Majestic Oil v. Certain Underwriters at Lloyd’s is an insurance coverage case in which the key issue is what caused a roof to leak. The plaintiff’s expert prepared a second report that added analysis of certain weather data; he characterized it as a permissible supplement to his original report, while the defense moved to strike it as containing an impermissible new opinion after the expert-report deadline.

The Fifth Circuit reversed the trial court’s ruling that struck the new report, remanding for more fulsome consideration of all four factors identified by Fed. R. Civ. P. 37(c)(1): “(1) the explanation for the failure to identify the [information]; (2) the importance of the [information]; (3) potential prejudice in allowings the timeliness of an expert report and the [information]; and (4) the availability of a continuance to cure such
prejudice.” No. 21-20542 (March 17, 2023, unpublished).

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