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Company Profile

When does Biogen Inc. (BIIB) report earnings? On Oct 28, 2026, before the open

None of its last 12 announcements carries a time on the filing, so there is no way to say which session they fell in. Each one comes from the 8-K with item 2.02 that Biogen filed with the SEC, paired with the 10-Q or 10-K for that same quarter: 66 quarters since Jul 16, 2009, and every row links to its filing.

Next announced date: Oct 28, 2026, before the open. It comes from the company through the public Nasdaq calendar, not from the SEC: it is a scheduled date and companies do move it. Everything else on this page already happened, with its filing attached.

Day of the weekWednesday5 of 12
After the quarter ends31 daysmedian over the window
Lead over the 10-Q/10-K0 sessionsmedian over the window
Quarters on file66since Jul 16, 2009

The latest, still without a report

They are this company's most recent 8-K filings with item 2.02 and they do not yet have their 10-Q or 10-K behind them, so there is no way to say which quarter they belong to: they do not enter the figures above or the table, and for the same reason one of them might not be an earnings announcement at all (some companies use this same item for production figures or monthly sales).

The last 20 quarters, one by one

"Lead": trading sessions between the announcement and the full quarterly report to the SEC (10-Q, or 10-K at fiscal year end). For Biogen, a median of 0 sessions over the last 12 quarters, i.e. the same market day.

AnnouncementDayTime (NY)SessionQuarter endedSEC reportLeadFiling
Apr 29, 2026Wednesdayno time on the filingMar 31, 202610-Q · Apr 29, 20260 sessions8-K
Feb 6, 2026Fridayno time on the filingDec 31, 202510-K · Feb 6, 20260 sessions8-K
Oct 30, 2025Thursdayno time on the filingSep 30, 202510-Q · Oct 30, 20250 sessions8-K
Jul 31, 2025Thursdayno time on the filingJun 30, 202510-Q · Jul 31, 20250 sessions8-K
May 1, 2025Thursdayno time on the filingMar 31, 202510-Q · May 1, 20250 sessions8-K
Feb 12, 2025Wednesdayno time on the filingDec 31, 202410-K · Feb 12, 20250 sessions8-K
Oct 30, 2024Wednesdayno time on the filingSep 30, 202410-Q · Oct 30, 20240 sessions8-K
Aug 1, 2024Thursdayno time on the filingJun 30, 202410-Q · Aug 1, 20240 sessions8-K
Apr 24, 2024Wednesdayno time on the filingMar 31, 202410-Q · Apr 24, 20240 sessions8-K
Feb 13, 2024Tuesdayno time on the filingDec 31, 202310-K · Feb 14, 20241 session8-K
Nov 8, 2023Wednesdayno time on the filingSep 30, 202310-Q · Nov 8, 20230 sessions8-K
Jul 25, 2023Tuesdayno time on the filingJun 30, 202310-Q · Jul 25, 20230 sessions8-K
Apr 25, 2023Tuesdayno time on the filingMar 31, 202310-Q · Apr 25, 20230 sessions8-K
Feb 15, 2023Wednesdayno time on the filingDec 31, 202210-K · Feb 15, 20230 sessions8-K
Oct 25, 2022Tuesdayno time on the filingSep 30, 202210-Q · Oct 25, 20220 sessions8-K
Jul 20, 2022Wednesdayno time on the filingJun 30, 202210-Q · Jul 20, 20220 sessions8-K
May 3, 2022Tuesdayno time on the filingMar 31, 202210-Q · May 3, 20220 sessions8-K
Feb 3, 2022Thursdayno time on the filingDec 31, 202110-K · Feb 3, 20220 sessions8-K
Oct 20, 2021Wednesdayno time on the filingSep 30, 202110-Q · Oct 20, 20210 sessions8-K
Jul 22, 2021Thursdayno time on the filingJun 30, 202110-Q · Jul 22, 20210 sessions8-K

The table shows the 20 most recent quarters. All 66 are in the CSV, with the same columns and one row per quarter.

Download all 66 BIIB quarters as CSV → Free, no account.

How Biogen shares moved on their latest earnings

Reported EPS beat the consensus estimate in 4 of the 4 quarters with an estimate.

AnnouncementSessionWindow, close to closeBIIBSPYEPS actual / expected
Apr 29, 2026no time on the filingno time: unknown which close caught it3.57 / 2.89 (+23.6%)
Feb 6, 2026no time on the filingno time: unknown which close caught it1.99 / 1.62 (+23.2%)
Oct 30, 2025no time on the filingno time: unknown which close caught it4.81 / 3.88 (+23.9%)
Jul 31, 2025no time on the filingno time: unknown which close caught it5.47 / 3.88 (+41%)
May 1, 2025no time on the filingno time: unknown which close caught it
Feb 12, 2025no time on the filingno time: unknown which close caught it
Oct 30, 2024no time on the filingno time: unknown which close caught it
Aug 1, 2024no time on the filingno time: unknown which close caught it

Split-adjusted closes and EPS with its estimate, from Yahoo Finance. It already happened: it does not anticipate the next announcement.

Where each number comes from

From the 8-K with item 2.02 ("Results of Operations and Financial Condition") that Biogen filed on EDGAR, the SEC's public database; only those with their 10-Q or 10-K behind them count, so other 8-Ks with the same item (production figures, monthly sales) stay out. No time is published for this company: its EDGAR acceptance stamp and the official header of its filings disagree, so there is no way to know whether the stamp is in New York time or UTC, and the two readings are four or five hours apart —enough to change session—. The dates are firm; the time and the session are deliberately left empty rather than filled in with a guess.

What this data does not know

  • The exact time of the press release: the 8-K reaches EDGAR minutes or hours later, so any 8-K time is an upper bound. The session says which one the news landed in, not what minute it was said.
  • Nothing before Jul 16, 2009: it is Biogen's oldest quarter with announcement and report paired in the file.
  • What will happen. The page's only future date, Oct 28, 2026, was announced by Biogen on the Nasdaq calendar and can be moved.
  • Biogen's identity is its SEC CIK (0000875045), not its symbol: symbols get recycled and renamed.

When other Healthcare companies report earnings

More on Biogen

Biogen is in the Healthcare sector. On the model's multifactor score of Oct 21, 2026 it ranks 121 of 464, and 14 of the 55 companies in its sector that score. It is a quantitative model ranking, not a recommendation.

Biogen (BIIB) analysis page →

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Guide: 10-K, 10-Q and 8-K · all guides

What is behind these dates

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Source: EDGAR, the SEC's public database (forms 8-K, 10-Q and 10-K). Data through Jul 29, 2026. This is a list of public facts and of calculations made on them, not financial advice or a recommendation to buy or sell.

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