PRIMECAP Management Holdings 13F: Latest PRIMECAP Management Company Portfolio Changes
PRIMECAP Management Company. Pasadena-based growth fund manager. Runs Odyssey Funds.
As of the latest Q1 2026 13F filing, PRIMECAP Management (managing PRIMECAP Management Company) reported a public portfolio value of $127.0B with 320 positions. This page tracks latest holdings, latest 13F changes, top buys, top sells, and top holdings from the public filing. The top recent buy was AZN. The top recent sell was LLY.
Open interactive portfolioLatest 13F portfolio changes
PRIMECAP Management holdings 13F summary: the latest PRIMECAP Management Company portfolio changes show top holdings including ELI LILLY &, MICRON TECHNOLOGY, Alphabet, ASTRAZENECA, and KLA, reported top buys such as ASTRAZENECA, SCHWAB CHARLES, BOSTON SCIENTIFIC, and CONOCOPHILLIPS, and top sells or reductions such as ELI LILLY &, MICRON TECHNOLOGY, Alphabet, and KLA.
Latest filing metadata: quarter Q1 2026; report date 2026-03-31; filing date 2026-05-11; disclosure source SEC 13F.
PRIMECAP Management 13F portfolio and latest holdings overview
PRIMECAP Management's Q1 2026 13F holdings show PRIMECAP Management Company reporting 320 positions with a disclosed portfolio value of $127.0B. For readers searching PRIMECAP Management 13F holdings, PRIMECAP Management portfolio, PRIMECAP Management Company holdings, or latest 13F changes, the latest top holdings include ELI LILLY &, MICRON TECHNOLOGY, Alphabet, ASTRAZENECA, and KLA.
The three largest reported positions add up to roughly 15.9%, which helps readers judge portfolio concentration rather than just headline AUM. The largest reported sector exposure is Information Technology at 26.2% of the disclosed portfolio. This makes the page useful for comparing the manager's actual disclosed exposure with market narratives around the same names.
The latest change data highlights reported buys such as ASTRAZENECA, SCHWAB CHARLES, BOSTON SCIENTIFIC, CONOCOPHILLIPS, and BRISTOL-MYERS SQUIBB and reported reductions or exits such as ELI LILLY &, MICRON TECHNOLOGY, Alphabet, KLA, and ASTRAZENECA. Those changes should be read as historical disclosure signals, not as real-time trade alerts.
The filing metadata lists report date 2026-03-31, filing date 2026-05-11, SEC accession 0000763212-26-000016. 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 portfolio analytics
the top five positions account for 23.9% of disclosed value; the largest sector exposure is Information Technology at 26.2%; reported buy and sell activity implies roughly 86.1% turnover this period; cost-basis P&L across 317 tracked positions averages 178.2% (99/143 currently in profit).
Top reported holdings
| Holding | Reported value | Weight | Quarter change |
|---|---|---|---|
| LLY whale holders ELI LILLY & CO | $8.48B | 6.7% | Reduced |
| MU whale holders MICRON TECHNOLOGY INC | $7.39B | 5.8% | Reduced |
| GOOGL whale holders ALPHABET INC | $4.31B | 3.4% | Reduced |
| AZN whale holders ASTRAZENECA PLC | $3.59B | 2.8% | New |
| KLAC whale holders KLA CORP | $3.59B | 2.8% | Reduced |
| INTC whale holders INTEL CORP | $3.34B | 2.6% | Reduced |
| AMGN whale holders AMGEN INC | $3.12B | 2.5% | Reduced |
| NVDA whale holders NVIDIA CORPORATION | $3.00B | 2.4% | Reduced |
| FDX whale holders FEDEX CORP | $2.96B | 2.3% | Reduced |
| BIIB whale holders BIOGEN INC | $2.71B | 2.1% | Reduced |
Top buys
- AZN whale holders — ASTRAZENECA PLC ($3.59B)
- SCHW whale holders — SCHWAB CHARLES CORP ($2.20B)
- BSX whale holders — BOSTON SCIENTIFIC CORP ($2.04B)
- COP whale holders — CONOCOPHILLIPS ($1.53B)
- BMY whale holders — BRISTOL-MYERS SQUIBB CO ($1.52B)
- GLAXF whale holders — GSK PLC ($1.39B)
Top sells
- LLY whale holders — ELI LILLY & CO ($8.48B)
- MU whale holders — MICRON TECHNOLOGY INC ($7.39B)
- GOOGL whale holders — ALPHABET INC ($4.31B)
- KLAC whale holders — KLA CORP ($3.59B)
- AZN whale holders — ASTRAZENECA PLC ($3.39B)
- INTC whale holders — INTEL CORP ($3.34B)
Allocation
- Information Technology: 26.2%
- Health Care: 21.4%
- Industrials: 11.6%
- Consumer Discretionary: 10.4%
- Financials: 7.7%
- Communication Services: 6.8%
- Energy: 2.4%
- Other: 2.2%
Data notes
Report date: 2026-03-31
Disclosure source: SEC 13F
SEC 13F filings are delayed public disclosures and do not include every asset class, short positions, or real-time trades.
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Frequently asked questions
PRIMECAP Management 13F Holdings
The Q1 2026 13F profile for PRIMECAP Management and PRIMECAP Management Company shows 320 reported positions, $127.0B in disclosed portfolio value, and top holdings including ELI LILLY &, MICRON TECHNOLOGY, Alphabet, ASTRAZENECA, and KLA.
What is PRIMECAP Management buying? Latest 13F changes
The latest tracked change data for PRIMECAP Management highlights reported buys such as ASTRAZENECA, SCHWAB CHARLES, BOSTON SCIENTIFIC, and CONOCOPHILLIPS and reported sells or reductions such as ELI LILLY &, MICRON TECHNOLOGY, Alphabet, and KLA.
PRIMECAP Management Company top holdings
PRIMECAP Management Company top holdings are summarized from public disclosures with reported values, weights, portfolio concentration, top buys, top sells, and filing metadata where available.
PRIMECAP Management buys and sells
Use the top buys and top sells sections above to compare PRIMECAP Management's reported additions, reductions, exits, and latest portfolio activity against other tracked investors.
How delayed is PRIMECAP Management's 13F data?
SEC Form 13F requires institutional investment managers with $100M+ in US equities to disclose their holdings quarterly. Read our comprehensive 13F guide for timing, coverage, and limitations. Read the Whale Analyzer 13F guide.