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Built from publicly disclosed institutional and insider activity. Informational purposes only - not investment advice.OpenStocks · v0.1
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  1. Home/
  2. Super Investors/
  3. PRIMECAP Management
  • Overview
  • Portfolio319
  • Performance8Q
  • Options
  • Activity2.2k
  • News

PRIMECAP Management

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  • Asset Manager · CIK 0000763212
  • Mega-Fund

PRIMECAP Management, an asset manager overseeing $132.11B in disclosed equity holdings (SEC CIK 0000763212). The latest portfolio (2025Q4) discloses 319 positions across 11 sectors, with the largest positions in LLY, MU and GOOGL. On a mark-to-market basis the tracked portfolio has returned 41.7% since 2024Q1. OpenStocks tracks 8 consecutive quarterly snapshots for this manager — every position change, new entry, and exit is logged below.

Track PRIMECAP's filingsView holdings↓
Portfolio
$132.11B
Positions
319
Quarter
2025Q4
Filings tracked
8
Since filing+41.7%Full performance →
Quarter
2025Q42025Q32025Q22025Q12024Q42024Q32024Q22024Q1
Capital flow per quarter
BuysSellsNet
+$10.46B+$5.23B$0-$5.23B-$10.46B'24Q2'24Q3'24Q4'25Q1'25Q2
Latest · 2025Q2
-$4.99B
Lifetime buys
$17.76B
Lifetime sells
$32.35B

Quarter activity

What changed in 2025Q2 - net new, added, trimmed, exited.
New positions13 names
  • COFCAPITAL ONE FINL CORP
    +545,321
    $116.0M
  • GEGENERAL ELECTRIC CO
    +187,700
    $48.3M
  • FICOFAIR ISAAC CORP
    +18,600
    $34.0M
  • AMDADVANCED MICRO DEVICES INC
    +220,700
    $31.3M
  • PCGPG&E CORP
    +600,200
    $8.4M
  • NKTRNEKTAR THERAPEUTICS
    +299,718
    $7.7M
  • GLXYGALAXY DIGITAL INC.
    +290,700
    $6.4M
  • DKSDICKS SPORTING GOODS INC
    +18,450
    $3.6M
  • G8068LSHARKNINJA INC
    +35,600
    $3.5M
  • KOCOCA COLA CO
    +35,200
    $2.5M
  • CAVACAVA GROUP INC
    +26,300
    $2.2M
  • CRCLCIRCLE INTERNET GROUP INC
    +2,700
    $489K
  • + 1 more…
Added to124 names
  • SCHWSCHWAB CHARLES CORP
    +5,032,728
    $459.2M
  • AMZNAMAZON COM INC
    +2,026,408
    $444.6M
  • COPCONOCOPHILLIPS
    +3,135,315
    $281.4M
  • DHRDANAHER CORPORATION
    +1,118,318
    $220.9M
  • G3643JFLUTTER ENTMT PLC
    +764,980
    $218.6M
  • NTRSNORTHERN TR CORP
    +1,270,748
    $161.1M
  • PMPHILIP MORRIS INTL INC
    +784,400
    $142.9M
  • VVISA INC
    +374,263
    $132.9M
  • USFDUS FOODS HLDG CORP
    +1,639,310
    $126.2M
  • BAHBOOZ ALLEN HAMILTON HLDG COR
    +1,207,058
    $125.7M
  • G54950LINDE PLC
    +241,000
    $113.1M
  • TERTERADYNE INC
    +1,125,868
    $101.2M
  • + 112 more…
Trimmed175 names
  • LLYLILLY ELI & CO
    −2,624,862
    $2.05B
  • MUMICRON TECHNOLOGY INC
    −5,814,892
    $716.7M
  • SONYSONY GROUP CORPORATION
    −23,218,035
    $604.4M
  • AMGNAMGEN INC
    −1,756,586
    $490.5M
  • ADBEADOBE SYSTEMS INCORPORATED
    −1,264,055
    $489.0M
  • GOOGALPHABET INC
    −2,419,288
    $429.2M
  • FDXFEDEX CORP
    −1,840,460
    $418.4M
  • KLACKLA CORP
    −396,732
    $355.4M
  • TXNTEXAS INSTRS INC
    −1,657,520
    $344.1M
  • BACBK OF AMERICA CORP
    −7,236,400
    $342.4M
  • WFCWELLS FARGO CO NEW
    −3,724,689
    $298.4M
  • UALUNITED AIRLS HLDGS INC
    −2,964,935
    $236.1M
  • + 163 more…
Exited15 names
  • DFSEURDISCOVER FINL SVCS
    −574,953
    $98.1M
  • LHXL3HARRIS TECHNOLOGIES INC
    −248,000
    $51.9M
  • HONHONEYWELL INTL INC
    −122,350
    $25.9M
  • MGMMGM RESORTS INTERNATIONAL
    −550,370
    $16.3M
  • ODFLOLD DOMINION FREIGHT LINE IN
    −23,000
    $3.8M
  • NKTREURNEKTAR THERAPEUTICS
    −5,354,586
    $3.6M
  • MATXMATSON INC
    −19,250
    $2.5M
  • ETSYETSY INC
    −32,000
    $1.5M
  • FGENEURFIBROGEN INC
    −3,740,820
    $1.2M
  • NNBRNN INC
    −299,200
    $676K
  • DECKDECKERS OUTDOOR CORP
    −5,414
    $605K
  • HTZHERTZ GLOBAL HLDGS INC
    −137,400
    $541K
  • + 3 more…

