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PRIMECAP Management Co — 13F Holdings & Portfolio

CIK 763212 · latest 13F-HR filed 2026-08-14

Backtest portfolio

PRIMECAP Management Co manages $169.11B in 13F-reported U.S. long-equity assets across 324 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MU (13.12%), LLY (6.51%), INTC (6.21%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 13 new positions and exited 9; 181 existing positions rose in reported value and 89 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$169.11B

Long-equity book

Holdings
324

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+13 / −9 / ↑181 / ↓89

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
MU13.1% · -12%LLY6.5% · -0%INTC6.2% · -1%KLAC3.7% · +742%GOOGL3.1% · -1%FLEX2.2% · -8%AZN2.0% · -1%NVDA2.0% · -1%BIIB1.9% · +3%AMZN1.7% · -1%MSFT1.6% · -2%TSLA1.5% · -0%FDX1.5% · -2%TXN1.5% · -12%LUV1.5% · +4%AMGN1.4% · -24%SCHW1.4% · +7%UAL1.3% · +4%BSX1.3% · +55%ROST1.1% · -1%GOOG1.1% · -6%BABA1.1% · -1%DAL1.0% · -0%V0.9% · +5%BMY0.8% · -0%TJX0.8% · -1%ONC0.8% · +1%RJF0.8% · -1%NTAP0.8% · -0%GSK0.8% · -0%AAL0.8% · +44%BIDU0.7% · -0%ADI0.7% · -0%JBL0.7% · -4%COP0.7% · +0%SONY0.7% · +2%ELAN0.7% · -1%JPM0.7% · -1%ADBE0.6% · +10%NTRS0.6% · -7%GLW0.6% · -0%NVS0.6% · -13%TMO0.6% · -0%CAT0.5% · -0%MRVL0.5% · -7%BMRN0.5% · -0%NXT0.5% · -1%ORCL0.5% · -5%HPE0.5% · -0%AMAT0.4% · -11%IEX0.4% · -0%ASML0.4% · -0%DIS0.4% · +13%RCL0.4% · -10%XMTR0.4% · +2%ILMN0.4% · +70%ACM0.4% · +2%FDXF0.4% · newAMD0.4% · -0%J0.3% · +1%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 42.6%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Jul 29, 2026.

