Private company

PRIMECAP MANAGEMENT CO/CA/

Last updated Oct 21, 2026.

Overview

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Corporate structure

PRIMECAP MANAGEMENT CO/CA/ sits at the top of its group. 55 entities, 7 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

PRIMECAP MANAGEMENT CO/CA/
- AECOM Stake · Dallas, Texas, United States
- Amentum Holdings, Inc. Stake · Chantilly, Virginia
- American Airlines Group Stake · Fort Worth, Texas, United States
- Arlo Technologies, Inc. Stake · Wilmington, Delaware, United States
- Axcelis Technologies Stake · Beverly, Massachusetts, United States
- Biogen Stake · Weston, Massachusetts, United States
- BioMarin Pharmaceutical Stake · Novato, California, United States
- BlackBerry Stake · Waterloo, Ontario, Canada
- Booz Allen Hamilton Stake · McLean, Virginia, United States
- Calithera Biosciences, Inc. Stake · South San Francisco, California, United States
- CarMax Stake · Richmond, Virginia, United States
- CERUS CORP Stake · Concord, California
- Comscore Stake · Reston
- CONCENTRIX SREV, INC. Stake · Denver, Colorado
- Crane NXT, Co. Stake · Stamford, Connecticut, United States
- Descartes Systems Group Stake · Lier
- Elanco Stake · Greenfield
- Epizyme, Inc. Stake · Wilmington, Delaware, United States
- FedEx Stake · Memphis, Tennessee, United States
- Flex Ltd. Stake · Singapore, Singapore
- GLAUKOS Corp Stake · San Clemente, California, United States
- GRAIL Stake · Menlo Park, California, United States
- Immunocore Stake · Abingdon, United Kingdom
- indie Semiconductor, Inc. Stake · Aliso Viejo, California, United States
- iRobot Stake · Bedford, Massachusetts, United States
- and 29 more

Built from major holders from Schedules 13D and 13G; stakes of 5% or more it reported on Schedules 13D and 13G (54 companies). Each entity in the chart links to its source.

Filings

24 filings to the SEC since October 2021: 24 other. The latest 20:

The 24 filings since October 2021 can be filtered by form type and year here when JavaScript is on.

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Stakes it holds

PRIMECAP MANAGEMENT CO/CA/ has told the SEC it owns more than 5% of 54 companies, latest first (Schedules 13D and 13G).

Southwest AirlinesSCHEDULE 13G/A Feb 10, 2022 to Oct 5, 2026²
Amentum Holdings, Inc.SCHEDULE 13G Aug 6, 2026³
Booz Allen HamiltonSCHEDULE 13G Aug 6, 2026⁴
Flex Ltd.SCHEDULE 13G/A Feb 10, 2022 to Aug 6, 2026⁵
GRAILSCHEDULE 13G/A Nov 12, 2024 to Aug 6, 2026⁶
MarketAxessSCHEDULE 13G/A Nov 13, 2025 to Aug 6, 2026⁷
American Airlines GroupSCHEDULE 13G/A Feb 10, 2022 to Jun 5, 2026⁸
ElancoSCHEDULE 13G/A Feb 10, 2022 to May 13, 2026⁹
Whirlpool CorporationSCHEDULE 13G/A Feb 10, 2022 to May 13, 2026¹⁰
XometrySCHEDULE 13G/A May 9, 2023 to May 13, 2026¹¹
LivaNovaSCHEDULE 13G/A Feb 10, 2022 to Feb 12, 2026¹²
Rhythm (United states)SCHEDULE 13G/A Feb 10, 2022 to Feb 12, 2026¹³
GLAUKOS CorpSCHEDULE 13G Feb 11, 2026¹⁴
Nextpower Inc.SCHEDULE 13G/A Feb 11, 2026¹⁵
United AirlinesSCHEDULE 13G/A Feb 10, 2022 to Feb 11, 2026¹⁶
NetAppSCHEDULE 13G/A Feb 10, 2022 to Nov 14, 2025¹⁷
BiogenSCHEDULE 13G/A Feb 10, 2022 to Nov 13, 2025¹⁸
Pulmonx CorpSCHEDULE 13G/A Dec 9, 2021 to Nov 13, 2025¹⁹
AECOMSCHEDULE 13G/A Feb 10, 2022 to Aug 14, 2025²⁰
BioMarin PharmaceuticalSCHEDULE 13G/A Feb 10, 2022 to Aug 14, 2025²¹
ImmunocoreSCHEDULE 13G/A Feb 13, 2025 to Aug 14, 2025²²
MattelSCHEDULE 13G/A Feb 10, 2022 to Aug 14, 2025²³
TransoceanSCHEDULE 13G/A Feb 10, 2022 to Aug 14, 2025²⁴
Xencor IncSCHEDULE 13G/A Feb 10, 2022 to Aug 14, 2025²⁵
FedExSCHEDULE 13G/A Feb 10, 2022 to May 13, 2025²⁶
New Fortress EnergySCHEDULE 13G/A Nov 12, 2024 to May 13, 2025²⁷
Raymond James FinancialSCHEDULE 13G/A Feb 9, 2023 to May 13, 2025²⁸
WolfspeedSCHEDULE 13G/A Nov 12, 2024 to May 13, 2025²⁹
KYNTRA BIO, INC.SCHEDULE 13G/A Feb 10, 2022 to Feb 13, 2025³⁰
BlackBerrySC 13G/A Feb 10, 2022 to Nov 12, 2024³¹

