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Stressor‐evoked cardiovascular reactivity, trait positive emotionality, and negative emotionality are all associated with cardiovascular disease. It is unknown, however, whether cardiovascular reactivity may constitute a pathway by which trait positive or negative emotionality relates to disease risk. Accordingly, this study modeled the cross‐sectional relationships between trait positive and negative emotionality, stressor‐evoked cardiovascular reactivity, and severity of a subclinical vascular marker of cardiovascular risk, carotid artery intima‐media thickness (CA‐IMT). The sample consisted of healthy, midlife adults free from clinical cardiovascular disease (N = 286; ages 30–54; 50% female). Trait positive and negative emotionality were measured by three questionnaires. Heart rate and blood pressure reactivity were assessed across three stressor tasks. CA‐IMT was assessed by ultrasonography. Latent factors of …