Senior executives, directors, and major investors from the world’s largest fertiliser and grain companies have sold shares worth more than $66 million (£49 million) during price hikes linked to the Iran war, DeSmog can reveal.

Since the outbreak of the conflict in February, provoked by a U.S.-Israeli bombing campaign in Iran, fertiliser prices have increased by almost 45 percent – leading wheat producers in Australia to pare back planting, and some UK farmers to warn they may not sow for the summer season, risking soaring global grain prices.

The increased costs come after Iran blocked the Strait of Hormuz, a key shipping route. Around one-third of the world’s fertiliser, 20 percent of liquefied natural gas, and 25 percent of seaborne oil usually passes through the strait. The vast majority of chemical fertilisers are made from fossil fuels.

DeSmog’s new analysis found that insiders at three firms – fertiliser giants CF Industries and Nutrien, and grain company Archer Daniels Midland – have sold shares worth tens of millions since the outbreak of the conflict.

As commodity prices have increased, so have the share prices of the world’s largest fertiliser and grain companies. In March, Nutrien saw its share value grow by over 50 percent, and CF Industries by nearly 40 percent. Although grain company shares have increased less markedly, they have also shown an upward trend.