COST earnings date, and what happened the last 4 times

Next report

Thu Dec 10

Quality Score today 10

After the close, in 44 days. Confirmed by the company.

COST closed higher after 2 of its last 4 reports. On average it closed +0.2% the session after a report.

The moment COST reports

Its figures, in plain words
How it moves after, beside its last four
Its Quality Score going in, and after

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What happened after COST's last 4 reports

COST's last 4 earnings reports
Reported	Score going in	Gap	Reaction	5 sessions
Sep 24, 20262026 · After close	3	-1.1%	+2.9%	+2.1%
May 28, 20262026 · After close	10estimated	-0.9%	-3.9%	-2.3%
Mar 5, 20262026 · After close	11estimated	-1.6%	+1.6%	+2.1%
Dec 11, 20252025 · After close	2estimated	-0.1%	0.0%	-3.0%

Sep 24, 2026, after the close: the next session COST opened -1.1% and closed +2.9%, and five sessions on it stood +2.1%. Its Quality Score going in was 3 (Below Average).
May 28, 2026, after the close: the next session COST opened -0.9% and closed -3.9%, and five sessions on it stood -2.3%. Its Quality Score going in was 10 (Average), estimated.
Mar 5, 2026, after the close: the next session COST opened -1.6% and closed +1.6%, and five sessions on it stood +2.1%. Its Quality Score going in was 11 (Above Average), estimated.
Dec 11, 2025, after the close: the next session COST opened -0.1% and closed 0.0%, and five sessions on it stood -3.0%. Its Quality Score going in was 2 (Below Average), estimated.

Across these 4 reports COST opened higher after 0 of 4 and closed higher after 2 of 4; on average it opened -0.9%, closed +0.2%, and stood -0.3% five sessions on. Its Quality Score is 10 today, against 3 going into its Sep 24, 2026 report.

Gap: where the stock opened the session after the report. Reaction: where that session closed. Both against the close before the report. The largest of the 4: -3.9% after the May 28, 2026 report. A score marked estimated was worked out afterwards from that day's prices and filings; Breakaway has recorded every score live since Sep 9 2026.

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Questions about COST's earnings

As of Oct 27, 2026: Costco Wholesale (COST): reports Thu Dec 10, after the close. COST closed higher after 2 of its last 4 reports. Its Quality Score is 10 (Average). Scores as of 12:12 AM ET, 15 minutes behind.

When is COST's next earnings date?

Reports Thu Dec 10, after the close, a date the company confirmed. COST closed higher after 2 of its last 4 reports. Past behavior, not a forecast.

Does COST report before or after the market?

COST reports Thu Dec 10, after the close. Its last 4 reports came after the close.

How did COST stock react to its last earnings report?

Sep 24, 2026, after the close: the next session COST opened -1.1% and closed +2.9%, and five sessions on it stood +2.1%.

Does COST stock usually go up after earnings?

COST closed higher after 2 of its last 4 reports. On average it closed +0.2% the session after a report, after opening -0.9%. Past behavior, not a forecast.

Costco Wholesale's page has its Quality Score, its chart, and its insiders' trades. Who reports this week: the earnings calendar.