BIIB insider buying and SEC filings, explained
Biogen Inc. · CIK 875045
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$905K
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 3–4, 2026 | Planned (10b5-1) | Lloyd Minor (Director) sold 1,186 shares between Aug 3 and Aug 4 at about $202.15 ($240K), marked as a 10b5-1 plan trade. Holdings down 31% to 2,689 shares. | SEC filing Filed Aug 5, 2026 |
| Feb 12, 2026 | Purchase (code P) | Nicole Murphy (Head of Pharm Ops and Tech) bought 3 shares at $195.04 ($585), reported as a purchase (code P). Holdings up <1% to 19,611 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 17, 2026 |
| Feb 9, 2026 | Planned (10b5-1) | Priya Singhal (Head of Development) sold 2,660 shares at $199.83 ($532K), marked as a 10b5-1 plan trade. Holdings down 25% to 8,043 shares. | SEC filing Filed Feb 10, 2026 |
| Feb 2, 2026 | Planned (10b5-1) | Priya Singhal (Head of Development) sold 748 shares at $179.30 ($134K), marked as a 10b5-1 plan trade. Holdings down 11% to 6,271 shares. | SEC filing Filed Feb 3, 2026 |
37 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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