As of 9:50 AM, the shares are down 1.5% at 361.1 euros, compared to a 0.7% decline 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 competitors 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 anticipates like-for-like sales growth of 3.7% for the period. However, it forecasts average organic growth of 4.1% over the next two years, in line with 2025 estimates but below the company's historical performance levels.

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

Its rating on the stock remains at "Underperform".