What exactly? A measure of the number of people filing first-time claims for state unemployment insurance.
Source: Labor Department
Released when? Thursday at 8:30 a.m. Eastern. Data for week ended prior Saturday.
Market importance: Some. Occasionally moves market. Timely. Considered a good gauge of the condition of the labor market and good indicator of the tone of the employment report.
Other notes: Series is volatile and subject to big revisions. The four-week average is used to gauge the underlying trend in claims.