Shares of aviation, paints and oil marketing companies (OMCs) came under pressure in early trade on Monday as a sharp spike in crude oil prices following renewed military escalation between the United States and Iran weighed on sectors that are among the biggest consumers of petroleum products.

At around 9:30 am, the Sensex was down 633 points, or 0.82 percent, at 76,936.04, while the Nifty slipped 184 points, or 0.76 percent, to 24,022.45. India VIX jumped more than 9 percent, reflecting a sharp rise in market volatility.

InterGlobe Aviation (IndiGo) and Asian Paints shares were among the top three losers on the Nifty 50, highlighting investor concerns over the impact of higher crude prices on input costs and profitability.

IndiGo fell 2.3 percent to around Rs 5,189, making it one of the biggest drags on the benchmark index. Aviation companies are particularly sensitive to crude price movements because aviation turbine fuel (ATF), derived from crude oil, is their single largest operating expense. Sustained increases in oil prices can pressure margins unless airlines pass on higher fuel costs through fare hikes.

Paint makers also traded lower as crude derivatives are widely used in manufacturing paints and coatings. Asian Paints declined 1.6 percent, Berger Paints fell nearly 1 percent, Kansai Nerolac slipped around 0.5 percent, while Indigo Paints also traded in the red.

Oil marketing companies were under pressure as higher crude prices raise the cost of procuring crude oil and can compress refining and marketing margins if retail fuel price revisions lag. Bharat Petroleum Corporation (BPCL) fell 1.3 percent, Hindustan Petroleum Corporation (HPCL) declined 1.5 percent, and Indian Oil Corporation (IOC) lost 1.2 percent.

Tyre manufacturers also weakened as crude-linked raw materials such as synthetic rubber and carbon black account for a significant share of production costs. Apollo Tyres, JK Tyre and CEAT traded lower in early deals.

The selling in these sectors followed a surge in global crude prices after renewed hostilities between the United States and Iran over the weekend. Brent crude jumped above $79 a barrel after Iran said it had again closed the Strait of Hormuz following fresh missile and drone attacks, reviving fears of supply disruptions through one of the world's busiest oil shipping routes.

However, not all energy-linked stocks declined. Upstream oil producers benefited from the prospect of higher crude realisations. Oil and Natural Gas Corporation (ONGC) gained about 1.3 percent, while Oil India rose around 0.5 percent in early trade.

The weakness was also reflected in sectoral indices, with Nifty Auto falling 0.9 percent, Nifty Metal down 0.9 percent, and Nifty Oil & Gas slipping 0.3 percent, even as gains in upstream oil producers partly cushioned losses within the energy pack.