Option activity is usually called unusual when a contract trades much more volume than its open interest, which can mean traders are opening new positions.

On Nov 4, 2026, Acadia Pharmaceuticals options traded 2.35K contracts against 44.58K open, a volume to open interest ratio of 0.05, well above its 20-day average. The table above lists the contracts with the highest ratios.

Calls made up 97.5% of Acadia Pharmaceuticals option volume on Nov 4, 2026, a put/call ratio of 0.03, so calls outnumber puts. The ACAD option volume chart shows calls and puts by strike.

Acadia Pharmaceuticals Inc is a biopharmaceutical company focused on turning scientific promise into making a difference for underserved neurological and rare disease communities around the world.