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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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  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
Activity composition
2024Q2
  • New positions9 pos$1.07B10.1%
  • Added to97 pos$4.60B43.6%
  • Trimmed187 pos$3.64B34.5%
  • Fully sold12 pos$1.25B11.9%
Buys (NEW+ADD)
$5.67B
Sells (TRIM+SOLD)
$4.89B
Net flow
+$774M

Quarter activity

What changed in 2024Q2 - net new, added, trimmed, exited.
New positions9 names
  • XOMEXXON MOBIL CORP
    +8,514,677
    $980.2M
  • GRALGRAIL INC
    +1,865,276
    $28.7M
  • CASYCASEYS GEN STORES INC
    +63,200
    $24.1M
  • GTLSCHART INDS INC
    +99,300
    $14.3M
  • IBTAIBOTTA INC
    +122,830
    $9.2M
  • USFDUS FOODS HLDG CORP
    +117,099
    $6.2M
  • LICYQLI-CYCLE HOLDINGS CORP
    +410,025
    $2.7M
  • LOARLOAR HOLDINGS INC
    +19,400
    $1.0M
  • NICENICE LTD
    +2,000
    $344K
Added to97 names
  • NVDANVIDIA CORPORATION
    +19,360,045
    $2.39B
  • ILMNILLUMINA INC
    +1,997,010
    $208.4M
  • PYPLPAYPAL HLDGS INC
    +3,184,160
    $184.8M
  • AALAMERICAN AIRLS GROUP INC
    +14,549,310
    $164.8M
  • BIDUBAIDU INC
    +1,753,577
    $151.6M
  • DLTRDOLLAR TREE INC
    +957,275
    $102.2M
  • JPMJPMORGAN CHASE & CO
    +432,619
    $87.5M
  • SYYSYSCO CORP
    +1,192,650
    $85.1M
  • BABAALIBABA GROUP HLDG LTD
    +1,074,175
    $77.3M
  • AAPLAPPLE INC
    +360,000
    $75.8M
  • NFENEW FORTRESS ENERGY INC
    +3,410,630
    $75.0M
  • PFGCPERFORMANCE FOOD GROUP CO
    +1,122,676
    $74.2M
  • + 85 more…
Trimmed187 names
  • LLYLILLY ELI & CO
    −1,636,108
    $1.48B
  • WFCWELLS FARGO CO NEW
    −5,216,519
    $309.8M
  • KLACKLA CORP
    −269,180
    $221.9M
  • NTAPNETAPP INC
    −718,190
    $92.5M
  • MSFTMICROSOFT CORP
    −194,015
    $86.7M
  • ADBEADOBE SYSTEMS INCORPORATED
    −123,931
    $68.8M
  • DFSEURDISCOVER FINL SVCS
    −502,780
    $65.8M
  • TJXTJX COS INC NEW
    −569,881
    $62.7M
  • JJACOBS SOLUTIONS INC
    −364,030
    $50.9M
  • TMOTHERMO FISHER SCIENTIFIC INC
    −90,620
    $50.1M
  • AMGNAMGEN INC
    −154,831
    $48.4M
  • GOOGLALPHABET INC
    −243,310
    $44.3M
  • + 175 more…
Exited12 names
  • PXDEURPIONEER NAT RES CO
    −4,342,556
    $1.14B
  • SWAVUSDSHOCKWAVE MED INC
    −276,770
    $90.1M
  • AMKUSDASSETMARK FINL HLDGS INC
    −275,700
    $9.8M
  • TENBTENABLE HLDGS INC
    −108,900
    $5.4M
  • LICYUSDLI-CYCLE HOLDINGS CORP
    −3,280,200
    $3.4M
  • FRSHFRESHWORKS INC
    −108,500
    $2.0M
  • DRIDARDEN RESTAURANTS INC
    −8,000
    $1.3M
  • SAFESAFEHOLD INC
    −53,600
    $1.1M
  • DOOREURMASONITE INTL CORP
    −7,000
    $920K
  • BEBLOOM ENERGY CORP
    −49,600
    $558K
  • SAVEEURSPIRIT AIRLS INC
    −22,700
    $110K
  • AMLXAMYLYX PHARMACEUTICALS INC
    −10,000
    $28K

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