BIIB
BIIB reference view — institutional positioning, fundamentals and flow.
AC intelligence is being prepared for this ticker. Review the signal stack, ownership mix and insider tape below for the data behind our read.
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
§ 04 · FUNDAMENTALS · THE BOOKS
| P/E | 20.1 | P/S | — |
| EV/EBITDA | — | P/B | 1.41 |
| Revenue (TTM) | — | Rev YoY | — |
| Gross margin | — | Op margin | — |
| Net income | — | FCF | — |
| Cash | — | Debt | — |
| Dividend | — | Buybacks 1Y | — |
Fundamentals snapshot for BIIB. Valuation multiples, margins, and balance-sheet position across two key/value columns. AC commentary expands as the narrative for this ticker is published.
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| PRIMECAP MANAGEMENT CO/CA/ | 14.8M | 2.1% | ±0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 9.5M | 0.0% | — |
| VANGUARD CAPITAL MANAGEMENT LLC | 9.5M | 0.0% | — |
| Fidelity Management | 8.3M | 0.1% | +36% |
| State Street | 7.2M | 0.0% | +0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.5M | 0.1% | — |
Top institutional owners for BIIB as of the most recent 13F window (Mar 2026). Δ Q/Q reflects share-count change vs. the prior filing — positive green means adding, negative red means trimming. Cross-reference with the ownership-mix bars below to see which strategy cohort is driving the flow.
§ 06 · WHO OWNS IT · BY STRATEGY
Ownership mix by behavioral cohort. Top bars indicate which style of capital dominates the float — passive indexing, quality compounders, dealer/bank, systematic quant, etc. Big quality-compounder share means concentrated active conviction; heavy passive share means flows are dictated by index rebalances, not fundamentals.
§ 07 · INSIDER ACTIVITY · LAST 180 DAYS
| Date | Insider | Role | Action | Shares | $ value |
|---|---|---|---|---|---|
| AUG 05 | Minor Lloyd | — | SELL | 593 | −$119K |
| FEB 17 | Murphy Nicole | — | BUY | 3 | +$585 |
| FEB 10 | Singhal Priya | — | SELL | 3K | −$532K |
| FEB 03 | Singhal Priya | — | SELL | 748 | −$134K |
| SEP 02 | Singhal Priya | — | SELL | 517 | −$69K |
1 insider buy, 4 sells in the last 180 days. Scheduled 10b5-1 sales are pre-programmed and neutral; discretionary clusters are the tape worth reading. Cross-reference with the signal stack above for context.