2.29K calls and 58 puts traded on Nov 4, 2026, 2.35K contracts in total. Open interest was 44.58K contracts. Over the past 30 days, volume averaged 1.58K contracts per day. The ACAD option volume chart shows volume by strike and expiration date.

Acadia Pharmaceuticals IV rank is 17, so its 30-day implied volatility of 55.2% is near the bottom of its one-year range. Over the past year it ranged from 30.7% on Jul 1, 2026 to 177.4% on Oct 16, 2026. See the ACAD implied volatility history for a longer view.

The Acadia Pharmaceuticals put/call volume ratio was 0.03 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.85. The ACAD open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Acadia Pharmaceuticals options about one week from expiration was $19.78, 7.9% below the $21.49 close. The ACAD max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 42.1%, options price a move of about ±$1.25 (±5.8%) over the next week, a range of roughly $20.24 to $22.74 from the Nov 4, 2026 close. The ACAD expected move chart shows it for every expiration date.