SNY ▼ -2.3% - Sanofi $SNY SNY - Sanofi and Keke Palmer team up to urge parents to help protect babies from serious RSV with BEYFORTUS® Sanofi shares fell 2.3% today despite the company announcing a new campaign with Keke Palmer to promote BEYFORTUS®, its RSV preventive treatment for infants. The stock decline appears unrelated to the marketing initiative itself, suggesting broader market headwinds or other factors drove the intraday move. 08-SEP-2026 08:01 AM ET