Regeneron Pharmaceuticals fell 0.44% to $759.24. Shares opened with a 0.90% gap up and reversed through the session and closed near the session low (16% of the day's range). It came 2 sessions after the Q2 2026 print. The move erased $367.4M of market value.

Regeneron Pharmaceuticals rose 3.29% to $762.63, on 1.5× average volume. This was largely stock-specific: the S&P 500 gained 0.72% while Healthcare peers (XLV) fell 0.59% that session, leaving about 3.0 points of the move unexplained by the market after adjusting for a 0.39 beta. Shares opened with a 1.83% gap down and reversed through the session, closed near the session high (95% of the day's range) and marked a 7th consecutive advance. It came 1 session after the Q2 2026 print. The move added $2.63B of market value.

Regeneron Pharmaceuticals rose 6.17% to $738.34, its biggest one-day gain in 9 months and a 2.9σ move against its 60-day volatility, on 1.9× average volume. This was largely stock-specific: the S&P 500 gained 1.68% while Healthcare peers (XLV) fell 1.64% that session, leaving about 5.5 points of the move unexplained by the market after adjusting for a 0.39 beta. Shares closed near the session high (96% of the day's range), reclaimed their 200-day moving average and marked a 6th consecutive advance. This was the first session after Q2 2026 results: EPS of $14.29 vs $10.16 expected (a beat) and revenue of $4.29B vs $3.82B (a beat). The move added $4.65B of market value. Historically, after 2.5σ-or-larger up days, Regeneron Pharmaceuticals returned -0.15% on average over the following 5 sessions (50% positive, n=12).

Regeneron Pharmaceuticals rose 4.20% to $695.18, its biggest one-day gain in 3 weeks and a 2.0σ move against its 60-day volatility. The move was broadly in line with its sector — the S&P 500 gained 0.24% while Healthcare peers (XLV) rose 2.36% the same session — so little of it was company-specific. Shares opened with a 1.46% gap up, closed near the session high (92% of the day's range) and marked a 4th consecutive advance. The move added $3.04B of market value.

Regeneron Pharmaceuticals fell 3.56% to $651.18, its biggest one-day drop in 1 month and a 1.6σ move against its 60-day volatility. This was largely stock-specific: the S&P 500 fell 0.12% while Healthcare peers (XLV) fell 0.51% that session, leaving about 3.0 points of the move unexplained by its sector. Shares closed near the session low (8% of the day's range) and lost their 20-day moving average. The move erased $2.60B of market value.