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§ 13F · FUND PROFILE

PRIMECAP MANAGEMENT CO/CA/.

Concentrated growth, low turnover
AUM · $130.6B (13F)Positions · 327Turnover · 82% · Q1Filed · May 11, 2026
BIG MOVE · Q1
Technology cut 1pp. Semiconductors lifted 2pp.
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
#TickerNameShares$ value% portΔ Q1
1LLYELI LILLY & CO9.22M$8.5B6.7%±0%
2MUMICRON TECHNOLOGY INC21.87M$7.4B5.8%−12%
3GOOGLALPHABET INC14.99M$4.3B3.4%−1%
4AZNASTRAZENECA PLC18.21M$3.6B2.8%NEW
5KLACKLA CORP2.44M$3.6B2.8%−15%
6INTCINTEL CORP75.76M$3.3B2.6%±0%
7AMGNAMGEN INC8.87M$3.1B2.5%±0%
8NVDANVIDIA CORPORATION17.19M$3.0B2.4%±0%
9FDXFEDEX CORP8.30M$3.0B2.3%−2%
10BIIBBIOGEN INC14.76M$2.7B2.1%±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%).

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§ 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