Assets Under Management
$139.34B
Discretionary
$139.34B
Employees
43
Accounts
18
Address
177 E COLORADO BLVD.
11TH FLOOR
PASADENA, CA 91105
Phone
(626) 304-9222
Website
Name Title / Status Ownership Type
ANSARI, MOHAMMED, MOHSIN ControlVICE CHAIRMAN
since Jun 2024
10–25%Individual
FRIED, JOEL, PAUL ControlCHAIRMAN
since Jun 2024
25–50%Individual
KOLOKOTRONES, THEOFANIS, A ControlCHAIRMAN EMERITUS
since Jun 2024
10–25%Individual
MARCHETTI, JAMES, K ControlEXECUTIVE VICE PRESIDENT
since Sep 2005
10–25%Individual
MOLINELLI, GREGORY, TODD ControlEXECUTIVE VICE PRESIDENT
since Jan 2023
5–10%Individual
MORDECAI, ALFRED, WINBORNE ControlPRESIDENT
since Jun 2024
10–25%Individual
BUCHER, JOHN, RAYMONDCHIEF OPERATING OFFICER
since Sep 2018
Less than 5%Individual
OTTOSEN, JENNIFER, ANNCHIEF COMPLIANCE OFFICER
since Mar 2020
Less than 5%Individual
WARNICK, WILLIAM, TODDCHIEF FINANCIAL OFFICER
since Nov 2018
Less than 5%Individual
Ownership & leadership changes · 14 filings with changes since Mar 29, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Apr 8, 2025 filing
  • AddedWARNICK, WILLIAM, TODD · CHIEF FINANCIAL OFFICER · Less than 5%
Mar 27, 2025 filing
  • ChangedMARCHETTI, JAMES, K · ownership 5–10% → 10–25%
Jul 8, 2024 filing
  • ChangedANSARI, MOHAMMED, MOHSIN · title EXECUTIVE VICE PRESIDENT → VICE CHAIRMAN
  • ChangedFRIED, JOEL, PAUL · title PRESIDENT → CHAIRMAN
  • ChangedKOLOKOTRONES, THEOFANIS, A · title CHAIRMAN → CHAIRMAN EMERITUS
  • ChangedMORDECAI, ALFRED, WINBORNE · title VICE CHAIRMAN → PRESIDENT
Mar 27, 2024 filing
  • ChangedANSARI, MOHAMMED, MOHSIN · ownership 5–10% → 10–25%
  • ChangedKOLOKOTRONES, THEOFANIS, A · ownership 25–50% → 10–25%
  • ChangedMOLINELLI, GREGORY, TODD · ownership Less than 5% → 5–10%
Mar 29, 2023 filing
  • AddedMOLINELLI, GREGORY, TODD · EXECUTIVE VICE PRESIDENT · Less than 5% · control person
Mar 30, 2022 filing
  • ChangedFRIED, JOEL, PAUL · ownership 10–25% → 25–50%
  • ChangedMARCHETTI, JAMES, K · ownership Less than 5% → 5–10%
Mar 29, 2021 filing
  • ChangedBUCHER, JOHN, RAYMOND · no longer a control person
Mar 27, 2020 filing
  • No longer listedRICKS, MICHAEL, JOHN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Mar 2019
  • AddedOTTOSEN, JENNIFER, ANN · CHIEF COMPLIANCE OFFICER · Less than 5%
  • ChangedANSARI, MOHAMMED, MOHSIN · ownership Less than 5% → 5–10%
  • ChangedKOLOKOTRONES, THEOFANIS, A · ownership 10–25% → 25–50%
  • ChangedMORDECAI, ALFRED, WINBORNE · ownership Less than 5% → 10–25%
Mar 22, 2019 filing
  • No longer listedHOUGHTON, KAREN, CHEN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Oct 2004
  • AddedBUCHER, JOHN, RAYMOND · CHIEF OPERATING OFFICER · Less than 5% · control person
  • AddedRICKS, MICHAEL, JOHN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
Jun 26, 2018 filing
  • AddedMARCHETTI, JAMES, K · EXECUTIVE VICE PRESIDENT · Less than 5% · control person
Older changes (5 more filings)
Mar 21, 2018 filing
  • No longer listedMILIAS, MITCHELL, JOHN · CHAIRMAN EMERITUS · 10–25% · control person · listed since Sep 1983
Mar 10, 2016 filing
  • ChangedMORDECAI, ALFRED, WINBORNE · title EXECUTIVE VICE PRESIDENT → VICE CHAIRMAN
Oct 2, 2014 filing
  • AddedANSARI, MOHAMMED, MOHSIN · EXECUTIVE VICE PRESIDENT · Less than 5% · control person
  • ChangedKOLOKOTRONES, THEOFANIS, A · title VICE CHAIRMAN → CHAIRMAN
  • ChangedMILIAS, MITCHELL, JOHN · title CHAIRMAN → CHAIRMAN EMERITUS
Apr 17, 2012 filing
  • No longer listedSCHOW, HOWARD, BERNARD · CHAIRMAN EMERITUS · 10–25% · control person · listed since Sep 1983
Mar 29, 2012 filing (earliest on record)
  • ListedFRIED, JOEL, PAUL · PRESIDENT · 10–25% · control person
  • ListedHOUGHTON, KAREN, CHEN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedKOLOKOTRONES, THEOFANIS, A · VICE CHAIRMAN · 10–25% · control person
  • ListedMILIAS, MITCHELL, JOHN · CHAIRMAN · 10–25% · control person
  • ListedMORDECAI, ALFRED, WINBORNE · EXECUTIVE VICE PRESIDENT · Less than 5% · control person
  • ListedSCHOW, HOWARD, BERNARD · CHAIRMAN EMERITUS · 10–25% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

