BIIB earnings date, and what happened the last 4 times

Next report

Wed Oct 28

Quality Score today 14

Before the open, in 2 days. Confirmed by the company.

BIIB closed higher after 4 of its last 4 reports. On average it closed +4.4% the session after a report.

The moment BIIB 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 BIIB's last 4 reports

BIIB's last 4 earnings reports
Reported	Score going in	Gap	Reaction	5 sessions
Jul 29, 20262026 · Before open	6estimated	+2.4%	+1.8%	+1.4%
Apr 29, 20262026 · Before open	8estimated	-0.1%	+6.0%	+3.1%
Feb 6, 20262026 · Before open	14estimated	+0.9%	+8.5%	+5.5%
Oct 30, 20252025 · Before open	7estimated	-5.3%	+1.2%	+3.8%

Jul 29, 2026, before the open: that session BIIB opened +2.4% and closed +1.8%, and five sessions on it stood +1.4%. Its Quality Score going in was 6 (Average), estimated.
Apr 29, 2026, before the open: that session BIIB opened -0.1% and closed +6.0%, and five sessions on it stood +3.1%. Its Quality Score going in was 8 (Average), estimated.
Feb 6, 2026, before the open: that session BIIB opened +0.9% and closed +8.5%, and five sessions on it stood +5.5%. Its Quality Score going in was 14 (Above Average), estimated.
Oct 30, 2025, before the open: that session BIIB opened -5.3% and closed +1.2%, and five sessions on it stood +3.8%. Its Quality Score going in was 7 (Average), estimated.

Across these 4 reports BIIB opened higher after 2 of 4 and closed higher after 4 of 4; on average it opened -0.5%, closed +4.4%, and stood +3.4% five sessions on. Its Quality Score is 14 today, against 6 going into its Jul 29, 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: +8.5% after the Feb 6, 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 BIIB's earnings

As of Oct 26, 2026: Biogen (BIIB): reports Wed Oct 28, before the open. BIIB closed higher after 4 of its last 4 reports. Its Quality Score is 14 (Above Average). Scores as of 11:11 PM ET, 15 minutes behind.

When is BIIB's next earnings date?

Reports Wed Oct 28, before the open, a date the company confirmed. BIIB closed higher after 4 of its last 4 reports. Past behavior, not a forecast.

Does BIIB report before or after the market?

BIIB reports Wed Oct 28, before the open. Its last 4 reports came before the open.

How did BIIB stock react to its last earnings report?

Jul 29, 2026, before the open: that session BIIB opened +2.4% and closed +1.8%, and five sessions on it stood +1.4%.

Does BIIB stock usually go up after earnings?

BIIB closed higher after 4 of its last 4 reports. On average it closed +4.4% the session after a report, after opening -0.5%. Past behavior, not a forecast.

Biogen's page has its Quality Score, its chart, and its insiders' trades. Everyone reporting beside it: this week's earnings.