All 54 companies

Crane NXT, Co.SC 13G Nov 12, 2024³²
Splunk Inc.SC 13G/A Feb 9, 2023 to Nov 12, 2024³³
indie Semiconductor, Inc.SC 13G/A Aug 8, 2024 to Nov 12, 2024³⁴
Arlo Technologies, Inc.SC 13G/A Feb 10, 2022 to Sep 9, 2024³⁵
iRobotSC 13G/A Feb 10, 2022 to Sep 9, 2024³⁶
Nektar TherapeuticsSC 13G/A Feb 10, 2022 to Jul 7, 2023³⁷
Standard BioTools Inc.SC 13G/A Feb 10, 2022 to Jul 7, 2023³⁸
Calithera Biosciences, Inc.SC 13G/A Feb 10, 2022 to Feb 9, 2023³⁹
CERUS CORPSC 13G/A Feb 10, 2022 to Jan 9, 2023⁴⁰
ComscoreSC 13G/A Feb 10, 2022 to Jan 9, 2023⁴¹
StratasysSC 13G/A Feb 10, 2022 to Dec 8, 2022⁴²
Wave Life SciencesSC 13G/A Feb 10, 2022 to Dec 8, 2022⁴³
NN INCSC 13G/A Feb 10, 2022 to Nov 9, 2022⁴⁴
Axcelis TechnologiesSC 13G/A Feb 10, 2022 to Oct 7, 2022⁴⁵
Epizyme, Inc.SC 13G/A Feb 8, 2022 to Sep 8, 2022⁴⁶
PLANTRONICS INC /CA/SC 13G/A Feb 10, 2022 to Sep 8, 2022⁴⁷
Jacobs Engineering GroupSC 13G/A Feb 10, 2022 to Jun 9, 2022⁴⁸
CONCENTRIX SREV, INC.SC 13G/A Feb 10, 2022⁴⁹
KLA CorporationSC 13G/A Feb 8, 2022 to Feb 10, 2022⁵⁰
MaxLinearSC 13G/A Feb 8, 2022 to Feb 10, 2022⁵¹
CarMaxSC 13G/A Nov 8, 2021⁵²
Descartes Systems GroupSC 13G/A Nov 8, 2021⁵³
JetBlue AirwaysSC 13G/A Nov 8, 2021⁵⁴
NMI Holdings, Inc.SC 13G/A Nov 8, 2021⁵⁵

Sources

The numbers on this page point here. Each one links to the record it came from.

1
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ filings on SEC EDGAR
2
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Southwest Airlines
3
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G on Amentum Holdings, Inc.
4
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G on Booz Allen Hamilton
5
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Flex Ltd.
6
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on GRAIL
7
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on MarketAxess
8
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on American Airlines Group
9
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Elanco
10
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Whirlpool Corporation
11
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Xometry
12
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on LivaNova
13
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Rhythm (United states)
14
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G on GLAUKOS Corp
15
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Nextpower Inc.
16
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on United Airlines
17
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on NetApp
18
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Biogen
19
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Pulmonx Corp
20
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on AECOM
21
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on BioMarin Pharmaceutical
22
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Immunocore
23
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Mattel
24
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Transocean
25
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Xencor Inc
26
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on FedEx
27
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on New Fortress Energy
28
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Raymond James Financial
29
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on Wolfspeed
30
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SCHEDULE 13G/A on KYNTRA BIO, INC.
31
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on BlackBerry
32
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G on Crane NXT, Co.
33
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Splunk Inc.
34
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on indie Semiconductor, Inc.
35
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Arlo Technologies, Inc.
36
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on iRobot
37
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Nektar Therapeutics
38
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Standard BioTools Inc.
39
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Calithera Biosciences, Inc.
40
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on CERUS CORP
41
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Comscore
42
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Stratasys
43
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Wave Life Sciences
44
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on NN INC
45
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Axcelis Technologies
46
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Epizyme, Inc.
47
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on PLANTRONICS INC /CA/
48
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Jacobs Engineering Group
49
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on CONCENTRIX SREV, INC.
50
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on KLA Corporation
51
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on MaxLinear
52
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on CarMax
53
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on Descartes Systems Group
54
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on JetBlue Airways
55
SEC EDGARPRIMECAP MANAGEMENT CO/CA/ SC 13G/A on NMI Holdings, Inc.