Biogen (BIIB)Susquehanna Portfolio Strategies, LLC reduced its stake -13K shares

99K

Shares reported · -13K vs prior quarter

0.34%

Disclosed portfolio weight

$21.3M

Reported value

Holdings as of

Jun 30, 2026

Filed

Aug 14, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Mar 27, 2026CongressDisclosed purchase of BIIB — reported range $1,001 - $15,000
2. Jun 2, 2026CongressDisclosed sale of BIIB — reported range $15,001 - $50,000
3. Jun 5, 2026CongressDisclosed purchase of BIIB — reported range $1,001 - $15,000
4. Jul 1, 2026Company filing · Form 8-K · ResultsReported its results
5. Jul 23, 2026Government · Federal Register noticeAdvisory Committee; Peripheral and Central Nervous System Drugs Advisory Committee; Termination and Reestablishment
6. Jul 29, 2026Company filing · Form 8-K · ResultsReported its results
7. Aug 3, 2026InsiderDirector sold ~$121K of BIIB shares in the open market
8. Aug 4, 2026InsiderDirector sold ~$119K of BIIB shares in the open market
9. Aug 6, 20265% stakeFMR LLC reported a passive stake (13G) of 12.4%

What came next

1. Aug 18, 2026CongressDisclosed sale of BIIB — reported range $1,001 - $15,000
2. Sep 17, 2026Government · Federal Register noticeGranting of Requests for Early Termination of the Waiting Period Under the Premerger Notification Rules
3. Sep 24, 2026CongressDisclosed partial sale of BIIB — reported range $1,001 - $15,000

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

What else is on file for Biogen

For Biogen, OQRO holds 2 insider filings (SEC Form 4 or Form 144), 3 Congress trade reports and 11 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its BIIB page.

How this filing works

• SEC Form 13F

Other disclosures at Biogen

• House Clerk periodic transaction reportOct 7, 2026
• House Clerk periodic transaction reportSep 1, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026

Everything OQRO holds on this company is on its BIIB page.