# Biogen Inc.: filings

BIIB · Nasdaq · CIK 875045 · [Healthcare](/sectors/healthcare.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/biib.md) · [Financials](/companies/biib/financials.md) · [Filings](/companies/biib/filings.md) · [Insiders](/companies/biib/insiders.md)

## Reports and events: 295 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 1042, 8-K 187, SC 13G/A 71, DEFA14A 58, 10-Q 54, 3 53, UPLOAD 24, 144 21, 10-K 18, DEF 14A 17, CORRESP 16, SC 13G 15, ARS 11, DFAN14A 10, SC TO-T/A 10, 4/A 9, 424B2 6, 8-K/A 6, SC 13D/A 6, SCHEDULE 13G/A 6, 5 5, PRE 14A 4, PX14A6G 4, S-8 4, SC TO-C 4, 3/A 3, CT ORDER 3, FWP 3, S-3ASR 3, SCHEDULE 13D/A 3, DEFC14A 2, EFFECT 2, NO ACT 2, PREC14A 2, PRER14A 2, SC 13D 2, SCHEDULE 13D 2, SCHEDULE 13G 2, SC TO-T 2, 424B3 1, 8-A12G/A 1, DEFR14A 1, DFRN14A 1, POS AM 1, PRRN14A 1, S-4 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-28 | 06:23 ET | [10-Q](/filings/0000875045-26-000096.md) | Quarterly report, period 2026-09-30 | 0000875045-26-000096 |
| 2026-10-28 | 06:07 ET | [8-K](/filings/0000875045-26-000094.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-26-000094 |
| 2026-07-29 | 06:36 ET | [10-Q](/filings/0000875045-26-000075.md) | Quarterly report, period 2026-06-30 | 0000875045-26-000075 |
| 2026-07-29 | 06:10 ET | [8-K](/filings/0000875045-26-000073.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-26-000073 |
| 2026-07-01 | 16:08 ET | [8-K](/filings/0000875045-26-000068.md) | 2.02 Results of operations | 0000875045-26-000068 |
| 2026-06-10 | 16:54 ET | [8-K](/filings/0000950157-26-000700.md) | 5.07 Shareholder vote results | 0000950157-26-000700 |
| 2026-06-10 | 16:49 ET | [8-K/A](/filings/0000950157-26-000699.md) | 9.01 Financial statements and exhibits | 0000950157-26-000699 |
| 2026-05-14 | 16:36 ET | [SCHEDULE 13D/A](/filings/0000950157-26-000611.md) | Ownership report, active investor, amended | 0000950157-26-000611 |
| 2026-05-14 | 08:31 ET | [8-K](/filings/0001193125-26-222908.md) | 1.01 Entry into a material agreement; 2.01 Completion of an acquisition or disposition; 2.03 New direct financial obligation; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-222908 |
| 2026-04-29 | 06:40 ET | [10-Q](/filings/0000875045-26-000045.md) | Quarterly report, period 2026-03-31 | 0000875045-26-000045 |
| 2026-04-29 | 06:05 ET | [8-K](/filings/0000875045-26-000042.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-26-000042 |
| 2026-04-28 | 16:34 ET | [DEF 14A](/filings/0001193125-26-187303.md) | Proxy statement, period 2026-06-09 | 0001193125-26-187303 |
| 2026-04-06 | 18:08 ET | [SCHEDULE 13D](/filings/0000950157-26-000478.md) | Ownership report, active investor | 0000950157-26-000478 |
| 2026-04-06 | 06:31 ET | [8-K](/filings/0000875045-26-000039.md) | 2.02 Results of operations | 0000875045-26-000039 |
| 2026-03-31 | 17:03 ET | [8-K](/filings/0001193125-26-134889.md) | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-134889 |
| 2026-03-11 | 17:28 ET | [8-K](/filings/0000950157-26-000280.md) | 5.02 Departure or appointment of officers or directors | 0000950157-26-000280 |
| 2026-02-11 | 17:07 ET | [8-K](/filings/0001193125-26-046803.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events | 0001193125-26-046803 |
| 2026-02-06 | 07:36 ET | [10-K](/filings/0000875045-26-000013.md) | Annual report, period 2025-12-31 | 0000875045-26-000013 |
| 2026-02-06 | 06:55 ET | [8-K](/filings/0000875045-26-000011.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-26-000011 |
| 2026-01-14 | 17:38 ET | [8-K](/filings/0000875045-26-000003.md) | 2.02 Results of operations | 0000875045-26-000003 |
| 2025-10-30 | 06:31 ET | [10-Q](/filings/0000875045-25-000049.md) | Quarterly report, period 2025-09-30 | 0000875045-25-000049 |
| 2025-10-30 | 06:13 ET | [8-K](/filings/0000875045-25-000047.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000047 |
