Bank of America has emerged as a vocal advocate for materials sector exposure heading into the latter half of 2026, arguing that the asset class deserves a prominent place in diversified portfolios alongside technology positions.

Market Context

The call comes against a backdrop of unprecedented infrastructure buildout tied to artificial intelligence development. Data center construction, semiconductor manufacturing expansion, and electric vehicle supply chains are all driving demand for commodities ranging from copper and aluminum to specialty chemicals and rare earth elements. Simultaneously, geopolitical tensions have intensified competition for critical mineral resources, with nations prioritizing domestic supply security over cost efficiency.

Analysis

Bank of America's strategy team is advocating what they characterize as a "barbell" approach to portfolio construction. On one end sits technology—particularly semiconductor and AI infrastructure names—and on the other sits materials producers positioned to supply the raw inputs this buildout requires. The thesis rests on several interlocking factors: AI capital expenditure commitments from major tech firms continue scaling upward; defense spending increases globally are driving demand for specialty metals and alloys; and a persistent U.S. housing shortage is sustaining structural demand for construction materials including steel, copper piping, and cement.

The geopolitical dimension carries particular weight in the analysis. Nations are increasingly treating access to critical minerals as a national security imperative rather than an economic consideration alone. This paradigm shift has translated into policy support—subsidies, tariffs, and strategic reserves—that could provide sustained demand tailwinds for domestic materials producers regardless of where commodity prices ultimately settle.

Key Numbers

- AI infrastructure spending projected to drive significant incremental copper demand through 2027

- Global defense budgets trending higher across NATO members and Indo-Pacific allies

- U.S. housing deficit estimated at several million units, sustaining long-term construction materials demand

- Critical mineral import dependency remains elevated for rare earth elements and lithium

What to Watch

Investors considering the Bank of America thesis should monitor quarterly earnings calls from major copper producers including Freeport-McMoRan (FCX) and Southern Copper Corporation (SCCO), steelmakers such as Nucor (NUE) and Steel Dynamics (STLD), and specialty chemical firms positioned in semiconductors and advanced manufacturing. Policy developments around the U.S. Section 232 steel tariffs and critical mineral subsidy programs merit close attention, as does any shift in AI capital expenditure guidance from the hyperscaler cohort.