I investigate capital market consequences of an increase in prescribed timeliness of firms' mandatory disclosure of material events. Specifically, I examine an SEC regulatory change that accelerates the Form 8-K filing deadline and classifies 8-Ks as likely to be constrained or unconstrained by the increase in prescribed timeliness. After the regulatory change, firms filing constrained 8-Ks exhibit increases in information asymmetry between investors and investor disagreement at the 8-K filing date relative to firms filing unconstrained 8-Ks. Moreover, the relative increases in information asymmetry and investor disagreement for firms filing constrained 8-Ks appear to be attributable to a decline in the length of and quantitative information included in 8-K disclosures. My findings shed light on the costs of a prescriptive approach to enhanced disclosure timeliness of ongoing disclosure.

Data Availability: Data are available from public sources cited in the text.

JEL Classifications: D82; D83; G18; M41.

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