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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
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  • Activity2.2k
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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
+$5.67B+$2.83B$0-$2.83B-$5.67B'24Q2'24Q3
Latest · 2024Q3
-$3.00B
Lifetime buys
$6.78B
Lifetime sells
$9.00B

Quarter activity

What changed in 2024Q3 - net new, added, trimmed, exited.
New positions7 names
  • AMTMAMENTUM HOLDINGS INC
    +5,271,282
    $170.0M
  • ELFE L F BEAUTY INC
    +320,255
    $34.9M
  • CMACOMERICA INC
    +444,500
    $26.6M
  • BRBRBELLRING BRANDS INC
    +277,391
    $16.8M
  • VSECVSE CORP
    +133,152
    $11.0M
  • K4FONESTREAM INC
    +266,000
    $9.0M
  • SVVSAVERS VALUE VLG INC
    +61,900
    $651K
Added to71 names
  • COPCONOCOPHILLIPS
    +1,418,900
    $149.4M
  • AVGOBROADCOM INC
    +855,207
    $147.5M
  • PYPLPAYPAL HLDGS INC
    +1,069,356
    $83.4M
  • INDIINDIE SEMICONDUCTOR INC
    +9,689,326
    $38.7M
  • PFGCPERFORMANCE FOOD GROUP CO
    +473,050
    $37.1M
  • SYYSYSCO CORP
    +422,954
    $33.0M
  • NFENEW FORTRESS ENERGY INC
    +3,505,975
    $31.9M
  • RYAAYRYANAIR HOLDINGS PLC
    +638,350
    $28.8M
  • G1890LCAPRI HOLDINGS LIMITED
    +515,963
    $21.9M
  • MUMICRON TECHNOLOGY INC
    +206,499
    $21.4M
  • BIDUBAIDU INC
    +176,150
    $18.5M
  • IMCRIMMUNOCORE HLDGS PLC
    +520,950
    $16.2M
  • + 59 more…
Trimmed202 names
  • LLYLILLY ELI & CO
    −1,927,574
    $1.71B
  • WFCWELLS FARGO CO NEW
    −5,186,907
    $293.0M
  • XOMEXXON MOBIL CORP
    −1,430,125
    $167.6M
  • KLACKLA CORP
    −214,170
    $165.9M
  • TXNTEXAS INSTRS INC
    −438,144
    $90.5M
  • MSFTMICROSOFT CORP
    −196,565
    $84.6M
  • EVREVERCORE INC
    −254,030
    $64.4M
  • AMGNAMGEN INC
    −191,186
    $61.6M
  • TMOTHERMO FISHER SCIENTIFIC INC
    −92,060
    $56.9M
  • CATCATERPILLAR INC
    −137,271
    $53.7M
  • ACMAECOM
    −510,706
    $52.7M
  • AZNASTRAZENECA PLC
    −617,190
    $48.1M
  • + 190 more…
Exited3 names
  • LOWLOWES COS INC
    −125,000
    $27.6M
  • OMCLOMNICELL COM
    −110,769
    $3.0M
  • VLTOVERALTO CORP
    −9,667
    $923K

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