Ownership history in PRIMECAP MANAGEMENT CO/CA/ · 89 quarters on record
This page tracks every 13F SEC filing in which PRIMECAP MANAGEMENT CO/CA/ reported a position in BIOGEN IDEC COM (BIIB). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.
| Quarter | Action | Shares | Change | Chg % | % of Fund | Mkt Value | Price (EOQ) |
|---|---|---|---|---|---|---|---|
| 2025 Q4 | REDUCED | 14,757,997 | -196,700 | -1.3% | 1.97% | $2.60B | $175.99 |
| 2025 Q3 | REDUCED | 14,954,697 | -847,425 | -5.4% | 1.60% | $2.09B | $140.08 |
| 2025 Q2 | REDUCED | 15,802,122 | -141,137 | -0.9% | 1.57% | $1.98B | $125.59 |
| 2025 Q1 | REDUCED | 15,943,259 | -102,950 | -0.6% | 1.80% | $2.18B | $136.84 |
| 2024 Q4 | REDUCED | 16,046,209 | -268,870 | -1.6% | 1.90% | $2.45B | $152.92 |
| 2024 Q3 | REDUCED | 16,315,079 | -23,215 | -0.1% | 2.33% | $3.16B | $193.84 |
| 2024 Q2 | ADDED | 16,338,294 | +117,578 | +0.7% | 2.74% | $3.79B | $231.82 |
| 2024 Q1 | REDUCED | 16,220,716 | -43,765 | -0.3% | 2.61% | $3.50B | $215.63 |
| 2023 Q4 | ADDED | 16,264,481 | +251,915 | +1.6% | 3.33% | $4.21B | $258.77 |
| 2023 Q3 | REDUCED | 16,012,566 | -13,310 | -0.1% | 3.47% | $4.12B | $257.01 |
As of 2025 Q4 — sorted by position size