Jeremy Grantham

Jeremy Grantham co-founded GMO in 1977 and built it into one of the most respected global asset management firms, overseeing tens of billions in client assets. For commodity and mining investors, Grantham matters for two reasons: his firm's deep research on long-term resource scarcity trends, and his macro calls on market bubbles that directly affect when capital flows into — or flees from — natural resource equities.

Grantham's most important contribution to resource investing is GMO's seven-year asset class forecasts, which for years consistently ranked commodities and timberland among the highest-expected-return asset classes. He was an early and vocal advocate for investing in agriculture, raw materials, and productive land, arguing that a growing global middle class would strain finite resources. His 2011 thesis that we had entered a permanent shift in commodity prices — driven by decades of underinvestment in supply — played out across the mining sector through the 2010s.

His approach is rooted in mean reversion: asset prices, profit margins, and valuation multiples all eventually return to their long-term averages. When valuations stretch too far, Grantham labels them bubbles and positions defensively. He has publicly identified four "super bubbles" in his career — the 1989 Japanese asset bubble, the 2000 dot-com bubble, the 2006 housing bubble, and the current US equity market — each marked by extreme valuations followed by severe corrections. For mining investors, the relevance is direct: when broad equities correct, capital often rotates into hard assets and commodities as safe-haven stores of value.

Grantham's current focus is climate change, which he sees as the defining investment challenge of the coming decades. Through the Grantham Foundation for the Protection of the Environment, he funds research into decarbonization technologies and resource efficiency. This focus connects directly to the metals and mining sector: the energy transition requires copper, lithium, nickel, cobalt, and rare earth elements at scales that current mines cannot meet. Investors who follow Grantham's framework watch for the intersection of his climate advocacy and the materials demand it implies.

Mining investors should pay attention to Grantham's macro framework even though he is not a sector stock-picker. His calls on broad market direction, resource scarcity, and capital rotation help time exposure to commodity equities. When Grantham warns of a super bubble, resource investors note that the post-bubble environment historically favors tangible assets over financialized ones.