Why did Alcoa (NYSE:AA) (ASX:AAI) shares plummet nearly 10% in a single day?

Alcoa shares suffered their largest one-day drop in 14 months due to a double blow from natural disasters and geopolitical conflict. The company revealed a $US30 million hit from Tropical Cyclone Narelle in Western Australia alongside soaring energy costs and supply chain chaos linked to the Middle East war.

How did Tropical Cyclone Narelle impact Alcoa’s Australian operations?

The cyclone disrupted regional natural gas supplies in Western Australia, forcing a partial shutdown of Alcoa’s Pinjarra alumina refinery. This supply disruption exacerbated existing operational instability at the facility, resulting in a direct US$30 million financial hit to its Australian operations.

What does the closure of the Strait of Hormuz mean for Alcoa?

The closure of the Strait of Hormuz has triggered severe supply chain chaos and caused fuel and electricity prices to surge over the past three months.

Will Alcoa (NYSE:AA) be profitable this quarter?

While Alcoa has benefited from high aluminium prices globally this year, its crucial alumina segment is projected to be "underwater" and unprofitable this quarter. Chief Financial Officer Molly Beerman confirmed that skyrocketing production and energy costs have wiped out profit margins for the division, reversing its status as a primary profit driver.

What are the key cost blowouts hurting Alcoa's balance sheet right now?

Alcoa is facing two major unexpected expenses: a $US30 million increase in production costs at its Pinjarra refinery in Australia due to storm damage, and an additional $US15 million fuel cost blowout at its São Luís refinery in Brazil.

Image for illustrative purposes only. Not a real photo.

Alcoa shares plummet amid cyclone, geopolitical impacts

Written by Heidi Cuthbert Published Jun 11, 2026, 4:46 AM

Shares in Alcoa (ASX:AAI) (NYSE:AA) have plummeted nearly 10%, marking their largest one-day drop in 14 months, as the aluminium giant faces a double blow from natural disasters and escalating geopolitical conflict.

The New York Stock Exchange-listed company revealed a US$30 million hit to its Western Australian operations after Tropical Cyclone Narelle disrupted regional natural gas supplies.

The disruption forced a partial shutdown and exacerbated operational instability at its Pinjarra alumina refinery.

The business is battling severe upheavals in the Middle East. Speaking at the Wells Fargo Industrials & Materials Conference, CFO Molly Beerman warned that the company’s alumina division is being "hammered" by soaring energy prices and supply chain chaos, particularly following the closure of the Strait of Hormuz.

"Our alumina segment is very pressured right now," Beerman said. "The segment as a whole will be underwater."

As one of the world's largest suppliers of seaborne alumina—the raw material refined from bauxite to create aluminium—Alcoa is heavily exposed to the conflict.

The company’s refineries typically ship alumina to smelters in the Persian Gulf, a region now facing intense instability.

Energy-intensive refining processes are grappling with surging fuel and electricity costs, including an unexpected US$15 million cost blowout at Alcoa's São Luís refinery in Brazil.

The downturn marks a stark reversal for the segment, which was a primary profit driver in 2025.

While Alcoa has benefited from high metal prices this year, escalating energy costs are projected to drag the key division into unprofitability this quarter.

Alcoa shares plummet amid cyclone, geopolitical impacts

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