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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
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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'24Q2'24Q3'24Q4'25Q1
Latest · 2025Q1
-$4.34B
Lifetime buys
$12.29B
Lifetime sells
$21.89B

Quarter activity

What changed in 2025Q1 - net new, added, trimmed, exited.
New positions12 names
  • G3643JFLUTTER ENTMT PLC
    +952,109
    $210.9M
  • NKENIKE INC
    +1,756,430
    $111.5M
  • G93A5AVIKING HOLDINGS LTD
    +763,800
    $30.4M
  • PSNPARSONS CORP DEL
    +334,800
    $19.8M
  • SNDKSANDISK CORP
    +380,212
    $18.1M
  • SNPSSYNOPSYS INC
    +41,400
    $17.8M
  • FMCFMC CORP
    +231,500
    $9.8M
  • MUSAMURPHY USA INC
    +14,255
    $6.7M
  • BAHBOOZ ALLEN HAMILTON HLDG COR
    +60,000
    $6.3M
  • WELLWELLTOWER INC
    +39,500
    $6.1M
  • CSGPCOSTAR GROUP INC
    +56,500
    $4.5M
  • VVVVALVOLINE INC
    +27,130
    $944K
Added to65 names
  • SCHWSCHWAB CHARLES CORP
    +9,749,728
    $763.2M
  • MDBMONGODB INC
    +780,200
    $136.8M
  • METAMETA PLATFORMS INC
    +172,810
    $99.6M
  • USFDUS FOODS HLDG CORP
    +1,282,379
    $83.9M
  • CMACOMERICA INC
    +1,162,110
    $68.6M
  • AMTMAMENTUM HOLDINGS INC
    +3,647,210
    $66.4M
  • LUVSOUTHWEST AIRLS CO
    +788,255
    $26.5M
  • DHRDANAHER CORPORATION
    +108,600
    $22.3M
  • IMNMIMMUNOME INC
    +3,132,900
    $21.1M
  • SPOTSPOTIFY TECHNOLOGY S A
    +38,015
    $20.9M
  • RVTYPERKINELMER INC
    +193,700
    $20.5M
  • EWEDWARDS LIFESCIENCES CORP
    +256,100
    $18.6M
  • + 53 more…
Trimmed233 names
  • LLYLILLY ELI & CO
    −1,976,884
    $1.63B
  • WFCWELLS FARGO CO NEW
    −3,636,535
    $261.1M
  • RJFRAYMOND JAMES FINL INC
    −1,750,467
    $243.2M
  • KLACKLA CORP
    −307,560
    $209.1M
  • SONYSONY GROUP CORPORATION
    −8,036,380
    $204.0M
  • ORCLORACLE CORP
    −1,379,180
    $192.8M
  • AMGNAMGEN INC
    −613,830
    $191.2M
  • BABAALIBABA GROUP HLDG LTD
    −1,331,410
    $176.1M
  • MSFTMICROSOFT CORP
    −461,650
    $173.3M
  • V7780TROYAL CARIBBEAN GROUP
    −719,890
    $147.9M
  • BBWIBATH & BODY WORKS INC
    −4,185,229
    $126.9M
  • TSLATESLA INC
    −473,525
    $122.7M
  • + 221 more…
Exited6 names
  • ALTREURALTAIR ENGR INC
    −238,363
    $26.0M
  • LVSLAS VEGAS SANDS CORP
    −224,100
    $11.5M
  • RBLXROBLOX CORP
    −50,300
    $2.9M
  • DGDOLLAR GEN CORP NEW
    −32,350
    $2.5M
  • I8RIROBOT CORP
    −303,900
    $2.4M
  • LICYQLI-CYCLE HOLDINGS CORP
    −140,725
    $252K

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