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PRIMECAP Management Company 13F Holdings and Portfolio Changes
PRIMECAP Management Company reported $169.11B in 13F securities for Q2 2026, with 324 positions. Values are as of the report date; option positions, when present, use underlying-security values. This is not complete fund assets or investment performance.
Open interactive portfolioLatest 13F portfolio changes
New or increased positions include KLA (KLAC), BIOGEN (BIIB), SOUTHWEST AIRLS (LUV), and SCHWAB CHARLES (SCHW). Reduced or exited positions include MICRON TECHNOLOGY (MU), ELI LILLY & (LLY), INTEL (INTC), and Alphabet (GOOGL). These are comparisons between reported positions, not a record of execution dates, prices or cash traded.
Latest filing metadata: quarter Q2 2026; report date 2026-06-30; filing date 2026-08-14; disclosure source SEC 13F.
Reported holdings and concentration
PRIMECAP Management Company's Q2 2026 13F report contains 324 positions valued at $169.11B. The largest reported holdings include MICRON TECHNOLOGY, ELI LILLY &, INTEL, KLA, and Alphabet.
The three largest positions in the holdings table account for approximately 25.8% of reported 13F value. The largest reported sector exposure is Information Technology at 38.7% of the disclosed portfolio.
The filing metadata lists report date 2026-06-30, filing date 2026-08-14, SEC accession 0000763212-26-000028. SEC 13F reports are normally published up to 45 days after quarter end, so the data is best used to understand institutional positioning after the fact rather than to infer today's exact portfolio.
PRIMECAP Management Company portfolio analytics
the top five positions account for 35.9% of disclosed value; the largest sector exposure is Information Technology at 38.7%; latest prices differ from modeled cost estimates by an average 185.4% across 323 tracked positions (estimated costs, not reported purchase prices or actual investment returns).
Top reported holdings
| Holding | Reported value | Weight | Quarter change |
|---|---|---|---|
| MU whale holders MICRON TECHNOLOGY INC | $22.18B | 13.1% | Reduced |
| LLY whale holders ELI LILLY & CO | $11.00B | 6.5% | Reduced |
| INTC whale holders INTEL CORP | $10.51B | 6.2% | Reduced |
| KLAC whale holders KLA CORP | $6.20B | 3.7% | Increased |
| GOOGL whale holders ALPHABET INC | $5.31B | 3.1% | Reduced |
| FLEX whale holders FLEX LTD | $3.79B | 2.2% | Reduced |
| AZN whale holders ASTRAZENECA PLC | $3.43B | 2.0% | Reduced |
| NVDA whale holders NVIDIA CORPORATION | $3.42B | 2.0% | Reduced |
| BIIB whale holders BIOGEN INC | $3.27B | 1.9% | Increased |
| AMZN whale holders AMAZON COM INC | $2.85B | 1.7% | Reduced |
New and increased positions
Largest reported position values among additions; not amounts spent buying.
- KLAC whale holders — KLA CORP ($6.20B)
- BIIB whale holders — BIOGEN INC ($3.27B)
- LUV whale holders — SOUTHWEST AIRLS CO ($2.51B)
- SCHW whale holders — SCHWAB CHARLES CORP ($2.32B)
- UAL whale holders — UNITED AIRLS HLDGS INC ($2.24B)
- BSX whale holders — BOSTON SCIENTIFIC CORP ($2.16B)
Reduced and exited positions
Sorted by reported position value; exits use the prior report. These are not sale proceeds.
- MU whale holders — MICRON TECHNOLOGY INC ($22.18B)
- LLY whale holders — ELI LILLY & CO ($11.00B)
- INTC whale holders — INTEL CORP ($10.51B)
- GOOGL whale holders — ALPHABET INC ($5.31B)
- FLEX whale holders — FLEX LTD ($3.79B)
- AZN whale holders — ASTRAZENECA PLC ($3.43B)
Allocation
- Information Technology: 38.7%
- Health Care: 17.2%
- Industrials: 8.5%
- Consumer Discretionary: 7.7%
- Financials: 6.2%
- Communication Services: 5.8%
- Other: 4.4%
- Energy: 1.4%
Data notes
Report date: 2026-06-30
Disclosure source: SEC 13F
Read the original SEC filing (0000763212-26-000028)
SEC 13F filings are delayed public disclosures and do not include every asset class, short positions, or real-time trades.
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Questions about this 13F filing
What does PRIMECAP Management Company report for Q2 2026?
The filing reports 324 positions and $169.11B in 13F securities. The holdings table shows reported values and weights; option values follow the filing's reporting conventions.
What changed between filings?
New or increased positions include KLA (KLAC), BIOGEN (BIIB), SOUTHWEST AIRLS (LUV), and SCHWAB CHARLES (SCHW). Reduced or exited positions include MICRON TECHNOLOGY (MU), ELI LILLY & (LLY), INTEL (INTC), and Alphabet (GOOGL).
Do these amounts show how much was bought or sold?
No. The change lists are ranked by reported position value. Exited positions use their value in the prior report. These amounts are not execution prices, cash invested or sale proceeds.
Is this the current portfolio?
No. Form 13F is a quarter-end snapshot, generally filed within 45 days of quarter end. It excludes short positions and does not cover every asset. Compare the report date and filing date before using the data.