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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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  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
+$6.52B+$3.26B$0-$3.26B-$6.52B'24Q2'24Q3'24Q4
Latest · 2024Q4
-$3.03B
Lifetime buys
$10.27B
Lifetime sells
$15.52B

Quarter activity

What changed in 2024Q4 - net new, added, trimmed, exited.
New positions8 names
  • APPAPPLOVIN CORP
    +348,100
    $112.7M
  • SPOTSPOTIFY TECHNOLOGY S A
    +219,800
    $98.3M
  • EXECHESAPEAKE ENERGY CORP
    +574,518
    $57.2M
  • CVNACARVANA CO
    +174,900
    $35.6M
  • PRMPERIMETER SOLUTIONS INC
    +1,953,126
    $25.0M
  • WMTWALMART INC
    +67,200
    $6.1M
  • TTWOTAKE-TWO INTERACTIVE SOFTWAR
    +17,639
    $3.2M
  • ANETARISTA NETWORKS INC
    +16,800
    $1.9M
Added to54 names
  • SONYSONY GROUP CORPORATION
    +80,724,932
    $1.71B
  • GSKGSK PLC
    +10,407,905
    $352.0M
  • AMZNAMAZON COM INC
    +1,089,100
    $238.9M
  • SCHWSCHWAB CHARLES CORP
    +3,216,000
    $238.0M
  • PANWPALO ALTO NETWORKS INC
    +488,250
    $88.8M
  • DLTRDOLLAR TREE INC
    +947,580
    $71.0M
  • NOCNORFOLK SOUTHN CORP
    +214,700
    $50.4M
  • AALAMERICAN AIRLS GROUP INC
    +2,886,041
    $50.3M
  • CIENCIENA CORP
    +336,180
    $28.5M
  • COPCONOCOPHILLIPS
    +282,990
    $28.1M
  • USFDUS FOODS HLDG CORP
    +371,613
    $25.1M
  • AMTMAMENTUM HOLDINGS INC
    +1,143,097
    $24.0M
  • + 42 more…
Trimmed240 names
  • LLYLILLY ELI & CO
    −933,854
    $720.9M
  • TSLATESLA INC
    −1,162,950
    $469.6M
  • WFCWELLS FARGO CO NEW
    −6,476,780
    $454.9M
  • AMGNAMGEN INC
    −1,253,816
    $326.8M
  • GOOGLALPHABET INC
    −1,683,955
    $318.8M
  • GOOGALPHABET INC
    −1,012,955
    $192.9M
  • Y2573FFLEX LTD
    −4,000,193
    $153.6M
  • NTAPNETAPP INC
    −1,207,067
    $140.1M
  • INTUINTUIT
    −206,161
    $129.6M
  • MSFTMICROSOFT CORP
    −298,375
    $125.8M
  • ACMAECOM
    −1,129,625
    $120.7M
  • V7780TROYAL CARIBBEAN GROUP
    −512,485
    $118.2M
  • + 228 more…
Exited15 names
  • SWN1EURSOUTHWESTERN ENERGY CO
    −7,431,779
    $52.8M
  • L7579LPERIMETER SOLUTIONS SA
    −1,845,691
    $24.8M
  • HLNHALEON PLC
    −548,000
    $5.8M
  • PROPROS HOLDINGS INC
    −254,980
    $4.7M
  • GILGILDAN ACTIVEWEAR INC
    −96,500
    $4.5M
  • RPDRAPID7 INC
    −95,830
    $3.8M
  • MSGEMADISON SQUARE GARDEN ENTMT
    −76,100
    $3.2M
  • ANETEURARISTA NETWORKS INC
    −4,200
    $1.6M
  • LOARLOAR HOLDINGS INC
    −8,380
    $625K
  • G72800PROTHENA CORP PLC
    −35,500
    $594K
  • ADPTADAPTIVE BIOTECHNOLOGIES COR
    −76,030
    $389K
  • FIVEFIVE BELOW INC
    −3,700
    $327K
  • + 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