SPRO earnings date, and what happened the last 4 times

Next report

Thu Nov 12

Quality Score today 0

After the close, in 17 days. Expected: the company has not confirmed it.

SPRO closed higher after 2 of its last 4 reports. On average it closed +3.6% the session after a report.

The moment SPRO 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 SPRO's last 4 reports

SPRO's last 4 earnings reports
Reported	Score going in	Gap	Reaction	5 sessions
Aug 12, 20262026 · After close	-4estimated	+5.9%	+4.2%	+3.4%
May 13, 20262026 · After close	11estimated	0.0%	+13.1%	+7.8%
Mar 26, 20262026 · After close	10estimated	-3.0%	-1.7%	+2.5%
Nov 13, 20252025 · After close	1estimated	-2.0%	-1.2%	-7.4%

Aug 12, 2026, after the close: the next session SPRO opened +5.9% and closed +4.2%, and five sessions on it stood +3.4%. Its Quality Score going in was -4 (Poor), estimated.
May 13, 2026, after the close: the next session SPRO opened 0.0% and closed +13.1%, and five sessions on it stood +7.8%. Its Quality Score going in was 11 (Above Average), estimated.
Mar 26, 2026, after the close: the next session SPRO opened -3.0% and closed -1.7%, and five sessions on it stood +2.5%. Its Quality Score going in was 10 (Average), estimated.
Nov 13, 2025, after the close: the next session SPRO opened -2.0% and closed -1.2%, and five sessions on it stood -7.4%. Its Quality Score going in was 1 (Below Average), estimated.

Across these 4 reports SPRO opened higher after 1 of 4 and closed higher after 2 of 4; on average it opened +0.2%, closed +3.6%, and stood +1.6% five sessions on. Its Quality Score is 0 today, against -4 going into its Aug 12, 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: +13.1% after the May 13, 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 SPRO's earnings

As of Oct 26, 2026: Spero Therapeutics (SPRO): expected to report Thu Nov 12, after the close. SPRO closed higher after 2 of its last 4 reports. Its Quality Score is 0 (Below Average). Scores as of 11:11 PM ET, 15 minutes behind.

When is SPRO's next earnings date?

Expected to report Thu Nov 12, after the close, a date Breakaway expects from the company's usual timing; the company has not confirmed it. SPRO closed higher after 2 of its last 4 reports. Past behavior, not a forecast.

Does SPRO report before or after the market?

SPRO is expected to report Thu Nov 12, after the close. Its last 4 reports came after the close.

How did SPRO stock react to its last earnings report?

Aug 12, 2026, after the close: the next session SPRO opened +5.9% and closed +4.2%, and five sessions on it stood +3.4%.

Does SPRO stock usually go up after earnings?

SPRO closed higher after 2 of its last 4 reports. On average it closed +3.6% the session after a report, after opening +0.2%. Past behavior, not a forecast.

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