Show all 181 →

Top Trims

Show all 89 →

New Positions

Show all 13 →

Exited Positions

Show all 9 →

PRIMECAP Management Co Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 MICRON TECHNOLOGY INC MU 595112103 $22.18B 13.12% 19,217,236 SH
2 ELI LILLY & CO LLY 532457108 $11.00B 6.51% 9,172,904 SH
3 INTEL CORP INTC 458140100 $10.51B 6.21% 75,250,958 SH
4 KLA CORP KLAC 482480100 $6.20B 3.66% 20,536,730 SH
5 ALPHABET INC GOOGL 02079K305 $5.31B 3.14% 14,859,769 SH
6 FLEX LTD FLEX Y2573F102 $3.79B 2.24% 23,358,875 SH
7 ASTRAZENECA PLC AZN G0593M107 $3.43B 2.03% 18,095,178 SH
8 NVIDIA CORPORATION NVDA 67066G104 $3.42B 2.02% 17,079,180 SH
9 BIOGEN INC BIIB 09062X103 $3.27B 1.94% 15,154,606 SH
10 AMAZON COM INC AMZN 023135106 $2.85B 1.69% 11,962,188 SH
11 MICROSOFT CORP MSFT 594918104 $2.66B 1.58% 7,140,870 SH
12 TESLA INC TSLA 88160R101 $2.57B 1.52% 6,103,030 SH
13 FEDEX CORP FDX 31428X106 $2.55B 1.51% 8,156,799 SH
14 TEXAS INSTRS INC TXN 882508104 $2.54B 1.50% 8,514,989 SH
15 SOUTHWEST AIRLS CO LUV 844741108 $2.51B 1.48% 48,797,725 SH
16 AMGEN INC AMGN 031162100 $2.45B 1.45% 6,756,962 SH
17 SCHWAB CHARLES CORP SCHW 808513105 $2.32B 1.37% 25,120,895 SH
18 UNITED AIRLS HLDGS INC UAL 910047109 $2.24B 1.32% 16,461,630 SH
19 BOSTON SCIENTIFIC CORP BSX 101137107 $2.16B 1.28% 50,520,914 SH
20 ROSS STORES INC ROST 778296103 $1.94B 1.15% 9,104,980 SH
21 ALPHABET INC GOOG 02079K107 $1.91B 1.13% 5,399,060 SH
22 ALIBABA GROUP HLDG LTD BABA 01609W102 $1.79B 1.06% 18,611,306 SH
23 DELTA AIR LINES INC DAL 247361702 $1.64B 0.97% 17,521,167 SH
24 VISA INC V 92826C839 $1.46B 0.87% 4,268,491 SH
25 BRISTOL-MYERS SQUIBB CO BMY 110122108 $1.44B 0.85% 24,923,900 SH
26 TJX COS INC NEW TJX 872540109 $1.44B 0.85% 9,476,020 SH
27 BEONE MEDICINES LTD ONC 07725L102 $1.43B 0.84% 5,007,931 SH
28 RAYMOND JAMES FINL INC RJF 754730109 $1.41B 0.83% 9,242,552 SH
29 NETAPP INC NTAP 64110D104 $1.40B 0.83% 9,016,690 SH
30 GSK PLC GSK 37733W204 $1.32B 0.78% 25,182,068 SH
31 AMERICAN AIRLINES GROUP INC AAL 02376R102 $1.28B 0.76% 70,732,954 SH
32 BAIDU INC BIDU 056752108 $1.26B 0.74% 11,010,100 SH
33 ANALOG DEVICES INC ADI 032654105 $1.24B 0.73% 3,128,329 SH
34 JABIL INC JBL 466313103 $1.22B 0.72% 3,167,120 SH
35 CONOCOPHILLIPS COP 20825C104 $1.20B 0.71% 11,588,365 SH
36 SONY GROUP CORP SONY 835699307 $1.20B 0.71% 59,603,230 SH
37 ELANCO ANIMAL HEALTH INC ELAN 28414H103 $1.12B 0.66% 45,445,012 SH
38 JPMORGAN CHASE & CO JPM 46625H100 $1.11B 0.65% 3,382,627 SH
39 ADOBE INC ADBE 00724F101 $1.07B 0.63% 5,227,139 SH
40 NORTHERN TR CORP NTRS 665859104 $1.06B 0.63% 6,100,742 SH
41 CORNING INC GLW 219350105 $1.06B 0.62% 4,131,872 SH
42 NOVARTIS AG NVS 66987V109 $1.03B 0.61% 6,592,124 SH
43 THERMO FISHER SCIENTIFIC INC TMO 883556102 $993.8M 0.59% 1,982,271 SH
44 CATERPILLAR INC CAT 149123101 $928.3M 0.55% 871,700 SH
45 MARVELL TECHNOLOGY INC MRVL 573874104 $821.6M 0.49% 2,757,995 SH
46 BIOMARIN PHARMACEUTICAL INC BMRN 09061G101 $812.0M 0.48% 14,190,183 SH
47 NEXTPOWER INC NXT 65290E101 $796.9M 0.47% 6,688,767 SH
48 ORACLE CORP ORCL 68389X105 $789.4M 0.47% 5,386,230 SH
49 HEWLETT PACKARD ENTERPRISE C HPE 42824C109 $773.2M 0.46% 17,140,875 SH
50 APPLIED MATLS INC AMAT 038222105 $754.0M 0.45% 1,042,926 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $169.11B 324 0000763212-26-000028
2026-03-31 2026-05-11 $127.01B 320 0000763212-26-000016
2025-12-31 2026-02-11 $132.11B 319 0000763212-26-000012
2025-09-30 2025-11-12 $130.57B 327 0000763212-25-000005
Filer Information
Address
177 EAST COLORADO BLVD.
11TH FLOOR
PASADENA, CA 91105
Phone
(626) 304-9222
Filing Manager
PRIMECAP MANAGEMENT CO/CA/
PASADENA, CA
Signatory
Jennifer Ottosen
Chief Compliance Officer