PRIMECAP MANAGEMENT CO/CA/
Long book
$127.01B
Q1 2026
Positions
320
Top-10 weight
33%
concentration
Last quarter
+30.5%
SPY +14.8%
Turnover
5%
of book per quarter
Strategy in plain words
auto-generated from filingsPRIMECAP MANAGEMENT CO/CA/ is an active long-only manager, running a $127.01B US long book across 320 positions.
The portfolio is moderately concentrated (top 10 ≈ 33% of the book). The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: ELI LILLY & CO, MICRON TECHNOLOGY INC, ALPHABET INC-CL A, ASTRAZENECA PLC, KLA CORP.
Over the last 9 quarters its long book ran on average 2.3pp per quarter ahead of the S&P 500, beating the index in 6 of 9 quarters. We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+4.8%
Q2 2024
+1.3%
Q3 2024
-1.2%
Q4 2024
-2.8%
Q1 2025
+8.9%
Q2 2025
+11.3%
Q3 2025
+10.0%
Q4 2025
-2.2%
Q1 2026
+30.5%
Sector allocation
Technology 33%
Healthcare 23%
Industrials 15%
Financials 8%
Consumer discretionary 7%
Other 5%
Services media 5%
Energy 2%
Long book by quarter
What does PRIMECAP MANAGEMENT own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| LLY ELI LILLY & CO | Healthcare | 9.2M | $8.48B | 6.7% | -0.5% |
| MU MICRON TECHNOLOGY INC | Technology | 21.9M | $7.39B | 5.8% | -11.8% |
| GOOGL ALPHABET INC-CL A | Technology | 15.0M | $4.31B | 3.4% | -0.9% |
| AZN ASTRAZENECA PLC | Healthcare | 18.2M | $3.59B | 2.8% | New |
| KLAC KLA CORP | Other | 2.4M | $3.59B | 2.8% | -15.2% |
| INTC INTEL CORP | Technology | 75.8M | $3.34B | 2.6% | -0.5% |
| AMGN AMGEN INC | Healthcare | 8.9M | $3.12B | 2.5% | -0.3% |
| NVDA NVIDIA CORP | Technology | 17.2M | $3.00B | 2.4% | -0.2% |
| FDX FEDEX CORP | Industrials | 8.3M | $2.96B | 2.3% | -2.5% |
| BIIB BIOGEN INC | Healthcare | 14.8M | $2.71B | 2.1% | 0.0% |
| MSFT MICROSOFT CORP | Technology | 7.3M | $2.69B | 2.1% | -0.3% |
| AMZN AMAZON.COM INC | Consumer discretionary | 12.1M | $2.52B | 2.0% | -1.2% |
| TSLA TESLA INC | Industrials | 6.1M | $2.28B | 1.8% | -3.0% |
| SCHW SCHWAB (CHARLES) CORP | Financials | 23.4M | $2.20B | 1.7% | +0.7% |
| BSX BOSTON SCIENTIFIC CORP | Healthcare | 32.5M | $2.04B | 1.6% | +4.6% |
| ROST ROSS STORES INC | Consumer discretionary | 9.2M | $1.99B | 1.6% | -0.4% |
| TXN TEXAS INSTRUMENTS INC | Technology | 9.7M | $1.87B | 1.5% | -4.3% |
| LUV SOUTHWEST AIRLINES CO | Industrials | 47.1M | $1.77B | 1.4% | -0.7% |
| FLEX FLEX LTD | Technology | 25.4M | $1.66B | 1.3% | -4.9% |
| GOOG ALPHABET INC-CL C | Technology | 5.7M | $1.64B | 1.3% | -0.7% |
| TJX TJX COMPANIES INC | Consumer discretionary | 9.6M | $1.53B | 1.2% | -1.5% |
| COP CONOCOPHILLIPS | Energy | 11.6M | $1.53B | 1.2% | 0.0% |
| BMY BRISTOL-MYERS SQUIBB CO | Healthcare | 25.0M | $1.52B | 1.2% | +0.4% |
| UAL UNITED AIRLINES HOLDINGS INC | Industrials | 15.8M | $1.45B | 1.1% | -1.4% |
| RJF RAYMOND JAMES FINANCIAL INC | Financials | 9.3M | $1.35B | 1.1% | +0.1% |
| V VISA INC-CLASS A SHARES | Services media | 4.1M | $1.23B | 1.0% | +1.3% |
| DAL DELTA AIR LINES INC | Industrials | 17.5M | $1.17B | 0.9% | -0.3% |
| ADBE ADOBE INC | Technology | 4.7M | $1.15B | 0.9% | +28.7% |
| ELAN ELANCO ANIMAL HEALTH INC | Healthcare | 45.8M | $1.10B | 0.9% | -0.8% |
| JPM JPMORGAN CHASE & CO | Financials | 3.4M | $1.00B | 0.8% | -5.6% |
| ADI ANALOG DEVICES INC | Technology | 3.1M | $997.7M | 0.8% | -0.2% |
| TMO THERMO FISHER SCIENTIFIC INC | Other | 2.0M | $974.5M | 0.8% | -3.6% |
| NTAP NETAPP INC | Technology | 9.1M | $927.4M | 0.7% | -0.1% |
| NTRS NORTHERN TRUST CORP | Financials | 6.5M | $914.0M | 0.7% | -0.9% |
| JBL JABIL INC | Technology | 3.3M | $871.6M | 0.7% | -1.9% |
| ORCL ORACLE CORP | Technology | 5.7M | $834.7M | 0.7% | -5.9% |
| NXT NEXTPOWER INC-CL A | Technology | 6.8M | $815.0M | 0.6% | -2.7% |
| BMRN BIOMARIN PHARMACEUTICAL INC | Healthcare | 14.2M | $801.8M | 0.6% | -2.4% |
| ACM AECOM | Services media | 8.6M | $733.4M | 0.6% | -0.2% |
| RCL ROYAL CARIBBEAN CRUISES LTD | Industrials | 2.3M | $645.8M | 0.5% | -2.6% |
| IEX IDEX CORP | Industrials | 3.3M | $626.1M | 0.5% | +2.4% |
| CAT CATERPILLAR INC | Industrials | 872.3K | $618.0M | 0.5% | -0.9% |
| WFC WELLS FARGO & CO | Financials | 7.7M | $614.8M | 0.5% | -7.6% |
| DIS WALT DISNEY CO/THE | Services media | 6.2M | $600.9M | 0.5% | 0.0% |
| J JACOBS SOLUTIONS INC | Industrials | 4.5M | $574.7M | 0.5% | -0.2% |
| GLW CORNING INC | Industrials | 4.1M | $562.2M | 0.4% | -0.1% |
| MKTX MARKETAXESS HOLDINGS INC | Financials | 3.3M | $552.2M | 0.4% | +5.4% |
| CME CME GROUP INC | Financials | 1.8M | $537.2M | 0.4% | -3.2% |
| AAL AMERICAN AIRLINES GROUP INC | Industrials | 49.0M | $526.2M | 0.4% | 0.0% |
| ALB ALBEMARLE CORP | Materials | 2.7M | $478.4M | 0.4% | -5.0% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 11, 2026 | 320 | $127.01B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 11, 2026 | 319 | $132.11B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 12, 2025 | 327 | $130.57B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 11, 2025 | 333 | $126.19B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 9, 2025 | 335 | $120.96B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 10, 2025 | 329 | $129.12B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 8, 2024 | 336 | $136.01B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 9, 2024 | 332 | $138.13B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 14, 2024 | 335 | $134.08B | canonical | SEC ↗ |