BIIB
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
§ 04 · FUNDAMENTALS · THE BOOKS
| P/E | 39.9 | P/B | 1.41 |
| EPS (TTM) | 5.65 |
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| BlackRock | 16.0M | 0.1% | +8% |
| PRIMECAP MANAGEMENT CO/CA/ | 14.8M | 2.1% | ±0% |
| Fidelity Management | 12.8M | 0.1% | +36% |
| VANGUARD CAPITAL MANAGEMENT LLC | 9.5M | n/a | n/a |
| State Street | 7.2M | 0.0% | +0% |
| Vanguard Portfolio Management | 6.5M | n/a | n/a |
Top institutional owners for BIIB as of the most recent 13F reporting period (Q1 2026 · Period ended Mar 31). 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 | Action | Shares | $ value |
|---|---|---|---|---|
| AUG 05 | Minor Lloyd | SELL | 593 | −$119K |
0 insider buys, 1 sell 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.
§ 08 · COVERAGE · OUR RECENT NOTES
No notes mention BIIB yet.