§ 13F · FUND PROFILE
PRIMECAP MANAGEMENT CO/CA/.
Concentrated growth, low turnover
AUM · $130.6B (13F)Positions · 327Turnover · 82% · Q1Filed · May 11, 2026
CONCENTRATION
33%
Top 10 holdings
NEW BUYS
+9
+$3.7B deployed
EXITS
0
No exits
SECTOR SHIFT
TECHNOLOGY → SEMICONDUCTORS
-1pp · +2pp
3YR HIT RATE
—
Top-5 overlap
§ 01 · TOP HOLDINGS
The book · Q1 2026
FILED MAY 11, 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q1 |
|---|---|---|---|---|---|---|
| 1 | LLY | ELI LILLY & CO | 9.22M | $8.5B | 6.7% | ±0% |
| 2 | MU | MICRON TECHNOLOGY INC | 21.87M | $7.4B | 5.8% | −12% |
| 3 | GOOGL | ALPHABET INC | 14.99M | $4.3B | 3.4% | −1% |
| 4 | AZN | ASTRAZENECA PLC | 18.21M | $3.6B | 2.8% | NEW |
| 5 | KLAC | KLA CORP | 2.44M | $3.6B | 2.8% | −15% |
| 6 | INTC | INTEL CORP | 75.76M | $3.3B | 2.6% | ±0% |
| 7 | AMGN | AMGEN INC | 8.87M | $3.1B | 2.5% | ±0% |
| 8 | NVDA | NVIDIA CORPORATION | 17.19M | $3.0B | 2.4% | ±0% |
| 9 | FDX | FEDEX CORP | 8.30M | $3.0B | 2.3% | −2% |
| 10 | BIIB | BIOGEN INC | 14.76M | $2.7B | 2.1% | ±0% |
§ 02 · SECTOR ALLOCATION
Where the money is
Other44.5% (±0)
Semiconductors18.2% (+2pp)
Pharmaceuticals13.6% (±0)
Retail8.3% (±0)
Technology7.8% (−1pp)
Biotechnology7.4%
§ 03 · THE PRIMECAP SIGNAL
AC read
PRIMECAP MANAGEMENT CO/CA/ is a Quality / Compounder fund managing $130.6 billion in assets. The fund runs a broad portfolio of 327 positions, broad diversification across holdings, with the top 10 accounting for 33%. Trading activity is aggressive at 82% quarterly turnover, with 9 new positions and 0 exits last quarter. Top sector allocations: Other (45%), Semiconductors (18%), Pharmaceuticals (14%).
Read the full dossier →§ 04 · FILING HISTORY
Q-by-Q deltas
2 FILINGS
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
Q2 2025
Busy quarter
+13 buys · −0 exits · 299 changed