§ 13F · FUND PROFILE
PRIMECAP MANAGEMENT CO/CA/.
Concentrated growth, low turnover
AUM · $169.1B (13F)Positions · 324Turnover · 85% · Q2Filed · Aug 14, 2026
CONCENTRATION
43%
Top 10 holdings
NEW BUYS
+13
+$1.4B deployed
EXITS
0
No exits
SECTOR SHIFT
OTHER → SEMICONDUCTORS
-6pp · +12pp
§ 01 · TOP HOLDINGS
The book · Q2 2026
FILED AUG 14, 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q2 |
|---|---|---|---|---|---|---|
| 1 | MU | MICRON TECHNOLOGY INC | 19.22M | $22.2B | 13.1% | −12% |
| 2 | LLY | ELI LILLY & CO | 9.17M | $11.0B | 6.5% | −1% |
| 3 | INTC | INTEL CORP | 75.25M | $10.5B | 6.2% | −1% |
| 4 | KLAC | KLA CORP | 20.54M | $6.2B | 3.7% | +742% |
| 5 | GOOGL | ALPHABET INC | 14.86M | $5.3B | 3.1% | −1% |
| 6 | FLEX | FLEX LTD | 23.36M | $3.8B | 2.2% | −8% |
| 7 | AZN | ASTRAZENECA PLC | 18.10M | $3.4B | 2.0% | −1% |
| 8 | NVDA | NVIDIA CORPORATION | 17.08M | $3.4B | 2.0% | −1% |
| 9 | BIIB | BIOGEN INC | 15.15M | $3.3B | 1.9% | +3% |
| 10 | AMZN | AMAZON COM INC | 11.96M | $2.9B | 1.7% | −1% |
§ 02 · SECTOR ALLOCATION
Where the money is
Other38.4% (−6pp)
Semiconductors30.2% (+12pp)
Pharmaceuticals11.5% (−2pp)
Technology6.9% (−1pp)
Retail6.2% (−2pp)
Media6.1%
§ 03 · THE PRIMECAP SIGNAL
AC read
PRIMECAP MANAGEMENT CO/CA/ is a Quality / Compounder fund managing $169.1 billion in assets. The fund runs a broad portfolio of 324 positions, moderate concentration, with the top 10 accounting for 43%. Trading activity is aggressive at 85% quarterly turnover, with 13 new positions and 0 exits last quarter. Top sector allocations: Other (38%), Semiconductors (30%), Pharmaceuticals (12%).
Read the full dossier →§ 04 · FILING HISTORY
Q-by-Q deltas
4 OF 2 FILINGS MEASURED
Q2 2026
Busy quarter
+13 buys · −0 exits · 261 changed
Q1 2026
Busy quarter
+9 buys · −0 exits · 254 changed
Q4 2025
Busy quarter
+10 buys · −0 exits · 281 changed
Q3 2025
Busy quarter
+7 buys · −0 exits · 292 changed