Recent transactions

Last 20 moves
ADD
A
PRIMECAP Management added to AMZN
AMAZON COM INC
+1,542,950
~$230.82 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed AMGN
AMGEN INC
−802,630
~$327.31 · 2025Q4
2026-02-11
SOLD
O
PRIMECAP Management exited OPTU
ALTICE USA INC
−4,869,860
~$2.41 · 2025Q4
2026-02-11
TRIM
M
PRIMECAP Management trimmed MO
ALTRIA GROUP INC
−47,100
~$57.66 · 2025Q4
2026-02-11
SOLD
A
PRIMECAP Management exited AMH
AMERICAN HOMES 4 RENT
−242,300
~$33.25 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AME
AMETEK INC
+4,000
~$205.31 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to ALLO
ALLOGENE THERAPEUTICS INC
+1,060,532
~$1.37 · 2025Q4
2026-02-11
TRIM
G
PRIMECAP Management trimmed GOOGL
ALPHABET INC
−648,925
~$313.00 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ALB
ALBEMARLE CORP
−450,840
~$141.44 · 2025Q4
2026-02-11
TRIM
B
PRIMECAP Management trimmed BABA
ALIBABA GROUP HLDG LTD
−1,010,730
~$146.58 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed AAL
AMERICAN AIRLS GROUP INC
−639,385
~$15.33 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AMTM
AMENTUM HOLDINGS INC
+208,341
~$29.00 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ABT
ABBOTT LABS
−47,570
~$125.29 · 2025Q4
2026-02-11
ADD
A
PRIMECAP Management added to AMD
ADVANCED MICRO DEVICES INC
+427,689
~$214.16 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ADBE
ADOBE SYSTEMS INCORPORATED
−181,299
~$349.99 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ACM
AECOM
−211,080
~$95.33 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed ALK
ALASKA AIR GROUP INC
−198,579
~$50.30 · 2025Q4
2026-02-11
TRIM
G
PRIMECAP Management trimmed GOOG
ALPHABET INC
−364,306
~$313.80 · 2025Q4
2026-02-11
TRIM
A
PRIMECAP Management trimmed A
AGILENT TECHNOLOGIES INC
−75,270
~$136.07 · 2025Q4
2026-02-11
TRIM
F
PRIMECAP Management trimmed FOLD
AMICUS THERAPEUTICS INC
−78,500
~$14.24 · 2025Q4
2026-02-11