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The Post-Movement Beta (13-30Hz) Rebound (PMBR) is a motor cortex specific response that follows the termination of a movement, reflecting various aspects of performance. While widely researched in limb-movement tasks, the PMBR has not been extensively studied in speech. This study used magnetoencephalography (MEG) to characterize the PMBR response in five healthy adults as they spoke five phrases varying in articulatory complexity. Source localization was conducted using beamforming, and the PMBR was evaluated with respect to jaw movement offset. Groupwise results revealed that the most complex phrase elicited a stronger PMBR than the least complex phrase. The PMBR was found bilaterally, but with a stronger response in the language-dominant hemisphere. These findings provide preliminary evidence that the PMBR could be used as an index of articulatory complexity during speech production. The PMBR may even serve as a useful neurophysiological feature for clinical speech applications.