| 2025-10-14 | 16:19 ET | [8-K](/filings/0000875045-25-000040.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000040 |
| 2025-07-31 | 06:13 ET | [8-K](/filings/0000875045-25-000035.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000035 |
| 2025-07-31 | 06:05 ET | [10-Q](/filings/0000875045-25-000033.md) | Quarterly report, period 2025-06-30 | 0000875045-25-000033 |
| 2025-07-30 | 17:56 ET | [SCHEDULE 13D/A](/filings/0000950157-25-000596.md) | Ownership report, active investor, amended | 0000950157-25-000596 |
| 2025-07-21 | 21:18 ET | [SCHEDULE 13D/A](/filings/0000950157-25-000586.md) | Ownership report, active investor, amended | 0000950157-25-000586 |
| 2025-07-07 | 16:10 ET | [8-K](/filings/0000875045-25-000027.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000027 |
| 2025-06-23 | 16:18 ET | [8-K](/filings/0000875045-25-000023.md) | 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0000875045-25-000023 |
| 2025-05-12 | 16:45 ET | [8-K](/filings/0001193125-25-117854.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-117854 |
| 2025-05-01 | 16:48 ET | [10-Q](/filings/0000875045-25-000018.md) | Quarterly report, period 2025-03-31 | 0000875045-25-000018 |
| 2025-05-01 | 06:52 ET | [8-K](/filings/0000875045-25-000014.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000014 |
| 2025-04-28 | 21:38 ET | [DEF 14A](/filings/0001193125-25-097747.md) | Proxy statement, period 2025-06-17 | 0001193125-25-097747 |
| 2025-02-12 | 17:28 ET | [10-K](/filings/0000875045-25-000009.md) | Annual report, period 2024-12-31 | 0000875045-25-000009 |
| 2025-02-12 | 07:06 ET | [8-K](/filings/0000875045-25-000004.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-25-000004 |
| 2025-01-15 | 08:00 ET | [8-K](/filings/0001193125-25-006578.md) | 5.02 Departure or appointment of officers or directors | 0001193125-25-006578 |
| 2025-01-10 | 17:34 ET | [SCHEDULE 13D](/filings/0000950170-25-004311.md) | Ownership report, active investor | 0000950170-25-004311 |
| 2024-10-30 | 16:45 ET | [8-K](/filings/0001193125-24-247628.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-247628 |
| 2024-10-30 | 16:31 ET | [10-Q](/filings/0000875045-24-000032.md) | Quarterly report, period 2024-09-30 | 0000875045-24-000032 |
| 2024-10-30 | 06:55 ET | [8-K](/filings/0000875045-24-000030.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-24-000030 |
| 2024-09-12 | 07:31 ET | [8-K](/filings/0001193125-24-217633.md) | 5.02 Departure or appointment of officers or directors | 0001193125-24-217633 |
| 2024-08-14 | 16:30 ET | [8-K](/filings/0001193125-24-200660.md) | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001193125-24-200660 |
| 2024-08-01 | 16:11 ET | [10-Q](/filings/0000875045-24-000025.md) | Quarterly report, period 2024-06-30 | 0000875045-24-000025 |
| 2024-08-01 | 06:55 ET | [8-K](/filings/0000875045-24-000022.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-24-000022 |
| 2024-06-25 | 17:01 ET | [8-K](/filings/0001193125-24-167938.md) | 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-24-167938 |
| 2024-04-26 | 17:01 ET | [DEF 14A](/filings/0001193125-24-118313.md) | Proxy statement, period 2024-06-20 | 0001193125-24-118313 |
| 2024-04-24 | 16:15 ET | [10-Q](/filings/0000875045-24-000016.md) | Quarterly report, period 2024-03-31 | 0000875045-24-000016 |
| 2024-04-24 | 07:02 ET | [8-K](/filings/0000875045-24-000012.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-24-000012 |
| 2024-02-14 | 17:40 ET | [10-K](/filings/0000875045-24-000009.md) | Annual report, period 2023-12-31 | 0000875045-24-000009 |
| 2024-02-13 | 07:07 ET | [8-K](/filings/0000875045-24-000004.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000875045-24-000004 |

Page 1 of 6. [Older](/companies/biib/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 28, 2026, 07:28 ET. No prices; not investment advice.