PRIMECAP MANAGEMENT CO/CA/
PERIOD 2026-Q1 · SOURCE: SEC EDGAR (PUBLIC)
Holdings as of the 2026-Q1 13F-HR filing. 13F is disclosed up to 45 days after quarter-end.
Concentration
Share of the largest positions we rank. Long US-listed equity positions as filed; percentages are of reported 13F value, which excludes shorts, cash, non-US and private holdings.
| Tier | Reported value | Share |
|---|---|---|
| Top position | $8.5B | 13.0% |
| Top 5 | $29.0B | 44.3% |
| Top 10 | $44.1B | 67.4% |
Top holdings
| # | Security | Shares | Reported value | % of value |
|---|---|---|---|---|
| 1 | LLY ELI LILLY & CO trimmed | 9,223,432 | $8.5B | 6.7% |
| 2 | MU MICRON TECHNOLOGY INC added | 21,874,204 | $7.4B | 5.8% |
| 3 | GOOGL ALPHABET INC trimmed | 20,708,369 | $6.0B | 4.7% |
| 4 | AZN ASTRAZENECA PLC new | 18,213,708 | $3.6B | 2.8% |
| 5 | KVYO KLA CORP added | 2,437,647 | $3.6B | 2.8% |
| 6 | INTC INTEL CORP added | 75,761,968 | $3.3B | 2.6% |
| 7 | AMGN AMGEN INC added | 8,874,129 | $3.1B | 2.5% |
| 8 | NVDA NVIDIA CORPORATION trimmed | 17,188,230 | $3.0B | 2.4% |
| 9 | FDX FEDEX CORP added | 8,303,010 | $3.0B | 2.3% |
| 10 | BIIB BIOGEN INC added | 14,757,607 | $2.7B | 2.1% |
| 11 | MSFT MICROSOFT CORP trimmed | 7,264,560 | $2.7B | 2.1% |
| 12 | AMZN AMAZON COM INC trimmed | 12,107,038 | $2.5B | 2.0% |
Sector mix
Reported 13F value by sector, as a share of the largest positions we rank. Sectors come from company reference data joined to each holding. 5% of this value is not classified to a sector and is excluded from the mix. Long US-listed equity positions as filed.
| Sector | Reported value | Share |
|---|---|---|
| Technology | $23.5B | 35.9% |
| Healthcare | $16.4B | 25.0% |
| Consumer Cyclical | $9.1B | 13.9% |
| Communication Services | $6.0B | 9.1% |
| Industrials | $4.7B | 7.2% |
| Financial Services | $2.2B | 3.4% |
Quarter-over-quarter changes
What changed between the 2025-Q4 and 2026-Q1 13F filings. New positions and exits reflect the tracked snapshot; adds and trims are measured on reported value (split-invariant), and moves under $0.25M are omitted as noise.
Between the 2025-Q4 and 2026-Q1 filings, this filer opened its largest new position in AZN, fully exited AZNN, added most to INTC, and trimmed LLY the most. This describes what the 13F reported — not a recommendation.
New positions 7
- AZN$3.6B
- WM$64M
- LHX$49M
- PVLA$24M
- FITBM$9M
- XEL$5M
Exited 6
- AZNN$3.4B
- CYBR$14M
- CMA$11M
- SOLS$6M
- EXAS$3M
- SNCY$2M
Largest adds
- INTC$534M
- FDX$498M
- COP$445M
- ROST$328M
- MU$313M
- NXT$209M
Largest trims
- LLY$1.5B
- BSX$924M
- MSFT$835M
- GOOGL$593M
- TSLA$564M
- BABA$433M
Portfolio trend
Reported 13F value and position count by filing quarter (independent scales).
Frequently asked
What does PRIMECAP MANAGEMENT CO/CA/ own?
PRIMECAP MANAGEMENT CO/CA/ reported 319 long US-listed equity positions worth $127.0B in its 2026-Q1 13F filing. The largest positions and their reported values are listed above.
What changed in PRIMECAP MANAGEMENT CO/CA/'s portfolio last quarter?
The quarter-over-quarter section lists new positions, exits, and the largest adds and trims versus the prior filing, measured on reported value.
Where does this data come from?
Holdings are parsed from SEC Form 13F-HR filings on EDGAR (public filings). 13F is disclosed up to 45 days after quarter-end and reflects long US-listed equity positions only. Informational, not investment advice.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It is filed up to 45 days after quarter-end, so it is backward-looking — the manager may have traded since — and it covers long US-listed equities only, not short positions, cash, or private holdings. Reading a 13F tells you what a manager owned, not whether you should own it.