2.41K calls and 2.04K puts traded on Nov 4, 2026, 4.45K contracts in total. Open interest was 14.29K contracts. Over the past 30 days, volume averaged 1.11K contracts per day. The CRL option volume chart shows volume by strike and expiration date.

Charles River Laboratories International IV rank is 14, so its 30-day implied volatility of 52.4% is near the bottom of its one-year range. Over the past year it ranged from 36.2% on Dec 29, 2025 to 150.8% on May 15, 2026. See the CRL implied volatility history for a longer view.

The Charles River Laboratories International put/call volume ratio was 0.85 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.55. The CRL open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Charles River Laboratories International options about one week from expiration was $328.02, close to the $326.43 close. The CRL max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 55.1%, options price a move of about ±$24.89 (±7.6%) over the next week, a range of roughly $301.54 to $351.32 from the Nov 4, 2026 close. The CRL expected move chart shows it for every expiration date.