Company_Context
Basic Materials
Biological Products, (No Diagnostic Substances)
Source: SEC SIC
MARKET_TICKER: BIIB
BIOGEN IDEC INCInsider Trading & SEC Form 4 Analysis
Institutional analysis of internal capital flows based on SEC Form 4 filings.
Open-Market Signal
BEARISH
SOURCE: EDGAR_SYSTEMSTATUS: VERIFIED
Signal_Window
Headline metrics use exact calendar-day windows.
6 directional transactions in 365D
Code P purchases and code S sales are measured from 2025.08.29 — 2026.08.28.
Net_Flow_365D
-$974K
Open-market buys minus salesLatest_Form_4
2026.08.04
Latest available filingActive_Insiders_365D
19
Reporting entities in windowTop_Buyer_365D
Murphy Nicole
$585Top_Seller_365D
Singhal Priya
$734.7KAutomated_Intelligence_Report :: BIIB
Analysis of eligible SEC Form 4 activity for BIIB indicates a bearish 365-day signal. The selected window contains transactions from 19 distinct reporting insiders, with aggregate nominal activity of $7.85M.
Open-market purchases minus open-market sales produce a negative net flow of $0.97M. Open-market executions represent the majority of measured nominal activity in this window, making the directional flow more representative of voluntary trading activity.
Murphy Nicole recorded the largest aggregate purchase volume, while Singhal Priya recorded the largest aggregate sale volume. Form 4 activity provides useful ownership context, but it should not be treated as a standalone prediction of future price performance.
Enriched_Research_Context
More context behind the filing
These indicators use normalized SEC roles, issuer metadata, cluster detection and post-filing market prices already calculated by the data pipeline.
Cluster_Activity
0
Clustered open-market purchase records in the recent filing sample.
No coordinated buying cluster detected
Post_Filing_Performance
Live Market Chart :: BIIB
Analyze BIIB with advanced technical indicators.
View on TradingView (Get $15 Off)Recent Insider Flow :: BIIB
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Recent_Filing_History
Inspect the underlying SEC transactions
This table shows recent filing history and is not restricted by the selected 365D headline signal window.
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Automated_Queries :: Frequently Asked Questions
>What is the overall insider sentiment for BIIB?
The 365-day open-market signal is BEARISH, with net flow of $0.97M across 19 reporting insiders in the selected window.
>When was the latest SEC Form 4 filed for BIIB?
The most recent insider transaction on record was filed on 2026.08.04. InsiderAlpha monitors EDGAR filings and updates this terminal as new Form 4 documents are published.
>How many corporate insiders are active in BIIB?
The selected 365-day window contains 19 distinct reporting insiders with eligible transactions for BIIB. This count changes when a different signal window is selected.
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