lithium, whose 3Q brine project (lithium dissolved in salt-flat brines) in Catamarca, Argentina, drew an 8% strategic investment from battery maker CATL in 2020 before China's Zijin Mining acquired the company in a roughly C$960-million all-cash deal completed in January 2022. He has also been direct about geopolitics, telling The Globe and Mail after Beijing restricted exports of rare earth processing technology in 2023 that China had discouraged such exports for years.

Today he works where rare earth project development meets investor education. He delivered a master class on investing in the rare earth sector for Bloor Street Capital's Virtual Rare Earth Conference, joined Mont Royal Resources' inaugural advisory board in April 2026 to guide the Ashram rare earth and fluorspar project in Nunavik, Quebec, and serves in an advisory role at Appia Rare Earths & Uranium. He sits on the advisory board of the University of Toronto's Department of Chemical Engineering and Applied Chemistry, where he earned his BASc and MASc. Following his talks and commentary offers investors a grounded read on processing economics, Chinese policy, and how a veteran operator judges rare earth projects.