As of 9:50 AM, the stock is down 1.5% at 361.1 euros, compared to a 0.7% dip for the CAC 40 at the same time.

In a research note published overnight, Jefferies stated it expects the robust sector data compiled by Nielsen for the first quarter—which shows L'Oréal outperforming its main rivals in both Europe and North America—to be reflected in the group's first-quarter revenue.

De-rating risk amid decelerating growth

The U.S. broker expects like-for-like sales growth of 3.7% for the period, but anticipates average organic growth of 4.1% over the next two years. While in line with 2025 estimates, this figure remains below the company's historical performance levels.

This slowdown risks triggering a de-rating of the stock, Jefferies warns. The firm fears the forward P/E ratio could revert to around 22x, down from 26x currently, prompting it to slash its price target from 350 to 326 euros.

The broker maintains its "Underperform" rating on the stock.

L'Oréal is scheduled to report its first-quarter revenue on April 22 after the market close.